"Mark Hansen" wrote in message
...

If you reduce the weight of the prop, won't that move your CG aft?
Requiring less weight in the tail (actually, anywhere behind the CG) to
support the same flight envelope?

(Let's see, how can I gracefully get out of this one...OK, I know...)
Brain fart! Yes, you are 100% correct.

We would need to saw off tail structure to fix the CG. (just kidding)
Worst case, you would need to add weight as far forward as possible, and that
added weight would have to be MORE than the weight that you saved by swapping
the prop because it would necessarily need to be mounted closer to the CG than
where the weight came off (the prop).

Just to add a bit of noise to the discussion, an airplane operating at
maximum allowed aft CG is actually more aerodynamically efficient. Sailplane
pilots often add tail ballast for just this reason.



--
Vaughn


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You probably already have a news reader program in your computer (Hint: Outlook
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Will poofread for food.