A pre-assembled larger bore live steam engine featuring a vertical single acting, oscillating single cylinder engine and pre-soldered vertical boiler with pressure relief valve. Designed for use with Sterno fuel. Boiler - Length: 5 inches, Width: 3 inches, Height: 7-1/2 inches; Mainframe - Bore: 3/8 inch, Stroke: 1/2 inch. Powers other models with hull lengths less than 30 inches. Midwest no. 987.