Wills Wing Fusion 141, Руководство по эксплуатации для владельца

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Towing
Because of the lack of a kingpost and top rigging on the Fusion design, tethering the glider by the nose,
such as is commonly done during platform towing operations, creates the potential for overloading the
keel tube of the glider which could result in a structural failure. To avoid overloading the keel, any
tether line attached to the nose should pull as much as possible in line with the keel, and in no case in a
direction more than 45 degrees below the line of the keel tube itself.
As the following table indicates, the load on the keel is also very sensitive to pilot weight and CG
position. With a nose release tether angle of 45 degrees, the load on the keel is marginally acceptable at
a pilot position corresponding to a free flight airspeed of approximately 30mph. With an arms extended
pilot position, the keel will be overstressed and the front wires will be quite slack.
A keel angle of 7 degrees has been used for platform tow operations, which allowed the glider to start
lifting off the chocks at approximately 30 m.p.h.