From RC Helicopter Wiki
Altitude can refer to:
- The height of the helicopter above ground level.
- The height of the ground above sea level (and thus the density of the air; see density altitude).
- Or a combination of both---the height of the helicopter above sea level.
Generally the only thing a model helicopter pilot cares about while flying is height above ground level, which it is best to keep positive. However, height above sea level, and so the location of the flying site will affect how well the helicopter flies, and the efficiency of internal combustion engines.
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