Operation Manual

V7 Version 3.01 October 2013
Page 29 of 48
5.3.9 Polar and Glider
Use this dialogue to enter glider polar and other glider properties. As a default polar a
standard class glider is enabled automatically .
Polars for most modern gliders are already prepared. Use Glider type control, to list between
preloaded glider polars.
All glider data will be copied from the chosen polar. The check the best glide ratio and
minimum sink rate, to see if the polar data matches the glider performance, you may look in
MacCready setting menu. 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 V7.
Stall speed is used to generate stall warnings which are available only with integrated Voice
module (Not integrated in LXNAV V7).