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.
7-769: 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
14-669: 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. On 28 September 1981
21-475: Is a glass-reinforced plastic two-seat sailplane that was developed in Germany in the 1970s by Grob Aircraft AG as a counterpart to the single-seat G 102 Astir , then in production. Construction throughout is similar, although to preserve the centre of gravity of the design, the wings were given a slight forward sweep. While many two-seat derivatives of single-seat sailplanes have fixed undercarriage, due to
28-528: The Pennsylvania Sports Class; Distance around a Triangular Course of 100 km; Pilot David Bradley, Passenger Jim Vincent. In 2003 Service Bulletin 315-64/2 reduced the maximum admissible airspeeds and prohibited aerobatic flight. This was due to reports that the design of the fuselage may not have been sufficient to sustain limit loads during certain maneuvers and during flight at certain speeds. Grob completed further investigations into
35-748: The Twin II took the world Out & Return record for two-seat sailplanes (1000.88 km/ 621.92 miles). The aircraft (N424GL) was flown out of the Ridge Soaring Gliderport , Pennsylvania, USA, by pilot Thomas Knauff and crew, Rob Gannon. On May 14, 1996 the Twin II G103A took the Pennsylvania State Open Multi place class; Distance around a Triangular Course/Speed over a Triangular Course of 100 km; Pilot David F. Bradley, Sr. Passenger Jim Vincent. and
42-617: The added space restrictions created by the second seat, Grob devised a novel retraction system for the Twin Astir. The single wheel was designed to rotate 90° sideways before retracting "flat" under the rear seat, resulting in a rather unusual seating position. This was only incorporated in early examples, later on, the wheel was fixed. Factory options offered to customers included whether the front seat should be equipped with flight instruments, and whether water ballast capacity should be installed. Production continued until around 1980, when it
49-856: The effects of certain flight conditions on the fuselage structure and the development of corrective procedures. Further static strength tests were conducted to verify the safety margin of the fuselage. 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). An approved modification, when incorporated, restores full acrobatic status to these sailplanes. Royal Air Force Gliding and Soaring Association General characteristics Performance Related lists Grob G 103 Twin Astir The Grob G 103 Twin Astir
#354645