[RCSE] WD-40, antenna, etc
We've all heard it I'm sure, If it moves and shouldn't, use 'Duct-tape', if doesn't and it should use WD-40. WD-40 is a water displacement treatment. If you are protecting metal from the ravages of water, WD-40 is good. If you want to loosen a rested bolt, then Liquid Wrench is better and faster. If you want to lubricate, then some kind of petroleum or synthetic lubricant is the choice. The major cause of problems with our antennas is dirt. I is attracted to the oily resedue left by petroleum based lubricants and causes wear and that leads to looseness. The best thing we can do is keep the antenna clean. Eliminate the buildup of dirt and grime. I suspect that the clean dry antenna is better than one with oily residue. bc RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
RE: [RCSE] Anti-virus software - a tale of woe
Yup. Good book. The ending is a bit preachy, though. -- Barrett -Original Message- From: Ben Diss [mailto:[EMAIL PROTECTED]] Sent: Monday, April 23, 2001 12:08 PM To: [EMAIL PROTECTED] Cc: 'Steven Bixby'; 'Dave Seay'; Subject: Re: [RCSE] Anti-virus software - a tale of woe Have you read the book The Cuckoos Egg? Great story about tracking down hackers. http://www.amazon.com/exec/obidos/ASIN/0743411463/ -Ben Barrett Stridiron wrote: What is really surprising is how often I am alerted that someone is trying to break in to my computer, even with a modem connection. Subseven Trojan is the usual warning. It seems there are a lot of junior hackers out there... Script Kiddies is the technical term for these folks. Bastards works, too. The average internet user's setup does not run any servers, so there are no real break-in points to exploit even. I suspect the gross majority of hackers don't even bother with sites that aren't known commercial or government entities. We need to clear up a point. There is Anti-Virus software and Firewall software. Norton security 2001 has both (I believe). The attempts you are talking about are being thwarted by the firewall. If anyone is running a cable modem or DSL modem and does not have a firewall, they are asking for trouble. Funny this subject should come up now... modem users can be at risk. The linux box in the basement at my home, which is a DHCP server, firewall and gateway for my home network, got hacked recently. I'm running Red Hat 6.2 on it. Since my internet connection is dialup (the local phone company wants $1200/month for a 128K DSL connection! Pass.) with no fixed IP address, I assumed there would be no major security problems, and didn't lock it down. Saturday night, I was in the basement finishing a plane when I heard the modem fire up. Not unusual, as windows machines on the LAN sometimes cause the gateway to dial for their who has requests. These will normally time out within two minutes. Twenty minutes later, I happened to glance at the modem. The SD (send) light was on, steady. WTF? Something on the LAN is sending a lot of data, but what? All the Windows machines were either switched off or asleep; the only machines active were my Powermac G3 (playing MP3s), the Linux file server, and the Linux gateway. A check of the traffic out of the gateway revealed a perl script was scanning external IP addresses, and logging the results to a hidden file. Shit! I killed the offending process, shut down the modem connection, and started digging. Thanks to my hidden security logs (the standard system logs had all been scrupulously cleaned by the invader), I discovered the following: - In early March, someone polled my machine and discovered its security holes. - Shortly afterward, my (encrypted) password file was transferred out via ftp. - User OPERATOR logged in remotely, added two new user accounts ISHII and OBREGON. - ISHII and OBREGON each logged in and transferred a single file to their account. - Three rootkits were installed and activated. One ran the IP address scanner/logger. Another tracked how many users were logged in, relisted the password file and all known internal LAN connections at regular intervals. The culled information was (supposed) to be sent via email. (No working email on the firewall box - this may have saved other machines on my LAN from discovery) The most insidious (and frankly, ingenious) one sniffed all IP traffic passing through the firewall and logged the most interesting tidbits to a hidden file. This script caught damn near every unencrypted username/password combination that came by. This includes my ISP account info, my multiple email accounts and my login info for *many* websites, INCLUDING PAYPAL. =:^o I finished cleaning up the machine. For now, it is running a slightly modified version of the firewall script I use on the servers here in the office. Tonight, I plan to slay and rebuild the firewall at home, as I can't be sure that I caught everything. In the meanwhile, I'm changing every current password I have. -- Barrett 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] Long pushrods
With the demand for long pushrods growing, can we get the suppliers of carbon fiber stuff to meet our needs? Considering that the stuff is artificial, it shouldn't be a problem to grow 'em longer than 4 feet. These horror stories of spliced pushrods are making me itchy all over! Perhaps an email campaign, harassing phone calls, petition drives and such. Matt
[RCSE] Range with video onboard
here are always those who know how to up the output on your tx (say using directional antennas, high-power ops), but in most cases the video link dies first! It is normally less than 1000 yards, unless you use pro stuff, satellite links or something likewise exoctic. A german group using 4.4 MHz equipment stated that their tv-tx range was about 800 meters, depending on direction, and they use small directional antennas! I gather that Tom Rust at times has run into rf problems, with the tv camera eventually giving a very close view of the terra firma before transforming into something that might once have been a glider with tv-equipment onboard. There is simply no room in most models for high-power tv- equipment, so you will have to rely on directional antennas and such, and asistants, working the amplifiers and antennas, if you want to get far from your home base. And a safety pilot will den needed as well! For selfnavigating aircraft (aka UAVs), whichever size, you still want to have a take-over-and-bring-home function (a bit like a TACOMA (sp?) Herc). And a selfdestruct, and emergency parachutes! We are now speaking LOTs of money, and extremely complex operations, not least legal-wise, as AF, ATR and other agencies must be cooperated with. The among best pictures I've seen have all been taken from simple aircraft, like the Teddy and a HLG! So a two miles radius, at the very most, for us without sponsorship from CIA, The Sultanate of Burnei or similar institutions! EPP models are good as they provide some shock protection for your equipment an ability to take off almost anywhere! Size is a matter of legalities, taste and funds. Tord, Sweden PS A lot forget that the a badly taken photo doesn't get better if taken from a model airplane, and that their own upturned faces aren't the most interesting either! As a technical feat aerial photos are as old as flight itself, so while it at times can get thrilling, as when some strap their digital camcorder on the back of their models and then start low-level aerobatics, while photos of the local model airfield seldom is! URL:http://www.ozemail.com.au/~majali/Zagi-THL.jpg URL:http://www.ozemail.com.au/~majali/Zagi-N-big.jpg URL:http://www.tord.nu Local weather: http://www.reab.se/weather.html -- If reply difficulties - use [EMAIL PROTECTED] Tord S. Eriksson, Ovralidsg.25:5, S-422 47 Hisings Backa, Sweden Tel. (mobile): +46 (0)736 77 88 96 RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] Camber/Reflex Settings?
I've slowly been working my way up the glider food chain (foamie, built up, composite, etc..) and now have a couple of planes which I need help/suggestions setting up. One is an electric Graupner Cumulus 2000, which has ailerons/v-tail, the other is a Flamingo HLG which has full ailerons/spoilerons and a v-tail. I've got the basics down and can fly the models as they are setup now without any trouble (in fact, both are really nice planes for where and how I fly), but I'm looking to learn more about the performance gains that can be had by making minor adjustments to the control surfaces. I often read here about folks adjusting the camber/reflex on their planes while flying to achieve various results. I haven't been able to find a source for information on how/why and how much these settings can affect a plane's performance. For example, on both these planes, I have a trim knob on my Futaba Tx which allows me to change the aileron trim up and down to provide reflex or camber, but I have no idea what the appropriate control throws should be.. is 1/8 (just picking a random amount) a little or a lot when you are changing the profile of a wing? What guidelines should I use to set the appropriate range of motion, and when should I use each? Another question specific to v-tail/aileron models.. how many of you fly with rudder/aileron coupling? Right now I have both of my planes set up so that I can switch between coupled and uncoupled modes, but was wondering what most people did? Do you like to 'fly' the tail 100% of the time, or prefer the simplicity of 'setting it and forgetting it'? Thanks for any help.. -- Tom _ Get your FREE download of MSN Explorer at http://explorer.msn.com RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] Ducky nausea
The moto of the soaring exchange might have to be changed to OPINION BEFORE KNOWLEDGE. I've heard so many contradictory opinions about the use of coil wound antennas that if I didn't know better I really be confused. It's is hard to know why some of my fellow pilots have had such HORRIBLE results using coil wound antennas while so many others have had no problems at all. One thing is clear to me, at least, and that is that there is no REAL evidence that the trouble was with the antenna itself. One other thing is clear. It's time to move on from this subject. These posts are clogging up the exchange with unsound advise. One guys says to use WD40 another says not to because it is not a lubricant and it evaporates. WD40 is many things including a lubricant. Don Edberg suggests the use of WD40 in his often misquoted article about antennas. Others tell us about the near disasters when using a coil wound (rubber duck) antenna while many others (including me) report being able to fly their models to beyond vission. Who to believe? I guess I'll just trust my own experience. Might it not be a good idea for you to do the same and if you have had not experience either way all I can say is good luck. These posts have proven nothing and I include my own. Now, if you want to talk about what makes a good cornedbeef sandwich I think I can pontifcate. But, I guess that would be for another form. Ed
Re: [RCSE] Long pushrods
We have them in Europe but I have not imported any. I will put some on the next order... Smooth Sailing,Karlton Spindlehttp://www.MultiplexRC.com - Original Message - From: Matthew Lydon To: [EMAIL PROTECTED] Sent: Tuesday, April 24, 2001 8:23 AM Subject: [RCSE] Long pushrods With the demand for long pushrods growing, can we get the suppliers of carbon fiber stuff to meet our needs? Considering that the stuff is artificial, it shouldn't be a problem to grow 'em longer than 4 feet. These horror stories of spliced pushrods are making me itchy all over! Perhaps an email campaign, harassing phone calls, petition drives and such. Matt
Re: [RCSE] Range with video onboard
I've been experimenting with inexpensive (read cheap) on board video for a while, so far without much success. It seems like a big hassle, especially since I really don't want to fly the plane from the video...i just want to get some cool stuff recorded. I think the best solution to this is to get a video camera and strap it to the plane, as Paul Naton did in Endless Lift 2. Of course, this requires a somewhat large plane and some good lift, not to mention risking your video camera. My hope is that smaller video cameras will come down in price fairly soon and make it worth trying. Either that, or I'll try to find a used/damaged camera (for example, a camera with a broken view finder, which i really don't need anyway). Tord wrote: here are always those who know how to up the output on your tx (say using directional antennas, high-power ops), but in most cases the video link dies first! It is normally less than 1000 yards, unless you use pro stuff, satellite links or something likewise exoctic. A german group using 4.4 MHz equipment stated that their tv-tx range was about 800 meters, depending on direction, and they use small directional antennas! I gather that Tom Rust at times has run into rf problems, with the tv camera eventually giving a very close view of the terra firma before transforming into something that might once have been a glider with tv-equipment onboard. There is simply no room in most models for high-power tv- equipment, so you will have to rely on directional antennas and such, and asistants, working the amplifiers and antennas, if you want to get far from your home base. And a safety pilot will den needed as well! For selfnavigating aircraft (aka UAVs), whichever size, you still want to have a take-over-and-bring-home function (a bit like a TACOMA (sp?) Herc). And a selfdestruct, and emergency parachutes! We are now speaking LOTs of money, and extremely complex operations, not least legal-wise, as AF, ATR and other agencies must be cooperated with. The among best pictures I've seen have all been taken from simple aircraft, like the Teddy and a HLG! So a two miles radius, at the very most, for us without sponsorship from CIA, The Sultanate of Burnei or similar institutions! EPP models are good as they provide some shock protection for your equipment an ability to take off almost anywhere! Size is a matter of legalities, taste and funds. Tord, Sweden PS A lot forget that the a badly taken photo doesn't get better if taken from a model airplane, and that their own upturned faces aren't the most interesting either! As a technical feat aerial photos are as old as flight itself, so while it at times can get thrilling, as when some strap their digital camcorder on the back of their models and then start low-level aerobatics, while photos of the local model airfield seldom is! URL:http://www.ozemail.com.au/~majali/Zagi-THL.jpg URL:http://www.ozemail.com.au/~majali/Zagi-N-big.jpg URL:http://www.tord.nu Local weather: http://www.reab.se/weather.html -- If reply difficulties - use [EMAIL PROTECTED] Tord S. Eriksson, Ovralidsg.25:5, S-422 47 Hisings Backa, Sweden Tel. (mobile): +46 (0)736 77 88 96 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] Range with video onboard
I have a really cool camera that works great I should take it out this weekend to the scale event at banos. Smooth Sailing, Karlton Spindle http://www.MultiplexRC.com RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Range with video onboard
Just promise you'll get some speed runs in the shots! Gotta see some terrain whizzing by! Watching video from a glider circling or even doing loops at 800 feet gets old pretty quickly. Has anyone done onboard video from a plane DS'ing yet? This could be your chance! :-) Karlton Spindle wrote: I have a really cool camera that works great I should take it out this weekend to the scale event at banos. Smooth Sailing, Karlton Spindle http://www.MultiplexRC.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]
Re: [RCSE] Camber/Reflex Settings?
Camber is VERY useful for getting more lift on light days. Works better on some airfoils than others. Its never more than 3-5 degrees to be really effective. 1/8 is probably too much for a lot of cases. I'd say you get most of your benefit in the 0-3/32 region, but it probably depends on the ship. A slight drooping of the trailing edge often does wonders, especially for 'fast' airfoils with no natural camber (downward curving) of the TE. There are plenty of times I've only been able to fly a sloper on a light day by having camber. As for the ruddervators for slopers. I've had about 4 six-servo slopers and I've never found the extra rudder servo worth it for a sloper. If I have a rudder servo on a v-tail I usually turn it off! It only messes up the roll. Recently I built a 6-servo sloper as a 5 servo version. Gave me more room in the canopy. I don't miss it one iota. On my TD planes, I use rudders for flying thermals. In that kind of flying a rudder is very important for making flat energy-efficient turns. For slopers the rudder function is good if you are really racing, as in competition, where you are measuring tight times. For a turn you *can* see a tightening of the turn with aileron/rudder coupling, but it is not impressive enough to use in normal fun or aerobatic flying, in fact you'll find yourself tending to fly with rudder switched off, because the flying is more exciting overall without them. -Paul Tom Sheehy wrote: I've slowly been working my way up the glider food chain (foamie, built up, composite, etc..) and now have a couple of planes which I need help/suggestions setting up. One is an electric Graupner Cumulus 2000, which has ailerons/v-tail, the other is a Flamingo HLG which has full ailerons/spoilerons and a v-tail. I've got the basics down and can fly the models as they are setup now without any trouble (in fact, both are really nice planes for where and how I fly), but I'm looking to learn more about the performance gains that can be had by making minor adjustments to the control surfaces. I often read here about folks adjusting the camber/reflex on their planes while flying to achieve various results. I haven't been able to find a source for information on how/why and how much these settings can affect a plane's performance. For example, on both these planes, I have a trim knob on my Futaba Tx which allows me to change the aileron trim up and down to provide reflex or camber, but I have no idea what the appropriate control throws should be.. is 1/8 (just picking a random amount) a little or a lot when you are changing the profile of a wing? What guidelines should I use to set the appropriate range of motion, and when should I use each? Another question specific to v-tail/aileron models.. how many of you fly with rudder/aileron coupling? Right now I have both of my planes set up so that I can switch between coupled and uncoupled modes, but was wondering what most people did? Do you like to 'fly' the tail 100% of the time, or prefer the simplicity of 'setting it and forgetting it'? Thanks for any help.. -- Tom _ Get your FREE download of MSN Explorer at http://explorer.msn.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]
Re: [RCSE] Camber/Reflex Settings?
Paul Klissner wrote: On my TD planes, I use rudders for flying thermals. In that kind of flying a rudder is very important for making flat energy-efficient turns. Isn't flat and energy-effiiceint kind of any oxy-moron? The former implies some deal of skid through the turn, which isn't energy effiencent. This has had me somewhat confused for some time. I took a full scale glider ride with a pretty experienced competition pilot a while back, and noticed that all the thermal turns we made were coordinated, with the little yaw string dealie straight up the canopy. They also seemed to be at a fairly high bank angle. The primary purose for the rudder seemed to be to prevent the huge amount of adverse yaw, not for flattening out the turn. So why is it that r/c gliders do flat thermal turns in small thermals when the big guys do coordinated turns in big thermals? Exposing the side of the airplane to the airstream by skidding around the turn can't be terribly efficient. Is it just because our thermals are so much smaller that we need to skid around to stay inside them? Can someone enlighten me on this? Brett RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] So you want a SCREAMING DEAL?
http://multiplexrc.com/teddy.htm WITH motor Prop, 2 servos, 1 Speed Control, 1 Battery $100.00 This week only! http://multiplexrc.com/picojet.htm WITH motor prop, 2 SERVOS, 1 speed control, 1 battery $129.95 This week only! $139.00 for Combat version. Online orders only we will take the discount at time of order processing. YOU MUST mention this deal when placing the order. Offer good in the USA only does not include SH. Pico Jet is an oversized box per UPS :( Dealers this is a Cyber Brick and Mortar deal! Smooth Sailing, Karlton Spindle http://www.MultiplexRC.com RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Camber/Reflex Settings?
The sinking speed in a turn = straight line sinking speed / (cos(theta)^(3/2)) where theta is the bank angle -- provided that the L/D for a given angle of attack is the same while circling as when flying straight. Straight line sinking speed, in turn, is forward speed / (L/D). Now if you're flying straight and you decrease the L/D by skidding along in a yaw, your sinking speed goes up. Similarly, if you fly a circle in a skid, you sink faster than you would in a nicely coordinated turn of the same diameter. Of course, for some planes it might still be true that if you're going to input only aileron or only rudder, you could be better off using only rudder -- not because you want a skidding turn, but because that particular plane gives a more nearly coordinated turn with rudder alone than it would with aileron alone; the skid is less with rudder only than it would be with aileron only. This depends on dihedral and force arrangement. However, an ideally coordinated turn (which for most planes requires inputs from both rudder and aileron) is best. I took a full scale glider ride with a pretty experienced competition pilot a while back, and noticed that all the thermal turns we made were coordinated, with the little yaw string dealie straight up the canopy. They also seemed to be at a fairly high bank angle. The primary purose for the rudder seemed to be to prevent the huge amount of adverse yaw, not for flattening out the turn. So why is it that r/c gliders do flat thermal turns in small thermals when the big guys do coordinated turns in big thermals __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
