What scale are you looking to model . A gear pump would be much easier to build . Also what pressure are you thinking of useing .what volume do you need . Also what are you planing on useing to power it . Dale
I got interested in machining in order to help my RC hobby and in fact I enjoy the trucks and construction equipment most. I hope it's not against the rules or frowned upon but here is a link to a popular forum where there is someone planning to scratch build some scale hydraulic parts. People there have build some really amazing stuff (just like the folks here) Here's the link: http://www.rctruckandconstruction.com/showthread.php?t=3631