Alphonse C. Vassallo built this opposed model airplane engine in 1985. (Courtesy of Cherise Vassallo, Ingrid Vassallo, Andre Vassallo). This two-cylinder, four-cycle engine is completely machined from steel and aluminum bar stock, including Al’s custom-designed carburetor. It has a bore of 1 inch and a stroke of 1 inch and burns methanol on glow ignition. The enclosed rocker arms are lubricated by the fuel/air mixture; however, the gear case in back required grease packing or manual lubrication. Al flew several variations of his airplane engines in numerous scratch-built aircraft he produced. The engine is 11″-long, 10″-wide, 7.7″-high, and weighs 6.5 lbs.