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03/31/2008. The last sesqui-winged Boeing Model 15 PW-9 was converted to an experimental fighter by fitting a new lower wing with equal span of the upper wing. The original 435 hp Curtiss D-12 was replaced by a supercharged 510 hp Packard 1A-1500. It was delivered to Wright Field for testing on July 27, 1926, and was surveyed on May 1, 1928. |
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