| Re: [GMCnet] 4.8 MPG [message #324232 is a reply to message #324184] |
Fri, 22 September 2017 17:31  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma:
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Senior Member |
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It's way easier in the airplane - it's running at constant RPM and constant load. You're going to lose ~~ an inch of MAP per thousand feet of altitude, the mixture needs to lean to make up for this anyway. Rule of thumb is 50 degrees below max EGT. The auto engine sees constant changes in speed and load, and thus wants a computer to keep up with what's going on in a near instantaneous manner to keep from breaking something. I've seen the result of rejected landings where the pilot didn't do the GUMPP check and cobbed the engine and climbed out with the mixture set for cruise some several thousand feet up. It breaks things.
--johnny
(GUMPP - prelanding check mnemonic - GAS UNDERCARRIAGE MIXTURE PUMPS PROPS)
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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