Rakaydos

Specifically, I'm trying to build a horizontal mass driver for Minmus- hook up a kethane-filled fuel can, start it spinning, extend the winch(s), release the winch at maximum speed, and RCS the fuel can into a stable orbit. Or launch anything else, within the mass limits of the launcher.

I have an ambitious plan for a minmus mass driver, that requires a rotating bearing part. Scott Manley used a module that would meet my needs during his Reusable Space Program youtube series, but I do not believe he actually identified the part or the mod it is from. ( )I'm looking for a part that can freely rotate on one access, and attach additional parts to that rotating section. I would be interested in comparing different types of bearings, if more than one is available.