Joined: Feb 20, 2008 Posts: 1059 Location: New York
Posted: Sat Sep 26, 2009 12:41 am Post subject: Ground School
Ooooo. Tricky question. In order to answer correctly, one must understand what is meant by torque rotation. Torque is "to twist", "to turn", "to spin".
The rotor blades torque is in the same direction as the main rotor blades turn! The Anti-torque pedals are so named because they provide thrust against the effects of engine torque.
A) I would think this one.
B) Nope. We INCREASE pitch anytime power is increased
C) Don't think so. Decreasing pitch, reduces TR thrust, causing the copter to yaw in a direction opposite to that of the turning rotors (torque rotational direction)
D) However, this is also true! Since the tail rotor is coupled to the TR transmission then via shaft to the main engine transmission, any increase or decrease in pitch (load) of the tail rotors is transmitted to the engine, and rpms change accordingly. Left pedal settle, right pedal rise! (counterclockwise rotor system)
CONFUSION FACTORS: If one interprets torque rotation as the direction caused by the "effects" of the engine, then (C) would become the correct answer.
Since (A) and (C) are direct opposites, one MUST be the correct answer.
Answer (D) is a confusion factor no matter how you look at it.
That is why the correct answer lies only in the mind of the person who prepared the question!
Hate tests. _________________ "A Copter Pilot's Life has it's... ups and downs"
Bell 47-206, Schweizer 300/500, Citation 525
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