I have seen two different ventus b's, one with trailing edge brakes and newer s/n, that i own, with conventional.
Newer has a bit different rod configuration, no flap shaft, wing fairings on fuselage, etc.. I believe it is the same ventus c except wing tips.

Both gliders came from factory with 15m and 16.6m tips.

Mine was redesignated from b to c (TN 349-11) some time later.
Redesignation was possible, probably, because it was sold by factory with applied bulletins 349-18 and 349-19.

This is how i came up with ventus c and 16.6 meter tips.


SH said that they do not provide 17.6 meter tips anymore.

BR,
Martynas