Polar Curve

Randkar, the French distributors of the Alatus-M, have published the above Polar Curve on their website (http://randkar.free.fr/eng/alatus.htm).

From this we can try to get approximate glide ratios:

60kph = 37mph = 3256fpm

Clean sink = 120fpm = 27:1

Full Flap sink = 430fpm = 7.5:1

80kph = 50mph = 4400fpm

Clean sink = 190fpm = 23:1

Full Flap sink = 900fpm = 4.9:1