Third Wheel

A simple two-motor NXT car needs a non-powered slider, wheel, or wheels of some type. A single wheel is often a good choice, since it is simple to build and makes turning the car easier than a pair of non-powered wheels.

In fact, the “wheel” does not need to be a wheel at all; a slider can be a good substitute.

Four possible third wheels/sliders are shown below: a fixed wheel, a tow-ball slider, a knob-wheel slider, and a castor wheel.

NXT front wheels


The following two tabs change content below.
Barbara Bratzel

Barbara Bratzel

Barbara teaches at the Shady Hill School in Cambridge, Massachusetts and works at the Center for Engineering and Education Outreach at Tufts University. She is the author of several LEGO robotics activity books for teachers, most recently STEM by Design.
Barbara Bratzel

Latest posts by Barbara Bratzel (see all)