My FunWheel: A OneWheel work-alike

During COVID-19 quarantine in 2020 I decided to build myself a one-wheeled skateboard, aka self-balancing scooter, aka funwheel. The machine itself is not my ultimate goal, it is only one step towards my goal, which I will not reveal here. When I started, I had no CAD skill, and no desire to overcome what I felt was a large learning curve to get that CAD skill. Instead, I wanted to hone the ability to build a working electric powered personal transporation machine, and a funwheel seemed like a great way to do that. It was! Objective achieved! Would I do it twice like this? Overall yes, in detail probably not. If there's one thing I would do differently, it would be to have a motor mount that attaches to the frame, rather than mounting the motor right into the frame. The second is that as a follow-up to building the machine, I decided it would be a good idea to learn CAD after all, and so I retroactively modeled my build using Autodesk Fusion 360.

The result has been a very ridable, very fun machine. Here is a video of me riding it. It weighs 10.7kg/23lbs and I get about 20Wh/km, or 32Wh/mi. It isn't as capable as I want yet, but with some motor tuning and an additional voltage boost (up to 14s/50.4V) it should get there. Currently speed is not an issue, I am easily attaining 20mp/h (30km/h) on flat ground. Steep hills are a challenge when the battery is below 40% because of a low-voltage glitch that causes motor ticks; this is not a real issue for general ridability. Additional enhancements will round out the board's usability:

  1. An integrated BMS, so I can stop opening the lids every time I want to charge the batteries.
  2. Bumpers.
  3. A reliable on/off switch. Currently I'm using a power cut pull-key to disable the board reliably.
  4. Oh yeah, and footpads!

workbench view

Components

profile view

plan viwe

Components:

Rendering errata

Frame details

Motor details

From PHUB188 vendor page, with annotations.

PHUB188 power chart

Wrench holding axle

Battery details

Motor controller settings

There is a spreadsheet with various tuning options. * VESC Tool & firmware: 2.06

Fang Wheel

The fang wheel is not as depicted. Instead, I found this wheel at the local home depot, named a "Richelieu Hardware 1-9/16 in. 20 kg General-Duty Rubber Rigid Casters":

Richelieu Hardware Link

Home Depot Link

Blacks Richelieu Caster

Caliper showing 2"

Pics

rendering showing the machine on a cobblestone plaza

Actual build

CAD Files

Contact

I'm happy to talk about my project. Hit me up at benjamin.n.damm@gmail.com !

Back to Main Page