Cooling of Air-Cooled Engines by Forced Circulation of Air Page: 3 of 6
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N.A.C.A. Technical M emorandur.m No. 385 2
exhaust for producing a suction about the cylinders of air-cooled
Engines will, when perfected, render it possible to house radial
Sair-cooled engines almost completely.
Piero M:agni, whose various tests have been recently de-
scribed in "Les Ailes," succeeded in the practical operation
of a 50 HP. engine, completely enclosed in a fuselage (Figs. 1,
2, and 3). He called his invention an aerodynamicc fuselage,"
because it presents no obstacle to the air current.
In order to obtain this result, an air current is forced
into the nose of the fuselage by the action of several fans re-
volving with the propeller. The air is then guided by special
deflectors which cause it to flow along the exhaust pipes and
cylinders and then, after having been utilized, pass out through
annular ports. This system of cooling worked perfectly at all
. The engine frame is mounted on two vertical axes and can
pivot so as to enable easy access to the rear side of the engine.
The propeller was difficult to proportion, by reason of
the considerable part of the disk area covered by the spinner.
Thus the Piero Magni propeller 5 has very tapering blades with a
diamotcr of 2 meters (6.56 feet) and a pitch of 1.884 motors
S(6.18 feet). It holds the engine to 1525 R.P.., corresponding
to 50 BP.
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Cooling of Air-Cooled Engines by Forced Circulation of Air, report, October 1926; (digital.library.unt.edu/ark:/67531/metadc65108/m1/3/: accessed February 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.