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Old 07-26-2018, 04:52 PM   #11
pmdec
 
Join Date: Nov 2006
Location: France
Posts: 490
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Quote:
Originally Posted by jschoppaul View Post
Hello,
Thanks again for all your help.
1) Yes, it is a solid wood propeller, no laminations.
2) It does look like it was used. There are hub markings from compression, tip damage ( slight ), and leading edge wear.
I tried to measure pitch. Bear with me on my math.
I used to formula of:
PITCH = 2.36 x diameter height / width.

I measured “diameter height” of 1 7/8” or 1.875” at the 75% mark.
I measured the “width” at the 75% mark as 7 3/8”, or 7.375”
So, 2.36 x 1.875 / 7.375 = .6

Does this sound reasonable?

Thanks again for everyone who is trying to help. Even an “age” range would be nice.
John Schoppaul
Hi, I do think the pitch you measured is (meters):
pi x 0.75 x length x 1.875/7.375, that is 3.14 x 0.75 x 2.10 x 0.25 = 1.25 (= 49.4").

What I have in mind was not measuring the "true" pitch of the prop, but measuring it at different distances, say (from center) at 10, 20, 30 and 40" from the center. If it is a real prop, the pitches have to be quite the same.

Regards,
PM
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