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Principles Of Flight > Subsonic Areo Dynamics > Flashcards

Subsonic Areo Dynamics Flashcards

1
Q

what is inertia?

A

the resistance to change in motion

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2
Q

1nm = ?sm

A

= 1.15sm

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3
Q

1nm = ?km

A

= 1.85km

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4
Q

1 imperial gallon = ? US gallons

A

= 1.2009 US gallons

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5
Q

1 imperial Gallon = ?Litres

A

= 4.54 Litres

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6
Q

How would you convert 1 Imperial gallons to 1 Litre using US gallons?

A

1 x 1.2009 = US gallons

1.2009 x 3.78 = litres

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7
Q

what is Boyles Law?

A

as volume decreases pressure will increase. this relationship is inversely proportional

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8
Q

what is Charles law?

A

as temperature increases, volume increases proportionally.

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9
Q

what is MSL density?

A

1.225kgm3

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10
Q

what is MSL temperature?

A

15 degrees Celsius

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11
Q

what is MSL pressure?

A

1013 Hpa

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12
Q

define density altitude

A

altitude in ISA at which the prevailing density would occur.

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13
Q

what is the density altitude equation?

A

PA + (118.8 X ISA DEV)

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14
Q

How does dynamic pressure increase with Airspeed?

A

with the square of the increase in TAS

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15
Q

How does IAS increase with TAS?

A

directly proportionally

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16
Q

thickness to chord ratio equation?

A

(max thickness/chord) X 100

17
Q

what is the average thickness to chord ratio percentage?

A

between 5 -20%

18
Q

what is the aspect ratio?

A

(wingspan/chord) or (wingspan^2/area)

19
Q

what is the Taper Ration Equation?

A

(Tip Chord / Root chord)

20
Q

define aerodynamic centre?

A

the of which lift acts with a constant nose down pitching moment irrespective of any changes in AoA.

21
Q

what happens to the CoP of a symmetrical aerofoil when angle of attack increases?

A

the CoP remains constant.

22
Q

what happens to the CoP of a cambered aerofoil when the AoA increases?

A

the CoP moves forward

23
Q

what happens to the stagnation point when AoA increases?

A

stagnation point moves downward.

24
Q

what happens to the stagnation point when AoA decreases?

A

stagnation point moves upwards.

Principles Of Flight (6 decks)

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