FreeX X-one Mode D'emploi page 80

Its marvellous launch characteristics predetermine the X-ONE for
winch towing.
Basic posture and inflation technique are pretty much the same
as the standard mountain launch but you should use less brakes
for a safe launch from a flat field.
Because of its flexibility it does not pose any problem at all to
perform corrections of the flight direction with the X-ONE when
on the tow line. To avoid the risk of an unintentional one-sided or
full stall, adapt the use of the brakes to the situation.
Regulations for winch towing must be observed. Only permitted
equipment may be used. A winch towing training is an essential
prerequisite for safely carrying out this launch method!
The speed range of the X-ONE using only the brakes is relatively
high. Adapting the speed to every flight situation is essential for
performance and safety.
You will achieve best glide (in calm air) with your X-ONE by not
applying any brake at all. The best sink rate is achieved with both
brakes pulled about 25-30 cm.
After this point, the brake pressure will increase significantly, but
the sink rate will not improve any more. Flying at minimum speed
involves the risk of an unintended stall - for instance due to gusts
- even though the stall point lies at about 65-80 cm and the stall
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