Grob G103c Twin III

G103C Twin III
Role	Two-Seater Class sailplane Type of aircraft
National origin	Germany
Manufacturer	Grob Aircraft
Introduction	1989
Status	Production completed
Number built	115 (13 Twin III and 102 Twin III Acro)
Developed from	Twin II
Variants	Twin Astir

The G103C Twin III is a high performance tandem two-seat sailplane made by Grob Aircraft. It replaced the Twin II in production and features a new triple-trapezoidal wing, automatic elevator connection, lower control forces and higher airspeed limitations.

Most Twin IIIs (102 of 115 built) were Twin III Acro models, with G-Limits of +6/-4g. However, aerobatic maneuvers were limited in 2003 by an airworthiness directive^[1] and could only be reinstated with fuselage reinforcements.^[2]

Data from manufacturer^[3]

General characteristics

• Crew: 1
• Capacity: 1 passenger
• Length: 8.18 m (26 ft 10 in)
• Wingspan: 18 m (59 ft 1 in)
• Height: 1.55 m (5 ft 1 in)
• Wing area: 17.5 m² (188 sq ft)
• Aspect ratio: 17.1
• Gross weight: 600 kg (1,323 lb)

Performance

• Never exceed speed: 280 km/h (170 mph, 150 kn) (manoeuvering speed 185 km/h)
• g limits: +6 -4
• Maximum glide ratio: 38

• Grob G103 family
• Grob G103 Twin Astir
• Grob G103a Twin II

Wikimedia Commons has media related to Grob G 103C Twin III.

• Homepage of Grob Aircraft AG