Sorry to reply again but I've been trying to get this to work and I have not been able to see any drop down arrow or a B anywhere on my screen. I would like to get this to work because I'm planning on making a craft that uses ion engines but I don't want to sit through a 30 min burn (that's with the fastest stock physics). I put this mod's file in the GameData folder like I do with all my other mods, they all work but this one isn't showing up. Does it not work for the newest version of KSP?