Keweenaw Research Institute/Michigan Technological University STUDENT GENERATION In-service emissions is one of the CSC scoring events. resonators were mounted on the intake and two were mounted on the exhaust. We added a secondary muffler to further silence the exhaust. We also implemented cold-start and idle improvements. What part or system of the sled is the team most proud of in terms of showcasing its engineering skills, and were the CSC judges impressed? The team was most proud of the sled's sound performance and their custom drive cogs. The team has attempted to manufacture its own drive cog design for a few years, and this was the first time a set made it to competition. The design made the drive cog larger and they had holes in the sides of them, allowing the sound waves to pass through them instead of reverberating off them. What was the biggest engineering challenge the team faced at any point during the 2019-2020 season, and how did it overcome that challenge? The biggest engineering challenge was designing and building a cohesive snowmobile that met all the competition goals. There are tradeoffs in any design, but especially when trying to make a clean and quiet snowmobile that retains its performance and is enjoyable to ride. This win would not have been possible without the dedication of our team leads: Noah Squires (Spark Ignition Team Lead), Tyler Kulich (Compression Ignition Team Lead), and Tristin Franckowiak (Chassis Team Lead). n MOMENTUM The team machined these custom drive cogs. November 2020 11