![]() ![]() Twin-engined aircraft and watercraft often have counterrotating engines and propellers. Making (piston) engines rotate the other direction is not a huge problem. Indeed today the majority of automobile engines rotate the opposite direction. I had wondered if the majority of engines available to early manufacturers was in that direction and made it preferable, but I couldn't find anything suggesting that. It appears to be simply an accident of choice. Is there any reason to prefer CW rotation over CCW as a convention in a single engine plane?. ![]() It is easy to see that once this is understood, a single configuration will be preferred within a community to minimize differences between aircraft. An experienced pilot will want to understand and compensate for these effects when necessary. Helical prop wash, p-factor, gyroscopic precession, differing blade angles of attack all are due to the asymmetry of spinning in a single direction. When flying, the spin direction of the prop has several effects. ![]() Is there any reason for single-engine propellers to turn the same way?.I'll break this down into two separate questions. I wasn't able to find any good historical references, so this answer is pure opinion. ![]()
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