 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| HomeDiscussion Groups General ModelsRailroadsRocketsRadio Controlled Air ModelsHelicoptersLand ModelsWater ModelsModelGeeks.com Contact UsLink To UsSearch & Site Map |
Model Forum / Radio Controlled / Air Models / February 2004Technical question for the FW gurus
Hi group I'm flying a homebrew swept-forward wing similar to the foamie 'XBow' and 'Bird-o-prey' series. Except mine is balsa and CF. The plane is very 'labor intensive' to fly, particularly in the pitch axis. I think it would benefit form a gyro on the elevator channel. And herein lies the problem. It uses an onboard mixer (Graupner GR-3020) for elevon mixing, and a Hitec 555 Rx. I want to put the gyro (Ikarus IK-0615 Micro Gyro) on the elevator channel, between the Rx and Mixer, and don't see any reason why it shouldn't work. I asked Hobby Lobby's tech deartment, and they said no it wouldn't. So I'm just looking for second opinions (as many as possible<g>) before investing in 70 bucks in the gyro. Thanks in advance for any advice. Bill (oc) Anti-spam address: oldcoot88atwebtv.net Change 'at' to@ > Hi group > I'm flying a homebrew swept-forward wing similar to the [quoted text clipped - 13 lines] > Anti-spam address: oldcoot88atwebtv.net > Change 'at' to@ Could you not setup exponential on the elevator channel first that will desensitize the control around neutral. Failing that I don't know much about the Ikarus gyro but make sure you get one designed for plane use as some of the cheaper heli ones are heading lock only which will guarantee a crash for you. Chris Chris wrote, >Could you not setup exponential on the >elevator channel first that will >desensitize the control around neutral. Actually the radio has no expo capability. A gyro in the elevator channel, between the Rx and elevon Mixer, *should* work, seems like. The gyro's action should register correctly on both elevons, unless there is some obscure reason why it won't. But before plunking down $70 for the gyro, I just wanted to seek greater wisdom than my own. >...I don't know much about the Ikarus >gyro but make sure you get one >designed for plane use as some of the >cheaper heli ones are heading lock only >which will guarantee a crash for you. The Ikarus Microgyro is a no frills single axis jobbie strictly for planes. Thanks Bill(oc) Anti-spam address: oldcoot88atwebtv.net Change 'at' to@ > Actually the radio has no expo capability. A gyro in the elevator > channel, between the Rx and elevon Mixer, *should* work, seems like. The > gyro's action should register correctly on both elevons, unless there is > some obscure reason why it won't. But before plunking down $70 for the > gyro, I just wanted to seek greater wisdom than my own. OK then, do expo the old fashioned way... offset the servo horn at it's neutral position by a tooth, re-adjust the control linkage so the flying surface is at the correct neutral position and try it. Chris Chris wrote, >OK then, do expo the old fashioned >way... offset the servo horn at it's neutral >position by a tooth, re-adjust the control >linkage so the flying surface is at the >correct neutral position and try it. Actually this aircraft would not benefit from expo. Being a swept-forward flying wing (as opposed to a 'normal' FW), it is very short coupled in pitch. The problem arises from an old coot (me) striving for a juvenile 'kool' look. I've temporarily added extended tail booms and a horizontal tailplane to tame the beast in pitch, but it detracts from the tailless 'kool' factor. I want to keep it tailless, and am certain it would benefit from a pitch gyro on the elevator channel. The swept-forward wing uses full length elevons, with aileron/elevator mixing done with an onboard mixer. I want to plug the gyro into the receiver's elevator port so it is in the elevator channel between Rx and Mixer. I *assume* the gyro's action will then correctly register on the elevons. Other people said it won't work, but I can't understand why it won't. And that's why I'm here humbly seeking greater wisdom on "why it won't work". Many thanks Bill(oc) Anti-spam address: oldcoot88atwebtv.net Change 'at' to@ You didn't say much about how it's behaving, but if it's pitch sensitive, why not try moving the CG forward a touch before resorting to a gyro? Also, try to use a little expo in the pitch axis as been suggested before. Morris > Hi group > I'm flying a homebrew swept-forward wing similar to the [quoted text clipped - 13 lines] > Anti-spam address: oldcoot88atwebtv.net > Change 'at' to@ |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.