[1.7 Maneuvering Engine Balance Changes]

I have used the Spark for just about anything vacuum for its TWR and ISP.  While this might need me to redesign and look to other engines, but the actual mass change is not that big. If you shoot for an acceleration of about 0.5 g, the Spark can move some 4 t. A change of 0.03 t is about one percent less acceleration, I can live with that.

[Kerbal Space Program update 1.1 “Turbo Charged” is now available!]

This must have happened minutes after I shut down last night. Better scramble to save my directories until vital mods update.