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A black hole can theoretically be made from pure energy. These are called "kugelblitz"

the Nakajima Ki-87 was a japanese world war 2 prototype aircraft. It was powered by an 18 cylinder radial engine with a turbo-supercharger that put out about 2,400 hp. it also happens to be my favorite prop in warthunder.

As far back as 1937 Japanese engineers were working on a ramjet and rocket powered interceptor prototype known as the "Kayaba Katsuodori". The project never produced a working protoype, however the design specifications claimed the ramjet would produce around 1,700 lbs of thrust. It was proposed that this interceptor would be armed with 2 x 30mm Ho-301 cannons in order to combat the American B-29s over Japan, but as mentioned before, the design never got into the prototype stage, as it was cance…

The last battle fought on American soil was the Aleutian Islands campaign in WWII (the islands that come off Alaska and towards Russia). This is the only case in which a foreign power was successful in conquering land considered to be part of the American homeland. On June 3-4, 1942 the Japanese conducted airstrikes against the two US military bases on Dutch Harbor. On June 6th the Japanese made landfall on Kiska island, then Attu island on the 7th. The defenders were heavily outnumbered and qui…

the PZL M-15 is the world's only jet-biplane.

the BMW H2R uses a hydrogen internal combustion engine.