115 kph is about 63knots, which is close to the ideal
speed for launching a K21 (I reckon 65 knots), which
I guess equals the best L/D speed allowing for the
extra wing loading caused by the cable pull. Any faster
or slower than this will give a less high launch as
the glider is flying less efficiently. 90 kph is pretty
close to the loaded stall speed.

Del Copeland

At 22:24 01 November 2007, Andreas Maurer wrote:

Definitely not with our 280 hp Turbo Diesel winch and
an ASK-21.

90 kp/h gets about 350 meters, 115 kp/h gets over 400
meters.



Bye
Andreas