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Question 275-1 : In order to permit the rotor blades to rotate freely in autorotation ? [ Analysis topography ]

A free wheel unit is fitted between engine and rotor

exemple 375 A free-wheel unit is fitted between engine and rotor

Question 275-2 : The purpose of the swept back tip region in some modern rotor blade designs is to ?

Improve high speed performance.

. 1625 exemple 379 Improve high speed performance.

Question 275-3 : A conventional tail rotor has ?

Flapping hinges incorporating a delta 3 hinge, together with feathering hinges.

exemple 383 Flapping hinges incorporating a delta-3 hinge, together with feathering hinges.

Question 275-4 : Droop restrainers on a rotor head ?

Limit the amount of blade droop when the blades are rotating at low rotor rpm

exemple 387 Limit the amount of blade droop when the blades are rotating at low rotor rpm

Question 275-5 : An increase in the angle of attack of a rotor blade, on a helicopter in forward flight will cause the ?

Separation point to move forward.

. 1587 exemple 391 Separation point to move forward.

Question 275-6 : In a helicopter in forward, level flight, the angle of attack of the blades of a main rotor will be ?

Greatest on the retreating side.

. 1597.the angle of attack of the blades at the retrating side must be higher than the other side, due to the lower speed of the relative airlfow. exemple 395 Greatest on the retreating side.

Question 275-7 : To obtain minimum power required for still air hovering, induced velocities should ideally ?

Be uniform over the rotor disc.

exemple 399 Be uniform over the rotor disc.

Question 275-8 : The pressure at the stagnation point on a rotor blade is ?

Static plus dynamic pressure.

exemple 403 Static plus dynamic pressure.

Question 275-9 : In a hovering helicopter, recirculated air at the main rotor blade tips will cause ?

A reduction of lift

exemple 407 A reduction of lift

Question 275-10 : During an autorotation, an increase in collective pitch will 1 rotor thrust, 2 rotor rpm and 3 rate of descent ?

1 increase 2 decrease 3 decrease

exemple 411 (1) increase (2) decrease (3) decrease

Question 275-11 : During flight, an increase in main rotor torque will require ?

An increase in tail rotor pitch.

exemple 415 An increase in tail rotor pitch.

Question 275-12 : Fenestron blades are equipped with ?

Feathering hinges only.

.fenestron examples. 1624 exemple 419 Feathering hinges only.

Question 275-13 : If the coning angle of the main rotor disc is increased ?

The centre of gravity of the blade moves inboard

exemple 423 The centre of gravity of the blade moves inboard

Question 275-14 : Phase lag of a main rotor blade is the result of ?

Inertia and aerodynamic forces.

exemple 427 Inertia and aerodynamic forces.

Question 275-15 : Cyclic stick movement ?

Alters the disc attitude.

exemple 431 Alters the disc attitude.

Question 275-16 : The angle of attack of a blade section is the angle between the chord line and the ?

Relative airflow

exemple 435 Relative airflow

Question 275-17 : The pitch angle of a rotor blade section is ?

The angle between the chord line and the hub plane

exemple 439 The angle between the chord line and the hub plane

Question 275-18 : The coning angle is the angle ?

Between the longitudinal axis of the blade and the tip path plane

exemple 443 Between the longitudinal axis of the blade and the tip path plane

Question 275-19 : The main rotor shaft axis is ?

The axis through the main rotor shaft

exemple 447 The axis through the main rotor shaft

Question 275-20 : The axis of rotation of the blades is ?

The axis through the centre of the main rotor head about which the blades rotate

exemple 451 The axis through the centre of the main rotor head about which the blades rotate

Question 275-21 : The plane of rotation is perpendicular to ?

The axis of rotation and parallel to the tip path plane

exemple 455 The axis of rotation and parallel to the tip path plane

Question 275-22 : The tip path plane is ?

The path plane described by the blade tips during rotation and perpendicular to the axis of rotation

exemple 459 The path plane described by the blade tips during rotation and perpendicular to the axis of rotation

Question 275-23 : The type of aerofoil most commonly used for helicopter rotor blades has ?

Symmetrical aerofoil sections.

exemple 463 Symmetrical aerofoil sections.

Question 275-24 : The chord line of a blade section is ?

A straight line from leading to trailing edge

exemple 467 A straight line from leading to trailing edge

Question 275-25 : The coning angle of a rotor blade is determined by the blade weight and ?

The lift and the centrifugal force.

exemple 471 The lift and the centrifugal force.

Question 275-26 : A helicopter rotor system fitted with blade flapping hinges and blade drag hinges is said to be ?

Fully articulated


Question 275-27 : The three basic flight controls in a helicopter are ?

Collective pitch control, cyclic pitch control and yaw control

exemple 479 Collective pitch control, cyclic pitch control and yaw control

Question 275-28 : The rotor thrust is ?

An aerodynamic force acting perpendicular to the tip path plane.

exemple 483 An aerodynamic force acting perpendicular to the tip path plane.

Question 275-29 : Rotor blade drag is an aerodynamic force ?

Parallel to the tip path plane.

exemple 487 Parallel to the tip path plane.

Question 275-30 : The purpose of the collective pitch control is ?

To change the pitch angle on all rotor blades collectively.

. 1606 exemple 491 To change the pitch angle on all rotor blades collectively.

Question 275-31 : Lateral control of the helicopter is obtained by ?

The cyclic pitch control

exemple 495 The cyclic pitch control

Question 275-32 : The function of a helicopter tail rotor is ?

To counteract the torque reaction between the revolving main rotor and the fuselage

exemple 499 To counteract the torque reaction between the revolving main rotor and the fuselage

Question 275-33 : Yawing in a helicopter is the term used to define a rotation ?

About the normal axis

exemple 503 About the normal axis

Question 275-34 : Viewed from above, a helicopter in the hover, with anti clockwise rotating blades, if not corrected, would tend to drift to the ?

Right with power on

exemple 507 Right with power on

Question 275-35 : Flapping hinges are fitted to the helicopter rotor system to allow ?

For movement of the blade in the plane perpendicular to the hub plane


Question 275-36 : Drag hinges are fitted to ?

Allow for blade movement in the rotor disc plane.

exemple 515 Allow for blade movement in the rotor disc plane.

Question 275-37 : Phase lag is ?

A vertical movement of the blades to a maximum or minimum position at the point approximating 90 degrees further on in the plane of rotation from that at which force was applied.

exemple 519 A vertical movement of the blades to a maximum or minimum position at the point approximating 90 degrees further on in the plane of rotation from that at which force was applied.

Question 275-38 : Advance angle is an angle between the ?

Pitch link attachement on the swash plate and the longitudinal axis of the blade

exemple 523 Pitch link attachement on the swash plate and the longitudinal axis of the blade

Question 275-39 : Main rotor freedom of movement is defined as ?

Feathering, flapping and dragging.

exemple 527 Feathering, flapping and dragging.

Question 275-40 : During flight the cyclic stick determines ?

Attitude,airspeed and horizontal movement.

exemple 531 Attitude,airspeed and horizontal movement.


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