Well maybe you can tell me what i need to tweak. I tried simply removing the non-ElectricCharge propellant but then it just. so, this was my final attempt of my tweaks. Maybe you can tell me what i missed? The only thing it tells me is that its electric charge deprived. But its hooked up to a battery. mass = 0.25 dragModelType = default maximum_drag = 0.2 minimum_drag = 0.2 angularDrag = 2 crashTolerance = 7 maxTemp = 3600 MODULE { name = ModuleEngines thrustVectorTransformName = thrustTransform exhaustDamage = False minThrust = 0 maxThrust = 50 heatProduction = 0 PROPELLANT { name = ElectricCharge ratio = 12.0 } (removed one propellant here). atmosphereCurve { key = 0 4200 } } MODULE { name = FXModuleAnimateThrottle animationName = colorAnimation dependOnEngineState = True responseSpeed = 0.5 } } Thanks in advance