RE: Do props destabilise Aircraft??
Bored?
Towing an object is more stabilizing then pushing it
Ever try to push a length of chain?
As for CG calculators
The lighter the wing loading - the more tolerant the CG position-
Stability is a moving target -
stable in what attitude?
a highly aerobatic plane will be more stable in high ALPHA flight -IF the CG is extremely aft
yet - the same craft will be twitchy if flown at a very low AOA
Don't believe it ?
try it .