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Performance > Thrust And Power > Flashcards

Thrust And Power Flashcards

1
Q

Thrust is greatest when

A

Brakes released (output constant/input Varys (low when not moving)

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2
Q

Ram Effect

A

Increases thrust due to mass flow increase when compressibility of air begins

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3
Q

Momentum Drag

A

The thrust lost from increase in speed - air entering increasing but exit speed constant

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4
Q

Flat Rating

A

ISA +15 degrees
RPM limited with temperature

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5
Q

TOGA is limited to

A

10 minutes with engine failure
5 minutes for all engine operations

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6
Q

Power Available

A

Thrust x Velocity (TAS)

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7
Q

Power Required

A

Drag x velocity (TAS)
Varies with induced drag/parasite drag

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8
Q

Power Vs Thrust graph shows

A

Thrust is almost constant against TAS
Power is 0 at brakes release and increase with TAS

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9
Q

VMP =

A

VMP = 0.76 x VMD

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10
Q

Fuel flow formula

A

Kilograms
—————
Time (Hour)

Propeller - Power x SFC
Jet Engine - Thrust x SFC

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11
Q

SFC

A

Specific fuel consumption
Proportional to temp/alt/pressure
Not influenced by the speed/config/weight of aircraft

How much fuel required to produce thrust

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12
Q

Thrust is limited by (Jets)

A

RPM and Temperature

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13
Q

What speed is propeller thrust maximum

A

Zero Speed

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14
Q

SFC Formula

A

Fuel flow
————
Thrust

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15
Q

Specific Range Formula

A

True Airspeed
——————-
Total Fuel Flow

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16
Q

Specific Ground Range Formula

A

GS
——-
Fuel Flow

17
Q

Factor that influence VMC

A

Higher thrust the larger the asymmetry = higher VMC

18
Q

VMC in a descent

A

VMC increases as more power/thrust = larger asymmetry

19
Q

High Altitude on VMC and V1

A

VMC and V1 reduces

Density is low/lower thrust/longer acceleration
V1 = highest speed to abort/more runway so needs to be less to stop

20
Q

Low Altitude on VMC and V1

A

VMC and V1 increase

21
Q

Factors reducing V1

A

Runway wet/slipper/contaminated
Higher altitude

Performance (23 decks)

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