ORIGINAL: combatpigg
I wonder if those servos are overloading the battery pack during the hard manuever? Those servos are plenty strong, IIRC they're what I'm running in my fastest delta. I've got no experience with lipos and BECs, too high tech for me.
I do know one thing.......problems like this rarely straighten themselves out on their own. Consider yourself fortunate. I would get a big honkin' nicad or nimh pack and go with that. I would also exercise the controls while exerting pressure on the flaps. If you plug a voltmeter in while you check the controls under force, make sure the voltage isn't dipping below 4.8
One thing I noticed on my Demon #1 model, is the the two elevon servos don't move at precisely the same rate. That probably means I should remove them immediately and relegate them to throttles, but letting that go for the moment, I notice a good wing dip on fast application of elevator sometimes. I doubt this is the same issue as BB presents, but just thought I'd mention it. It points at the servo in any case.
Is the roll constant, i.e. as long as you hold elevator it rolls? There are deltas flying around on HS-225's and honking .50's and aren't having problems. With the servos you have you shouldn't even need hinges.
Sure sounds like flex of the control surface or a FUBAR servo as CP suggested. Hope you iron it out before it fixes itself..
I remember making tubular bells with my nephew who was a university music student at the time - if you suspend a tube or rod or bar at the 40% length point, that is an anti-node and will damp any fundamental resonance immediately if you ring it. I can't help thinking that might be a prime spot for a control horn. At 23%, it rings forever at the fundamental frequency and I don't think I'd put the horn there - that's where you hang wind chimes for example. Airflow of course doesn't enter anywere into that math.
MJD
MJD