Airplanes obviously employ very different engine technology compared to ground vehicles, but some actually do use a form of ...

where a very slow propeller speed is needed. This engine has a normal full-power speed of 78 rpm and of 54 rpm at the economy rating E4. This will be the first production engine to incorporate VEC ...

Then I look at the tip-speed, and extend the diameter of the propeller as far as I can, so that at maximum rpm, the propeller is not going above 850 feet per second on the tip-speed. At about 800 ...

Car engines run at higher revolutions per minute than aircraft engines; adding the unit slows rpm so the propeller operates ... (and an hour reserve) at a speed of 130 mph, and room to carry ...