What prop??

[Nat Penton]

George Abbott has a nice artical in the Oct 86 MA on the subject of props 
and provides a graph that lets you compare props of any diameter and pitch. 
He says that pitch is a linear function in the power equation, not raised to 
the third power as I had previously stated.   Nat
----- Original Message ----- 
From: "Nat Penton" <natpenton at centurytel.net>
To: <discussion at nsrca.org>
Sent: Monday, January 17, 2005 12:09 AM
Subject: Re: What prop??


> 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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