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Date: Mon, 13 Jun 2005 07:44:25 -0500
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: normalized supercharger? Was Re: Is common sense
 dead (rant mode on)
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Michael LaFleur wrote:

>Oops, I've been called out!
>
>Having just come up with the idea lately, I hadn't
>much about the installation. My inclination would be
>to electronically control the wategate and have a
>popoff valve set a a couple psi over 1 atm.
>
>Mike L.
>

Here is where things get interesting.
 
Most automotive pop-off valves are set up and referenced to AMBIENT 
pressure. So.. at sea level, a few psi over ATM may be exactly what you 
want. The piston and spring push out against the ambient pressure and 
voila! Boost relief!
 
At 15,000 feet it may be in the neighborhood of 10 psi (thats WITH the 
"few psi" added in).
 
Aircraft automatic wastegates are referenced to a sea-level pressure 
that is in some sort of sealed chamber. Unless you get an electronic 
boost controller that is an "absolute pressure controller" and is 
referenced to sea level, or spend the $$$ to get an aircraft "automatic" 
wastegate actuator to control that blowoff valve, you likely wont get 
the normalization you are looking for.
 
Dave Staten