OS 46 LA-S ENGINE SILVERControl Line Stunt Version Brand New In BoxThis is the .46LA engine from O.S. Max designed for sport airplane use.This is a non-ringed engine with a Two-Year Warranty.This engine has a natural finish w/"O.S." & "46LA" on the side.FEATURES1-piece crankcase Crankshaft is set in one long bronze Oilite bushing (no bearings) Schnuerle porting (AKA Schnuerle scavenging) Side exhaust Nylon backplate with remote needle valve 40D carburetor Aluminum piston with Nickel-plated brass cylinder liner.INCLUDESOne expansion-style muffler #E-3030 One instruction manual and sticker sheet One assembled engine with glow plug Two 3x30mm phillips head screws to bolt muffler to engineSPECIFICATIONSConstruction: Aluminum 1-piece crankcase, piston, cylinder head Bore: 23.0mm (0.906") Stroke: 18.4mm (.724") Horsepower: 1.2 PS, 1.18 HP at 15,000 RPM Distance from remote needle to end of crankshaft: 4.5" (114mm) Distance from center of engine to drive hub: 2.0" (51.2mm) Distance from center of engine to end of crankshaft: 3.0" (76.3mm) Height from crankcase bottom to top of cylinder head: 3.3" (84.7mm) Height/crankshaft center to top of cylinder head: 2.7" (69mm) Width including mounting ears: 1.9" (48mm) Width not including mounting ears: 1.2" (32mm) Width between mounting holes same side: 0.69" (17.5mm) Width between mounting holes opposite side: 1.6" (40.5mm) Width between muffler mounting holes: 1.4" (36mm) Width of exhaust opening: 1.1" (29mm) Height of exhaust opening: 0.3" (7mm) Diameter of muffler body: 1.3" (33.5mm) Angle of muffler in relation to engine: 4° Weight: 272g (9.6oz without muffler) Crankshaft Thread Size: 1/4-28 Recommended Props: Break In: 11x6 Trainer and Sport Models: 11x6, 11x7 Scale Models: 12x5, 12x6 Practical RPM Range: 2,000 - 16,000 RPM (This engine will not turn this many RPM on the ground) RPM curve is when the engine unloads.