The 1933 Contest for the Deutsch De La Meurthe Trophy Page: 32 of 60
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N. A..A. Technical Memorandum No,'724
"Specific fuel consumption 230 g/hp/h .507 lb.,/hp,./hr.
Specific oil consumption 9 .02
Reduction-gear 'ratio -2.25
Pressure produced by Farman
centrifugal supercharger 1,120 mm 44.1 in.
(at sea level)
Total weight of engine and
.accessories 230 kg 507.06 lb. /,Z/
The Delage 12 C.E.D.1.R.S. Engine
This engine, rated at 370 hp., has already developed
420 hp. in the tests and may be expected to attain 450 hp.
(fig. 55). During the flights of the "Kellner-Bechereau"
airplane, the propeller was poorly adapted, revolving at
3,100 r.p.m0 on the ground and 4,800 in flight; that is
to say, too fast.
The accident to the airplane was due to the rupture
of a rubber ring between the engine and the radiator.
The steam blinded the pilot, who made a completely blind-
This inverted engine has 12 cylinders in two banks
at an angle of 600 . The valves are operated by rockers
and rods. The recall of the valves is effected by springs
situated not on the valve but on the end of a reduction
lever, thus, reducing the amplitude of the natural oscil-
lations of the springs and increasing their damping effect
a The nitrided steel cylinders are immersed in water.
The cylinders serve only to guide the pistons and do not
) work in traction. The valve seats and spark-plug sockets
a ra mi 'e .of' special bronze. The top of the crankcase
serves simply as an air-tight cover. The crankshaft is
perfectly balanced, in order to eliminate the stresses on
the bearings. The two-part connecting rods of chrome-
nickel steel are mounted on rollers directly on the crank-
shaft. The supercharger is the same typo as used on the
This supercharger consists of a case (A) of light al-
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Léglise, Pierre; Hirschauer, L. & Saladin, Raymond. The 1933 Contest for the Deutsch De La Meurthe Trophy, report, October 1933; (digital.library.unt.edu/ark:/67531/metadc63516/m1/32/: accessed January 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.