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Old 15th November 2008 | 08:27
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ianp
 
Joined: Dec 2005
Posts: 74
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From: Wiltshire
Think I know what your after jeep,
Torque is a measurement of how much something is being twisted, the physics says it is proportional to amount of force and moment arm from axis of rotation. That is for some thing static. If it is spinning the the power required to produce that torque is proportional to the torque required and the rotational speed.
In a helicopter if you are using torque measured at the engine or its input to the gearbox at the point when the engine is at max everything then as you increase collective, overpitching the rotor blades, as the Nr decays the torque measured at the negine will increase despite no change in engine speed.
We used to practice single engines failures in the SeaKing by setting one engine in manual (fuel computer off line and Ng/TIT fixed) then backing off the computer controlled engine to practice single engine flyaway or landings.
It is quite obvious that as Nr decays torque is increasing despite the driving engine at constant speed. The set up actually allowed for this to avoid transient single engine overtorque.
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