Going from this compressor from CSSOH (the guru of pneumatics)-- (URL) was using an RC motor to power 1 mini-pump. I used it (slightly modified) for running my new 'steam' engine, 'Big Blue'-- (URL) issue is, as pointed out by CSSOH, the cylinder (...) (18 years ago, 8-Nov-06, to lugnet.org.ca.rtltoronto, lugnet.technic)