Adjustable Prop for a Cessna 150

"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


Nothing personal, but if you are posting through Google Groups I may not receive
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Will poofread for food.

Actually I think it was determined in the sailplane circles.. that having
the CG at the 85% point was the most efficient..
too far aft was too much and caused nose down stick putting the elevator
down into the slip stream, and not far enough aft caused back stick or up
elevator into the slip stream.
Heavier pilots do add tail ballast which increases the minimum pilot weight
for club gliders.

BT


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