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Subject:Re: Altitude Sickness and Buzzing alarm.
From:Richard Jones
Date:Sun, 27 Mar 2011 18:37:33 -0600
Your engine loses power at altitude.  The formula is
% HP loss = (ALT x 0.3)/1000
At 5800' here in Glenwood Springs, that means 17%.

Your engine sounds tired from your description.  Factor
that in with the above and take it easy.

Richard