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In article , frank may
writes Well, counter rotating props eliminate torque on twin engined airplanes & on at least some, improves the single engine performance & handling. However, your question really seems to be about contra-rotating props, which is the case of a single engine driving 2 props on a co-axial shaft, rotating opposite of each other. Same thing, it eliminates the torque & therefore makes the airplane more docile. Contra-rotating props are same shaft, same engine, like a late Seafire or Shack or Bear. Counter-rotating are separate engines, like the P-38 or F-82 or several twin engine Pipers. Then there's the case (unique AFAIK) of the Fairey Gannet. The Double Mamba engine is in fact two Mambas side by side, each driving one of the two props. One half could be shut down to allow economical loiter. As far as torque is concerned, although without a prop, don't forget the Pegasus in the Harrier. Contra-rotating shafts to balance it so that hovering is easier/possible. -- Peter Ying tong iddle-i po! |
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