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Groundschool : Module 1 > Principles Of Flight > Flashcards

Principles Of Flight Flashcards

1
Q

What is Speed?

A

The rate of change of distance

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2
Q

What is mass

A

The quantity of matter

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3
Q

1kg = … lbs

A

2.2lbs

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4
Q

What is acceleration?

A

Rate of change of velocity (m/s^2)

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5
Q

What is a force?

A

A push/pull reaction
mass x acceleration

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6
Q

What is weight?

A

Force exerted on a body by gravity
mass x gravity (g=9.81m/s^2)

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7
Q

What is Density?

A

Mass per unit volume
mass/volume

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8
Q

What is pressure?

A

Force per unit area
Force/Area

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9
Q

What is Energy?

A

Capacity for doing work
force x distance

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10
Q

What is Power?

A

(force x distance) / time

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11
Q

Newtons 1st law

A

Body remain at rest unless acted upon by external force

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12
Q

Newtons 2nd law

A

Acceleration experienced by a body is proportional to force applied and inversely proportional to mass

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13
Q

Newtons 3rd law

A

equal/opposite recation

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14
Q

Air properties

A

Incompressible fluid
little/no cohesion between air molecules (friction)

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15
Q

What is air density effected by?

A

Humidity
Temperature
Pressure

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16
Q

good performance occurs when density is … We get tihis with…

A

High

Low humidity
Cold temperature
High pressure (low pressure altitude)

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17
Q

What is static pressure?

A

Pressure felt by an object due to mass of column of air its in

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18
Q

What direction is static pressure felt in?

A

All directions
At right angles to object surface

19
Q

How do you measure static pressure?

A

Static port

20
Q

What happens when the air is fed into the static port chamber?

A

Changes in static pressure causes aneroid capsule to compress/expand
Compress - high sp
expand - low sp

21
Q
A
22
Q

What is Dynamic Pressure?

A

Pressure felt due to motion through an airmass

23
Q

What direction is Dynamic pressure felt in?

A

Acts from one particular angle

24
Q

Total Pressure equation

A

Static pressure + Dynamic Pressure
Ptot = Pstat + q (Dynamic)

25
Q

Dynamic pressure equation

A
26
Q

How to measure Dynamic Pressure?

A

Pitot Probe

27
Q

How does the Pitot Tube work?

A
  1. aligned with airflow (pressure datum) and collects Ptot pressure
28
Q

Pitot Tube explanation (~)

A

Static pressure in capsule/chmabere cancel out
Ptot fed into capsule and tries to inflate

29
Q
A
30
Q

What does IAS stand for?

A

Indicated Air Speed

31
Q

What is IAS a measure of?

A

Dynamic Pressure

32
Q

Why do we use IAS?

A

Determines how effective wing is and if can produce enough lift to fly
IAS gives us our speed relative to stall

33
Q

What are the IAS errors?

A

Instrument
Postion
Manoeuvre

34
Q

Instrument error

A

Instrument imperfections > wear/tear

35
Q

Position Error

A

Due to misalignment of pitot probe (can be tested/corrected) - pressure error

36
Q

Manoeuvre error

A

Change in pressure datum whilst manoeuvring - not correctable

37
Q

CAS stands for?

A

Calibrated Air Speed

38
Q

What is CAS

A

IAS corrected for instrument/position error
If a/c has air data computer - will display CAS

39
Q

What is a compressibility error?

A

Air molecules compress in pitot probe > artificial rise in pressure
Causes overhead a/c speed

Insignificant below 300kts

40
Q

What is EAS?

A

Equivalent Airspeed

CAS corrects for compressibility

Not used by pilots - only used for a/c designers

41
Q

What is TAS?

A

How many air molecules are entering the pitot probe each second

42
Q

What are the 3 types of airflow?

A

Streamline

Turbulent

Vortex - 3D Airflow

43
Q

What is Bernoullis Theorem?

A

Sum of pressure energies of an incompressible fluid within a sreamtube

44
Q

What is the camber line?

A

A line equidistant apart between the upper and lower edges of the aerofoil

Groundschool : Module 1 (38 decks)

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