Interesting...

Deuche Folksegel Flugzeug Gmb. proposed a very interesting and
elegant solution to the notorious problem of very slow and painfully
long self lunch of all German motor gliders. Simple electromagnetic
clutch between the motor and the glider main wheel will allow the
glider to gain the take off speeds in time much shorter then it was
possible in traditional configuration that is the propeller only
acceleration. All power of the motor is being initially transfer to
the glider main wheel. Clutch is disengaging after the glider is
reaching the 7/8 of its takeoff speed. Test performed on 04.01.2010
showed that it is possible to take off a two sitters like DG1001, from
the runway as short as 120 feet…or with a headwind, even shorter.