That has to be the single most weirdest aircraft I have ever seen. Mi-32 heavy helicopter project with a carrying capacity of 60 tons.
Yakovlev VVP-6. The VVP-6 was a proposed VTOL surface-to-air missile platform during the Soviet era. This thing would be colossal. Almost the length of a Boeing 777.
The Boeing-Vertol 235 was one of the proposed designs for the Advanced Attack Helicopter project. At the end of the AAH project, the Army chose the YAH-64, now known as the AH-64 Apache.
Del Mar DH-20. A foldable mini med-evac tandem rotor helicopter.
Kamov V-100. A proposed Russian transverse rotor compound attack helicopter. If the A-10 was a helicopter, this would be it.
Ka-56 “Osa” – a portable helicopter for one person for Soviet spies that can be transported in a cylindrical container. One of the strangest demands was that it could fit into the submarine’s torpedo tube
XH-51A Compound. An XH-51 turned compound helicopter testbed by slapping a single jet engine on its left side.
Filper Research Beta 200A. XKE for scale.
Wagner Aerocar. A roadable helicopter from 1965. Meet George Jetson.
Fairey FB-1 Gyrodyne. A rotorcraft that counteracts the torque of the rotor with a single propeller on its right side.
The Fairy Gyrodyne is certainly worthy of inclusion in this list but it is nowhere near the maddest helicopter they produced.
The Fairy Rotodyne could quite rightly say, “Hold my beer.”
https://en.wikipedia.org/wiki/Fairey_Rotodyne