In article ,
T o d d P a t t i s t wrote:

"Kev" wrote:

You can't design out P-factor or torque,

Actually, if you really needed to, you probably could design
them out, or at least reduce them significantly. But only
if you wanted an aircraft that was so expensive no one could
afford to maintain or buy. As usual, the cost/benefit says
it isn't worth it and you'd probably add a host of other
problems. (Kill P-factor by sensing relative wind and
pivoting the engine to keep it aligned, kill torque effects
by contra-rotating props)

You could design out P-factor by using a prop with a cyclic pitch control,
like on a chopper. Wouldn't be worth doing, but it's possible.

That's the hard part of engineering. Not figuring out what's possible, but
differentiating between the possible and the useful.