pneumatic catapults

[Knufire]

Originally Posted by ollien

Maybe I'm misinterpreting the rule and the conclusions you're drawing from it, but no inspector has ever faulted us for having one solenoid for two pistons.

One solenoid for two cylinders is legal. Two solenoids for one cylinder is not legal.

Originally Posted by ollien

Why would filling two pistons from one solenoid, vs 2 pistons from 2 solenoids, be faster?

There used to be a rule that limited the Cv (flow coefficient) of solenoid valves on the robot, causing the solenoid to be a bottleneck in the flow path. That rule has since been removed. However, larger Cv solenoid valves are generally larger and/or heavier, so multiple cylinders on multiple solenoids may be a good alternative depending on your design constraints.