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Message-ID: <1c23473f050718223677e2684b@mail.gmail.com>
Date: Mon, 18 Jul 2005 22:36:39 -0700
From: David Leonard <wdleonard@gmail.com>
Reply-To: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Surge, wastegate, Evans, and Anesthesia
In-Reply-To: <list-1058684@logan.com>
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In my last episode, I was battling compressor surge (stall) and going to tr=
y=20
to put a hole in the intake system to create more flow. The thought was tha=
t=20
would allow me to open up the throttle more, decrease the apparent pressure=
=20
ratio to the turbo (because of reduced throttle body losses) and allow for=
=20
more flow. No good... I made a hole working up to 1/2 inch in dia which=20
created a noticeable difference in throttle position for a given boost but=
=20
no improvement in the occurrence of surge.
 Well, I finally graduated my residency last week and now will be working=
=20
much less, including 3 weeks of vacation. The first of which I spent at the=
=20
hangar. I decided to just open up the wastegate.. I removed the flapper=20
valve all together, opening up the waste gate significantly. I was worried=
=20
that it might be too much and I would not be getting any boost. But with th=
e=20
flapper removed I still can make 40"MAP on take off, my RPM for a given MAP=
=20
is improved (probably because of decreased back pressure) and thermal=20
rejection may be improved as well. All in all it was a good move because my=
=20
limiting factor is still cooling.
 More stats later as I am flying to the mountains tomorrow... The wife is=
=20
even going to come along.
--=20
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/vp4skydoc/index.html

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<div>In my last episode, I was battling compressor surge (stall) and going =
to try to put a hole in the intake system to create more flow.&nbsp;&nbsp; =
The thought was that would allow me to open up the throttle more, decrease =
the apparent pressure ratio to the turbo (because of reduced throttle body =
losses) and allow for more flow.&nbsp; No good...&nbsp; I made a hole worki=
ng up to 1/2 inch in dia which created a noticeable difference in throttle =
position for a given boost but no improvement in the occurrence of surge.
</div>
<div>&nbsp;</div>
<div>Well, I finally graduated my residency last week and now will be worki=
ng much less, including 3 weeks of vacation.&nbsp; The first of which I spe=
nt at the hangar.&nbsp; I decided to just open up the wastegate..&nbsp; I r=
emoved the flapper valve all together, opening up the waste gate significan=
tly.&nbsp; I was worried that it might be too much and I would not be getti=
ng any boost.&nbsp; But with the flapper removed I still can make 40&quot;M=
AP on take off, my RPM for a given MAP is improved (probably because of dec=
reased back pressure) and thermal rejection may be improved as well.&nbsp; =
All in all it was a good move because my limiting factor is still cooling.
</div>
<div>&nbsp;</div>
<div>More stats later as I am flying to the mountains tomorrow...&nbsp; The=
 wife is even going to come along.<br>-- <br>Dave Leonard<br>Turbo Rotary R=
V-6 N4VY<br><a href=3D"http://members.aol.com/_ht_a/rotaryroster/index.html=
">
http://members.aol.com/_ht_a/rotaryroster/index.html</a><br><a href=3D"http=
://members.aol.com/vp4skydoc/index.html">http://members.aol.com/vp4skydoc/i=
ndex.html</a> </div>

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