Part 2 Flashcards
What do you call the vertical etches that intermesh with transmission gears on the mast?
Splines
Where is the mast usually located, relative to the aircraft’s weight and balance?
Within the C of G
_________ is the twisting force caused by counter-torque that acts on the mast
Torsion
______________ is the force caused by the weight of the Rotor Hub assembly
Compression
The mast is a critical item, and in some instances has a ________ _______
Finite Life
What is this device called?
Stabilizer bar
________ ______ is the angle between the chord line of the blade and a reference plane
Pitch Angle
_______ is the distance from the leading edge to the trailing edge
Lift is ___________ to relative wind
Perpendicular
Drag is _________ to relative wind and __________ to lift
Parallel,Perpendicular
The preset angle for airplane wings is called the…?
Angle of incidence
What is the universal letter for RPM?
‘N’
What is Nr?
Main rotor RPM
____
_______ ________ is a condition that can cause damage to the tail on longer bladed helicopters
Blade Droop
Centrifugal force depends on which two factors?
Weight of the blade and its velocity
Coning is caused by the _______ of the helicopter
Weight
If the blades are out of track, what do you adjust?
Pitch links
The rotor speed ________ from the blade outwards
Increases
In a no-wind hover, lyft is ____________ over the entire rotor disc
Symmetrical
In forward flight, the advancing half of the disc produces ______ lift than the retreating half, causing _______________ ___ _______
More, Dissymmetry of lift
Helicopter forward speed is limited because of…
Dissymmetry of lift
To compensate for dissymmetry of lift, what can helicopter blades do?
Flap, lead and lag
Why can’t heliciopters fly fast?
Because of dissymmetry of lift
Why does the advancing side get more lift?
Greater relative wind
How do you counteract dissymmetry of lift?
Flapping hinge
According to Mr.Baugh, “When the blade flaps up….?
…it Spills some lift”
Blade Lead/lag is accomplished through a ________ ______
Vertical Hinge
In a fully ariculated main rotor head, there are ______ axis of rotation
Three
The Speed change in an object getting smaller is called __________ ________
Coreolis effect
Another name for the Coreolis effect is the ________________ ____ ___________ _______________
Conservation of angular momentum
Coreolis Effect is the result of ________ __________
Blade Flapping
On a semi-rigid helicopter, the blades are kept below the C of G to prevent the coreolis effect, this design is called the __________ ________
Underslung Design
_______ ___________ prevents droop when blades are at rest
Droop Restraints
What does the grip do?
Holds on to the blade through the blade bolt
What is the purpose of the yoke?
Carries the load of the blades
Lead/Lag has to be __________
Dampened
Which orientation is the flapping hinge?
Horizontal
______ ___________ is dampening vibrations from blade lead/lag, flapping by using a mass
Mass Dampening
Under normal conditions, with the stick trim off, is there artificial feel?
No, there isn’t any artificial feel
Which component can also give you trim?
Magnetic brake
