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7-Cylinder Radial Custom Collector Ring $325.00 R780 Glow Driver: $149.95 Capacity: 7.8 cu. in. (128cc) Bore: 1.125 Stroke: 1.125 Stroke/bore ratio 1:1 Induction System: Single updraft carburetor Lubrication: Oil Scavenging Gear Drive Pump Carburetor Venturi Dia.: 0.370” Output Shaft Dia. & Thread: 7/16 in.; 3/8-24 (six 10-32 prop bolts) Mounting: 4130 Steel tube mount with rubber isolation Engine Dia.: 9-3/16 in. Engine Length: 7-3/8 in. Weight: 7-1/3 lb. Misc: Roller lifters, Intake Impeller, Hemi Heads, Bronze Valve guides, Chrome Plate Cylinders, 2-Ring Pistons, Oil Max. Horsepower 10hp Max. RPM: 6,000 Idle RPM: 1,600 to 1,800 Props: 24-8 to 32-10 Glow Plugs: O.S. Type F or Hangar 9 Four Cycle Ignition: McDaniels 7-cylinder Glow Driver System Fuel: FAI or 5 to 10 percent nitro 4 stroke synthetic blend Propeller Results from Owners Manual: Zinger 24-12 5,500 RPM Zinger 24-14 5,250 RPM Zinger 24-16 5,100 RPM Zinger 26-10 5,200 RPM Zinger 26-12 5,050 RPM Zinger 32-10 ?,??? RPM