Rotor Flashcards
Above what RPM is the flapping angle no longer limited?
31% N2
The purpose of the yoke assembly in the main rotor system is to ________ and ______.
Support the main rotor assembly, serve as a pitch change axis
The TH-67 tail rotor incorporates a delta hinge type hub assembly providing compensation for
Dissymmetry of the lift in the tail rotor
A bolt, washers, and a nut maybe added to the ______ to help eliminate ________ and provide span wise and chord wise balance
Dynamic balance wheel, high frequency vibrations
When a cyclic input is applied, the input (blade feathering action) occurs _________ of the rotation.
When the blade is positioned 90 degrees earlier in the plane
The tail rotor pitch horn is mounted to the blade root and is the component that _______
Changes blade pitch angle
Each TH-67 main rotor blade is manufactured with a ____ degree twist to ______ along the blade span
-10, equalize lift
Through mechanical linkage, movement of the _____ causes the main rotor system to tilt
Cyclic
The ________ and pitch horn are connected by the pitch change links/tubes on the main rotor system
Rotating swashplate
The trunnion, which attaches the main rotor hub assembly to the mast, allows the main rotor system to _____ and _____
Rotate, tilt (flap)
How is the yoke attached to the main rotor trunnion?
Pillow blocks
Weights attached to the tail rotor pitch adjust for _____
Pedal creep
At what RPM is the main rotor flapping limited to 6” maximum?
25% N2. RPM or below
The components that enable the mast to drive the rotating swashplate are the ____, ____, ____.
Collar set, idler lever, idler link
The semi-grid, under slung main rotor hub provides for the _______
Mount for two metal blades
The tail rotor consists of?
Stainless steel skin with a honeycomb aluminum core
The 3 structural members of the main rotor blade are the ______, ______, ______
Aluminum spar, spar closure, trailing edge strip
Laminated reinforcements known as ______ are applied at the blade root to sustain the sheering force of the blade retention bolt.
Doublers
Weights are added to the main rotor blades at the factory to preserve _____
Preserve Favorable aerodynamics characteristics
The purpose of the flip restraint kit is to ______
Limit blade flapping during low rotor speeds during startup and shut down.
The main rotor blade is a/an _______ airfoil using a positive chamber leading edge known as a ______ design
Asymmetrical, droop snoot
How is the rotor system attached to the main rotor mast?
By a splined trunnion
The ________ transfer the centrifugal loads, encountered during rotation, from the blade grip to the yoke.
Tension-torque (TT) straps
