Reply-To: <jandre@nc.rr.com>
From: "Jeffery J. Andre'" <jandre@nc.rr.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: BOV more/less air flow
Date: Sat, 10 Jul 2004 10:08:16 -0400
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Importance: Normal

Pardon the abrupt de-lurking, but here's random thought for consideration in
the current discussion on boost control.

Would it be possible to have the bleed air from a BOV actuate a "manual
override" of the wastegate, opening it up to alleviate the overboost
condition from the exhaust gas side.

Wouldn't this create a self-regulating feedback loop?  You could set the BOV
for your maximum desired boost to protect the engine.  Since it doesn't just
pop fully open but opens gradually against a spring, it would also begin to
gradually override the wastegate setting to slow the turbine down, which
should mitigate the issues Ed described as problems with a BOV.

I certainly haven't thought this all the way through, and I'm not sure how
to go about building such an actuator, but I'm interested in comments from
the gallery.

Jeff Andre
Raleigh NC