The G103 Twin II (originally designated the G 118) is a high-performance two-seat sailplane manufactured in Germany by Grob Aircraft.

The G103A Twin II Acro variant features strengthened mainspar caps and steel control pushrods which permit greater aerobatic performance.

[2] The aircraft (N424GL) was flown out of the Ridge Soaring Gliderport, Pennsylvania, USA, by pilot Thomas Knauff and crew, Rob Gannon.

and the Pennsylvania Sports Class; Distance around a Triangular Course of 100 km; Pilot David Bradley, Passenger Jim Vincent.

The results of these tests restored the original flight speed limitations and maneuver operations for the Twin II and allowed the Twin II Acro only basic aerobatic maneuvers (spins, lazy eights, chandelles, stall turns, steep turns, and positive loops).