3 Scale Model Case


| September/October 1972


909 Naperville Road Wheaton, Illinois 60187.

A 3' Scale Model Case Engine built and owned by Gerald Carruthers, Lenox, Iowa, in 1965, and exhibited by him at the Mt. Pleasant reunion in 1967. Boiler description; locomotive, dry firebox bottom type, all welded construction, boiler shell 8'Dia., 29' long plus smokebox and firebox, six 11/4' tubes 25' long, firebox 61/2' wide, 10-3/8' long, 61/2' grate to crownsheet. The boiler has 6.33 Sq. Ft., of heating surface, 0.47 Sq. Ft., of grate surface, 0.25 Cu. Ft., of firebox volume. The boiler when burning 20 lbs., of 8,500 Btu., wood per hour, operating at 68% efficiency and 100 lbs., steam pressure and 60°F., feed water temperature will produce 62 lbs. of steam per hour.

A 3' Scale Model Case Engine owned by Gerald Carruthers, Lenox, Iowa. Built in 1967.

The engine is a single cylinder simple, 2 1/2' bore, 2 3/4' stroke with 'D' slide valve and Woolf valve gear with steam cutoff set at 9/10 stroke, with governor control speed set at 275 RPM. The indicated H. P. developed at 81 lbs., mean effective pressure is 1.5. The brake H. P. at 74% mechanical engine efficiency woulddfcf

The engine traction system is a two shoe band or flywheel clutch, a 2.2' 10 pitch crankshaft pinion, a 6.4' 10 pitch intermediate gear, a differential spur gear l0'-10 pitch, 2.25'-8 pitch countershaft pinions, 11.25'8 pitch bull gears, and 18' Dia., drive wheels with 5 1/2' rims. The gear hubs turning on shafts are bronze-bushed. The engine will travel at 0.65 MPH., with 275 RPM., engine speed and deliver 0.70 H. P., to the drive wheel rims equal to 403.8 lbs., gross tractive effort. The engine weighs, with fuel and water supply 750 lbs., and on traction on smooth dry clay road the tractive effort to move the engine is about 56 lbs., which will leave about 348 lbs., drawbar pull equal to 0.60 net drawbar horsepower. This is a neat working model very typical of its Case big brothers except the firebox volume is small and the piston speed of the engine is very low, 63 rpm, and the 9/10 cutoff point is later than those. Engine construction features through the courtesy of Mr. Carruthers. Engine performance calculations and submission by Ernest H. Casson.






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