LO 100 right wing fails during aerobatic training

The pilot of a LO 100 was lightly injured after the glider's right wing failed in pre-comp aerobatic training and he bailed out at ~80-100 m AGL; parachuted safely, aircraft destroyed. Released at 1,200 m AGL, in the entry-class compulsory — spin turn with 3/4 loop to inverted, then 45° down-line with half-roll to upright — the right wing broke during the pull-out. Debris scattered along a 300 m strip; the salvaged g-meter peaked at +7.2 g. Takeoff mass was 280 kg against the 245 kg aerobatic limit — body weight alone exceeded it. Prior landing-accident damage to the wood spar could not be ruled out; cause indeterminate.

1. Aerobatic training launch (pre-comp): The pilot took an aerotow launch for a training flight before an aerobatic competition, under cumulus based near 1,200 m AGL, and later reported strong gusts before the accident.
2. Aerobatic mass limit exceeded by pilot: Pilot weight, empty mass and rescue parachute gave a takeoff mass of 280 kg against the 245 kg aerobatic limit — the pilot's own body weight alone exceeded that limit.
3. Prior spar damage could not be excluded: The airframe had been damaged in a 1999 landing accident; the wing inspection then was limited and irregular. Internal spar damage from that accident could not be excluded.
4. Pull-out from 45° down-line after roll: After release at 1,200 m AGL the pilot flew a spin turn with a 3/4 loop to inverted, then a 45° down-line with a half-roll upright. A witness saw the down-line flatter than briefed.
5. Right wing fails at ~7.2 g recorded: The right wing failed in the pull-out, scattering debris up to 300 m away. A recovered accelerometer read +7.2 g, exceeding the operating limit by 1.37x, within the ultimate safety factor.
6. Bailout at 80-100 m AGL; pilot saved: The fuselage, wing and tail hit a concrete apron; the pilot bailed out at 80-100 m AGL, landing safely with abrasions only. The aircraft was destroyed; factors included overload and a gust.