Has the debate on revolutionary new fuel efficient propellers closed?

Question:
www.nzinvent.co.nz

Answers:

how many punks does it take to screw in a light bulb?

I didn't know there was a debate on this issue. It woould seem that propeller efficiancy is a good idea. Bird-Johnson manufactures this type of propeller for commercial applications. My experience with them is that the are great for going ahead, but don't produce a very good "back".

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