Mathematical and Experimental Investigation of Heat Control and Power Increase in Air-Cooled Aircraft Engines Page: 2 of 18
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TECILNICAL MEMORANDUM NO. 540.
MATHEMATICAL AND EXPERIIBNTAL INVESTIGATION OF HEAT CONTROL
AND POWER INCREASE IN AIR-COOLED AIRCRAFT ENGINES.*
By F. Gosslau.
For more than a decade the vertical water-cooled engine
was the German standard aircraft engine. It did not seem possi-
ble for its fuel consumption, power output per unit volume,
length of life and reliability to be surpassed or even equaled
by an air-cooled engine. In the last few years, however, there
has been active competition between air-cooled and water-cooled
engines and it can now be confidently asserted that, up to 600
hp, the advantage lies with the radial air-cooled engine.**
This is indicated by the fact that nowadays hardly an engine
within this range is designed for water cooling, while a new
radial air-cooled engine appears almost every month. In Germany
and elsewhere (ell-known firms, which had formerly made vertical
water-cooled engines exclusively, have turned their attention to
the manufacture of radial air-cooled engines.
The first high-powered radial air-cooled engine was the
Bristol "Jupiter" which was designed in 1918. The latest air-
planes of the German Lufthansa are equipped with this engine,
*"Rechnerische und experimentelle Untersuchngen uber Warmebeh-
errschung und Leistungssteigegung in luftgekuhlten Flugmotoren-
zylindern" from Zeitschrift fur Flugtechnik und Motorluftschif-
fahrt, Oct. 7, 1928, pp. 461-466.
**Cf. V.D.I., 1925, p.1329; 1926, p.1672; Z.F.M., 1927, p.63.
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Gosslau, F. Mathematical and Experimental Investigation of Heat Control and Power Increase in Air-Cooled Aircraft Engines, report, November 1929; (https://digital.library.unt.edu/ark:/67531/metadc277458/m1/2/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.