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From: Hans Conser <conserreceipts@earthlink.net>
Subject: Re: [FlyRotary] Surge, wastegate, Evans, and Anesthesia
Date: Tue, 19 Jul 2005 09:20:31 -0600
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>


On Jul 18, 2005, at 11:36 PM, David Leonard wrote:

> In my last episode, I was battling compressor surge (stall) and going=20=

> to try to put a hole in the intake system to create more flow.=A0=A0 =
The=20
> thought was that would allow me to open up the throttle more, decrease=20=

> the apparent pressure ratio to the turbo (because of reduced throttle=20=

> body losses) and allow for more flow.=A0 No good...=A0 I made a hole=20=

> working up to 1/2 inch in dia which created a noticeable difference in=20=

> throttle position for a given boost but no improvement in the=20
> occurrence of surge.
>  =A0
> Well, I finally graduated my residency last week and now will be=20
> working much less, including 3 weeks of vacation.=A0 The first of =
which=20
> I spent at the hangar.=A0 I decided to just open up the wastegate..=A0 =
I=20
> removed the flapper valve all together, opening up the waste gate=20
> significantly.=A0 I was worried that it might be too much and I would=20=

> not be getting any boost.=A0 But with the flapper removed I still can=20=

> make 40"MAP on take off, my RPM for a given MAP is improved (probably=20=

> because of decreased back pressure) and thermal rejection may be=20
> improved as well.=A0 All in all it was a good move because my limiting=20=

> factor is still cooling.
>  =A0
> More stats later as I am flying to the mountains tomorrow...=A0 The =
wife=20
> is even going to come along.
> --=20
> Dave Leonard
>

Congratulations Dave on finishing your residency.

"There may be unnecessary surgeries, but there is never unnecessary=20
anesthesia"

Hans Conser