Originally Posted by
EasternATC
Jumpseating once in a DC9 that powered back, I asked this question, and was told that it was an urban legend. Kind of makes sense, as a proper CG will be always be ahead of the main gear.
Can't speak to the DC9, but the E-2 would stand on its rear if you hit the brakes backing up. Especially if wings were folded giving you a very aft CG.
Height of CG factors into the tendency to stand on tail, not just fore-aft.
If your CG is only 1 foot forward of the MLG, but the CG is 4 feet ABOVE the rotation point (tire on single axle, truck pivot on a double axle truck), any braking applied via wheels above about 1/4g will start the nose up, and as the nose goes up, the distance from the CG to pivot decreases, further reduces the 'put nose back down' moment and will eventually hit the point where it will sit on the tail no matter what you do.
We stopped rearward motion by taking props out of reverse.
Add in heavy deck motion and it would get interesting.
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