Here's a good one.
I have an Hanger 9 Edge 540, and I am getting aileron hits only in the air. The plane always makes a 90% bank to the right. We have tried everything we can think of. Checked all engine components and make sure they are secure. Change receivers, changed servos. When I range check it on the gorund, it is fine with or without the motor running. Using JR radio equipment with a SPCM receiver. Problem was same with ZPCM receiver, so that pretty much eliminates the receiver. I'm stumped. Anyone got any suggestions. Oh, by the way, I get the reaction pretty much anywhere on the field, not in just one area. I could sure use some help.

Thanks

Bob

Have you checked any and all servo extensions yet? Are you running a gas engine? I've seen this happen on a gas powered plane where the ignition battery was weak. Changed it out and the glitch went away. Never could explain it.

What metal components could be vibrating at flight vibration frequencies that isn't happening on the ground. Some metal to metal contact perhaps? I would be looking at a metal to metal rattle first.

Possible loose wire in the rx battery?

I thought about the servo extensions, but did not change them out. I'm running a Satio 180 on the plane. The extensions could be vibrating around in the wing in flight I guess. I usually make my own extensions, but in this plane, I bought some. I believe I will change them out.
As far as the battery goes, it's a new NiMH 1650 MA. I,m not losing any of the rest of the plane, and it's not going into fail safe. Also, it has a brand new heavy duty JR switch on it.

Is it doing it at all speeds or just slow speed?

All speeds. The last time it happend, I had just come out of a loop and powered up. Boom 90 degree roll to the right. Also does the roll quite often when landing. I have become aware and am ready, I can give it left and get it back. The plane will not last long however, if I don't figure out what is causing the problem though. I did soder in my own aileron extensions this morning. I have the ailerons seperated on channels 2 and 6 on a JR 8103. The xmitter is fine, have flown other planes with it and now problems.

Well, I guess all you guys are as stumped as I am.

Bob

You do have a problem and it is electrical. Are you using analog or digital servos for airleron
control? Does the problem only occur at a low throttle setting? Have you noticed any other control functions acting in a erratic manner?
I ask these questions because I had a very perculiar problem with my rudder channel. at low throttle setting an input of rudder would cause the rudder to oscillate and not return to center until I advanced the throttle. It started off slowly and reached a point where the rudder channel became unuseable. The problem only occured when I imputed a right command. Believe this or not but the problem started to effect my elevator channel as well. When I commanded either up or down elevator the rudder would move correspondenly.
The transmitter I was using was a JR388S. Naturally when I contacted JR they said send it in for an evaluation. They provided no technical support. Fortunately I have some electronic experience and found I had a defective rudder pot in the gimbal assembly. I removed and replaced the pot and the problem vanished.
You may or not have a transmitter problem but I did. Find a shop that does CB repair and ask them if they could perform a pulse chain check on your airleron channel.

Had a simular problem with a Giles 202 and Airtronics radio. Someone had mentioned to look for metal to metal rubbing but as I found out grafite to grafite will do the same thing. Are you running grafite pushrods? The problem with mine turned out to be the antenna wire would pull down under a g load (loop) close to the rods as I worked the elevator it would generate enough frequency to interfere with the radio. I ended up running the antenna along the bottom inside of the fuse and secured it with a little tention and the problem no longer exsist. Good luck and hope you get down to the problem

Thanks Guys for the info
I'm using digital servos, hitecs. I change out the aileron servos and the problem remained. No change.
Always giltches to the right. I was running a pull pull system on the elevator, but am in the process of changing to a push rod. I thought the problem might be with the pull pull sys, so I moved the antenna wire out to the wing tip on one filght. No improvment.
The porblem is not limited to any speed setting. The one time I almost lost the plane, I was in the pattern to land, at about half throttle, when bang, glitch. Another time I just pulled out of a loop and brought the throttle up. And at other time just before touchdown. It's a handful, but so far, no major damage.
As for the xmitter, it's a JR8103, with 4 other planes on it that perform just fine. I'll keep trying. Either resolve the porblem, or loose the plane.

Bob

4 or 5 cell RX pack?

Since this idea is considered to be illegal in the U.S. I can't suggest it, but if you were to change the rx and tx crystals you might find the cause. I have seen tx modules start to do some wierd things, and a change in channel number seemed to clear up the problem. Of course if that is the problem, the module should be changed or sent in for retuning.

Changing RX crystals is not illegal.

I have a very similiar problem, with similiar hardware, Please look at my thread
http://www.rcuniverse.com/forum/Odd_...1958395/tm.htm
and see if it may help you out.

Well bobinma thats interesting.
Different surfaces though. I don't have a throttle problem or rudder problem, I am assuming it is the ailerons, however, I guess it could be something else. The rudder on my 540 really doesn't turn the plane up into a bank. Makes for great knife edges if I can keep it in the air long enough. I'm sure it's the same on your plane. As I stated earlier in the string, I've eliminated all the things I thought it might be. Anything metal to metal is tight.
I too have flown on channel 34 for years with no problems, and have other planes on this radio that perform flawlessly. If I figure out what is causing this, I'll let you know.

Bob

Two areas you might investigate. 1 Check your mixings on your transmitter, one may not be in the inhibited state. Also check your wing assignment mode. 2 Re-setup your plane on another model number. Don't copy, you may copy some error that is hiding from you.

Good Luck
Fitz

Had the same problem with a Pacific Aeromodels edge, It would just start rolling for no reason. Found out it was the y connecter. Anytime any pressure was put (minor that is) on the split point it would activate the ailerons. Switched it out and have no problems./

OM, just to try something from a COMPLETELY different angle...have you checked the incidence (with an incidence meter..don't trust your eye) setting of both wings relative to the thrust line of the plane? I am wondering if your problem is elctrical or radio at all, and might not be structural. Reading your comment that it does it at different times, but specifically you mentioned at the bottom of a loop (pulling elevator) and also when landing (higher angle of attack...also pulling some elvator), I am wondering if you might not be seeing a snap, as the right wing stalls first. If the incidence is slightly more positive on the right wing, or your aileron is drooped slightly on your right wing...or even if the plane was grossly out of balance laterally (right wing heavier). All of these things could make the plane snap 90 degrees to the right when you did something in flight to increase the angle of attack enough that the right wing might stall first.

I have a Lanier 1.20 sized Edge 540 that acted somewhat similar until I realized that the big honker ST 3250 mounted on it's side (along with a big muffler) was making the plane WAY out of balance laterally. Once I put some stick-on weights on the opposite wing tip to balance the plane laterally, the problems went away.

Just something else to consider!

Lee

Good point Lee....Just 2 weekends ago, the entire LE covering on my Cap-X came loose and initially I thought I had a radio problem such as stuck or glitchy servo. It was very squirrely and wanted to roll over on it's back at low speeds and/or high AOA. Turns out it was this flap of covering that would trip the air up over the right wing and causing a very nasty "tip stall". Almost did not get it back to the field it was so nasty.

Richard

Just out of curiosity...What did you do with that plane because I purchased one from a guy...not you....and it does the exact same thing. Oh by the way mine goes right! My problem, after some pretty scary events, is a significant misalignment of the trailing edge of each wing half causing the right wing to stall alot sooner than the left wing. It acts just like hard right aileron, at any speed, coming out of a dive, loop, fly straight and pull up hard and the right wing stalls and she banks hard right. I changed servos, channels, frequencies, batteries, and more. Very dangerous on landing. Unfortunately the seller told me it flew perfectly. Maybe he bought it from you and sold it to me. Now I have a new wing and am in the process of putting it together straight. If you still have yours take a good look. My leading edges line up straight but if you tape a Steele rod to the trailing edge of each wing half, the tips of the rods should be in the same plane. My right wing half trailing edge is about 3/4" lower than the left half...right wing stalls first EVERY-TIME! Good luck!

Might sound crazy but I think it is a tip stall .... I had one and others at our field did also.. and that plane, if it is heavy (should be about 11 lbs.or less) will tip stall and high speed stall ... just fall out of the sky ,,,
go to this link and take note [X(] http://www.troybuiltmodels.com/Lighter.htm

Well guys I have to jump in here. I also have a H9 Edge 25% and have been haveing a similar problem.. Not rolling but diving out of know where. It was doing it only on my right side at about 45 deg from my standing point and about the same alt.... Well I pulled the antenna out of a tube in the bottom of the fuse and ran it along the top of turttle deck and taped in down. Well all was cool last week then.. "Boom" I got the same glitch on the left side of me.....????? I'm still stumped.
I do have to admit I changed the TX crystal from the one that came with the radio ( A Brand New 8103) to the one I was runnig in my old 652. I was really starting to think it's the Radio.. and I was going to send it in for a tune job. But there are so many other possablities. ????
The plane is rock solid the rest of the time.
Here's what I have in mine.
JR 8103.. channel # 45
Hitec HS 5645 dig. all surface's
2 for the Elev.
2 wing
1 Rud...pull pull setup
1 537 thott.
180 Saito

By the way it also has done it a differant flying fields.

I'll for sure keep a eye on this thread... AND post anything I find to fix it.
Thanks Guys

Got a new wing from Horizon the other day. If I were to line up the root ribs on each wing half and glue them together the new wing would be exactly like my old wing....ie.. the leading edges would line up correctly and the trailing edges would be 3/8" out of alignment. the left half wing tailing edge is higher than the right half wing trailing edge...thereby causing the right half to stall WAY before the left wing. If you line up the trailing edges the root ribs are very uneven. Horizons response to my question to them was....send it back at your expense and we will send you another one at your expense....hmmmmm........go figure...