ASW 24 stalls in turnback after low-altitude aerotow release

An ASW 24 crashed during a CG-hook aerotow at Dunstable; the pilot was fatally injured and the glider destroyed. After liftoff the glider climbed high behind the tug and oscillated. Below ~15 m AGL the tow rope detached for undetermined reasons. The glider continued climbing to ~25 m AGL, then entered a steep left turn (~60° bank) to return. At that bank the stall speed rose to ~105 km/h; the glider stalled, spun, and struck the ground nose-first at the western boundary. Investigators cited the low-altitude turnback and the destabilising CG-hook aerotow configuration.

1. West Run aerotow takeoff: The ASW 24 launched by aerotow from the West Run at Dunstable on the CG hook; a northerly breeze gave a 5-10 kt right crosswind, clear visibility, and broken cloud above 1,000 ft.
2. CG-hook only, known destabilising: The glider had a CG hook only, no nose hook; published guidance lists CG-hook-only aerotow as an added risk factor for tug-upset, since the hook geometry sits below the glider's CG.
3. Tow rope detaches below 15 m AGL: While still below the tug's profile, below about 15 m AGL, the tow rope detached; possible causes included a hook back-release, inadvertent handle operation, or deliberate release.
4. Startle/surprise likely: An unintentional release would likely have caused startle or surprise, briefly impairing performance and delaying or degrading the planned response of landing straight ahead.
5. Climb to ~25 m, steep left turnback: After separation the glider climbed to about 25 m AGL, then entered a steep left turn exceeding 60° bank, where stalling speed rises sharply; airspeed fell through the turn.
6. Stall and spin in steep turn: The steep bank and falling airspeed put the glider into an unsustainable regime: the left wing dropped, the nose yawed left, and it entered an incipient spin.
7. Nose-first ground impact, fatal: The glider struck the ground nose-first near the airfield's western boundary and was destroyed; the pilot was fatally injured. A turn back proved unachievable from that height.