ORIGINAL: Richard L.
ORIGINAL: bigbird007
Some where towards the begining of the thread Richard L said he had flown his "Tons of times in the past couple of years" and reported no problems, till later.
That is correct. I flew mine tons of times, but not at full throttle. Most of the time when I went to full throttle with the OS 120 four stroke in the nose, the rear stab would flutter. That was after the plane had around 20-30 flights. I do have a second Hellcat brand new in the box and will do things differently next time.
Richard, if I may add to your notes:
Control surface flutter is quite often encountered and is not the flutter of it's mating aerodynamic appendage ie it is of the elevator and not the horizontal stab. Both can ( and often will) flutter and requite different resolutions. Beefing up the aft structure per the preceeding threads should add significant help to stiffen the horizontal stab area. That being said, now about the elevator whose flutter can drive the entire mess! Here are typical causes of flutter, with some fix/prevention suggestions:
excessive air speed---fly slower
excessive gap between the elevator and the horizontal stab---seal the gap,easily done
flexible push rods---choose stiffer design
wrong control horn/push rod attachment---remember-long on the surface, short at the servo
weak servo selected--- go to a proper inch/ounce servo
In my own experience, items 1, 2, and 4 have at one time or another bitten me in the butt and have helped my learning curve. BTW, the above apply equally to the wing/aileron flutter.
I wish y'all the best and a Merry Christmas!!!
hookem