Well, well, well.......The second maiden flight after the reconstruction due to an earlier crash. Thewetaher couldn't have been better, clear blue sky, no wind at all, comfortable temparature....Needless to say, the aircraft crashed. I started the takeoff roll, when the aircraft was in the middle of it, the engine lost RPM and recovered soon after, well that's no problem. Got at take off speed, pulled up. The aircraft climbed fine for some 3 meters, then all of sudden it banked hardly to the left. I managed to recover, and since I was very close to the ground and with a lot of runway left, I cut throttle to idle and leveled it to land and see what happened. Then again the aircraft banked violently to the left and *crash*, it landed upside down. Damage wasn't very extensive because it hit very soft land. But was enough to separate the wing and break the right tip LE, and the ply engine housing up front. Also the main gear was ripped of (I don't know why, since it landed upside down......).
After analysing the crash video (sorry but I don't have how to digitalize it
) two things come to my mind as the reason to the crash:
- Radio interferency
- Left aileron servo failure.
For now, the most reasonable reason is radio interferncy. Although noone was at the field, and for some 5 miles I don't know of people having R/C models at home, the interferency could have been caused by 4 things aboard the aircraft:
The copper tube wing joint, the steel screw holding both wings together, the 300 grams of nails in a masking tape package (used for ballast) , and the Z-bend at the throttle arm.
The main reason for me suspecting the radio interferency, is that the right aileron was deflected all the way down, causing the bank, without me giving the command to it be like that, and the throttle incident at the take-off roll.
Here's a picture of how it landed