If an airplane with two propellers has both propellers with the same rotation direction (say, both the propellers rotate counter-clockwise as seen from nose to the tail), will be the four left-turning tendencies still be generated?

Airplane with two propellers


No, because they turn on different axis which does not coincide with the longitudinal axis of the airplane. Having two propellers turning the same way on the same axis, it would enforce the effect.

  • 2
    $\begingroup$ How does the separation of the axes make the torque disappear? This seems to contradict classical mechanics. $\endgroup$ – AEhere Jan 24 at 14:52
  • $\begingroup$ As the engines rotate clockwise seen from a pilot view (or anti-clockwise from the nose to the tail view), when the engine 2 rotate, will it not hil the vertical stabilizer which will make turn-left tendency? $\endgroup$ – AirCraft Lover Jan 25 at 1:50
  • $\begingroup$ As long as my deduction comes from observation and not from a mechanical engineer degree, both engines outflow will hit the vertical stabilizers one on each side of the longitudinal axis, having not the torque applied to one of the axis won't let the airplane turn, in my humble opinion, one or both the engines running, since the torque they would apply is not on the longitudinal axis of the plane. $\endgroup$ – Max Lombardi Jan 28 at 9:01
  • $\begingroup$ Seems that I have missed this discussion. I apologize. $\endgroup$ – AirCraft Lover Mar 1 at 2:49
  • $\begingroup$ As I said, if both the propeller are rotating counter-clockwise (seen from nose to the tail), then in my opinion, propeller 2 will generate wind spiral, which it will still hit the vertical stabilizer, then make the airplane forced to turn left. $\endgroup$ – AirCraft Lover Mar 1 at 2:53

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