PPRuNe Forums - View Single Post - Is there engine "torque" on take off in a turbo-prop single engine aircraft?
Old 18th April 2006 | 12:36
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barit1
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From: flyover country USA
Originally Posted by LOMCEVAK
... due to torque a Spitfire needs about 1/3 to 1/2 aileron at the start of the take-off roll to maintain wings level.
Really? How effective are the ailerons at zero IAS???

...
However, with a turboprop there is no mechanical connection between the turbine/propeller and the engine/airframe and so, neglecting friction, there can be no true torque effect in a turboprop.
Newton's laws still apply to a turboprop. The torque generated by the power turbine is relatively low, but it is multiplied in the prop gearbox (typically 13 or 15 to 1). In concept, it is no different from a geared piston engine (e.g. Merlin): The torque delivered to the propeller must be reacted by the engine mounts, transferring directly to the airframe.

PS - it would be no different if the driver were an electric or hydraulic motor - had you ever held a small electric motor in your hand when it starts?

Last edited by barit1; 18th April 2006 at 12:58.
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