Project RazEr

As a followup to Snuffles The First, I have actually decided to down-engineer something (can you believe it?) while adding tweaks and more advanced technologies. This rebuild is intended as a testing bed for small-EV technologies as well as my way of getting around town faster.

The design has exactly two moving parts – the front wheel and the rear wheel. Propulsion is provided by a custom-built in-wheel electric motor (a hub motor) that is mounted inside the rear wheel. No mechanical parts protrude or rotate externally, and the standard fender friction brake still works.

Batteries are housed in an aluminum frame extension under the scooter body. The entire scooter weighs under 14 pounds and can propel a 150 pound person at speeds up to 12 miles per hour on level ground.

The epic saga of the RazEr, including a full engineering history, can be found in its build report category.

If you are interested in building your own hub motors, I have prepared an Instructables page detailing some of the underlying principles behind RazEr’s motor.

Vehicle Razor A3-125
Drivetrain Direct drive in-wheel
125mm polyurethane wheels
Mechanical 6061 Aluminum structure
Steel forks and folding joint
Cushy handlebars
Motor Custom BLDC
Controller 100 amp HV Brushless airplane ESC
5K potentiometer-to-RC interface
Battery 5.0Ah 29.6 volt lithium polymer battery
Top Speed 12MPH
Range 4 to 5 miles
Curb Weight 13.5 pounds

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Prove you are human by reading this resistor:
0Ω+/- 5%

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Match the sliders on the left to each color band on the resistor.

Click Here for a new resistor image.

If you'd like to learn more, read about resistor color codes here.