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Le G109B

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The GROB G109B is a two-seat motorglider with T-type stabilizer, fixed gear and airbrakes. It is classified TMG. It was designed by Burkhart Grob GmbH. It is a side by side seating with a classical undercarriage with a steerable tailwheel. Fuselage and wings are made of industrial carbon-fiber and glass-fiber composites.

154 G109A et 322 G109B were built from 1983 untill 1990. The Royal Air Force has ordered the last 54 of them, the Vigilant MK 1, for training of their cadets.

The engine is made by Grob, the GR 2500. It's an aircooled 4 stroke flat engine. 100LL AVGAS or automobile 98 octane leaded fuel can be used.

The G109B is famous for its aerodynamic performances and ergonomically designed cockpit. It is easy to handle, good natured and has a respectable manoeuverability. It banks very gently without spinning. G109B pilots enjoy flying in confort with glider like visibility and side by side seating.

In 1983 the G109 has extended the World altitude record to 6406m (21018ft) and the World altitude gain to 5042m (16544ft).

The G109B specifications are:

  • Sizes: wing span17.4m, wing area 19.0m², Eppler profile E580
  • Mass: MTO 850Kg, payload 245Kg, fuel 100l (72Kg), max wing load 44.7Kg/m²
  • Engine: GROB 2500, 3400 RPM 95 HP, 12l/h at 170 Km/h
  • Performance with engine: 240 Km/h max, 190Km/h cruise, 73 Km/h stall speed, initial climbing rate 3.3m/s, take off distance 196m and 320m above 15m, max cruise distance 1800Km
  • Soaring performance : max glide ratio 30/1 at 115Km/h minimum sink 1.1 m/s at 108Km/h
  • Propeller: 3 positions variable pitch propeller Hoffmann HO-V 62 R/L 160 BT

 

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