Quote:
Originally Posted by jfitz0807
We used a double solenoid for shifting because we wanted to use pneumatic pressure for both shifting directions rather than relying on a spring inside the cylinder. Specifically we used very small pancake shifters. To use a dual port cylinder like this, the double solenoid is the way to go.
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I don't think that's correct. As Ari423 explained above both single solenoids and double solenoids can charge both sides of the pneumatic cylinder and neither setup requires a return spring in the cylinder. The only practical advantage of a double solenoid in FRC is that they won't return to a default state when the robot is powered off which can be useful in certain situations but certainly not shifting.