2025年1月18日 · The XB-15 was a massive, four-engine, mid-wing cantilever monoplane with an all-metal semi-monocoque construction. It was powered by four 1,000-horsepower Pratt & Whitney R-1830-11 engines. Boeing developed the XB-15 based on its earlier YB-9 bomber, though the XB-15’s trailing wing surfaces were covered in fabric instead of metal.

2025年1月18日 · The XB-15 was designed and built between 1934 and 1935 and became the very first four-engined American heavy bomber ever envisaged in the US. Only one prototype took its maiden flight in 1937, debuting as the largest and heaviest aircraft ever constructed in …

2023年6月18日 · A reference archive of previously suggested threads related to American Aircraft. This thread is a document for everyone to see and check before they create a double post on an already discussed idea. IMPORTANT: If you find something previously suggested/discussed that is not on this list and should be, please PM the Suggestion …