Re: Kitfox mishap in Colorado

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Subject:		Re: Kitfox mishap in Colorado
From:		Paul Franz - Merlin GT (paul@eucleides.com)
Date:		Thu Nov 27 - 7:16 PM

On Thu, November 27, 2008 2:08 pm, Lynn Matteson wrote:

> I really am serious about the question, though....what does beta mean
> in respect to props? (the dictionary exp. doesn't give me a clue)
> (Maybe if I got the additional 20 hours of flight training, I'd know
> this but I didn't and I don't.) : )

Propeller pitch can be specified in two different, but equivalent, ways. The first
is
the blade angle, and the second is the pitch. The two are related as follows:

        beta = atan( pitch / (2*pi*0.75*d/2) )

where beta is the blade angle, pi is 3.14159, and d is the propeller diameter.
Note
that the pitch and diameter must be specified in the same units.

-- 
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell