S80 Version 4.92 November 2014
Page 45 of 61
You can modify the polar by changing coefficients a, b and c. A polar is defined as a
quadratic equation with the parameters a, b, and c. Use the SeeYou program (Tools->Polar)
to calculate coefficients a, b and c for a given glider’s polar. The program requires three sink
points entered at selected speeds (e.g.: 100 km/h, 130 km/h, and 150 km/h). The program
will calculate the values of a, b and c, which should be noted and entered into the LXNAV
S80.
Class: Options for Touring, Ultralight, World, Doubleseater, Club, 18-meter, 15-meter,
Open, Standard, and Unknown are available.
a, b, c: Options can be adjusted or entered for a non-listed glider.
Stall speed is used to generate stall warnings which are available with integrated Voice
module.
Reference load (wing loading) value represents the value at which the polar was
measured.
Reference weight corresponds to the weight value at which the polar was measured.
Maximum takeoff .weight is the maximum take-off weight allowed for the glider. It is
not used in the calculation; it is just a reminder to the pilot of the maximum take-off weight.
Empty weight is weight of the glider without the pilot and ballast.
Empty glider weight is a weight of empty glider. This number can be found in a glider
book.
Pilot weight is the weight of the pilot with parachute and baggage.
Co Pilot Weight is the weight of the co-pilot with parachute and baggage.
To Next Page
Loading...
