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How to figure out why your freshly created aircraft "crashes" before takeoff?

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I am creating an aircraft from scratch for the first time. Yes, I know that most people probably start by modifying an existing one, but what is exciting (from a coder/hacker point of view) in that? Plus, the one I am building is fairly different from the existing ones. (It is a fantasy creation, that could exist in reality, but would probably not be economically feasible, and have very limited flight time for instance.) Also, I feel I learn better if I have to actually know what all the things that I need to tweak mean.

Anyway, what I am attempting is a manned quadrotor aircraft, with four (ducted) rotors (fans) in its corners. I will also have to write a plug-in to handle the continuous individual throttle adjustments to keep such an inherently non-aerodynamic aircraft hovering and moving. Just as a real-life quadcopter (drone) works. That is where the most interesting stuff in this attempt will be.

But the problem is that the aircraft "crashes" before even taking off, just while standing on the runway. With "crash" I mean that the windscreen that X-Plane displays in the default dummy cockpit view cracks and the flight ends there, not that the program would crash.

Is there any way to figure out what X-Plane thinks is wrong, why does it deduce that the aircraft has "crashed"? As far as I can see it is just standing on the runway, for some reason rocking gently, and then after a few seconds, boom, the windscreen is shattered. (It doesn't even fall over, so the problem is probably not that the landing gear or center of gravity would be weirdly configured.)

I have pressed Shift-M a couple of times before it "crashes" and looked in Cycle Dump.txt, but it doesn't contain any good clues. Attaching the Cycle Dump.txt anyway in case somebody sees something significant.

Thanks in advance. Hope this forum lives up to its name.
 

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