<... The original prop was a 64 x 78.  I replaced it with a 62 x 72, same manufacturer. Should take less power to swing it, which one would expect more rpm’s?  Paul Conner ...>

That pretty much HAS to turn faster.  If you have a friend with same prop hub as yours, have him try both props and see (as a percentage) how much more rpm he can get on the smaller prop.  If he gets 15% or 20% more rpm with the smaller prop and you don't, you're back to trouble shooting and tuning your fuel control.

My best guess ... Jim S.

Paul wrote:

 

 

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy
Sent: Tuesday, January 11, 2005 10:29 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: props again

 

Well, I installed my new prop today, hoping for higher rpm’s.  I mistakenly assumed that by installing a smaller diameter prop with less pitch, I would gain engine rpm’s.  Wrong.  I am still stuck at 4800 rpm’s, big prop or little prop.   

 

How different are the props supposed to be?

 

Rusty (where's my pizza) 

 

The original prop was a 64 x 78.  I replaced it with a 62 x 72, same manufacturer. Should take less power to swing it, which one would expect more rpm’s?  Paul Conner

 

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