wrote:
On May 5, 1:06 pm, Scott Skylane wrote:
As an aside, the drag created by a windmilling propeller, i.e. one not
feathered and attached to a dead engine, creates as much drag as a flat
plate the same size as the area of the prop arc.

Nope. The blades cannot be everywhere at once, and so the area
affected is no larger than the blade area.

Dan

Yep.

If the prop is stopped, then the area is the blade area.

Look up the derivation and proof of Betz' Law, which deals with the
energy to be derived from a wind turbine, which is what a prop becomes
when it is windmilling.


--
Jim Pennino

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