Do contra rotating propeller incidence angles of first and second prop with different spin diameters affect positive or negative thrust an speed of the a/c?


closed as unclear what you're asking by TomMcW, vasin1987, J. Hougaard, Gerry, Manu H Jan 14 at 9:37

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.


I would say that the propellers are there to create positive thrust, so if they created negative thrust, they would not be used. It seems logical to me.

Also, I believe you're asking about contra-rotating propellers. It's a minor difference in definition.

If a twin engine airplane (for example) has one engine that turns to the right, and the other engine turns to the left, they are counter-rotating.

If a single engine drives two propellers, and they turn opposite directions, they are contra-rotating.


Not the answer you're looking for? Browse other questions tagged or ask your own question.