Fig. 231.—The Curtiss OXX-5 Aviation Engine is an Eight-Cylinder Type Largely Used on Training Machines.
The Curtiss Company have developed in the last two years a larger-sized motor now known as the V-2, which was originally rated at 160 horse-power and which has since been refined and improved so that the motor gives 220 horse-power at 1,400 turns, with a fuel consumption of 52⁄100 of a pound per brake horse-power hour and an oil consumption of .02 of a pound per brake horse-power hour. This larger motor has a weight of 3.45 pounds per horse-power and is now said to be giving very satisfactory service. The V-2 motor has drawn steel cylinders, with a bore of 5 inches and a stroke of 7 inches, with a steel water jacket top and a monel metal cylindrical jacket, both of which are brazed on to the cylinder barrel itself. Both these motors use side by side connecting rods and fully forced lubrication. The cam-shafts act as a gallery from which the oil is distributed to the cam-shaft bearings, the main crank-shaft bearings, and the gearing. Here again we find extremely short rods, which, as before mentioned, enables the height and the consequent weight of construction to be very much reduced. For ordinary flying at altitudes of 5,000 to 6,000 feet, the motors are sent out with an aluminum liner, bolted between the cylinder and the crank-case in order to give a compression ratio which does not result in pre-ignition at a low altitude. For high flying, however, these aluminum liners are taken out and the compression volume is decreased to about 18.6 per cent. of the total volume.
Fig. 232.—Top and Bottom Views of the Curtiss OXX-5 100 Horse-Power Aviation Engine.
The Curtiss Aeroplane Company announces that it has recently built, and is offering, a twelve-cylinder 5′′ × 7′′ motor, which was designed for aeronautical uses primarily. This engine is rated at 250 horse-power, but it is claimed to develop 300 at 1,400 R. P. M. Weights—Motor, 1,125 pounds; radiator, 120 pounds; cooling water, 100 pounds; propeller, 95 pounds.
Gasoline Consumption per Horse-power Hour, 6⁄10 pounds.
Oil Consumption per Hour at Maximum Speed—2 pints.
Installation Dimensions—Overall length, 845⁄8 inches; overall width, 341⁄8 inches; overall depth, 40 inches; width at bed, 301⁄2 inches; height from bed, 211⁄8 inches; depth from bed, 181⁄2 inches.