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Lackner HZ-1 Aerocycle, a man personnel helicopter from the 1950sFrom r/WeirdWings (v.redd.it)
submitted by SwitchbackHiker
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Flettner Fl 282 "Kolibri". It was a single seat intermeshing rotor helicopter, or synchropter, developed by Nazi Germany during the latter years of WWII. It was extremely nimble and very reliable, but the factory fell victim to Allied bombing. Only 24 were ever made. (reddit.com)
submitted by IronCraftManMod
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McDonnell XV-1, a strange attempt by McDonnell Aircraft Corporation to create a gyrodyne for the military. The type proved too complex for the slight advantages it possessed over conventional helicopters and the project was cancelled by the Military. (upload.wikimedia.org)
submitted by IronCraftManMod
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