Capt. Geoffrey Thorpe wrote:
"John" wrote in message
...
...
It's supposed to be fairly stable because the thrust reaction point is
well above the CG, so there is a strong pendulum effect. They claim
it's better than a helicopter.

An often made, completely wrong assumption - "pendulm effect" - ain't no
such thing for an object in free flight.

Early rocket experimenters often attempted use "tractor" engines
assuming that it would provide stability - Dr. Robert Goddard's first
liquid rocket is an example. It didn't take them long to figure out that
they were wrong.


So much for the roll stability advantage of high wing aircraft...

Perhaps the word should be controllability, not stability. Are you
saying the thing would have the same controllability with the thrust at
the top or bottom?