MASA Launch Systems
From LUNARwiki
MASA mixes misfire alley with racks--the racks are for people who don't have pads, and school launches, etc.
Two options for multipad controllers are listed under "plans" on this page, MASA Tech:
Steve Robb's 8-pad launch controller article (PDF v4)
I've since replaced the lenses on 6 of the 12 switches with green ones, so I have a red rack of 6 and an independent green bank of 6. (You could also just have 12 pads, but banking them allows the HPR to be isolated from the modrocs if someone leaves a pad selected; see below).
If I were doing mine over again, I'd use superbright LEDs instead of 12v lamps.
As you'll see, these are both capable of drag races. That said, the "Pad selected" lights _at the pad_ are a great way to prevent launching the wrong rocket should someone leave a pad select switch on by accident."
It's cheapest to use 100' extension cords and three prong household sockets for as many of the connections as you can--just wind them up on a hose spool. It's also pretty cheap to use car relays--12 v at 15 amps or more. I've never had one fail.
I have blown a diode on my controller, but only once.
