Originally Posted by inventor121
I got a Fms 1100mm j3 cub for Christmas and the first time I tried to fly it the plane it flipped over to the right and crashed upside down onto the ground.
the motor shaft broke and the motor was replaced and there was no other damage. later I found out the right side of the elevator was moving further than the left side. so i glued the two sides of the elevator together more securely and that seemed to fix the problem. later i tried flying again and it rotated right again but not as severely it was flying for about 10 seconds before it was sideways and it crashed to the ground again. miraculously the was no damage this time!
I have not tried to fly it since.
any help would be appreciated,
Yeah, make certain your wing is not warped. Place the model on a table or similar, walk in front of the model 5 or 10 feet, and align your vision such that the bottom of both wing panels and the motor and rudder are all aligned up.
If your wing is warped sufficiently to cause flight problems, you will be able to see it. How much is to much? An 1/8 inch warp at the wingtip is not good, 1/4 inch warp is really not good. And, while you're at it, also check the horizontal stab alignment from the same position. The leading edge of the horizontal stab should be slightly lower that the trailing edge, again from the same visual location as above.
If that looks OK, then it's time to find an experienced modeler to check out your airplane.