What prop??

[Nat Penton]

Terry power is proportional to diameter to the 4th power and pitch to the 
3rd power. This would call for a 13.5 three blade to replace the 15 two 
blade. I have been experimenting with cutoff oversize props. This lets you 
get the loading with wide blades and cut the noise with lower tip velocity. 
I believe the efficiency is higher than the 3 blade ?? We always tend to 
high aspect ratio but I believe this may be a better way to go when noise is 
a consideration.       Nat
----- Original Message ----- 
From: "Terry Terrenoire" <amad2terry at juno.com>
To: <discussion at nsrca.org>
Sent: Sunday, January 16, 2005 9:10 PM
Subject: What prop??


>I have decided to go with the YS 91 in my Excelleron, but the spinner I
> have that fits is for a 3 blade prop. I have had very good performance on
> the 91s with a 15x8 APC. Can someone convert that to 3 blade for me?
>
> Terry T.
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