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Also in the spitfire manual it says that in a dive they could do a little over-rev,
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The Spitfire manual does not say to over-rev the engine in a dive. It says to keep the throttle 1/3 open in a dive to maintain 3000 rpm. Do not use the propeller rpm control to maintain rpm, adjust the throttle (manifold pressure) to maintain rpm.
That the correct way to operate a constant speed propeller while maneuvering in any aircraft. You adjust manifold pressure to maintain rpm. On many manifold pressure gauges, a green arc is provided to assist the pilot in keeping the engine within limits to maintain that required rpm while maneuvering.
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