Aw hell, I just re-read the manual after seeing a couple of successful pneumatic catapult. I thought the solenoid valve restriction was 1/8"
orifice diameter (another way to limit CV). Turns out it's 1/8" NPT
Port Diameter. You can get solenoid valves with 1/8 npt ports and CV's above 1.0 each - more than enough!
/that moment when you realize you've made a wrong assumption, and its too late to change course
