OscarCVox wrote:

Gliders susceptable to this often have features in common.
Light weight
High mounted wings
nose wheel or skid
The whole thing made worse by inexpert winch drivers in a powerfull winch used
to launching heavy 2 seaters

The worst experience I have ever had was in one of those PW5 things. It rotated
until the wheel on the tail hit the ground hard then took off like a scalded
cat. With full forward stick I was about 200ft before I managed to resume
control. Scary.
With a nose wheel or skid they rock back on the all out signal presenting the
wings at a large angle of attack before the elevator has a chance to become
effective.

I think the most important factors in the cas of the PW5 are the
high position of the tail skid, allowing for a high pitchup before
leaving the ground, and a to aft position of the CG hook. The ASK23
is also a light weight glider with high mounted wings and a nose
wheel, but it doesn't exhibit this behavior.