Grob - Twin Astir II
| Type designation | G103 Twin II |
| Competition class | No Class |
| Number built | 549 |
| Crew | 2 |
| Length | 8.18 m |
| Height | 1.55 m |
| Cockpit width | |
| Cockpit height | |
| Wingspan | 17.5 m |
| Wing area | 17.8 m² |
| Aspect ratio | 17.1 |
| Wing profile | Eppler E 603 |
| Empty mass | 368 kg |
| Maximum mass | 580 kg |
| Wing loading | 32.6 kg/m² |
| Maximum speed | 135 kt |
| Speed in rough air | 92 kt |
| Stall speed | |
| Minimum sink rate | 0.75 m/s at 43 kt |
| Best glide ratio | 35 at 56 kt |
| Roll rate |
Histoire:
The ‘Twin II' is a high performance two-seater sailplane made by Grob Aerospace . The aircraft is of T-tail configuration, and is fitted with a non retractable undercarriage and upper surface airbrakes. Of glass fibre construction, it is designed for training, high performance, and simple aerobatic flying.
The G-103 A Twin II (a.k.a the Twin Astir II) is the successor of the 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 Schemmpp-Hith type airbrakes. The Twin II Acro is similar to the earlier model, but with strengthened mainspar caps and steel control pushrods which permit greater aerobatic performance. The Royal Air Force acquired 100 Acros (known as the Viking T1 ) for its air cadet training program. The G103 also has a FAA approved modification kit for all-hand control for handicapped operation. The Twin II was succeeded by the Grob 103c Twin III in 1989.
(Source: wikipedia,sailplanedirectory.com)