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Date: Thu, 11 Sep 2003 21:36:42 -0400
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: turbo wastegate requirements
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<... That ambient pressure outside certainly needs to be accounted for ...>
OTOH, the back-and-forth between Rusty and I and others seems to indicate that 5 or
6 psi (or 10-12 in Hg) is all the boost anyone will reasonably need.  So a popoff
valve set for 5 psi and forgotten would allow us to take off with 35" (in the
unlikely event we needed that much power) and turbo normalize to 15 k ft so it
would seem that a really dumb popoff valve would work OK.
Just a theory .... Jim S.
--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T


Marvin Kaye wrote:

> Jim Sower <canarder@frontiernet.net> wrote:
>
> >>>The pressure trying to OPEN the valve is MAP applied against the inside face
> of
> the valve.  The pressure trying to CLOSE the valve is spring tension PLUS
> ambient
> pressure applied on the outside face of the valve.
>
> You will have to somehow compensate for the ambient pressure outside the valve
> <<<
>
> You're absolutely right.  Shortly after I hit the send button I realized the
> folly of my ways <G>.  That ambient pressure outside certainly needs to be
> accounted for.  Back to the drawing board.
>
>   <Marv>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html