> >
> > > From Valley Engineering (Culver Props): The efficiency of a propeller
> is reduced as the tip speed approaches the speed of sound. Beyond 80% of
> the speed of sound, further increases in RPM has little effect on thrust.
> Thus, it is important to keep tip speeds below 7
- Original Message -
> From: JL
> Sent: 05/09/14 11:12 PM
> To: Jeff Scott, KRnet
> Subject: Re: KR> Fw: Re: Propellers
>
> Jeff,
>
> Since I don't disagree with almost everything you posted, I suspect we are
> commenting about the same elephant, but from
ll
provide more thrust for initial take off and climb.
-Jeff Scott
Los Alamos, NM
<http://jeffsplanes.com>
> - Original Message -
> From: schmleff . via KRnet
> Sent: 05/09/14 11:39 AM
> To: tommy waymack, KRnet
> Subject: Re: KR> Fw: Re: Propellers
>
>
want. Everything on a
> prop is a compromise. Within reasonable limits a lower pitch, longer prop
> will provide more thrust for initial take off and climb.
>
> -Jeff Scott
> Los Alamos, NM
> <http://jeffsplanes.com>
>
>> - Original Message -
>> From: s
Not to start an argument, but I have to disagree ; )
How a prop works on a particular airplane is based on the amount of
air moved (past the cowl, not smashing into it) and the velocity of
that air. I have never been able to find a real reference to the
?large diameter prop=better climb? theory no
The longer the prop the better climb performance of the aircraft.The magic
of prop science never seems clear.That maybe why we call it
EXPERIMENTAL.And yes I do learn a lot from it.Tommy W.
On Thu, May 8, 2014 at 12:12 PM, Randall Smith via KRnet <
krnet at list.krnet.org> wrote:
> Every prop I
Doran Jaffas wrote:
> Just curious if anyone has run a 50 inch propeller. I have a 52 by 47 and
> am thinking of trimming it down to 50 inches the add a couple of hundred
> rpm.
My experience with a 2" difference in prop diameter and no other change is only
in the neighborhood of 50 to 70 rpm i
Every prop I have cut had given me 100 rpm per in up to 3".
Sent from my iPhone
> On May 8, 2014, at 11:44 AM, "joe.kr2s.builder at juno.com via KRnet" at list.krnet.org> wrote:
>
> Doran Jaffas wrote:
>> Just curious if anyone has run a 50 inch propeller. I have a 52 by 47 and
>> am thinking
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