R c wrote:

I was talking to one of my larger buddies in regards to increasing HP of his
13b vs. shedding some weight off his plane.  Anyone know what the
correlation is between weight and and HP in a plane.  In other words how
much weight would one have to shed in order to realize the same performance
as increasing the HP of the engine?

I was scrounging looking for some curves on constant speed props and I ran into
this very interesting chart in Donald R. Crawford's book; "A Practical Guide
to Airplane Performance and Design. third edition available directly from the
author PO Box 1262 Torrance CA 90505 (310) 375 9227

IMHO this is a great way to illustrate the various trade off's. It shows
both the effect on climb as well as the effect on top speed. Note that
additional weight has very little effect on top speed but a large effect
on climb.

Paul Lamar

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