Pilot's report.

I fly away from the slope and initiate a sequence of two loopings. At the end of
the first loop, properly done, I check my speed and see 80 km/h, which is not
enough for the second one. Therefore, I increase my speed without finding out
that I’m overshooting the VNE (130 km/h) because the speed indicator display is
always late with respect to reality. I was certainly already beyond 110 km/h
when I accelerated even more. Before, during other looping sequences I ended up
slow at the top of the loop, so I tried to make sure I had enough speed.

During the next resource, I pulled unusually too much on the stick and feel
directly the Gs, I overshoot all the load factors that the sailplane can
withstand

Manufacturer's report.

Like all sailplanes the Archaeopteryx is designed, calculated and tested for
operation within defined limitations. In the lower speed range up to the maximum
maneuvering speed of 85 km/h and with proper flap setting the pilot is allowed
to use full controls. The loads which can be reached within this speed range do
not exceed the structural strength of the airplane. In the upper speed range, in
the case of the Archaeopteryx from 85 to 130 km/h the pilot may only use small
control deflections and the air must not be turbulent. If you use too much
controls in this speed range, i.e. you are manoeuvring hard, or the control
deflections are harsh, aerodynamic loads can appear which exceed the structural
strength of the airplane. In extreme cases this will lead to the destruction of
the airplane.