On Nov 1, 1:41*pm, Udo wrote:
The 57 kt versus 50 kt can be explained by the fact, that the second
glider was a little higher before it went through the same point in
space as glider A. *Glider A had a wingloading of 8 lb/ft^2 Glider B
8.3 lb/ft^2. It was heavier by 3.6%

Were they the same glider model? It's not clear what point you are
trying to make or understand. Two gliders flying the same distance at
different speeds will have different performance, particularly if they
are not the same glider type and they fly even slightly different
courses. The difference in starting speed between the two gliders
doesn't matter. The only things that really matter in this example are
the cruise speeds and the difference between starting energy and
finishing energy - and of course the altitude loss over the prescribed
distance.

I'm dying to know the question behind your question. Is there a lesson
in this for all of us?

9B