Who can build the cleanest snowmobile?
Nearly 20 teams are competing in this year’s Clean Snowmobile Challenge, put on by the Society of Automotive Engineers.
The event is held at Michigan Tech’s Keweenaw Research Center in Calumet.
The goal is to engineer a cleaner, quieter snowmobile.
The SAE Clean Snowmobile Challenge continues all week, including a 100–mile run to Copper Harbor and back today and a showcase at the Copper Country Mall tomorrow.