So... what do you think of the RAPIER engines? in KSP Discussion Posted December 21, 2013 I am not a new player. I started in .17. I have tried dozens and dozens of times to build a functioning SSTO before .23 and had a single success (with a single-Kerbal SSTO with no docking port and barely enough fuel to deorbit). I can now build functional SSTOs and SSTO spaceplanes thanks to the RAPIER and I couldn't be happier. I think that the lack of an electrical generator and their propensity to overheat/explode more than a Mainsail makes up for their ease of use. Hooray! Thanks, SQUAD!