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The Grob 109B motor glider, known by the RAF as the Vigilant T1, is used by the Air Cadet Organisation to give basic flying and gliding training to air cadets and is used by 16 Volunteer Gliding Squadrons (VGSs), at various sites around the UK.

The aircraft is powered by a four-cylinder engine and a  variable-pitch, two-bladed propeller. The fixed landing gear features two main wheels and a tail wheel, which is steered through the rudder pedals. A hand throttle is provided for use by the left-hand seat, giving the student the familiar military configuration of right-hand stick and left-hand throttle arrangement.

The Vigilant T1's docile handling characteristics make it an excellent choice for training cadets and instructors alike.