![]() The method used to simulate critical engine failure must represent the most critical mode of powerplant failure expected in service with respect to controllability. V MC is the calibrated airspeed at which, when the critical engine is suddenly made inoperative, it is possible to maintain control of the airplane with that engine still inoperative, and thereafter maintain straight flight at the same speed with an angle of bank of not more than 5 degrees. With a counter-rotating twin airplane, no matter which engine fails, torque opposes the roll created by asymmetric thrust. The descending, right blade on the right engine has a longer arm from the CG than the descending (right) blade of the left engine, creating a yaw force to the left. With high angles-of-attack, the descending blade (right side) produces more thrust than the ascending blade (left). In this configuration, losing either engine would have the same effect on performance and handling, and therefore there is no critical engine. This makes the left engine critical.įour factors are responsible for making the left engine critical on a conventional twin:Īircraft manufacturers solved the critical engine problem by implementing counter-rotating propellers, where the right engine rotates counter-clockwise. On a conventional light twin, both propellers rotate clockwise (from the pilot's point of view).
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