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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.
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