ETL stands for what in rotorcraft terminology?

ETL stands for what in rotorcraft terminology?

• A. End Translation Lift
• B. Effective Translational Lift
• C. Engine Torque Limit
• D. Enhanced Tail Rotor Load

Answer: (B)

Effective Translational Lift is the boost in rotor performance that occurs when you transition from hover into forward flight. As you start moving forward, the rotor disk moves into cleaner air and away from its own downwash. This reduces the inflow velocity through the rotor and makes the blades more efficient at producing lift for the same amount of collective input. The practical effect is easier altitude control, often a reduction in the power needed to hold a given height, and a noticeably surer feel as you accelerate out of hover. These other terms don’t fit because they aren’t the recognized concept in rotorcraft aerodynamics. End Translation Lift isn’t a standard term, Engine Torque Limit refers to engine torque capability rather than lift, and Enhanced Tail Rotor Load isn’t a term used to describe rotor performance in forward flight.

Effective Translational Lift is the boost in rotor performance that occurs when you transition from hover into forward flight. As you start moving forward, the rotor disk moves into cleaner air and away from its own downwash. This reduces the inflow velocity through the rotor and makes the blades more efficient at producing lift for the same amount of collective input. The practical effect is easier altitude control, often a reduction in the power needed to hold a given height, and a noticeably surer feel as you accelerate out of hover.

These other terms don’t fit because they aren’t the recognized concept in rotorcraft aerodynamics. End Translation Lift isn’t a standard term, Engine Torque Limit refers to engine torque capability rather than lift, and Enhanced Tail Rotor Load isn’t a term used to describe rotor performance in forward flight.