The two mounting fasteners for the motors have through holes down the center. One has an air fitting inline. That’s the inlet. The other is a drilled socket head cap screw. That’s the outlet.
Inside the tube are chains. We developed a fixed center to center chain drive a few years ago, and worked with a sponsor to have the rails CNC machined. Unfortunately, this year our sponsor has said they would be able to continue supporting the team. Our top priority this summer is to develop a new drive train design, or find another sponsor to machine the drive rails. We’re experimenting with the versa blocks after hearing good reports back from teams we’re friendly with using them. With them, we think we can make our own drive rails in house without relying on sponsors.