I feel disappointed to describe a miserable diary this morning.
46 motor powered fun-fly model airplane fell down and destroyed into pieces yesterday.
Immediately after taking-off unusually strange sound was discerned, taking right turn then I saw left side aileron withdraw, however hard I might try to control every motion, all the lever on the transmitter could not cause any action on the airplane.
At the moment when the airplane exceed the specific airspeed after taking off, the most awful phenomena, "Flatter" occurred, the strange noise I heard at that time was nothing but Flatter especially caused on the left side aileron portion.
Remembering that moment, what kind of countermeasure could have been done by myself, closing the throttle valve to reduce airspeed? Is it possible to do that when the airplane wants to depart from the ground as high as possible?
Generally, Fun-fly models are designed to obtain less weight if some constructive strength is lost, so wings especially moving wings have tendency to be easily
distorted when some controlling power by the servo is applied. This is why the weak constructive designed has the danger to cause Flatter phenomena.
Less air-speed even in taking off situation, prevention on the moving wing distortions. Those are the conclusion by the Model aircraft Investigation Committee.
As a least comfort, almost of the equipment inside of the airplane were recovered alive except the Rx battery.