Yokosuka Tenga
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The Yokosuka Tenga (天河, "Milky Way") was a proposal to provide the Imperial Japanese Navy with a jet-powered bomber towards the end of World War II. The concept was to replace the piston engines of the Yokosuka P1Y1 with turbojets.
The powerplant selected was the Ishikawajima Ne-30, then under development. However, before a single example could be built, both the Ne-30 project and the Tenga were cancelled due to technical difficulties with the turbojet design.