Saito FA-40a Engine SAT40ASaito FA 40a Engine Give 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. 10 X 4 prop at 10,500 rpm Smaller case design for lighter weight Nearly the same case size as a . 30, but packs more power Specifications: Displacement: 6. 6cc Bore: 22mm Stroke: 17. 4mm