>Can you give us an
>idea of what magnitude of performance 
>change we would be looking at if the
>weight of an airplane varied say plus 
>or minus 10% (20% total weight
>change.) Are we talking sink rate 
>improvements of 1/2 of 1%? Or more on
>the order of 20%?

A +10% change in weight will roughly produce changes of...

 +1%  in L/D
 +4%  in minimum sink rate
 +5%  in min-sink speed
 +5%  in best-L/D speed
+10%  in turn radius at a given bank angle

- Mark
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