On an aircraft with a constant speed prop, you set the rpm with the prop control, and the engine manifold pressure with the throttle.
To get a high manifold pressure you would set a low RPM with a large throttle opening.
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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