Thanks for your reply. I have looked at the tables, I figured id be best off using a thermal receiver + thermal rocket nozzle with LFO or a plasma engine running on Xenon. At the moment I am thinking I'd be best off doing this setup: - Low Kerbol solar arrays + Jool antimatter power stations to generate power - Relay the power to kerbin orbit - Beam power down to 2 science labs to produce antimatter over 2.5 km away from launchpad - Rover it over to my launch vehicle. - Make my Launch vehicle have a antimatter reactor + Generator + Xenon + Plasma Engine + Extra beamed power receiver (can never have enough mj's) to get into orbit. - Profit (Antimatter can be transferred with KAS, 100% sure?) Just seems like a whole lot of steps to get something into orbit. Somehow I feel like there is a better way to utilize antimatter to get into orbit than this evil scheme.