The reshaping shown is very similar to a current trend in wing tip

shaping

in which the trailing edge is longer than the leading edge. The approach
is to reduce tip vortice losses, and is probably equally applicable to
props. The reduction in noise would seem to be an indicator of some
improvement. As an interesting aside, the Sensenich metal prop for RV's
for the O-360 is a reverse of this - tho the prototype was the long
trailing edge - they maintain there is no difference? (tooling
mistake?) - Vance

Vance,
If you cut through a section of an airfoil at an angle you get a longer
sleeker airfoil - the way in which the air sees an swept back wing airfoil
which is much more efficient in higher speeds.
Similar properties do you think, in relation to drag as the prop approaches
the speed of sound.
George ( down under)

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