AMT 2104 (HELICOPTER OPERATION AND MAINTENANCE) PRELIMS Flashcards
A ______ is a heavier than air-flying machine that generates lift using rotary wings or rotor blades.
Rotorcraft
The helicopter that considered as America’s first production helicopter.
Sikorsky’s XR-4
A model flying machine that used coaxial propellers and a coiled spring for propulsion
Helicopters
A helicopter that used two 6.1 meters (20ft) counter rotation rotors driven by a 24 hp(18kW) Antoniette Engine
Cornu Helicopter
The machine that achieved its first vertical ascent on either August 24 or September 29
Gyroplane No. 1
The earliest references for vertical flight that came from China.
Chinese Top
Opposes the downward force of weight.
Lift
Retarding force caused by disruption of airflow by the wing, rotor, fuselage, and other protruding objects.
Drag
Combined load of the helicopter itself, the crew, the fuel, and rhe cargo or baggage.
Weight
Force produced by the powerplant/propeller or rotor
Thrust
Most common type of helicopter configuration
Singe rotor configuration
Two main rotors mounted on one mast, sharing the same axis of rotation but turning in opposite directions.
Co-Axial Rotor
The most challenging part of flying a helicopter
Hovering Flight
The tip path plane is tilted in the direction that flight is desired.
Sideward Flight
The tip-path plane is tilted rearward, which, in turn, tilts the lift-thrust vector rearward
Rearward Flight
An upward sweeping angle of the rotor blades as a result of lift and centrifugal force.
Coning
Also referred to as the law of conservation of angular momentum
Coriolis Effect
The rotors are mounted at the edge of the wings, on nacelles that rotate in order to transition the rotors from the vertical position to the horizontal position.
Tilt Rotor
On what date sikorsky took the VS-300 on its first flight?
Sept . 14, 1939
A separate rotor that overcomes torque.
Tail Rotor
The rotorcraft had a 45-horsepower engine , just powerful enough to hover for 2 minutes.
Gyroplane No.1
The cyclic pitch control varies the lift of the main rotor by increasing or decreasing the pitch of all blades at the same time. TRUE OR FALSE?
False (Collective)
Rotating the grip inboard increases rpm, and rotating it outboard decreases rpm. TRUE OR FALSE?
False (outboard, inboard)
During the 1992 Persian Gulf War, the AH-64 “Apache” helicopter performed well as both a tank killer and fast- assault vehicle. TRUE OR FALSE?
FALSE (1991)
A coaxial rotor helicopter has two main rotor systems and no tail rotor, usually the rear rotor is mounted at a higher position than the front rotor. TRUE OR FALSE?
FALSE (DUAL/TANDEM)
Autogiro No. 4 is considered to be the first controlled helicopter flight. TRUE OR FALSE?
TRUE
The throttle control is mounted on the cyclic pitch grip and is operated by rotating the motorcycle–type grip. TRUE OR FALSE?
FALSE (COLLECTIVE)
All primary controls are actuated through push-pull tubes and bellcranks. TRUE OR FALSE?
TRUE
UH-60 is the most popular helicopter in the U.S. military. TRUE OR FALSE?
TRUE
The Anti-Torque Pedals, also known as “torque control” provides for movement about the vertical axis. TRUE OR FALSE?
TRUE
The Cyclic Pitch Control is located on the left side of the pilot’s seat and is operated with the left hand. TRUE OR FALSE?
FALSE (COLLECTIVE)
a sensing device that senses rotor and engine r.p.m. and makes the
necessary adjustments in order to keep rotor r.p.m. constant.
Governor
also known as “torque control” provides for
movement about the vertical axis
(yaw).
Anti - Torque Pedal
7 Types of Helicopter Configuration
Single Rotor System
Tandem Rotor
Co- Axial Rotor System
Synchropter
Side by Side Configuration
Tilt Rotor Configuration
No Tail Rotor Configuration
Four forces acting on helicopter
Thrust
Drag
Lift
Weight
