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Old 1st July 2010 | 16:09
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Shawn Coyle
 
Joined: Dec 2001
Posts: 1,835
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From: Philadelphia PA
Terminology is always an issue - rotor blades require / demand torque - they don't produce it.
And it depends where the torque is being measured - in the RR250 series engines, it's usually measured at the output from the engine, so it is the combination of main and tail rotor torque required / demanded.
Some helicopters measure torque at the transmission - but again you need to know if that measurement is mast torque or torque on a gear somewhere. And if it measures tail rotor torque as well.
And whatever the limitation is will be the limitation that must be obeyed for gauges installed - without trying to be clever and say that this can't be 'real' torque because it comes from hovering with a crosswind demanding more tail rotor power.
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