This is a .46 size airplane engine by Thunder Tiger. It is made in Taiwan and comes with a 3-Year Limited Warranty. FEATURES: Dual ball bearing-supported crankshaft Schnuerle porting ABN (Aluminum Brass Nickel) piston/cylinder assembly Forged aluminum connecting rod with dual bushings Unique "squared" cylinder head design has more surface area than most conventional cylinder heads, for cooler runs Twin-needle carburetor INCLUDES: Engine, Expansion-Style Muffler (with pressure fitting & rotatable outlet), glow plug, wrenches, decals, and instructions. REQUIRES: Prop, engine mount, fuel filter, and fuel (Thunder Tiger recommends fuel with castor oil). SPECS: Displacement: .455 cu in (7.46cc) Bore: .853" (21.8mm) Stroke: .7874" (20mm) Power Output: 1.43 HP @ 16,000 RPM Maximum RPM range: 2,000 - 17,000 RPM Practical RPM range: 2,500 - 14,000 RPM Weight (w/muffler): 17.01oz (482g) Crankshaft thread size: 1/4-28 Crankcase width (for engine mount): 1.36" Exhaust mounting width (center to center): 37mm Overall height: 3.4" (87mm) Overall width (w/mount flanges): 1.97" (50mm) Overall length (backplate to front of drive washer): 3.39" (86mm) Recommended prop size: Break-In: 11x5 Sport and Scale: 10.5x6, 11x6 Aerobatic: 10x6.5, 10.5x6, 11x5 8/28/95eke ir/jl updt jxs 12/12/03 updt JBM 11/04/05