theory of flight

Question 1

when a force is applied on a spinning object, the result will be felt at a maximum 90 degrees after force input. this is known as what?

Answer 1

gyroscopic precession

Question 2

What does the collective control do in a helicopter?

Answer 2

controls movement around the vertical axis

Question 3

The difference in lift between advancing and retreating side of rotor disk caused by different blade speed when moving in flight is known as what?

Answer 3

dissymmetry of lift

Question 4

When does blade tip stall occur and how is it prevented?

Answer 4

When the airspeed is high, prevented by flying slower than normal

Question 5

 Changing the radius of the rotor blades to keep angular momentum the same is described as what?

Answer 5

coriolis effect

Question 6

When air vortices occur on the inside of the blade what is this known as?

Answer 6

vortex ring state

Question 7

The angle that blades bend upwards in flight is known as what?

Answer 7

coning angle

Question 8

when rotor RPM is too low and the pilot cannot regain thrust this is known as what?

Answer 8

over pitching

Question 9

when a helicopter lands on one ski and shakes causing vibrations this is known as what?

Answer 9

ground resonance

Question 10

when do blades reach maximum deflection after an input has been made?

Answer 10

90 degrees after input

Question 11

What is the name given to the point of the blade that attaches to the rotor hub assembly?

Answer 11

root of blade

Question 12

How is droop of static blades stopped on start up?

Answer 12

droop stop

Question 13

which part of the blade is moving the fastest when in operation?

Answer 13

blade tips

Question 14

how is blade tip path (dynamic balancing) checked for on helicopters?

Answer 14

colour coding