throttle and ailerons
 

I almost lost a 33% extra 330, when i got it to the ground i realized at full throttle my ailerons are going wacky. no other surfaces seem to be involved and i have done a range check, I've rebound the system and still have the same problem . i did a master re-set of the radio same problem. is it possible the ignition could be causing this problem? no movement at low to mid range, this only happens at wide open throttle. i had a 921 receiver and also a AR7000 and both do the same thing, any help would be greatly appreciated.

RE: throthel and ailerons
 

Did you check for flutter?

RE: throthel and ailerons
 

I don't think it could be flutter at 1 point they actually went to full throw I then had someone hold the servos an some how they are moving mechanicaly

RE: throthel and ailerons
 

So your servos are actually twitching?

Which engine? (well -which ignition really is the question).

Yes - it CAN happen - even with 2.4G
Also - check for the usual metal to metal contacts - including any metal pull pull cables rubbing (Don't ask how I know that).

Where do your servo leads run - Signals can be induced to a servo lead.
Are they "Twisted wire" servos?

Another strange one I saw once - is your muffler on properly - I had a similar issue once but it happened at low throttle - when I tightened the muffler bolts properly (It was an early model DL and it was My bad - I had it on crooked as part of a last minute rush), the problem went away.

RE: throthel and ailerons
 

Are you using a resistor type spark plug?

RE: throthel and ailerons
 

I've flown this setup 5-6 times with no problem, this is strange guess I'll start from scratch an rewire everything. BME 115, Rcexl ignition 8411s on aileron
resistor type spark plug NGK CM-6

RE: throthel and ailerons
 

The fact that you've flown it a few times alreday without a problem points to something coming loose.

Check all the simple things like clevises etc to make sure that something hasn't come loose and is causing metal to metal contact.

When you re-wire - follow all the rules about maximum separation from ignition to radio gear - even with 2.4G it is a good practice to follow. Try using an FM receiver to test it for range etc - if that doesn't get interference - you are assured of being safe for any other type of receiver.

RE: throthel and ailerons
 

Are the plug caps pushed all the way onto the sparkplugs and are the sparkplugs tight in the heads?

RE: throthel and ailerons
 

Get rid of the Spectrum radio. This kind of problem turns up all the time but you guys stay with big S. [:o]

CR

RE: throthel and ailerons
 

QUESTION...Is the Futaba Fast system OK, or maybe a tad better in some cases? Thanks Capt,n

RE: throttle and ailerons
 

OMG.
There is NOTHING wrong with the spektrum radio. Please take your flames somewhere else.
Are your ailerons on a Y, or are they into separate channels? If it's a Y, then maybe the connection at the Y is loose?
Re-wiring everything should help. make sure you have plastic somewhere in the linkage from the throttle servo to the engine, and that it is not all metal to metal to metal...
Stuff that I'm sure you know...

RE: throttle and ailerons
 

Why ask me all these questions? My airplanes fly fine. They don't develop the Spectrum" problems that I read about either. Every time I turn around I read about a "Spectrum lockout" crash. Or a "reboot " jitter/crash. Why anyone buys crash-prone Spectrum gear is beyond me.

CR

RE: throttle and ailerons
 

I have never had a problem with my DX7 Radio

RE: throttle and ailerons
 

Spektrum, PCM, FM....everyone should be range testing their setup regardless. Though this plane once passed, and flew successfully, it now no longer passes the checklist, let alone the checklist while range testing.

As suggested earlier, check all of your fittings, no metal to metal contact, nothing loose. Check your ignition by either holding each cap boot while the ignition is powered on to see if you get zapped, or kick it on in a completely dark room and look for spark around the boot, if properly grounded it will only go through the plug, and not venture elsewhere. Nothing ignition related routed anywhere close to RX driven equipment, like switches, batteries, leads. Remove and/or replace servos, leads, Y's, etc one at a time with a retest in between. If you have a spare ignition and switch to test, do it. Or bypass the ignition switch and test...

Thankfully your plane gave you warning of something wrong, that you can diagnose and repair. Also, I've been using the same technique as Aussiesteve, setting up and range testing with an FM rx, once passed, it all is retested with the RX I plan to fly. Keep us posted, we'll keep helping you narrow down what it could be, and we'll be interested in hearing what resolves the problem for you.

Chad

RE: throttle and ailerons
 

I cant let this go. I dont have problems with my spektrum. There are plenty of guys flying jets on spektrum in our club. No problems there either.
Edwin

Every mfg has a problem now and then. I see no difference in the numbers to other mfgs and no correlation to my observations and experience with spektrum.

RE: throttle and ailerons
 

well my xp9303 just came back from the aileron wire fix I plan on rebinding it tonight, also I did notice my throttle linkage at WOT is touching the edge of the muffler will put some carbon fiber over the rod an hope that was it . Thanks fro all the input will keep informed

RE: throttle and ailerons
 

I would do something creative to avoid any touching at all....don't just put something between the touching components. If you are putting a sleeve of carbon over the rod to avoid flexing, which is causing the touching...good plan. Definitely let us know, crazy how simple this stuff can be.

RE: throttle and ailerons
 

Carbon fiber is conductive just like metal. Best to move your linkage so there is no chance of it touching something.

RE: throttle and ailerons
 

Man...hit twice from the guys in IA.... :)

RE: throttle and ailerons
 

Right I moved the linadge rerouted all wires an still have the problem, so I will start with the throttlt servo change it out then go to ignition If that don't work I'm clueless

RE: throttle and ailerons
 

I would unplug each servo one by one and see which one may be causing the problem....if any. If that doesn't help and you have no loose metal parts vibrating you may have an ignition problem...ie loose spark plug wire etc...

Could be a bad servo extension too. Bad battery extension....bad switch....

RE: throttle and ailerons
 

Maybe turn out the lights and turn the prop over with a starter if you can. Look for stray sparks. An old trick I learned from some snowmobil relatives many years back.
Edwin

RE: throttle and ailerons
 

Edwin,
Just curious, do you get to do lots of snowmobiling in Texas?:D
kidding
Darrol

RE: throttle and ailerons
 

LOL....man you guys....too funny. Thanks for that. :D

RE: throttle and ailerons
 

I was'nt going there LOL. mounting ignition do you guys use foam under the ing. ?