This was William “Scotty” Hewitt’s first CO2 powered race car, #7, which won first place in the 1996 Sherline Machinist’s Challenge at the North American Model Engineering Society Expo. A small cylinder is charged with CO2 to power the geared rear end. Scotty carved both the body and driver by hand, too.
![Scotty Hewitt’s miniature red #7 vintage race car, which is powered by CO2.](https://craftsmanshipmuseum.com/wp-content/uploads/2023/06/Hewitt3b-125x125.jpg)