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Unformatted text preview: ; barrel carries integral steel f ins, f, Wright
Turbo-Cyclone cylinder of 1948, with forged and machined aluminum head, forged-steel barrel
w ith rolled-on a luminum fins, and sodium-cooled exhaust valves, stellite-faced, has more than 100
square inches of fin area for each square inch of piston area, (a-e, from Transactions of the Society
of Automotive Engineers, v ol. 2 1 , pt. 2, p. 872, 1926; f, courtesy Wright Aeronautical Corporation.) finally a 9-cylinder 2 00-hp radial in 1921. This was the J - l (fig. 39), which
was supported by an order for 200 engines from the United States Navy. In
1922 Lawrance's company was absorbed by the Wright Aeronautical
C orporation 16 a nd, with Navy support, the 9-cylinder engine was built in
i mproved models known as the Wright J - 3 , J - 4 , and J-4b, all with essentially the Lawrance cylinder design (see fig. 36a-d).
D uring the same period, 1918-1926, S. D. Heron had left England
a nd had been employed by the United States Army Air Service at McCook
F ield, Dayton, Ohio, to assist in the development of large radial engines.17
H eron was a devoted worker and an able engineer, and by 1921 h ad developed successful air-cooled cylinders of nearly 6-in. bore, based on his work
w ith Gibson plus his own improvements worked out at McCook Field.
A gainst considerable resistance from their chief engineers, who at the
t ime were thoroughly committed to water cooling, the Curtiss Aeroplane
C ompany and Wright Aeronautical accepted contracts from the Army
A ir Corps to build prototype radial engines with Heron-designed cylinders.
S ome engines were built, but in very small numbers.
T he Lawrance and Heron developments were brought together when
H eron in 1926 j oined Wright Aeronautical Corporation, of which Lawrance
w as president. The first result, the Wright J - 5 , was essentially a Lawrancetype engine with Heron-type cylinders (figs. 36e and 40). This was a
successful engine of the 200-hp class, as evidenced by its use in Lindbergh's
N ew York-Paris flight, 2 0-21 M ay 1927, in many other pioneering flights,
a nd in a number of early transport airplanes. It won the Robert J. Collier
t rophy, this country's most sought after aviation award, in 1927. Wright
A eronautical had also been experimenting with air-cooled radial engines
43 Figure 37.—Bristol J upiter 9-cylinder engine,
1 922; 400 hp at 1650 rpm, 700 lb. This example
was built by Cosmos Engineering Co., Ltd. Cylinder design is similar to that of ABC cylinder in
figure 35, left. (Photo A-3104) Figure 38.—Armstrong-Siddeley Jaguar
14-cylinder 2-row radial engine, about
1 922; 3 60 hp at 2000 rpm, 910 lb. First
successful British radial engine with
aluminum-head cylinders and geardriven supercharger. Cylinder design is
s imilar to that of Gibson cylinder in
f igure 35, right (Photo A-3111) Figure 39.—Lawrance J - l air-cooled
radial engine, 1922. The first Americandesigned 9-cylinder radial to be put into
general use, its rating was 200 hp at
1800 rpm, 476 lb. The ca...
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This document was uploaded on 01/19/2014.
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