Question 251-1 : In autorotation the blades are free to rotate because ? [ Explanation maintenance ]

Question 251-2 : The effect of ground cushion on a hovering helicopter is greatest on ?

Question 251-3 : A free wheel is fitted to a helicopter to ?

Question 251-4 : When right pedal is applied to a hovering helicopter whose main rotor is rotating clockwise when viewed from above. 1 the power required will.......... 2 the helicopter will yaw to the......... ?

Question 251-5 : For a given quantity of air, if pressure and temperature remain the same and humidity is increased the air will become ?

Question 251-6 : As airspeed increases during the transition from the hover to the climb, the rate of climb improves due to a ?

Question 251-7 : Maximum permissable rotor rpm in powered flight are governed by ?

Question 251-8 : Flying for range in autorotation requires ?

Question 251-9 : Retreating blade stall is most likely to occur at ?

Question 251-10 : On a see saw rotor, the axis of rotation of the shaft of the main rotor is ?

Question 251-11 : The rotor disc is ?

Question 251-12 : The load of a blade is equal to ?

Question 251-13 : The pitch angle of the blade sections ?

Question 251-14 : The mean induced airflow velocity is considered perpendicular to the ?

Question 251-15 : In the hover, the induced airflow velocity ?

Question 251-16 : For a rotor which turns in a clockwise direction seen from above, in a sideways hover to the right, with zero wind, the pilot will see the retreating blade ?

Question 251-17 : The position of the advancing blade relative to the pilot in forward flight ?

Question 251-18 : For a rotor which turns in an anti clockwise direction seen from above, in a sideways hover to the left, with zero wind, the pilot will have the retreating blade ?

Question 251-19 : For a rotor which turns in a clockwise direction seen from above, in a sideways hover to the left, with zero wind, the pilot will have the retreating blade ?

Question 251-20 : The position of the retreating blade relative to the pilot in forward flight ?

Question 251-21 : In a stationary hovering relative to the ground , the position of the retreating blade relative to the pilot ?

Question 251-22 : Blade sailing is a condition which may occur ?

Question 251-23 : If the helicopter is affected by a strong gust of headwind whilst the rotor rpm is low ?

Question 251-24 : To minimise the dangers of blade sailing ?

Question 251-25 : The helicopter is said to be statically stable if, after a disturbance in flight ?

Question 251-26 : Dynamic stability in a helicopter can only exist if there is ?

Question 251-27 : A helicopter in the hover is statically ?

Question 251-28 : A stabiliser fitted to the tail boom of a helicopter, in forward flight, will 1 stability in 2 ?

Question 251-29 : A stabiliser fitted to the tail boom of a helicopter, in rearward flight, will 1 stability in 2 ?

Question 251-30 : On a two bladed main rotor, a stabiliser bar positioned at 90 degrees to the rotor blades will 1 stability and 2 control forces ?

Question 251-31 : Control power is the effectiveness of ?

Question 251-32 : The addition of a mass in the blade tip at 60% of the chord will ?

Question 251-33 : Centrifugal force ?

Question 251-34 : In level steady forward flight, an increase of the speed of the main rotor without any change in lift will ?

Question 251-35 : Flapping is the ?

Question 251-36 : During steady level forward flight, forces acting on a helicopter are ?

Question 251-37 : Moving the centre of gravity to the extreme aft position will ?

Question 251-38 : A helicopter is statically stable when it shows the ?

Question 251-39 : The 'vortex ring state' which may develop under conditions of a power on descent at low forward airspeed is ?

Question 251-40 : The principle of virtual offset hinges are used in a hingeless rotor system which has the effect of 1 stability and 2 control power ?