Rotor Drag (Torque)

Question 1

When disc loading is increased, total rotor thrust must be (increased / decreased) and since this involves (increase / decrease) in angle of attack it follows that there will be a (deterioration / improvement) in the total rotor thrust / rotor drag ratio.

Answer 1

• Increase.
• Increase.
• Deterioration.

Question 2

When the total rotor thrust / rotor drag ratio gets worse, there is a requirement for _____________ power.

Answer 2

• More.

Question 3

When the gross weight of a helicopter decreases there is a requirement for (larger / smaller) pitch angles which produce (larger / smaller) inflow angles and power can be (increased / reduced).

Answer 3

• Smaller.
• Smaller.
• Reduced.

Question 4

When a helicopter descends into ground effect the induced flow (increases / decreases) which results in an ___________________ in angle of attack, if collective is not (raised / lowered). The helicopter will (maintain height / climb / descend).

Answer 4

• Decrease.
• Increase.
• Lowered.
• Climb.

Question 5

Compared to hovering out of ground effect, when hovering in ground effect the requirement for total rotor thrust is (more / the same / less), blade angles are (larger / the same / smaller) and power required is (more / the same / less).

Answer 5

• The same.
• Smaller.
• Less.

Question 6

When translational lift becomes effective on initial climb-out, (angles of attack / blade angles) increase and if the collective is neither raised or lowered the rate of climb will initially (increase / decrease).

Answer 6

• Angle of attack.
• Increase.