4) One Wheeled Segway! - The THING V1

ORIGINAL ATTEMPT July 2010
 
There is a design study out there for a one wheeled forward facing monowheel scooter called he ORBIS. Link: Click Here
 
I wondered if it would actually be possible to ride.
 
After dismantling my original monowheel skateboard with the wide tyre, a couple of days with a welder, and some bike handlebars I rebuilt it as this. Ugly but it does work.
 
Yes it does work quite well. Riding it takes about 10 min of practice after which you get better and better. Not so sure how easy it would be without the wide tyre though.
 
 
 

YouTube Video

 
 
 
 
 
 
 
 
REBUILD Sept 2010
Works better as has lower centre of gravity than the original version shown on the left.
 
Best view! Handlebar controls: Overallgain knob, "Accelerator" gain knob (how fast it speeds up if you keep it tipped forwards at a fixed angle), battery level display. Also much stronger kill switch button - previous one would intermittently break contact giving scary ride with momentary power cut-outs.
 
 

YouTube Video

New video of rebuilt version in use September 2010 
Batteries mounted lower than in original version to lower CG and make a little easier to ride. A spot of overspray there, never mind. I could potentially add a swing-arm suspension system if I wanted to make it even heavier than it already is.
 
 
Front forks under motor allow it to rest forward on ground when not running, else it would just tip over forwards. They are alloy from a bike stand. Retractable twin wheels would be ideal solution like on the back end of one of those Dyson Ball vacuum cleaners.
 
Vertical support and handlebars can now be removed so machine will fit in boot of a car.
 
 
 
Balancing, front forks beneath motor are now in the air.
 
 
 
OSMC motor controller has plenty of air circulation after blowing up my previous one and has 2 12V fans blowing down on it for good measure. Top cover hinges open so wires can all stay connected up.
Main power switch is now a "Trip" switch which means it will turn itself off if current exceeds 75 Amps. Again this hopefully protects the OSMC which is supposedly designed to take much more than 75Amps.
 
 
 
Battery pack (2 x 12V sealed lead acids taped together) ready to go in. Removable for charging while machine can be left somewhere else overnight. Strap underneath helps with fitting and removal.
 
 
 
Battery in and connected up with chunky high current connection plugs from a robot shop. Hinged cover closed back up.
 
 
 
End view of internals. Gyro/accel/microcontroller all in lower black plastic casing. Multiplug socket is for reprogramming the microcontroller.
 
 
 
Top covers all on. Have used some spare carbon fibre panel from my twin wheeler (a bit of a joke as this machine is a pretty heavy beast).
Air from cooling fans exits through the trailing edge slot at rear of enclosure - stealth aircraft style.
Switches are for: (a) cooling fans, (b) LED headlamp and (c) buzzer circuit that warns you when almost full power is being sent to motor - and you are therefore are at risk of falling off forwards as no reserve left to go any faster.
 
 
 
Side view
 
 
 
Finally, here is my cardboard "Thing" stencil.
 
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