 A total of 151 G 109A motor gliders were produced.The G 109Ar was a modification used on 2 Grob109A by the Aero Club Valkenburg of two aircraft with a Rotax boxer-type engine for increased performance on short runways and reliability.The nose of the plane is longer than that of the regular G 109A, the engine covers are shaped differently to house the engine and its air inlets and improve airflow across the larger radiator.