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When Will I Get My Unipod Gyro Balanced Personal Vehicle

Syd Mead supplied his (as always) excellent concept art for the idea of a Unipod Gyroscopically Balanced Personal Vehicle:

As Technovelgy readers know, I'm very attached to Robert Heinlein's tumblebug from his 1940 novelette The Roads Must Roll:

(Heinlein tumblebug from Astounding SF June 1940)

Even earlier, there is this idea, although it uses two wheels: the gyrocar from a 1911 story Two Boys in a Gyrocar the story of a New York to Paris motor race:

See if you can find a prototype Unipod Gyroscopically Balanced Personal Vehicle in these links:

  - EMBRIO Embodies The Tumblebug
  - Eunicycle Single-Wheel Gyro-Stabilized Scooter
  - Segway Robotic Mobility Platform Looks Like A Tumblebug
  - Tango Motorcycle Monocycle Like Heinlein's Tumblebug
  - Self-Balancing Unicycle - Heinlein's Tumblebug
  - eniCycle Self-Balancing Tumblebug
  - Honda U3-X Self-Balancing Unicycle Video
  - Self-Balancing Unicycle Mythbuster Video
  - SBU Self Balancing Unicycle Perfected In V2.0
  - Solowheel Self-Balancing Unicycle
  - Self-Balancing Electric Unicycle By MIT Student
  - Honda's Tumblebug - The UNI-CUB beta
  - RYNO To Heinlein - Your Tumblebug Is Ready!
  - Pinwheel Battery-Powered Unicycle Is Segway In Your Price Range
  - Ninebot One Self-Balancing Wheel
  - Solowheel Xtreme Heinlein Tumblebug Video
  - Hi-Yo Modobag! Away!
  - InMotion Glide 3 Electric Unicycle For The Last Mile
  - Electric Unicycle Is A Tumblebug
  - InMotion V11 Electric Unicycle Gets Air (Video)
  - Electric Monocyle Tumblebug Available On Alibaba

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