[RCSE] 2.4G lag time reality.
One area that makes this fuzzy is the 2.4Ghz add on module. If the module plugs into the back of what was once a 72Mhz system it will not gain you any lag time advantage. It may actually increase the lag time. As the 2.4Ghz module is reading the pulse stream from the 72Mhz tx and then sending the commands. If the TX is natively transmitting 2.4G and does not have a module then one could expect the lag time to be better. But if you are using a 2.4G module in a 72Mhz Tx then no dice. there is no way for the 2.4G module to know what is happening any faster than the PPM pulses that go to the module. This is the same PPM stream that the RX used to get minus the RF path. and the RF path is instantaneous in comparison to the 20msec pulse rep frequency. RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] Looking for Foam in So Cal...
Does anyone know of a source for Dow Blue Owens Corning Pik foam in southern California? Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] OT Great Movie!
Anyone that creates things with their own hands needs to go see The Worlds Fastest Indian. Its the story of an older man from New Zealand that had a dream to compete in the Bonnavile land speed records. It's the best most up lifting movie I've seen in years. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] OT Great Movie!
At 08:16 PM 2/13/2006 -0500, you wrote: By Indian, they're talking about the motorcycle, no? Yes an Indian motorcycle Paul Breed wrote: Anyone that creates things with their own hands needs to go see The Worlds Fastest Indian. Its the story of an older man from New Zealand that had a dream to compete in the Bonnavile land speed records. It's the best most up lifting movie I've seen in years. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format __ NOD32 1.1407 (20060213) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] FS Bowman Sonic...
I've cleaning out the garage. I have a Bowman sonic kit that I bought about three years ago, it is untouched. (http://www.bowmanshobbies.com/sonic.html) First $30 +Shipping takes it. (I live in San Diego, Shipping will be commercial UPS rates with no markup) PayPal preferred. PLEASE READ: The first time I offered this Plane I got several responses. I offered the plane to the first respondent. I E-Mailed over and over and got no response. So this time If you take more than 24 hours to respond to my E-Mail I will offer it to person #2 etc... Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] dual conversion
Be VERY careful with abbreviations... We have Single conversion We have Dual conversion and there is also a receiver topology called direct conversion. The Radio guys use DC as an abbreviation for direct conversion. As far as I know there are no direct conversion RC receivers, as it takes a significant DSP power to make a direct conversion receiver decode FM. (PCM as used in RC is also a form of FM) Paul (Kl7JG) RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] Tool for Linkage design...
In trying to analyze a wire braced wing (http://www.rasdoc.com/splinter/GuyWire.gif) I found a really neat program that I used to calculate forces. I was not really using it for what it was intended, but it could be really helpful for those that want to do linkage or mechanism design. The tool is called sam 5.0 from http://www.artas.nl/ I wrote up an example of using it to calculate wire stresses... http://www.rasdoc.com/splinter/stress/Streesample.htm If the pictures are too small to read I can upload an improved version, I was trying to minimize bandwidth it's big enough already... Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] Off subject: Help with MS Outlook Express Email Problem?
Dito I Use Eudora and Firefox. E-Mail: I have the free Eudora with the add at home and the paid for Eudora at work. I've had not problems with it at all. Web: I've been using firefox for about 6 months. I use if for most things, every once in awhile I find a web page that is broken when using Firefox and have to fire up Microsoft Internet exploder. This only happens about twice a month. RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] FS Bowman Sonic...
I'm cleaning out the garage. I have a Bowman sonic kit that I bought about three years ago, it is untouched. (http://www.bowmanshobbies.com/sonic.html) First $30 +Shipping takes it. (I live in San Diego, Shipping will be commercial UPS rates with no markup) PayPal preferred. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] FS Bowman Sonic...
It is sold Damm that was fast. Some of you may have gotten hung up on my spam filter. To be fair I went through my logs and selected the E-Mail that had the earliest time stamp. Paul At 09:17 PM 2/16/2005 -0800, you wrote: I'm cleaning out the garage. I have a Bowman sonic kit that I bought about three years ago, it is untouched. (http://www.bowmanshobbies.com/sonic.html) First $30 +Shipping takes it. (I live in San Diego, Shipping will be commercial UPS rates with no markup) PayPal preferred. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] Sold... Bowman Sonic...
It's gone RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] More Airfoil questions...
In my search for a higher lift airfoil I'm looking at the DAE-51 I will be using it at a CL of around 1 At High CL it strikes me that the laminar flow (if any) would be on the bottom surface. The wing is going to be built up with a wide rib spacing for Solar Cells. Would I find any benefit from making the bottom surface either foam, or thin balsa sheeting to maximize the bottom surface accuracy? This adds weight, but will it help efficiency? Once again I ask the hard question, I know it will be better, but any hint as to how much better? Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] Higher Lift Airfoils...
I'm still fussing with my solar wing. I've 95% answered my Planform questions, now it is on to airfoils. The Airfoil I flew in 2004 was an airfoil Mark Drela designed for me about 5 years ago. My request to him was a low pitching moment airfoil with flat spots on it to put the solar cells. Since then I've changed solar cells (50% more efficent) and they no longer fit the flat spots. I've also come to the conclusion that as built with a very light trailing edge it is not holding shape well enough to really be low pitching moment. So I'm searching for an airfoil Re will be around 170K 1)I want to minimize sink/maximize climb. This means optimizing (Cl^1.5)/Cd (I think this is the element to maximize) 2)I'd like to minimize pitching moment to reduce wing structure. 3)The wing will be built up I realize that #1 and #2 are some what counter to each other In playing with things in profili I've found nothing that beats the clark-Y for maximizing requirement #1 I know there are much newer airfoils, and it's a bit off topic for a soaring group, but this seems to be where the brains hang out... Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] The perfect platform or Not....
Wing design is very complex. Folks make careers out of doing it. I hadn't noticed ;-) I'd suggest getting a copy of a spreadsheet written by John Hazel called something like Liftroll. It's a good way to play with the basic aspects and make reasonable choices of span, twist and chord. The basic principles are consistent local Cl's across the span with an elliptical distribution of lift across the span to minimize induced drag. I've played with LiftRoll, but a couple of things escape me I can adjust the planform twist to get eliptical lift distribution at one AOA It is then off at a different AOA. (as expected for a rectangular platform) So how do I convert this non-eliptical lift distribution to a drag number for comparison. I can use LiftRoll to adjust twist to make it look like an elipse or not, but how do I generate the comparison number from my origional post, IE wing 1 will have min sink of 1 fps and wing 2 will have minimum sink of X fps? Paul In General: Min sink is when (Cl ^(2/3) /Cd) is maximized. How do I use LiftRoll to get a wing Cd, Cl given a polar Cl, Cd? In LiftRoll is av/mx Cl the Cl I want to optimize for? How do I go about guessing an AOA? (Again from the airfoil polar? ) If you can't find John's spreadsheet, I can forward either the simpler earlier version or a more involved later version. If I can figure out how, I could just put it on my website. Bill Swingle Janesville, CA RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] The perfect platform or Not....
As for a web page bits and pieces at different times... The most current page is: http://www.rasdoc.com/splinter/solar2004.htm The collection of related pages (Many Many really outdated) http://www.rasdoc.com/splinter At 01:32 PM 2/8/2005, you wrote: I can use LiftRoll to adjust twist to make it look like an elipse or not, but how do I generate the comparison number from my origional post, IE wing 1 will have min sink of 1 fps and wing 2 will have minimum sink of X fps? You don't necessarily want an elliptical lift distribution in a real-world model, since that might result in turning behaviour that is a little scary at times if your airfoil selections aren't correct. You're really looking to optimize cruise here, right? (ie min power setting for level flight). Look into the power factor calculation available from xfoil/profili. Flight power is proportional to CD/CL^1.5, but remember that CD is the total airframe drag coefficient, so working with the airfoil Cd along isn't going to give you the full picture. How do I use LiftRoll to get a wing Cd, Cl given a polar Cl, Cd? Very simple...you can't. It's not designed to be able to give you this information, since at no point does it incorporate actual airfoil data. In LiftRoll is av/mx Cl the Cl I want to optimize for? That's a planform efficiency number, giving you a measure of how aggressive the planform design is. Real-world meaning: a high efficiency number will require a more competent pilot, since upon reaching stall more of the wing will let go at the same time. Compromising this measure will result in a model that's easier to fly over a wide range of conditions. How do I go about guessing an AOA? (Again from the airfoil polar? ) Don't bother...I've already made a sheet that will calculate it for you (overall Cd, wing drag, tail drag etc). You need to know the weight of the model (assuming you're calculating a level flight condition, ie weight=lift required) and you need access to the airfoil polar data from Profili/Xfoil at the appropriate Re# Go to the following link to download the sheet...based off of LiftRoll about 3 yrs ago: http://www.soarcalgary.com/Extras/Articles/Sailplane%20Design%20Spreadsh eet/ Did you have a webpage for your solar project? I've been curious how it was coming along, but the few searches I ran never came up with the webpage that I seem to remember seeing once upon a time. Hope that helps, Adam Adam Till Mechanical Engineer 403-270-9200 (ext 154) 403-270-0399 (Fax) UMA Engineering Ltd. 2540 Kensington Road NW Calgary AB, Canada T2N 3S3 RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] Better Cutting Ribs CNC style....
After much feedback I bough a new 2 flute cutter and tried again. The ribs are much better with no sanding needed. This is shown as an added last picture on the web page:http://www.rasdoc.com/splinter/RibsCut.htm or you can see it directly at:http://www.rasdoc.com/splinter/RibImages/image036.jpg One person said that it looked complicated for one rib. As a matter of record I created, cad modified, and cut 2 each of 12 different ribs in about 90 minutes. That's less than 4 min a rib and I could make a second identical set in half that time. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] The perfect platform or Not....
I've asked around this question in the past, but the answers or my brain have all missed the mark a little bit... So I'll be more specific: Given two wings, same span, same area, same weights 1)A a square tip wing aspect ratio of 12 10 degrees simple dihedral. Twist optimized for a single most efficient point 2)A perfect elliptical wing with perfect elliptical lift distribution aspect ratio 12 10 degrees simple dihedral, or simple polyhedral with a flat center. Twist optimized for a single most efficient point I want to optimize minimum sink (climb actually but minimum sink is a good stand in) If wing 1 sinks at 1 ft/sec Will wing 2 sink at .95 or .5 or The tradeoff I'm trying (presently unsuccessfully) to weigh is for my solar plane, a non square wing really ads to the complexity of the power conversion and cell packing density. I can exactly quantify how much weight and power a non square wing costs me. What I can't currently quantify is the loss of efficiency for a well designed square wing. (McCready's Pathfinder/helios were square so I can't be too far off ;) RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] Cutting Ribs CNC style....
I've been cutting some balsa with a small Taig CNC mill I did a brief writeup. http://www.rasdoc.com/splinter/RibsCut.htm RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] Cutting Ribs CNC style....
How do you hold your material off the table so that the tool doesn't cut the table? That is what I made the bottom Aluminum plate for, to be sacrificial. It does cut my holding fixture. by about 0.005. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] Tailboom deflection..
I'm in the process of rebuilding my Solar plane and I want to do some ground based static tests before I risk another infight structural failure. The failure was caused by one of two possibilities. 1)The Spar in the H-Stab failed at speed. 2)The Tail boom was too flexible leading to a tuck runaway followed by failure of the the H-Stab. I'm rebuilding using the HT21 airfoil for the H-Stab. My design VNE speed is 50 mph. My Hstab is 36 span, 4 tip and 7 root chord. How much force can this airfoil generate at 50MPH? (To static test the spar) How much tail boom deflection at this force is acceptable? I'd like to static test both parameters before I risk another failure. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] All flying vertical stab...
What are the issues with an all flying vertical stab? I'm building the new tail for my solar plane and I'm thinking I'll make a Drela style carbon V mount for the vstab. In trying to make everything light and survivable It looks like I can make an all flying vertical stab lighter than a normal rudder. My Thoughts: I can build a one piece foil lighter than a two piece foil even with a tape hinge. The Plane is Rudder Elevator and has heavy wings thus I don't really want much adverse roll from the rudder. This makes me want to build a vertical stab that is both above and below the boom. To survive landing/ground contact the part below the boom has to be heavy/sturdy. If I make the vstab all flying then I can make it pivot around a single bolt on the all flying mount, thus it piviots out of the way rather than absorbing landing loads. Does this make sense or am I way off base for some reason I don't understand? Any airfoil suggestions? (Currently looking at a thickened HT08 Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Re: [RCSE] All flying vertical stab...
Putting the rudder on a V-mount works fine, except striking the rudder on the ground may cause it to break. I suppose you could have the V-mounted rudder mostly above the boom, which would minimize the torques on the V-mount from a ground strike. But rudder airloads will torque the boom more. My thought was that the rudder strikes on landing would most likely be from straight ahead. If the rudder was attached with a single bolt then it should pivot around that bolt, and not transmit much load to anything? The Flight loads wanting to rotate the rudder fore and aft in the vertical plane should be almost zero if the mount is in the rudder center??? I realize that the rotating prop puts some diferential airflow into the equation but I wouldn;t think it was that much Am I missing something? Then there's the agony of deciding whether to put the rudder on the right side or the left side of the boom... I'm currently living in The Peoples Republic of California, so it's got to go on the Left side ;-) RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] Proof there are people crazier than I....
http://www.ornithopter.net/MediaGallery/Videos/index_e.html RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] Stab Spar Sizing...
The Hstab spar failed on my Solar Glider, It was probably a combination of tail boom flex tuck and actual spar failure. The spar was laminated Spruce, balsa spruce. See:http://www.rasdoc.com/splinter/solar2004.htmhttp://www.rasdoc.com/splinter/solar2004.htm I'm thinking that the new Hstab will have a CF spar caps with balsa core. The Tail airfoil for the new Hstab will be Mark Drella's HT21 The design VNE of the airframe is 50mph. (It's slow) The old Hstab had a root chord of 7 a tip chord of 3.5 and a span of 36 Any suggestions for spar sizing? I'd like a safety factor of 1.5 or so, I'm willing to build multiple sets and static test things to destruction to shave off every gram. On this model tail weight is everything! The solar panels make the wing CG aft of the desired CG and with no batteries the only counter weight is the power conversion electronics and the motor. Every gram in the tail is two grams in the lead spinner. So I'll taper in 3D and do whatever is necessary to reduce weight. I was also thinking about making built up ribs, so any weight saving thoughts on this would be helpful. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] Wing Design Help...
As I posted a month or so ago I'm working on my solar powered plane. http://www.rasdoc.com/splinter/solar2004.htm In the past I was restricted to a Hershey Bar wing shape to keep the number of cells in each row the same. Now I am running the individual rows of solar cells into separate power point trackers, thus I can vary the wing shape. Several rules I need to keep the wing area the same I'd prefer not to change the root chord very much, but I could add some taper at the tips... something like going from three rows of cells to two rows to one tapering either the leading or trailing edge. Realize that the cells have to stay square, I can't taper them so the transitions will need to some what abrupt, I also can't waste much wing area for unused space with no cells as I'm right up on the FAI area limit and every square cm without cell is wasted power. I'm not out to maximize L/D, but minimum sink( Actually maximum climb, but close enough to min sink). In the past I've also used an airfoil with a low pitching moment to minimize structural mass. Any thoughts or suggestions as I start to prepare for next springs effort. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] Solar Power Conversion...
Several members on this list privately asked me for more information on my solar plane. One afternoon I had the wild idea to submit my solar power conversion circuit to a Circuit AVR contest. I was rushed and only had about one day to try and throw the bits together. The Presentation Quality is suspect, but maybe some useful information can be had. Beware the zip file is large, 8M , you probably want to start with the contained doc file. http://www.rasdoc.com/splinter/EntryA3691.zip Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] Solar Flight report...
From Time to time I post info on my solar powered RC plane here. Today it flew very well and is also a total loss http://www.rasdoc.com/splinter/solar2004.htm As I start planning for my 2005 version I want to upgrade the strength of my H-Stab. I believe that todays failure was due to the failure of my built up stab. Anyone know of a source that would glass a set of cores for me? (This needs to be world class light) Basic Specs: Airframe is at the maximum FAI limit 1.5 sq Meters combined wing and hstab area. Span is 14 feet. ~90W of power today. 130+ watts in clear sun. Total wt about 2.5 Kg Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] Need AMA CD to help with records.
I've built a Solar powered RC plane. (See:) Airplane: http://www.rasdoc.com/splinter/DCP01224.JPG Launch: http://www.rasdoc.com/splinter/DCP01221.JPG Proof it stays up... http://www.rasdoc.com/splinter/ItFlies.JPG It was built with the express intent to set some FAI world records. I am specifically interested in setting the following three records: N186 Distance in a straight line. (Currently 48.21km or 29.94 mi) N187 Gain in Altitude. (Currently 2065M or 6773 ft ) N188Goal and Return. (Not yet Set) The aircraft I built is also capable of setting the following records for electric aircraft with a combination of sources of current. N193 Distance in a straight line. N194 Gain in altitude N195 Goal and Return (Not yet Set) I currently live in San Diego and I need help finding an AMA CD that would be willing to work with me in Southern CA, or in AZ? I would preferably like to contact someone that is familiar with he record setting process. I've read the FAI checklist and i have both my AMA and FAI sporting cards/licenses. The airframe is ready today for the distance records, and I'm planning on testing the telemetry and higher power HAM transmitter needed to set the altitude record this weekend. Any help or pointers you can provide would be very welcome. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] Tail volume coefficient....
A few years ago, someone gave me a real clear answer on how to size the tail on a RES floater type plane with dihedral. I believe that the calculations were titled tail volume coefficient It went something like: Vertical Stabilizer+Rudder area * moment arm (from CG ?) / (wing area* span) == some range Same basic formula for Horizontal stabilizer and elevator only it did not account for span just wing area There were subtle differences between the two formulas Could someone please re-enlighten me? Specifically I'd like to know: Formula for Horizontal Stabilizer coefficient. Formula to Vertical stabilizer coefficent. Reasonable range(s) for a slow floater type aircraft. Thanks in advance. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] GPS system was The X-C boys out west are doing just that.
Do you think a GPS system could be developed that would be able to download data that would let you see the flight in 3D? That would be too cool!!! Yes if the market was there, one can buy small GPS units that are about the size of a large postage stamp with a weight of ~8grams. Add an antenna ~8 gms and a small battery and one could have a system good for several hours the size of a mini servo. This is purely a question of market size, If one were to sell only 1 unit, it would cost 10K+, if one sold 10K units then it would be about $150.00 To give you an example: The 8gm GPS is made by uBlox, it has an internal CPU that is idle 40% of the time, so it has more than enough CPU horsepower to log all of the flight data, the caveat being that the software development kit that allows you to download your own custom code to the ublox receiver is $5000 (this was the price 18 months ago when I last checked) Next Item to consider: without local correction GPS altitude is not so accurate, +/- 50m and barometric pressure has al sorts of problems with a good static reference port that is not effected by airspeed. The GPS can be made much more accurate, (+/-10cm) , but this requires more equipment a ground station that records the current atmospheric distortions of the GPS signals, and a more capable receiver in the plane. One can do amazing things with the technology, it is simply a problem of wether or not the market would support such efforts. Using the similar (slightly larger) technology I built a small unit the size of a computer mouse to put in my teenagers car.. The whole purpose of the device: Friend: How fast is this car.. Son: I can't show you, my Dad is an AS***OLE and put this tracking device in that records when I speed. I don't even need to look at the data, it's just there as a reminder that Dad is watching and as a outlet to avoid peer pressure. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
RE: [RCSE] Just a Flying Contest.reply -
I like the idea of calculating the area enclosed and scoring on the amount of area covered. This would be a mini cross country. Paul At 01:53 PM 8/13/2002 -0400, you wrote: how much for the image sans servos?? but more importantly, I just mentioned 2M from the standpoint of getting people into FLYING not competing, not spending 500 for an organic minus servos, etc - just putting someone on the sticks of a Gentle Lady, maybe a poly electric just something that would be fun and affordable for (fill in the blank, I was thinking kids / new fliers) as far as contests, the sky SHOULD* be the limit, so to speak. : ) Brent * unless you want to just group planes / fliers by money spent, not size or age Look at hand launch. You can hardly call that affordable. The same will happen to 2M if it is ever revived, G.. forbid! RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Just a Flying Contest
GPS could be used to do total energy, as it has both ground speed and altitude. (I know wind contribution to airspeed is lost) The real danger to this format is that any quest for maximum altitude will result in pilots flying to altitudes that are unsafe. Unsafe, because they are too far away. Unsafe because you are high enough to interfere with regular full size air traffic. Unsafe because one would want to maximize the dive back down speed, high speed missiles loosing their wings and impacting randomly around the pits would be very bad. With GPS one could add some additional tasks to make the event more challenging. Limit the boundary that you can fly in. Make it altitude gain from the 1st minute of flight, this would eliminate the whole zoom launch, gorilla tow motor problem. Add some precision. Pilots put in bids, I can gain 5Kft in 10 minutes, Hitting within 5% of your bid is worth something, this would add the skill of predicting the performance given the conditions before flying. Lots of possibilities... Paul At 01:01 PM 8/12/2002 -0400, you wrote: Interesting discussion. Although some type of electronic measurement of in flight performance might become a contest of the future I'm not so sure that problems with existing formats can or should be solved that way. If the tight scoring in F3J is a problems perhaps FAI should simply impose a wing span limit on the planes. I submit that this would be relatively simple to implement and leaves all the other elements of F3J intact. If the wing span were limited to, say, 2 meters the flying skill required to max the rounds would certainly be increased and spread the scores accordingly. A 2.5 meter limit would probably do as well. Just another thought. Rick At 09:40 AM 8/12/02 -0700, tony estep wrote: --- James V. Bacus [EMAIL PROTECTED] wrote: Just a flying contest... I think about this quite a bit. When electronic loggers and telemetry become readily affordable, (which we are on the threshold of now), maybe there could be a format that emphasized flying alone with each contestant having a logging device onboard. I'll bet that some form of Jim's idea becomes the contest of the future. For the price of a winch/retriever, a club can buy a few ALTis or LoLos. Maybe soon there'll be a micro-GPS unit (I have a Garmin Vista, which is cool, but it's not practical for this use). That would open up even more possibilities. Anyway, it's obvious that the present F3J format, for example, will have to be changed. Planes are on the towline for 5 seconds, they max whatever time is required, and then get 95 or 100 landing points. The field is bunched so that the 5th place flyer has 99.7% of the winner's score. The WC may well be decided by a slow or quick punch of a timer's button. Fiddling with target times, relative importance of landings, and launch mechanisms won't change the fundamental issue. Adding speed, as Daryl slyly suggests, would turn F3J into F3B. Jim's suggestion is, in my mind, the one that could promise to spread out the field, clearly identifying superior flying. So what's the task? A pure calculation of cumulative altitude gained creates a need for energy compensation, which complicates matters quite a bit. How about this: a 10-minute task, with points for duration and additional points for the maximum altitude gained during any 180 seconds during the flight. Altitude gained over any 3-minute window would be less subject to fiddling. If you found strong lift, you could dive, zoom back up, then circle and climb. Sure, an uncompensated vario would credit you with the zoom. But only the first one would count, since your gain would be from the bottom of that dive to the window's end 3 minutes later. And there would be lots of tactical decision-making involved in such a task. Think about the many dilemmas that would face the pilot -- it's quite interesting! Anyway, we need good new ideas for a contest format. Cool techno gimmicks are present everywhere in this sport -- why have our championships determined by a thumb-operated stop watch, and a ruler? __ Do You Yahoo!? HotJobs - Search Thousands of New Jobs http://www.hotjobs.com RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] Glider performance at extrem high altitude.
John Ellias published some really good performance data for the RNR SB-XC ttp://www.xcsoaring.com/xcsoaring/articles/sbxctest.htm How would this performance change at extreme high altitude? 30,000ft, 60,000 ft etc It is my understanding that the indicated Air speed would remain constant, but true air speed would increase. Would the minimum sink speed scale by the same factor? Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] A Nice game....
I use eudora, and avoid all of the outlook express virus problems. In addition it seems to be a more robust E-Mail program than outlook express. The eudora version I use at work has 3 Gb of archived mail and it works just fine! Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Re: Built-up Balsa slope kits?
The Sig Nija is a good choice, but reenforce the fues behind the wing. If you don't I guarantee it will break there. I also like the Dynaflight Talon a fully built up ship and thus a bit fragile, but a Fun ship. I just moved back to San Diego after a 10 year absence, and I am almost done building a new talon to play with on the local slopes. I hope to finish it over the long weekend. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Flight 587 and R/C Models
20 years ago I worked as an aircraft Mechanic. It was hard to feel completely comfortable when inspecting Aluminum structures. When an Al structure started to have problems(corrosion etc..) one could visually see signs of problems long before they were structurally significant. I just don't see how composite structures can be treated the same way. The structure can fail from the inside out, and performing sophisticated inspections on parts that look fine will take some real paperwork discipline. This particular aircraft (According to news reports) had: 1)A previous hard landing. 2)A previous repair to the V-Stab mounting point. In hind sight both things should have caused increased monitoring of these components. Increased monitoring is easy when it means look at the part with a flashlight or some spray on crack finder, but it's a harder thing when it means, ultrasonic, x-ray or other specialized inspections requiring removal of the V-Stab. The Aerospace industry has seen composite construction as a big win in terms of production flexibility and and weight reduction. It will take time to see if the increased inspection costs associated with composite construction will become an issue now. Paul RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] For Sale NIB Sailaire....
I have a NIB Sailaire kit. make an offer I'll let the highest bidder know the result in two days. Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] My first molded part....
I'm trying to make an all Carbon all flying stabilizer mount like Mark Drella's: http://www.charlesriverrc.org/articles/allegrolite2m/vmount.pdf Since I have not done much of this before I have some newbe questions. When you build a part like the V shaped support, 1)Do you have to mold it to final dimensions, or can you trim the part to dimension after it cures? 2)If you can trim it to final dimensions, does the vibration of some thing like a dremel tool cause delamination or weakness? 3)After my part comes out of my simple mold can I add the reenforcing tow as a second step? 4)If I am molding in multiple steps what precautions should I take to insure that I get a good bond in the secondary steps? 5)What do you use for mold release? Where do you get it? 6)If I don't need a perfect finish can a use a cheaper/easier to get mold release like Parafin wax or car wax, vaseline? ? RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Electric Prop question....
I know this is not a soaring question, but many of you silent flyers also fly electric ;-) Does anyone make an in flight adjustable prop for a small geared electric? Does anyone make a ground adjustable prop? Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] First Flight Report/Problems..
My Soon to be Solar airplane had its first flight today without cells. It was a good news /bad news flight Good news... It has plenty of power and the pitch trim stability seemed to be good. Bad news... It has a spiral stability problem. It was a bumpy strong thermal day and it got upset and entered whatlooked like a classic case of the death spiral With full opposite rudder the spiral just got steeper until it hit the ground. With such a slow aircraft this all happened in slow motion. It was in the CSRC long grass so the only damage was one wing tip. It is easily repairable. Now to speculate on why this happened. It is a Rudder Elevator bird with no Ailerons 1)I believe that I do not have enough Dihedral by a factor of two. It was recommended that I have at least 10 degrees. I read this as ten degrees total angle at the wing root, 5 degrees on both sides. The general consensus on the flying field is that 10 degrees refers to both wings, and the total angle at the center section should be 20 degrees. Should it be 10 total or 10 each side? 2)The vertical stabilizer fails the "that looks about right" test by looking to be too large. Since I have a large moment of inertia I was targeting the vertical tail volume of 0.025 to 0.030 The calculated Vv of the plane as flown is 0.030 21" span * 10" cord on 44" arm aft of a 14" cord wing with 178 in span. (The 10" cord includes 4" of rudder and 6" of stab) Vv = A_vert * arm_vert / A_wing * span Vv= ((21*10)*44)/(14*148*148) =0.030 Is this too much v stab? With the fairly long AR stab, full rudder seems like it would induce a rolling moment, the wrong way. The way it is made it would be trivial to reduce the span by 2.5" to 18.5" Vv=0.0265 or to 16" Vv=0.0229 Should I do this? Thanks in advance for any help Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] My Servo City experience....
As Servo City is a new vendor I did not want to complain. I like to see vendors in this hobby succeed. So I asked the group for experiences , and every one has had exactly the same experience. Promises, promises no servos I placed an order on the 5th asking for next day air shipping. The said they would ship that day. On the 6th I called to get a tracking number... they said there had been an error and the package would go out on the 6th if they could get to the drop off in time. (I called late) So I gave them the benefit of the doubt, and expected them on the 8th. (As I asked for Express Mail next day, the 8th Saturday would still be a delivery day) but as of Monday the 10th I still have no servos. Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] ServoCity Important Update.....
My Servos arrived today. The only misunderstanding was that they were sent Priority Mail, not Express Mail Next Day. Arrived as I ordered them, but shipped 1 day late. (As they indicated) Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Foam Cutting Questions....
There are lots of plans and descriptions on the web for wing cutters. There does not seem to be much info on basic foam preperation. 1)How do you square up the foam to make wing blanks? 2)Do you cut Dihedral angle before or after cutting the Airfoil? 3)What do you use for template material? Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] hot wire power supply???
Do you have an Astroflight Charger? My 110D will go into test mode if you hold the button down on power up. Then you can just dial in the precise current you want. It makes a great safe adjustable how wire supply. Paul At 08:25 PM 6/14/00 -0400, you wrote: I am building a hot wire set up and need to know which is better: 1. a variac (3-5amp) connected to an isolated step down transformer 110-24 volts 10 amp or 2. same isolated transformer with a dimmer switch on the 110 side. If neither, then what is the best way to do it?? I want plenty of power to be able to cut anything from a 20 in to a 75 in bow. Please include any and all assistance in the construction of the power supply that can be offered. I am looking both for an inexpensive and durable setup THAT IS SAFE to operate. Any comments withh be helpful. I am also looking for suppliers of the required parts. Radio Shack does have the above transformer but it is ~$55. The more I save the more I will have to spend on foam and new sailplanes etc. Thanks Frank RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Mylar film covering.....
I have a small Electric A/C covered with mylar film. The Clear covering over balsa frame looks way cool. But Clear is hard to stay oriented. Can I lightly spray paint some stripes over mylar covering? Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Question ....
ROFLAG rolling on floor laughing at Gordy Since that one get used soo much it should be shorter LAG Laughing at Gordy RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Trainer Cord / EZagi....
I had an E-Zagi with an Astro brushless 020 I used a little heavier Strapping tape and had no flutter problems. My son however drilled it into the ground at extremely high speed.. I've ordered a new E-Zagi and an onboard mixer, so I can use my dumb trainer box with the new one. Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Simulator....oops...
I've been playing with the new RealFlight simulator. It doesn't do gliders, but the Aircraft simulation is absolutely first rate. The company that makes the simulator has added Helicopters and Cars to it's simulation line up, so they are open to adding new capabilities. They have an E-Mail address: [EMAIL PROTECTED] Send your requests for a good slope and/or thermal simulator. If they did a glider simulator of the same quality as the flight simulator it would be an awesome thing. Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Sailaire Help....
Could anyone Photo copy a set of Sailarie instructions and send them to me? Dream catcher Hobby sent me an electronic copy. Great service. Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] 50 MHz.
At 08:27 PM 4/8/2000 -0400, you wrote: I'm looking for a fairly inexpensive receiver on 50 MHz. It only needs to be 4 channel. So far my search has been unsuccessful. Who makes one and who sells one? I have a 50Mhz FMA. Paul (Kl7JG) Thanks in advance. Randy Bullard [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Building surface....
I'm in the process of reorganizing my Garage. (It has not had a car in for 7 years) I want to upgrade my building table to a full 8' long. Any suggestions on how to make a flat 8' x2'table? Any suggestions on the best surface material? What do people use for building boards? Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Movie with David Carridene and Suzie Gilstrap????
I recall a movie about David Carridene and a Pitts, but no handicapped girl"Sky Dancer." The movie ends with Carridene being chased by a drug dealers in a P-51 trying to shoot down his Pitts. I thought that one was named Cloud Dancer RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] My Telemetry system.....
For any one that is interested I'm making progress on my telemetry system... See: http://www.rasdoc.com/splinter/brain.html Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Small GPS was Re:Telemetry system.....
http://www.mtl.marconi.ca/Docs/CMC/Components/superstar.html That one is huge! ;-) For small try: http://www.u-blox.ch/gps-ms1/ or if you want to include an antenna... http://www.pharosgps.com/product/igps180.pdf This is what I've chosen to use... http://www.ashtech.com/Pages/prodoem.html look at the G8. (I have one and it outputs RAW data so I can post process to ~1m accuracy.) Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] 2 planes one radio
I hear the stylus is a great radio but can it really broadcast on 2 frequencies at the same time. Their has got to be some AMA/FCC rule against that. Transmitter transmits on one frequency. Both air craft are tuned to that same frequency. Left Stick goes to Ch 1,2 Right Stick goes to Ch 3,4 So plane1 uses Ch 1,2 So plane 2 uses Ch 3,4 One Radio, one Freq... one weird experiment. Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Re:WRAM Show
How big is the WRAM show? I live north of Boston. I've contemplated driving down to see it. Is it worth the trip? If you were going to attend one RC show a year what show would it be? Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Small airspeed indicators?
I'm working on a data recording system: Altitude. Pitot Airspeed. 2 axis Acceleration. Temperature RX battery voltage. RX signal quality. (How many cycles have been missed) GPS position Compass heading. The system will telemeter the data to the ground using a small Amateur Radio on 70cm or 440 Mhz. (2 Meters is also possible) The overall dimension for the complete system will be 3.7" x 2.2 " x 1.1" and 170gm. All of these weights/sizes do not include the battery, 6.0 V at 200ma. A lot less battery is needed if you don't need the GPS. I'm developing the system for my own use. If there was enough interest (10 people) I might be persuaded to build and sell the systems. The realistic selling price for the complete system would be about $1K, not including the Laptop on the ground side . Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Foam properties....
Where can one find the properties of different foam core materials? Is the quality of 'Blue' Foam purchased at Home Depot the same as 'Blue' foam purchased from a composite material supplier? Where can I find the Approximate: Tensile strength: Shear strength: Compressive strength: Density: for White Blue Pink Spyder EPP Other? RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Platform question.
I understand that an elliptical platform is most efficient. I also realize that this is less noticeable with higher aspect ratios. Is there a formula that will express this inefficiency? If I have a 14:1 aspect ratio, how much worse is a constant cord wing than an elliptical wing? A Double taper? Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Sailaire Improvements....
Before I begin my winter building project, I thought I'd ask the list for any suggested improvements or modifications. Any thoughts on what one should do to improve on a sailaire? Paul P.S. I've already heard that you should shout "Pigs in space" when you launch the thing. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Re:Mars Lander Important!
We are tending to try to do more science with less funding. I wonder how smart that is? The weak link in the system may be the political one. I personally am completely behind you folks - As a matter of fact, I would like to see your budget expanded (maybe this would not have happened otherwise!). I just finished sending Snail-Mail letters to my congressman and my senators asking them to give NASA more $$ for this kind of exploration. If you guys really want to support NASA put down your trannsmitter / x-acto knife and write a letter! Paul P.S. At the planetfest Aeroenvironment had a cool RC glider that is designed to be droped on mars. IT Unfolds and then glides for 20 min. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Any good design software....
Can anyone recomend : 1)A good airfoil plotting/analysis program? 2)A Good inexpensive CAD program for creating RC aircraft plans? 3)A good performance prediction programs / spreadsheets? 4)Good Electric power calculators? Please E-Mail responses to me directly and I will do a summary for the group. Thanks in advance. Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
