Subsonic Areo Dynamics Flashcards
what is inertia?
the resistance to change in motion
1nm = ?sm
= 1.15sm
1nm = ?km
= 1.85km
1 imperial gallon = ? US gallons
= 1.2009 US gallons
1 imperial Gallon = ?Litres
= 4.54 Litres
How would you convert 1 Imperial gallons to 1 Litre using US gallons?
1 x 1.2009 = US gallons
1.2009 x 3.78 = litres
what is Boyles Law?
as volume decreases pressure will increase. this relationship is inversely proportional
what is Charles law?
as temperature increases, volume increases proportionally.
what is MSL density?
1.225kgm3
what is MSL temperature?
15 degrees Celsius
what is MSL pressure?
1013 Hpa
define density altitude
altitude in ISA at which the prevailing density would occur.
what is the density altitude equation?
PA + (118.8 X ISA DEV)
How does dynamic pressure increase with Airspeed?
with the square of the increase in TAS
How does IAS increase with TAS?
directly proportionally
thickness to chord ratio equation?
(max thickness/chord) X 100
what is the average thickness to chord ratio percentage?
between 5 -20%
what is the aspect ratio?
(wingspan/chord) or (wingspan^2/area)
what is the Taper Ration Equation?
(Tip Chord / Root chord)
define aerodynamic centre?
the of which lift acts with a constant nose down pitching moment irrespective of any changes in AoA.
what happens to the CoP of a symmetrical aerofoil when angle of attack increases?
the CoP remains constant.
what happens to the CoP of a cambered aerofoil when the AoA increases?
the CoP moves forward
what happens to the stagnation point when AoA increases?
stagnation point moves downward.
what happens to the stagnation point when AoA decreases?
stagnation point moves upwards.
