Twotikes@aol.com wrote:

Here's a picture of my nominee for the title "lowest propulsive efficiency".
At least 50% of the prop disk is blanked.  13 years and three prototypes and
this is the best they could come up with.  On a positive note: tests were
conducted to evaluate the effect of the spinner.  The result: It looks better
with it on ;-)

Jeff Spitzer

 
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