Saito FA-40a Four StrokeGive your 30 size aeroplane a real boost in performance with this high power to weight ratio engine. With similar mounting dimensions to many . 30 size engines, the FA 40a should drop into place with little or no re working of the engine bay. Product Features Will swing a 10 x 4 prop at 10,500 rpm Smaller case design for lighter weight Similar case size as a . 30, but packs more power Includes muffler