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The Grob G 109 is a motorglider developed by Grob Aerospace of Mindelheim Mattsies of Germany and which first flew in 1980. The basic concept is that of a two seater self launching motorglider with a 17.4 meter wing span. The pilot and passengers sit side by side, giving them good views from the large perspex canopy.
The basic airframe construction is in fibreglass. Total weight is around 1870 lbs with a load of 506 lbs. Cruising speed is in the region of 60-100 knots on the 95 horsepower engine which can give the aircraft a top speed of 130 knots. The engine is built by Grob and is the Grob 2500E1 which is a horizontally opposed four-cylinder, air-cooled engine that can be turned off in flight with its propellers feathered. The aircraft then becomes a pure glider, with a best glide ratio of around 1:28.
This aircraft is now primarily used in Volunteer Gliding Squadrons by the RAF to train Air Cadets through the Gliding Induction and Gliding Scholarship courses. The Grob 109B is known by the RAF as the 'Vigilant'.
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