G103 Twin II

G103 Twin II

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.[1]

A total of 549 were produced before it was succeeded in production by the G103C Twin III in 1989.


Crew 2
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
Power plant
Maximum speed (Sea level)
Maximum speed (High altitude) 250 km/h (160 mph, 140 kn)
Combat radius
Ferry range
Service ceiling
Rate of climb
Wing loading
Design load factor +5.3/-2.65 at Va


Related Armament

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