Glass gliders are "hot" only if you have only flown old high drag non
glass gliders. Stop training in those.

As soon as I find someone to sponsor my flying. Whether we like it or
not, K-21 is three or four times more expensive than K-13. Yep, I went
solo in a K-13. Yep, I could have choosen a club that used K-21 for
training. Going solo would have cost me approximately twice as much.

Your club instructors should regurally fly modern glass gliders, how else will they be
able to pass on the necessary skills to the students when it is time to fly a single
seater made from glass?

I have no doubts about their skills. Most of them actually own glass
gliders.

If you train in a modern glass glider, transitioning to a single seat
glass glider is easy, with proper instruction. It is done in Germany
and elsewhere all the time.

I suppose so.

Bartek (who will gladly fly anything with wood, metal or glass wings)