The G103 Twin II (originally designated the G 118) is a high-performance two-seat sailplane manufactured in Germany by Grob Aircraft. The aircraft is of T-tail configuration, and is fitted with upper-surface airbrakes and a non-retractable undercarriage. Of fiberglass construction, it is designed for training, high performance cross-country racing and simple aerobatic flying.
Design and development
The G103 Twin II (a.k.a. the Twin Astir II) is the successor of the original G103 Twin Astir with a nose wheel and a fixed six-inch main gear fitted behind the center of gravity – The main wheel is equipped with a hydraulic brake. Modified ailerons produce a substantially improved roll response compared to the previous model. Approach control is by top surface Schempp-Hirth type airbrakes. The G103A Twin II Acro variant features strengthened mainspar caps and steel control pushrods which permit greater aerobatic performance. The G103 also has a FAA approved modification kit for all-hand control for handicapped operation.
The Royal Air Force Air Cadets acquired 100 Twin II Acros (known in service as the Grob Viking T1) in 1984/85 to replace the aging Slingsby gliders of the RAF Volunteer Gliding Schools.
A total of 549 were produced before it was succeeded in production by the G103C Twin III in 1989.
|Length||8.18 m (26 ft 10 in)|
|Wingspan||17.50 m (57 ft 5 in)|
|Heigh||1.55 m (5 ft 1 in)|
|Wing area||17.8 m2 (191 sq ft)|
|Empty weight||390 kg (869 lb)|
|Gross weight||580 kg (1,280 lb)|
|Max take off weight|
|Maximum speed (Sea level)|
|Maximum speed (High altitude)||250 km/h (160 mph, 140 kn)|
|Rate of climb|
|Design load factor||+5.3/-2.65 at Va|
- UK Royal Air Force– 52 aircraft