Whats!

Question 1

Autorotation

Answer 1

A manoeuvre that uses airflow from beneath the disc to turn the disc without an engine

Question 2

Delta-3

Answer 2

Reduces AOA when the blade flaps up to reduce how much the blade flaps

Question 3

Stability

Answer 3

The ability of anything to return to it’s original position after it as been disturbed

Question 4

Tail Rotor Roll

Answer 4

The tendency of the skid opposite to the tail rotor thrust to hang low

Question 5

Rigid rotor head

Answer 5

A rotor system that allows the individual blades to feather only

Question 6

Ground resonance

Answer 6

A damaging oscillation an inbalance between the rotor head and the skids that are in contact with the ground

Question 7

Dynamic rollover

Answer 7

When the helicopter is forced to toll over due to motion around a skid when acting as a pivot point

Question 8

Inflow Roll

Answer 8

The disc rolling to the advancing side in accelerating or decelerating flight at low speed

Question 9

Translation lift

Answer 9

An aerodynamic effect where induced flow being blown away in accelerating flight that gives more lift for the same pitch

Question 10

Recirculation

Answer 10

The effect when downwash re-enters the disc

Question 11

Retreating blade stall

Answer 11

A stall caused by an excessively large AOA due to excessive flapping down when to retreating blade speed is low due to excessive air speed

Question 12

Reverse flow

Answer 12

Due to aircraft airspeed overtaking the blade speed

Question 13

Washout

Answer 13

Creates equal lift distribution across the blade by decreasing pitch at the tip