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Old 04-29-2008 | 04:35 PM
  #7  
da Rock
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Joined: Oct 2005
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From: Near Pfafftown NC
Default RE: Question About Elevation and Engines

Don't sweat elevation, temperature, whatever.........

At the start of every flying session, adjust the needle for optimum. Easy enough?

Our engines will tell you what you need to do, and you won't even know they're doing it. It's as simple as that 2nd sentence.

Crank the engine and let it warm up.
Go to wide open throttle.
Open the needle to insure that the engine is rich. No special degree of rich, just positively rich.
Close the needle to find max rpm, and then back off "enough".

You're done.


OK, how much is "enough". You'll get a feel for it after a couple of outings.
Every one responds differently. You'll normally richen any engine on the ground from it's max rpm needle some number of clicks. That insures a good mixture when the prop unloads in the air. When it unloads, the rpms go up and more air moves through the venturi. And more fuel is needed than when running on the ground. And you'll sort out how much each of your engines reacts from the ground to the air.

Easy to do. And since it should be done the first run of every outing, you'll be familiar with the process whenever you fly at a different altitude.