Grob G103c Twin III

G103C Twin III
General information
TypeTwo-Seater Class sailplane
National originGermany
ManufacturerGrob Aircraft, now LTB Lindner
StatusProduction completed
Number built115 (13 Twin III and 102 Twin III Acro)
History
Introduction date1989
Developed fromTwin II
VariantTwin 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]

Specifications (Twin III Acro)

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

See also

References