It is like a gear change, capable of biting more air as the air thins with altitude. Typically you reduce prop speed shortly after takeoff in the climb, recommend bringing it back to around 2,600RPM. As you reach cruise altitude you can then bring it back to around 2,300-2,400. In combat I believe most pilots set their RPM to 2,600 prior to entering combat.. slaming it forward will mean that you run the risk of over-revving the prop in a combat dive.
When diving, keep an eye on your RPM, normal practice is to make sure you reduce your manifold pressure (or boost) even in an accelerated dive to manage the prop.
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