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Re: [OM] Re: olympus-digest V2 #3611

Subject: Re: [OM] Re: olympus-digest V2 #3611
From: "Gary Edwards" <garyetx@xxxxxxxxx>
Date: Fri, 20 Sep 2002 22:17:33 -0500
Though some use the term, it is used incorrectly.  Propellers can stall or
can suffer performance reducing transonic effects, but they cannot cavitate
in air.  Separation is bad because the local pressure then approaches static
pressure, not vacuum.

Gary Edwards

----- Original Message -----
From: "David McGriffy" <david@xxxxxxxxxxxx>
.
>>
> They talk about props 'cavitating' at Reno all the time.  I have wondered
> at times what they mean.  I assume it is something like complete flow
> separation from the prop blades resulting in near vacuum.  I'm curious if
> anyone knows more.  Of course, their problem is that they are trying to
put
> 3500HP into a prop built for 2000HP.  Someone said that they don't bother
> with nitrous because the prop is already cavitating at full boost, which
is
> something like 120-130 inches.  Of course, this is a realm that no Cessna
I
> know of plays in.
>
> DMcG



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