@Matt Stryker posted this in a different thread - I'm replying to it here: Are you running this on KSP 1.8?  If so, then kOS is almost completely broken on KSP 1.8 and that's the problem you're having.  All of kOS's bound variables are missing in KSP 1.8 - verticalspeed, core, ship, velocity, apoapsis, etc.  I know why and fixed it in the develop branch but there's other problems with the KSP 1.8 update I need to fix first before I release a kOS that's compatible with KSP 1.8. (Witho
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