Speed 12 Flashcards
What is speed?
The rate at which distance is covered or the rate of change of position
What are the different units of speed used?
Mph Kts FPS Kph Mach
What is pitot pressure?
The pressure of the undisturbed Air obtained by the pitot tube.
What is the pitot pressure equation?
Static pressure + dynamic pressure
How does the airspeed indicator remove static pressure?
By allowing it to impinge the outside of a flexible metal capsule that is fed with pitot pressure.
List the 5 Errors the Air Speed Indicator suffers from
1) Manufacturer Errors
2) Position error
3) Manoeuvre error
4) Density error
5) Compressibility error(speeds above 300kts)
What is the speed read directly from ASI?
IAS
What is the speed after the IAS has been corrected for pressure and instrument errors?
Rectified airspeed (RAS)
What is the airspeed once the RAS has been corrected for density errors. The actual speed of the aircraft through the air?
True airspeed (TAS)
What is the speed of the aircraft over the surface. TAS corrected for wind?
Ground speed GS
What is Mach Number?
TAS expressed as a fraction of the local speed of sound.
The closer it is, the slower the local speed of sound. True or False?
True
What is the average speed of sound?
660kts
What is subsonic l?
Less than M0.8
What is Transonic?
M0.8-1.2
