Curtiss Model 53 Condor

[1][2] Its two 635 hp (474 kW) Curtiss Conqueror pressurized water-cooled V-12 engines were mounted on top of the lower wing in long cowlings.

Their nacelles were long, extending beyond the trailing edges, containing the fuel tanks behind the engines and, unusually, baggage holds at their rears.

[1] The lower tailplane of the Condor's biplane tail unit was mounted on top of the fuselage with the upper one held above it by the twin fins and central struts.

The Conqueror's development was never quite completed and in 1932 the US Army, after spending large sums on it, withdrew support and turned to air-cooled engines.

[3] Data from Jane's All the World's Aircraft 1931,[4] Aero Digest : Curtiss Condor[1]General characteristics Performance