Test of supercharger air coolers (power plant section report)
DescriptionThe object of this test is to compare relative cooling effect of the three types of air coolers which have been tested with the Form "D" supercharger. The small honeycomb air cooler offers no advantage over the General Electric tubular type and has a somewhat greater pressure drop. The large honeycomb air cooler increases the cooling approximately 40 per cent with a proportional increase in area. While this air cooler is somewhat larger than necessary for flights up to 20,000 feet, it is recommended for use for all high altitude work or in special cases where increased cooling is necessary.
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Report on cooling system tests of DH-4 airplane equipped with experimental auxiliary radiator in the propeller slipstream United States. Army. Air Service. Engineering Division.