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ATPL Aeroplane Performance > En-route > Flashcards

En-route Flashcards

1
Q

What is range dependent on

A 
Mass 
Cg position 
Thrust / drag 
How much fuel 
Speed
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2
Q

What is Specific air range (SAR)

A

TAS / fuel flow

Nautical air miles / kg fuel

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3
Q

What is specific ground range (SGR)

A

Ground speed / fuel flow

Nautical ground miles / kg fuel

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4
Q

What a jet what is the SAR equation

A

Specific air range = TAS / drag (or thrust) x specific fuel consumption

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5
Q

For a propeller what is the specific air range equation

A

TAS / power required x specific fuel consumption

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6
Q

What is the speed for best range for a jet

A

1.32 Vmd

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7
Q

Where is a piston most efficient

A

Low / medium alt

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8
Q

Where is a turboprop most efficient

A

Mid / high alt

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9
Q

Where is a jet most efficient

A

High alt

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10
Q

What is the speed for best range turboprop

A

Vmd

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11
Q

How does mass affect the drag curve and Specific range

A

Drag curve up and right

Tangent steeper therefor more drag

Less SR

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12
Q

What do you do when you burn fuel in cruise to try and maintain optimum level

A

Step climb

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13
Q

How does wind affect best range speed

A

Fly slower in tailwind to make most use of the wind

Fly faster in headwind to minimise time in headwind

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14
Q

What is the long range cruise speed for jet

A

4% faster than 1.32 Vmd

99% of max range achieved

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15
Q

What is the cost index used for

A

If fuel / operating costs are less then more fuel can be burned for the same price making the flight quicker

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16
Q

What is the cost index

A

0 - 200

0= lowest cost index = need to be most economic = fly at 1.32 Vmd

50= long range cruise (ish)

200 = highest cost index = can be fastest flight

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17
Q

What is the endurance equation

A

Endurance = 1 / drag (or thrust) x specific fuel consumption

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18
Q

What is the speed for max endurance at high alt for jet

A

Vmd

19
Q

What speed is max endurance for propeller

A

Vmp

Piston low alt
Turboprop = medium alt

20
Q

When is mass proportional to fuel flow

A

Vmd only!

21
Q

Does wind affect endurance

A

No

22
Q

What happens to change over alt with a higher cas

A

Higher cas lower change over alt

23
Q

What happens to change over alt with a lower Mach

A

Lower Mach = lower change over alt

24
Q

What happens to flight path angle
AOA
Pitch in a descent on Mach

A

Flight path angle increases
AOA decreases
Pitch decreases

25
Q

What is the speed for min descent angle

A

Vmd

26
Q

What is the speed for max descent angle

A

Vmo

27
Q

What is the speed for min rate of descent

A

Vmp

With engines running = just slightly faster than Vmp

28
Q

What speed is max rate of descent speed

A

Vmo

29
Q

What does mass do to glide angle

A

Nothing

30
Q

How does headwind affect glide path

A

Steeper glide path

31
Q

How does tailwind affect glide path

A

Glide path shallower

32
Q

How does flaps affect glide path

A

Steeper glide path

33
Q

What is the speed for best endurance for a prop

A

Vmp

34
Q

What is the speed for best endurance for a jet

A

Vmd

35
Q

What is the speed for best range prop

A

Vmd

36
Q

What does a tailwind do to the speed for best range in a prop

A

Decreases slightly

37
Q

What does a headwind do to the speed for best range in a prop

A

Slightly faster

38
Q

What is the speed for best range in a jet

A

1.32 Vmd

39
Q

What does a tailwind do to the speed for best range in a jet

A

Slightly slower

40
Q

What does a headwind do to the speed for best range in a jet

A

Slightly faster

41
Q

What speed would you fly on a cost index of 0

A

1.32 Vmd

42
Q

What speed would you fly for a long range cruise

A

4% faster than 1.32vmd

= 99% of Specific range

43
Q

What speed would you fly for a cost index of 200

A

Faster than 1.32 vmd

ATPL Aeroplane Performance (13 decks)

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