Lecture 12

Question 1

Collective stick tandem rotor heli

Answer 1

all the blades on both rotors increase pitch at the same time

Question 2

Forward
Backward

Answer 2

Pilot pushes forward on cyclic stick, both rotor sticks tilt forward
Pilot pulls backward on the cyclic stick, both rotor sicks tilt backward

Question 3

To move left
To move right

Answer 3

Cyclic turns both rotors left or right

Question 4

To yaw left or right

Answer 4

Pressing anti-torque foot petals yaws rotors in opposite directions (controls where you face)

Question 5

Increasing and decreasing
the pitch of the rotor blade
is known as

Answer 5

feathering

Question 6

To equalize the lift along the span of the blade, the blade is made with a twist that lowers between the blade root and the blade tip

Answer 6

the angle of incidence

Question 7

how to fix
DISSYMMETRY OF LIFT
GYROSCOPIC PRECESSION

Answer 7

INSTALL FLAPPING HINGES
By FLAPPING the lift
can be equalized on
each side

Question 8

how to fix CORIOLIS EFFECT; or
the “ice skater effect

Answer 8

LEAD-LAG HINGES

Question 9

how to fix Lead-lag movement caused massive vibration

Answer 9

INSTALL
LEAD-LAG DAMPENERS

Question 10

Fully articulated rotor heads have both

Answer 10

flapping and lead-lag
hinges

Question 11

Two bladed rotor systems can employ what is known as a
SEMI-RIGID rotor system.

Answer 11

The semi rigid has a lead-lag hinge, but no flapping hinge

Question 12

rigid rotor

Answer 12

no hinges in the rotor blade

Question 13

f gyroscopic precession means that any force put into a
spinning object takes effect 90 degrees later,
HOW DOES THE CYCLIC PITCH CONTROL MOVE THE HELICOPTER
FORWARD, BACKWARD, LEFT, AND RIGHT

Answer 13

The pitch input to the main rotor is automatically put in 90
degrees before you need it