Flight performance measurement
Flight performance measurement refers to a method for determining the aerodynamic potential of aircraft , in particular gliders . In addition to the aerodynamic potential or performance of an aircraft, flight performance in the broader sense also includes the flight characteristics and the ability of the pilot.
There are four methods of determining flight performance:
- Altitude step method : To determine the flight performance of a glider using the altitude step method, many flights are required in calm weather.
- Direct measurement of the glide angle : the glide angle can be determined from the flight position relative to the horizon and the angle of attack.
- Imposition process: Here the entire speed range of a glider is used. You start at a high speed and let the aircraft "shoot out", whereby the gradient of the speed reduction should be controlled so that a constant altitude is flown. By measuring the speed, the occurring acceleration and the altitude, the glide ratio or the polar of the glider can be determined.
- Comparison flight : The flight performance is determined by comparing it with a "normal". This standard represents a highly precisely calibrated aircraft that has previously been calibrated using one of the three methods mentioned. In the comparison flight procedure, the assumptions are made that the two aircraft are moving within the same air mass and that the mutual influence is minimal or nonexistent.
See also: Performance class