This is the Fox .35 cu in (5.7cc) Control Line Ceramic Cylinder Engine. FEATURES: Ceramic plated aluminum cylinder adds up to 20% more RPM, substantially reduces wear on piston and sleeve and reduces cylinder weight by 35% Suited for control line stunt models up to 44 oz (1247g) in weight and wing spans from 36" - 52" (914mm - 1321mm) and also profile models such as the Ringmaster and Flight-Streak type Single needle control line carburetor INCLUDES: Fox .35 cu in (5.7cc) Control Line Ceramic Cylinder Engine with glow plug, muffler with pressure tap REQUIRES: Fuel: Control line formula, 29% castor oil, 5% nitromethane and 66% methanol (manufacturer recommends Fox Superfuel, not carried-engine will not run properly and usable life may be reduced by using most commercial R/C fuels on the market) Glow starter, plug wrench and field equipment SPECS: Displacement: .35 cu in (5.7cc) Bore: .800 Stroke: .700 RPM: 9600 with 10x6 propeller Weight: 7.9oz (225g) with muffler Needle Setting: 5-7 turns out with hole in spraybar pointing down Distance Between Mounting Hole Centers Same Side: 0.63" (16mm) Distance Between Mounting Holes Centers Opposite Side: 1.5" (37.5mm) Height Bottom of Mounting Tab/top of Cylinder Head: 2.4" (62mm) Height from Crankcase Bottom to top of Cylinder Head: 3" (76.5mm) Width at Mounting Tabs: 1.8" (46mm) Distance from Backplate to Front Bearing: 2" (51mm) Distance from Backplate to end of Crankshaft: 3.1" (79mm) Distance Between Muffler Mounting Holes: 1.4" (35mm) jxs 7/11/08 ir/jxs