The Association, the manufacturers, the schools, and above all, the pilots. Only the pilot can decide when he flies, where he flies, what he flies, and how he builds up in the sport. He is Chief Test pilot with many years of experience. At present the DHV has feedback of incidents with current tested gliders showing that some pilots cannot handle the behaviour of the gliders. The reports come from schools, safety courses and pilots.
Problems arise in all classes from the fast turns after a side tuck.
Particularly noticeable are those in Classes 2 and 2-3. The gliders turn with fast speed and show distinct tilting along the roll axle with simultaneous forward dive on the pitch axle. The pilots are surprised about the dive and often react wrong. They don't control, or do it too late, or so hard that loss of airflow is experienced. A further problem is the stable steep spiral in discussion.