Principles of flight Flashcards
Kts to Ms-1 conversion ?
x 0.5144
Kg to Lbs
x 2.2
G (Acceleration due to gravity) value ?
9.81 M/s2
Density units
Kg M3
Acceleration units
M/S2
Pressure Equation
Pressure = Force / Area
Pressure units (in PoF)
N/M2
Work done equation
Work done = Force x distance
Power is defined as ?
Rate of energy use
P= Force x Speed
Newtons 1st law
A body at rest or moving at a constant rate will remain so until acted upon by an external force.
Newtons 2nd law
The acceleration experienced by an object id proportional to the force applied and inversely proportional to the mass. (F=MA)
Newtons 3rd law
For every action there is an equal and opposite reaction
What is Air density affected by ? (Decrease)
Humidity increase
Temperature increase
Pressure decrease
Static pressure relationship with (pressure) altitude ?
Static pressure reduces as altitude increases
Density relationship with (density) altitude ?
Density increases as altitude decreases
What is static pressure ?
The pressure felt by an object due to the mass of the column of air the object is in.
Kinetic energy formulae
1/2 M V2
1/2 (rHo) V2
Dynamic pressure equation
1/2 (rHo) V2 (Where V is the TAS of the airflow)
IAS is a measure of what ?
Dynamic pressure
How is dynamic pressure measured?
Pitot-static system
(Takes static pressure away from total pressure)
Bernoulli’s theorem .. ?
In a flow of ideal fluid, the sum of pressure and kinetic energy remains constant
Pressure difference around an aero foil (Static pressures, so opposite to dynamic)
Relatively Low pressure above
Intense low pressure at the front on the surface above
Relatively High pressure below
Angle of attack is ? (2D flow)
Angle between the aero foils chord line and the direction of the airflow
A positively cambered aerofoil is when …
The mean camber line is above the chord line