Standard engine to motorize a large number of \"indoor\" or parkflyer models. The long output axis allows you to easily install a propeller or a reducer. Food: 4.8 to 8.4V. Rotation: 21000. Consumption at: 2A. Diameter: 35.8mm. Length: 50mm. Weight: 179g. Axis: Dia.3.17 x 9mm.