Re: [RCSE] Eraser Ballast
No, the lathe just makes the job easier if you want to make ballast in significant quantity. Here is a simpler way to make slugs : 1) Getting a metal tube of outer diameter that fits the ballast tube. 2) Epoxy a metal plate to one end to seal it off. Make sure that it¡¦s a tight seal. 3) Submerge the tube into water with the open end pointing upward and above the water. 4) Pour lead into the tube. 5) After it has cooled off, saw the lead-filled tube into segments of appropriate length. There are many alternatives. If you don¡¦t like sawing and filing metal, a neater way is to first cut the metal tube into segments with a tube cutter, glue all the segments onto a big metal plate and fill them up with lead one by one. Use as little epoxy as possible so that you can break the slugs off the metal plate easily. Hope it helps, Y C Lui --- In [EMAIL PROTECTED], Joe Parsons [EMAIL PROTECTED] wrote: At 09:40 AM 4/13/2004, you wrote: Hi Joe, Pls see if this is useful: http://yclui.rchomepage.com/making_ballast/making_ballast.htm Those are beautiful! Now all I need to do is buy a lathe, learn how to use it... Joe Parsons I have also made these ballast rods for my Elita which has got only one ballast tube : http://yclui.rchomepage.com/Misc/elita_ballast.jpg. These rods are metal tubes with lead slugs glued inside. The slugs are positioned to keep the CG of the model unchanged after adding ballast. Y C Lui --- In [EMAIL PROTECTED], Joe Parsons [EMAIL PROTECTED] wrote: I have an Eraser 2000 (single ballast tube). I'd like to add ballast. Where can I find information about doing this? Joe Parsons 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-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] Multiplex wing servo - has anyone tried ?
Looks weird, expensive too but is it good ? http://www.multiplex-rc.de/hp/produkte/images/006538601.jpg 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] Programming Help
I think the problem with the JR 8103 is after you have chosen the dual flap wing type for gliders, the retract channel (#5) will be seen by the transmitter as the control for one of the ailerons ( can't remember left or right ), rendering the retract switch unusable. I have the same requirement for my electric gliders but I couldn't achieve it with my JR 9X. Finally, I have to settle with controlling the motor with one of the sliders at the side of the transmitter. Y C Lui --- In [EMAIL PROTECTED], [EMAIL PROTECTED] wrote: Is there some special problem with the JR that's different from other radios? I use a Futaba 7 with the motor on the retract channel (5), and it's fairly straightforward. It did need a bit of tuning, because I found that on the Futaba, the travel on channel 5 is much greater than the other channels, based on checking servo rotation. 100% ATV seemed to confuse the ESC (Phoenix 80) and sometimes it would not start. Dialing back to 90% cured the problem, and the full throttle light is on. Also, if you have a powerful system, consider programming in soft start and soft brake, if your ESC has these capabilities. Less stress on the gearbox. From: Dave Sue Moore [EMAIL PROTECTED] Date: 2004/03/15 Mon AM 02:25:31 EST To: RCSE [EMAIL PROTECTED] Subject: Re: [RCSE] Programming Help Pat, When you find out, let us all know. I have the same issue on one of my electric sailplanes using the 8103 Dave Moore - Original Message - From: Pat McCleave [EMAIL PROTECTED] To: RCSE [EMAIL PROTECTED] Sent: Sunday, March 14, 2004 8:29 PM Subject: [RCSE] Programming Help Hi Guys, I am in the process of setting up a Pulsar 2000 with a JR8103 radio and need some help. This is my first electric so I am in need of some help in how to set up the motor control. I have the plane programmed in so that all of the control surfaces are working, i.e. ailerons, flap and elevator. I would like to have the motor control set up on the trainer/retract switch for either on full throttle or all off. My question is, what is the best whole to plug in the speed control into in the receiver and how to go about programming the switch to turn it on and off? Any help will be greatly appreciated. See Ya, Pat McCleave Wichita, KS 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-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-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-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] JR DS161 and DS168 - differences ?
Does anyone know the differences between the JR DS168 servo http://horizon.hobbyshopnow.com/products/description.asp?prod=JRPS168 and the JR DS161 http://www.probuild-uk.co.uk/products/product.php? id=642keyword=cat_id=man_id=36 ? They look exactly the same but according to the information given in these links the DS168 is thinner by 1.4mm . I have two DS161 and I am pretty sure that it uses Hitec 125MG's mechanical components ( case, horn, gear train ) but has completely different control electronics. Has anyone seen the inside of DS168 ? Y C Lui 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] Re: Raindrops on the wing - Answer
The flying house analogy again ? come on Gordy, you are better than that! The followings popped up in my mind when I read about this rain drop theory : 1) The tiny pits molded onto the surface of golf balls are supposed to reduce the separation of air flow and hence reduce the drag of the ball. Will rain drops on the wing surface actually improve the performance of the model ? 2) Some free flight models have got saw-toothed leading edges on their wings, a feature that is designed to make the air flow turbulent and delay the onset of flow separation or stall. I am wondering whether rain drops will do the same good . I seldom fly in rainy days but even if I do, my fingers are always the prime source of troubles and what I worry most about . Y C Lui --- In [EMAIL PROTECTED], [EMAIL PROTECTED] wrote: If you have the latest most exact airfioil matched with the best planform, span, tail foil and moment, perfectly balanced, and get the highest ever launch...if you don't find lift, you ain't staying up. If there are raindrops on your wing, it will make a difference...if you don't find lift you won't stay up and your wing will be wet. Wet houses fly just fine in lift...in fact most of the time when you see houses flying they are wet, so likely that indicates something about the what effect raindrops have on soaring :-) Gordy 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] Elita
I have flown my Elita for about 10 times on the slope and I am still in the process of testing different setups and ballast weight so no final conclusion can be drawn at this stage. It is slower than my Pike WR but it may not be a fair comparison as I have a lot more flying hours with my Pike. It is expected that further fine-tuning will narrow down the performance gap. Having said that, I am quite certain that the Elita doesn't like heavy ballast. Under good lift conditions, my Pike is quite happy with full ballast ( about 1 kg ) but putting such a weight on the Elita will result in tremendous energy loss in tight turns. 500g seems to work quite well for the model. Such characteristic seems to indicate that the airfoil of the Elita, which exhibits some reflex at the trailing edge, is designed to work in a very narrow range of CL and the drag will increase tremendously if the range is exceeded. For me, it's not an easy plane to fly but I like the challenge. That's all I can tell at the moment and I look forward to hearing the experience of other Elita owners. Y C Lui --- In [EMAIL PROTECTED], Michael Conte [EMAIL PROTECTED] wrote: Has anyone on the list flown the Elita from Jaro Muller? If so, what did you think? I found a website that mentioned a possible cross tail version. Is there any truth to that? As always, thank you. Mike Conte Far away from home 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-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] Wing tape residue etc
Turpentine, Kerosene, WD40 . --- In [EMAIL PROTECTED], Rense Lange [EMAIL PROTECTED] wrote: What is the best way to remove wing tape residue? What tape do I get that doesn't leave chunks like my old stuff? --- Rense Lange --- [EMAIL PROTECTED] 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-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] Soaring in LA and Las Vegas
Hi guys , My friend will be visiting LA and Las Vegas next week and he would like to know where he can taste the lift of US air there. Can anyone suggest some soaring sites or provide the contacts of local RC soaring clubs ? Thanks in advance, Y C Lui 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] CSM air war unit
Hello, Has anyone heard about a garget called CSM air war unit used in model helicopter dogfight ? It is a device carried on board of model helicopters that simulates machine guns by emitting infra red beams to shoot down the guy in front. The unit can set up to lock up the throttle or pitch for 1 to 2 seconds when the helicopter is hit. I am thinking whether it is possible to use the device in our air combat game. Pls drop me a line if you know where the info. about the device can be obtained. Thanks, Y C Lui 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] Surface flutter revisited
Full scale... This brings back a piece of memory some 2 years ago when I was in a Pitts and Tiger Moth as a passenger. When I asked the pilot why the control stick didn't return to the center when I released my hand, he looked at me as if I had asked the dumbest question in the world ! He then went on explained to me that once the plane was in the air, the airflow would keep the control surfaces at the trimmed positions. He was right ! he was particularly right about the Tiger Moth. I had to exert some real force on the stick before I could move it . Air flow did keep the stick at the netural position and I could get my hands off the stick without getting any fluttering. So full scale airplanes, at least some of them, do not have any expensive digital servos to nail control surfaces in place and yet they do not have fluttering problems. This had puzzled me for quite I while before I stopped thinking about it. Anyone has got any idea on the reason behind ? Y C Lui --- In [EMAIL PROTECTED], Bill Conkling [EMAIL PROTECTED] wrote: I think that we should take lessons from the full scale guys. Keep linkages tight, hinges free, miniumize slop, use light weight control surfaces and make sure they are balanced. .bc([EMAIL PROTECTED] http://www.widomaker.com/~conk Williamsburg, VA 23185 On Fri, 21 Feb 2003, Craig Toutolmin wrote: I want to run this by everyone for confirmation or correction. I have talked to several engineer types and have been told that what we are working with is a mass/spring system. The mass is the control surface and the spring is the give in the servo - assuming the linkage and hinge are tight, arranged to minimize the effect of gear slop and positioned to minimize torsional flex. The system will flutter at some harmonic. Large amplitude is destructive. A very small amplitude is the goal. The softer the spring and the heavier the surface (aft of the hinge line) the larger the amplitude of the harmonic. Smaller surfaces minimize amplitude. Lighter surfaces minimize amplitude. Surfaces counterbalanced to the hinge line will minimize the amplitude. Servos with a higher spring constant (firmer) will minimize amplitude. Whatdayathink? Craig Toutolmin 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-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-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] Antennas in carbon booms
Kirk's test may be kinda rough but I won't agree that it doesn't tell anything. As a matter of fact, it is in line with the experience reported by many that installing antennas inside carbon fuselage does not result in noticeable reduction in range. Would like to hear some constructive suggestions on how to run a more reliable test to obtain more conclusive results but pls be practical. For example, I don't consider it necessary to measure the effect of carbon on the antenna pattern inside an echoless chamber. Y C Lui --- In [EMAIL PROTECTED], Simon Van Leeuwen [EMAIL PROTECTED] wrote: Hi Kirk, If I understand you correctly you have hooked up a length of wire to an SA I/P and introduced an external signal @ 75.5MHz. I will assume the wire is fed throught the SA's centerfeed (+) terminal, ignoring the GND (outer threaded structure and the SA's metal casing itself). I will also assume that you are reading directly off the SA. It does not tell you anything. Add to this that 1dB of any type of RF measurement, is not enough to make any decision as to whether there is actually a gain or loss in energy. Also keep in mind that an antenna on a RX with assorted wiring on servos etc represents a significantly different scenario than the test you have generated. BTW, do you recall the spec for the chipset used in the Vision's storage as to how many storage or input parameter changes before the system starts generates errors? Kirk Hanson wrote: After the discussion of the past couple of days, I decided to do a quick test. I took a 24 inch piece of insulated wire and connected it to an HP spectrum analyzer. Nothing magic about 24 inches except that it would fit completely in the arrow shafts that I have. The arrow shafts are a Beman ICS400 and an ICS500. I don't know the lay-up in these except they are carbon colored and have the word carbon on them. I found an ambient signal at 75.5MHz and used this as the transmitter. I found that I had about 1db more signal with the arrow shaft over the antenna. Explanations might be that the arrow shaft is longer so it coupled in more signal, or that the arrow shaft made the antenna impedance closer to 50 ohms (the input impedance of the analyzer). I also tried this at 36MHz and found that the arrow shaft over the antenna was about the same or slightly better that the antenna alone. Any comments from the RF engineers out there? Kirk Hanson TPG San Diego -- *~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~* Simon Van Leeuwen, Calgary, Alberta RADIUS SYSTEMS Cogito-Ergo-Zoom IAC25233*MAAC12835*IMAC1756*LSF5953*IMAA20209 *~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~* 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-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] The lighter the better in weak lift ?
I am not too sure. . . . . It was rather foggy ( so¡K NO thermal for sure ) off the slope today and the wind was really weak so I flew my Highlight HLG ( I believe it's the equivalent of Omega in the US. info at http://www.euro- sailplanes.co.uk/uk/html/sport-hlg/highlight.htm ) thinking that my model is probably the only one that can stay aloft. Much to my amazement, my friend¡¦s all-mold mini NYX ( http://www.euro- sailplanes.co.uk/uk/html/sport-hlg/mini-nyx.htm ) did equally well, may be even slightly better. Both models are 1.5m in span and have similar wing area but my friend¡¦s moldy is twice as heavy as my HLG. The fact that both models can stay aloft equally well makes me wonder whether weight is such a dominating factor in determining how floaty a glider is under weak-lift condition. I know the information given here is too rough and incomplete for any systematic analysis but if someone can suggest what MIGHT have counteracted the weight penalty of my friend¡¦s moldy, I will appreciate it. I have came across the theory that up to a certain point, increasing the weight helps to increase the speed and hence the ¡§Reynold¡¦s number¡¨ which is supposed to make the airfoil more efficient. To be honest, I have not done sufficient reading on aerodynamics to understand that theory well but I did try it out today by putting 10% more weight into my HLG but there was not any perceivable improvement. Having said that, the test was very rough so it really didn¡¦t prove or disprove anything. If anyone has any ¡§thumbs-on¡¨ experience in this regard, I would like to hear about it. Thanks, Y C Lui 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] Jr Service
I have heard some negative comments about JR¡¦s service recently in other forums and I am glad to see something more positive here as I have been using their radio equipment for very very long time. JR earned by loyalty by their wonderful service. Before I quitted this hobby many years ago, I had sent servos, receivers and transmitters back to JR Japan ( I am living in Hongkong ) for service and I always got my equipment back looking almost like new. I didn¡¦t have to pay a single Yen in the process as JR bore the full cost of shipping and servicing. Now I am back again and I am still using my old JR Apex Computer radio - JR¡¦s first generation computer radio. It had taken me many months to save enough money to get it. I was still going to school at that time. After so many years, I am wondering whether JR is still the good old JR I knew. No need for their service yet but would like to hear some more experience . Thanks, Y C Lui Hongkong --- In [EMAIL PROTECTED], George Gillburg [EMAIL PROTECTED] wrote: At 07:13 PM 2/6/2003 -0500, [EMAIL PROTECTED] wrote: Is it worth sending a reciever back to JR for testing and/or service or would I be better off buying something else? Charles I'll bet it would be to your advantage. I just sent in 4 servos to JR, 2 ea 341 and 2 ea 351. I got back two servos they said were working properly (they had been in a crash which is why I sent them in) and two new servos, 1 of each type. The bill for this service was a whopping $ 7.50! I think it was well worth my investment. I don't think you'll regret sending in your receiver. 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-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] Fixing wing servo covers
Hi guys, Are there any neat ways to fix wing servo covers to all-mould wings ? Most people just tape the covers in place in order to make them easily removable when the servos need be serviced. The method is simple and practical but it's not cosmetically great. Thanks, Y C Lui 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] Can the new generation of computer radios do this ?
Hi Guys, I am wondering if there are any radio transmitters out there that allows the user to program the mapping between the control slot number and the control function. My old ( 10 years + ) JR computer radios have got the following slot assignment : Slot 1: Throttle Slot 2: Aileron Slot 3: Elevator Slot 4: Rudder As I am flying sailplanes, the throttle / gear controls are useless to me but I do need the AUX1 control very often as most of my sailplanes have seperate servo for each aileron. That means the receivers I use must support no less than 6 channels ( Thro, Ail, Elev, Rudd, Gear, AUX1 ) and this requirement has been restricting my choice of receivers. What I would like to have is a radio transmitter that allows me to swap the AUX1 and throttle control slot at the so that I can use a 4- ch receiver in the following manner : Slot 1: AUX1 Slot 2: Aileron Slot 3: Elevator Slot 4: Rudder Is this supported by the new generation of computer radio transmitters ? Thanks in advance , Y C Lui 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] Beware when ordering from Soaring Stuff
Check out what's reported by customers ( including me ) in : http://www.rcuniverse.com/showthread.php?s=forumid=35postid=518159#post518159 Y C Lui :( 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] difference between F3B and F3F machines
Hello everybody, I am new to competition flying and wonder if someone can shed some light on the major differences between F3F and F3B ships. I have tried ( may be not hard enough ) to search for internet resouces on the subject but all I could find were rules and task descriptions. From the info. given in many vendors' websites, it appears that most F3B ships can be used for F3F but there are also models offering different airfoils for difference purposes like MH32 for F3B and RG15 mod. for F3F. I am in the process of looking for an F3F ship. Any advice on how I should choose my first model will be very much appreciated. Thanks, Y C Lui 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] color pigment in epoxy gelcoat
Hello everybody, I wonder if anyone know what kind of gel coat materials are used in all-mold epoxy-glass gliders like the Nemesis 60 slope racer. the wing servo cover of my Nemesis got damaged and I am planning to made a replacement by myself. The original cover is dark blue in color and the gelcoat was sprayed on as I can clearly see dotted patterns when holding it against strong light. What amazes me is that although the gelcoat is extremely thin, the opacity is very high. I have tried to make the gel coat by mixing color pigment ( in paste form ) into West System epoxy 105 resin/206 hardener but before the original opacity is attained, the dosage of color pigment is already so high that the cured resin becomes unacceptably soft.\ Can anyone offer some suggestions on materials that I can try ? Thanks in advance , Y C Lui 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] JR R610M receiver
Hello, I am planning to order the JR 610M receiver for my new sailplanes and wonder if anyone can share his related experience with me, good or bad. Thanks, Y C Lui 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.
