I fly at an elevation of 7000 feet. I have noticed that I seem to get about the same prop speeds on my engine/prop combinations as everyone else flying at lower elevations. I assume that two factors are working at the same time:

1. The air is thinner, so the engine has less power.
2. The air is thinner, so the prop has less resistance.

These two factors seem to equally offset eachother, so props seem to turn the same speed. independent of elevation. Needle valves do need to be set a little leaner here (I think).

Any comments?