An illustrated celebration of the engineering around us

An illustrated celebration of the engineering around us

Why the Pull Back Car?

FEB 2026

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How Do You Play With the Car?

Before we get into the inner-workings of the pencil, we should establish the static states of the design. This will help set the stage for future analysis.

Let's Open Up the Car

It can't be that complicated, right?

Chuck

Cap

Housing

Clamp

Lead

Spring

Tube

Let's talk about the Spring

This is a rotary spring, also known as a …. or a …. It

It's this energy that propels the car forward. When you pull back, you are winding up a spring. And when you let go, you are releasing that energy, propelling the car forward. But what parts inside the car actually wind up the spring?

Okay, Time To Walk Through the Mechanism

Let's walk through the pencil mechanism, step by step, to understand how it all works

Thanks for reading! Want More?

I'm in the process of illustrating some fun exploded views and cutaways. Head over to Instagram to take a look. And sign up if you want to know about any future product breakdowns or updates.

Thanks for reading! Want More?

I'm in the process of illustrating some fun exploded views and cutaways. Head over to Instagram to take a look. And sign up if you want to know about any future product breakdowns or updates.

© 2025 Bryan Macomber Design LLC. All Rights Reserved.

© 2025 Bryan Macomber Design LLC. All Rights Reserved.

© 2025 Bryan Macomber Design LLC. All Rights Reserved.