Our big off-season project this year is a game designed to encourage development of sensors, active pickups, and autonomous code. The rules are being posted on
this thread. This project is being done one essentially alternate Saturdays through about November.
On Monday evenings, we're doing "small projects", one of which includes creating a pneumatic system using the 2015 control system. Our 2015 robot was so simple (literally four CIMs on separate gearboxes) that we did not use any pneumatics; it was our first all-electric year. Other small projects include an "infinite possibilities" pit display (an infinity-shaped roller chain executed in PVC, driven by window motors), some experimentation into how the coefficient of friction of rubber on carpet depends on the normal force, and some upgrades to our air-powered t-shirt launcher.
We're also planning some business side projects; my understanding is that they will get their own time slot (possibly Thursday evenings).