2104 - MIDTERMS

Question 1

performs the same function as
an airplane’s wings, providing lift as the blades rotate.

Answer 1

Main Rotor Blade

Question 2

Also known as the rotor shaft, the mast connects the transmission to
the rotor assembly

Answer 2

Rotor Mast

Question 3

transmits power from the engine to the main and tail rotors.

Answer 3

Transmission

Question 4

generates power for the helicopter.

Answer 4

Engine

Question 5

The main body of the helicopter is known as

Answer 5

Fuselage

Question 6

some helicopters have wheels, but most have skids, which are hollow tubes with no wheels or brakes

Answer 6

Landing Skids

Question 7

extends out from the rear of the fuselage and holds the
tail rotor assemblies.

Answer 7

Tail Boom

Question 8

Basic Parts of Helicopters

Answer 8

Rotor Blade
Rotor mast
Jesus nut
Blade Grip
Control rod
Upper swash plate
Ball Bearings
Lower Swash plate

Question 9

from the upper swash plate have a connection point on
the blades, making it possible to transfer movements of the upper swash plate to the blades.

Answer 9

Control Rod

Question 10

lie between the upper and lower swash plates, allowing
the upper plate to spin freely on top of the lower plate.

Answer 10

Ball Bearings

Question 11

fixed and doesn’t rotate.

Answer 11

Lower swash plate

Question 12

is a slang term for the main rotor retaining nut or mast nut, which holds the main rotor to the mast.

Answer 12

Jesus nut

Question 13

connect the blades to a hub.

Answer 13

Blade Grips

Question 14

is mechanically simple, but structurally complex because operating loads must be absorbed in bending rather than
through hinges. In this system, the blade roots
are rigidly attached to the rotor hub.

Answer 14

Rigid rotor system

Question 15

is usually composed of two blades that are rigidly mounted to the main rotor hub. The main rotor hub is free to tilt with respect to the main rotor shaft on what is known as a teetering or flapping hinge. The semirigid rotor is also capable of feathering, which means that the pitch angle of the blade changes.

Answer 15

SEMIRIGID ROTOR SYSTEM

Question 16

allow each blade to lead/lag (move back and forth in plane), flap (move up and down about an inboard mounted hinge) independent of the other blades, and feather (rotate about the pitch axis to change lift)

Answer 16

FULLY ARTICULATED ROTOR SYSTEM

Question 17

provides power on the ground for self contained engine startups and for energizing the systems with the engine shut down.

Answer 17

Battery

Question 18

driven by the engine and is the normal power source in flight. It powers the helicopter system and charges the battery

Answer 18

Generator

Question 19

can be used instead of the battery on
the ground for engine starting and for running the electrical tests.

Answer 19

External Power Unit/ Ground Power Unit-

Question 20

is the difference in lift that exists between the advancing half of the rotor disk and the retreating half. It is caused by the fact that in directional flight the aircraft relative wind is added to the rotational relative wind on the advancing blade, and subtracted on the retreating blade. The blade passing the tail and advancing around the right side of the helicopter has an increasing airspeed which reaches maximum at the 3 o’clock position. As the blade continues, the airspeed reduces to essentially rotational airspeed over the nose of the helicopter. Leaving the nose, the blade airspeed progressively decreases and reaches minimum airspeed at the 9 o’clock position. The blade airspeed then increases progressively and again reaches rotational airspeed as it passes over the tail

Answer 20

DISSYMMETRY OF LIFT

Question 21

provides power on the ground for self contained engine startups and for energizing the systems with the engine shut down

Answer 21

Battery

Question 22

driven by the engine and is the normal power source in flight. It powers the helicopter system and charges the battery.

Answer 22

Generator

Question 23

can be used instead of the battery on
the ground for engine starting and for running the electrical tests.

Answer 23

Ground Power Unit/External Power Unit