Generators used in high altitudes

road-runner wrote:

Jetting just trims the fuel to match the lower volume of available air at higher altitude. It will not gain you any power unless it is running so rich it will not run well. In that case, jetting will only get you to the point that Chum Lee mentions above.

I think anybody who flies a gasoline powered airplane will disagree with this statement. The rich mixture engine runs smoothly at high altitudes, and has a very noticeable power increase when the mixture is leaned out. As would be expected, fuel consumption also goes down.

I am a licensed pilot and have worked on small engines all my life. When a pilot leans the mixture as he gains altitude, he only gains a small but noticeable amount of power because he is getting the mixture right for the altitude. That power will still be less than he would have at a lower altitude with the proper mixture.