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THE ROLLS-ROYCE COMPANY. The Rolls-Royce company has practically perfected their "condor" 650 horsepower, 12-cylinder,water-cooled, "vee" engine, for service use. This engine weighs approximately two pounds per horsepower, dry, and its characteristics are as follows: ROLLS-ROYCE "CONDOR" AERO ENGINE. SERIES 1A. GENERAL. The Rolls-Royce "Condor" aero engine is of the 12-cylinder, water-cooled, "vee" type, fitted with the epicyclic reduction gear, magneto ignition, and complete with propeller hub and engine supporting brackets suitable for tubular bearers. The characteristics of the engine are as follows: Number of cylinders--- 12 Bore ----------------- 5 1/2 in. Stroke---------------- 7 1/2 in. Normal B.H.P---------- 650 Normal speed (crankshaft) 1,900 r.p.m. Maximum speed (crankshaft) 2,000 r.p.m. Normal speed (propeller) with .5537 reduction gear ----------------- 1,055 r.p.m. Fuel consumption at normal power and speed ---------------- 45 gal/hr. (749)