![]() Then, careless pilot snaps the throttle closed. The cylinder heads (which are very air cooled) are properly expanded. Consider an air cooled engine happily developing 75% power on a cold winter day in cruise flight – it’s being air cooled with cold winter air, exactly as designed, it’s making heat, which is being taken away exactly as designed, and the whole engine is in it’s nice temperature equilibrium as designed. The reason for this added care is your eager effort to not shock cool the engine. ![]() If you have them, close the cowl flaps first, and if you can, slow the plane down somewhat first. For a slower, lower power normally aspirated plane, it’s not that critical, but still go easy. ![]() When I used to fly the turbo Aztec, the drill was 2" of manifold pressure reduction per minute from cruise flight in winter. ![]() Presuming that closing the throttle is voluntary, and not at all rushed, as you applied your excellent pilot planning to not have to suddenly descend, close the throttle very gradually. I reminded myself, while winter flying yesterday, that considerations of closing the throttle in flight in air cooled engine powered planes are sometimes not clearly understood. ![]() Elsewhere, a discussion included power off flight. ![]()
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