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Curtiss built the 6-cylinder inline water-cooled R6 in 1921 to facilitate U.S. Navy experimentation with the Ricardo supercharging system, in which air on the underside of the piston was compressed on the intake stroke and fed back to the cylinder through an intercooler during the compression stroke. Increased weight and complexity offset any power gains and the experiment was deemed a failure. The R-6, which displaced 1,847 in³ (30.3l), produced 400 hp at 1,450 rpm and weighed 1,200 lb (544 kg).
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