Mike,
I've found the FAI definition which is:-
d. ULTRALIGHT a glider with a maximum takeoff mass not exceeding 220kg
Thus why the Woodstock (which is a pretty conventional wooden sailplane)
qualifies and I guess holds most of
the world records for this category. Not for long I suspect as there are
a number of glass ships coming out of Europe
which are around 120kg empty with much higher performance stats
eg. http://www.albastar.si/
I believe that they launch them behind a trike, or even ultralight.
rgds
Pete
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