Paul:  Don Crawford was a member of the "Design Group" that met in the
SF valley during the eighties and he did a lot on prop studies.  The
"Design Group" is starting up again at Flabob apt in Riverside CA  and
the next meeting is in Jan with Don doing the presentation.  Don is a
great resource for aerodynamics; he is not a motorhead though.

BY



Hi Paul:  from now it will be Bob Y in lieu of BY.  Don's address is:

crawfordaviation@earthlink.net

I like his book.

Paul Lamar ...No rotor no motor.

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