What torque corresponds to the NR power-off takeoff/max?

What torque corresponds to the NR power-off takeoff/max?

• A. 110% max
• B. 103% max
• C. 90%
• D. 115% (6 sec)

Answer: (B)

Torque represents how much power the engine is delivering relative to its maximum. When the rotor is at NR and you’re aiming for a power-off takeoff or maximum performance, you use a torque level that is just above 100% to ensure enough power for liftoff while staying within safe engine limits. The prescribed limit for this NR power-off takeoff/max condition is 103% of max torque. That small margin accounts for transient fluctuations and system losses, giving reliable takeoff power without pushing the engine beyond its allowable stress. Higher limits like 110% or 115% (the latter often being a short-duration 6-second limit) are reserved for different, temporary situations and would exceed the normal takeoff/max envelope. A value like 90% would not provide sufficient power for a proper takeoff.

Torque represents how much power the engine is delivering relative to its maximum. When the rotor is at NR and you’re aiming for a power-off takeoff or maximum performance, you use a torque level that is just above 100% to ensure enough power for liftoff while staying within safe engine limits. The prescribed limit for this NR power-off takeoff/max condition is 103% of max torque. That small margin accounts for transient fluctuations and system losses, giving reliable takeoff power without pushing the engine beyond its allowable stress.

Higher limits like 110% or 115% (the latter often being a short-duration 6-second limit) are reserved for different, temporary situations and would exceed the normal takeoff/max envelope. A value like 90% would not provide sufficient power for a proper takeoff.