 Under the current CAA LASORS document, the G109B can be classed as either a touring motor glider (TMG), or a self-launching motor glider (SLMG).The G 109B is powered by a Grob 2500 E1 horizontally opposed, four-cylinder, air-cooled petrol engine that develops approximately at 2,950 rpm.The propellor is a two-bladed, manually operated variable-pitch type driven directly from the engine.