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1. CPLH Aerodynamics > CADH Practice Cards 4 > Flashcards

CADH Practice Cards 4 Flashcards

Random questions /statements for exam preparation

1
Q

A design feature employed to eliminate phase lag is called…

A

the advance angle

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2
Q

What causes the total power required curve to increase after minimum power speed?

A

A combination of parasite drag and profile drag

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3
Q

What are trim tabs used for in helicopter rotor systems?

A

Tracking of the main rotor

Ref: Principles of Helicopter Fligt, Chapter 20

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4
Q

Departing an aerodrome at high density altitude and igh AUW without careful power management can cause….

A

Over-pitching

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5
Q

What vector replaces induced flow during autorotation?

A

Descent flow

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6
Q

The term ‘Blade Sailing’ can be described as….

A

Blade sailing is a phenomenon which occurs on shut down or start up wen the rotor RRP is too low for centrifugal force to prevent the blades from flapping excessively in windy conditions

Ref: Principles of Helicopter Flight, Chapter 19

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7
Q

On take off you realize that your right skid is dragging on the ground. What should you do to prevent dynamic rollover?

A

Apply left cyclic and increase collective

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8
Q

a 30kt tailwind will cause the TAS for best range to ….

A

Decrease

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9
Q

When flying a helicopter with a fully articulated rotor system and fitted with oleo strut shock absorbers, you notice a ‘wobble’. On touch down this wobble turned into extreme vibrations. You are experiencing…

A

Ground Resonance. If RRPM permits, increase collective and return to the hover.

Ref: Principles of Helicopter Flight, Chapter 19

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10
Q

Trim Tabs are used for?…

A

Tracking of the main rotor

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11
Q

In respect to a conventional helicopter, if you have a large positive pitch what will occour?

A

Yawing to the left

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12
Q

If you have an increase in headwind, this will cause the speed for best range to…..

A

Increase

Ref: Prinicples of Helicopter Flight, Chapter 13

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13
Q

Offsetting the mast to the left in a conventional rotor system will compensate for….

A

tail rotor roll.

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14
Q

The bottom of the power curve depicts the maximum excess power for a given airspeed, you can also find the….

A

Minimum power, best endurance and best rate of climb (ROC)

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15
Q

In a stick free condition, the helicopter is….

A

statically and dynamically unstable

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16
Q

The TAS for best angle of climb (AOC) is calculated on the power curve by….

A

drawing a tangesnt from the power available until it intersects the curve.

Ref: Principles of Helicopter Flight, Chapter 13

17
Q

In a conventional helicopters, the condition that is more likely to produce dynamic roll over is…

A

Hoving right skid low, drifting right.

18
Q

Induced flow is…

A

undesirable.

19
Q

The condition that will most likely lead to vortex ring state is….

A

High rate of descent, high power and low forward airspeed.

20
Q

The correct description of the operation of the cyclic is…

A

The cyclic changes the pitch indipendantly on each blade relative to the mast.

21
Q

With respect to the lift formula, if air density is increased, llift will…

A

increase

Part 61 MOS Schedule 3 Unit 1.3.1 CADC 2.4.1 General Helicopter Aerodynimics - Lift

22
Q

When discussing helicopter rotor blade design features, twist refers to …

A

reducing the pitch angle and therefore the angle of attack from the hub towards the tip

Part 61 MOS Schedule 3 Unit 1.3.3 CADH 2.1.1 Twist

23
Q

In a still air hover the forces acting on a helicopter are balanced as follows …

A

total rotor thrust equals weight, torque equals rotor drag

PArt 61 MOS Schedule 3 Unit 1.3.3 CADH 2.2.1 Forces Acting in Hovering Flight

24
Q

The conditions required to settle with power are …

A

a descent rate, nearly zero airspeed, power applied

Part 61 MOS Schedule 3 Unit 1.3.3 CADH 2.2.3 Conditions Leading to Settling wth Power

25
Q

Refer to the Vector Diagram for Forward Flight below.
Insert Picture
The letter corresponding to the pitch angle is …

A

B

Part 61 MOS Schedule 3 Unit 1.3.3 CADH 2.4.2 Label a Vector Diagram of a rotor Blade in Forward Flight

26
Q

Flapping is …

A

angular movement about an axis parallel to the chord line

Part 61 MOS Schedule 3 Unit 1.3.1 CADC 2.3.1 Flapping

27
Q

In the semi-ridgid rotor system, hunting stresses are minimised by …

A

underslinging the hub

Part 61 MOS Schedule 3 Unit 1.3.3 CADH 2.3.1 Dragging

28
Q

When the helicopter is being flown at a density altitude where it has sufficent power to hover out of ground effect, the best range airspeed is …

A

always greater than the best rate of climb airspeed

Part 61 MOS Schedule 3 Unt 1.3.1 CADC 2.3.1 Power required

29
Q

During translational lift, the approximate air speed which gives the average helicopter the minimum total power required is …

A

appx. 50 kt

Part 61 MOS Schedule 3 Unit 1.3.1 CADC 2.3.1 Speed for Minimum Power Required

1. CPLH Aerodynamics (5 decks)

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