AA Quiz - Helicopter Flight

The power needed to overcome the aerodynamic drag of the blades is known as the:

• induced power

• profile power

A good figure of merit is around:

• 0.15

• 0.75

• 0.5

• 0.25

In vertical autorotation, the air flows ___ through the rotor disk.

• downwards

• upwards

In vertical autorotation, the following regions of the disk tend to slow the rotation of the blade:

• The driving region only.

• The stall region only.

• The stall region and the driven region.

• The driven region and the driving region.

For a helicopter in forward flight, the lift produced is greater at the retreating side of the blade.

• True

• False

To compensate for dissymmetry in lift, we can:

• Increase the rpm of the rotor disk.

• Use collective feathering.

• Use cyclic feathering and allow flapping.

• Use cyclic feathering only.

As a rotor blade flaps downwards, this:

• increases the induced flow

• decreases the induced flow

As a rotor blade flaps upwards, this:

• increases the induced flow and increases the effective AoA

• increases the induced flow and decreases the effective AoA

• decreases the induced flow and decreases the effective AoA

• decreases the induced flow and increases the effective AoA

As a rotor blade flaps downwards, this:

• increases the effective AoA

• decreases the effective AoA

Helicopters usually travel at faster forward speeds than fixed wing aircraft.

• True

• False