Airspeed Airspeed is the most important thing and dictates if the aircraft will fall out of the sky or not. It is the speed that the air flows over the wings at. It isnt the speed that the plane is traveling at. An example of this is if the airspeed is 150 kph and the plane is flying into a 20 kph head wind the ground sped of the aircraft would be 130 kph.
Stall A stall is what happens if the air speed gets slow enough. When the wing moves through the air it produces lift when the wing is moving so slowly through the air that lift is no longer developed the wing is said to be stalled and will fall
Showline Show line is the line along which a performance is flown, it is usually parallel to the runway. There are different show line barriers for different aircraft this barrier can also be called the "dead" line and refers to the area between the performance line and the spectators. The distance away from the crowd is regulated by law. Propeller powered aerobatic planes aircraft have to be 500 feet away, 1,000 feet for warbirds and 1,500 feet for jets. Planes may not be involved in aerobatics any closer than those lines.
Entry speed Entry speed is a target or desirable airspeed required at the beginning of a maneuver, this ensure that the aircraft can complete the maneuver successfully.
Red Line The red line is the maximum speed the plane is permitted to achieve this is shown by a red line on the airspeed indicator. It is to do with the aircrafts structural limits it could go faster, but it might start shedding parts.
Centrifuge
A centrifuge is a
piece of equipment that spins around with a person in it. It accelerates so fast
that the occupant feels the effect of an increased acceleration and experiences
an increased G Force.