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Standard day sea level pressure is 14.7 PSI or 29.92 inches of mercury. 1 inch of mercury is .49 PSI, 2 inches is .98 or ~ 1 psi.

Brian Trubee

-----Original Message-----
From: Michael McMahon <afm528@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, Feb 17, 2011 12:35 pm
Subject: [FlyRotary] Re: Pressure increase from ram air

Please forgive me if this is obvious, but is it possible to convert 2” of mercury to X lbs. of boost, as in a turbo? I’d love to see the math if anyone can show me.

Thanks,

Mike

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy
Sent: Thursday, February 17, 2011 11:09 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Pressure increase from ram air

Yes, 2" of Hg, but that was at top speed when racing (224 mph), not cruise. My ram air inlet is about 1" behind the prop which may affect the amount.

Tracy

On Thu, Feb 17, 2011 at 1:33 PM, Ernest Christley <echristley@att.net> wrote:

Tracy, you've said before that you can estimate 2" of pressure increase
from ram air at cruise. Is that 2" of mercury?

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