[Alberg30] Prop for GM25

[John Birch]

Lokman,

13x7

Pitch is, imagine you were turning your propeller through a viscous medium
like soft butter - the distance the block of butter would move as the prop
cuts through without cavitation in one full rotation. The pitch measured in
inches - the propeller - would advance 7" in one full rotation.

13" is the diameter - allow 10% tip clearance of the diameter to avoid
crevice corrosion on a 2 blade, 15% on a three blade, from any part of the
hull - though why you would have a 3 blade on a sailboat is beyond me ; )
that should get some comments ; )

Its been a long winter up here ; )

John

----- Original Message -----
From: Lokman Abdullah <abdullah at bwr.eastlink.ca>
To: <public-list at alberg30.org>
Sent: Friday, February 09, 2001 8:51 PM
Subject: [Alberg30] Prop for GM25


> Hello all,
> I'm looking at replacing the prop on Phoenix. She has a GM25 Sea Sprite.
Any
> suggestions, directions, etc. would be greatly appreciated. Please excuse
my
> ignorance. What is "pitch"? What does 13X7 mean? If I don't ask, I'll
never
> know.
>
> Many thanks
>
> Lokman
> #81
>
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