Here is config file, I forgot to include it in the original post. Mostly it's copied from stock parts and tweaked. But I don't think there is error in the FX. Maybe it could be bug initiated by too many functions in one part? PART{ name = K302 module = Part author = Zbeny mesh = X302.mu //scale = 0.5 rescaleFactor = 1 TechRequired = engineering101 category = Pods subcategory = 0 entryCost = 63500 cost = 30000 title = K-302 manufacturer = Kerbal Nerd Association description = Super cool spacecraft based on vehicles from Star Gate, Star Wars and of course super cars from 80's. CoLoffset = 0.0, 1, 0.0 node_stack_bottom01 = 0.510, -2.421692, 0.0, 0.0, -1.0, 0.0 node_stack_bottom02 = -0.510, -2.421692, 0.0, 0.0, -1.0, 0.0 attachRules = 1,1,1,1,0 mass = 2 dragModelType = none maximum_drag = 0.1 minimum_drag = 0.1 angularDrag = 2 crashTolerance = 45 maxTemp = 2000 // = 3400 vesselType = Ship CrewCapacity = 2 fuelCrossFeed = True bulkheadProfiles = srf INTERNAL { name = X302Internal } RESOURCE { name = IntakeAir amount = 1.5 maxAmount = 1.5 } RESOURCE { name = ElectricCharge amount = 250 maxAmount = 250 } RESOURCE { name = XenonGas amount = 2100 maxAmount = 2100 } RESOURCE { name = MonoPropellant amount = 50 maxAmount = 50 } RESOURCE { name = LiquidFuel amount = 50 maxAmount = 50 } MODULE { name = ModuleRCS thrusterTransformName = RCS //This is the name of the transform. thrusterPower = 1 //self explanatory, this is your thrust produced resourceName = MonoPropellant resourceFlowMode = STAGE_PRIORITY_FLOW atmosphereCurve { key = 0 260 key = 1 100 } } MODULE { name = ModuleCommand minimumCrew = 1 } MODULE { name = ModuleGenerator isAlwaysActive = true OUTPUT_RESOURCE { name = ElectricCharge rate = 25 } } MODULE { name = ModuleResourceIntake resourceName = IntakeAir checkForOxygen = true area = 0.012 intakeSpeed = 10 intakeTransformName = Intake } MODULE { name = ModuleLiftingSurface useInternalDragModel = True deflectionLiftCoeff = 0.12 //0.42m^2 } MODULE { name = ModuleReactionWheel PitchTorque = 20 YawTorque = 20 RollTorque = 20 RESOURCE { name = ElectricCharge rate = 0.5 } } // JET ENGINE // MODULE { name = ModuleEnginesFX engineID = Cruise thrustVectorTransformName = thrustTransform exhaustDamage = True ignitionThreshold = 0.1 minThrust = 0 maxThrust = 70 heatProduction = 40 useEngineResponseTime = True engineAccelerationSpeed = 0.12 engineDecelerationSpeed = 0.5 fxOffset = 0, 0, 0.75 flameoutEffectName = flameout powerEffectName = running_thrust engageEffectName = engage disengageEffectName = disengage spoolEffectName = running_turbine engineSpoolIdle = 0.05 engineSpoolTime = 2.0 EngineType = Turbine PROPELLANT { name = LiquidFuel resourceFlowMode = STAGE_PRIORITY_FLOW ratio = 1 DrawGauge = True } PROPELLANT { name = IntakeAir ignoreForIsp = True ratio = 23 } atmosphereCurve { key = 0 19200 0 0 } // Jet params atmChangeFlow = True useVelCurve = True useAtmCurve = True machLimit = 0.75 machHeatMult = 3.5 velCurve { key = 0 1 0 -0.125804 key = 0.2 0.98 0 0 key = 0.6 1 0.2399533 0.2399533 key = 1.05 1.167 0.5409369 0.5409369 key = 1.67 1.46 0 0 key = 2.1 1 -3.49991 -3.49991 key = 2.278022 0.496117 -3.164169 -3.164169 key = 2.5 0 0.004306508 0 } atmCurve { key = 0 0 0 0 key = 0.15 0.2 2.448394 2.448394 key = 0.5 0.6 0.5020669 0.5020669 key = 1 1 1.047895 0 } } MODULE { name = ModuleTestSubject environments = 71 useStaging = True useEvent = True } MODULE { name = ModuleAnimateHeat ThermalAnim = engineEmit } MODULE { name = ModuleSurfaceFX thrustProviderModuleIndex = 0 fxMax = 0.5 maxDistance = 20 falloff = 2 thrustTransformName = thrustTransform } MODULE { name = ModuleGimbal gimbalTransformName = thrustTransform gimbalRange = 1 } EFFECTS { running_thrust { AUDIO { channel = Ship clip = sound_jet_deep volume = 0.0 0.0 volume = 0.05 0.4 volume = 1.0 1.0 pitch = 0.0 0.6 pitch = 1.0 1.0 loop = true } PREFAB_PARTICLE { prefabName = fx_smokeTrail_light transformName = thrustTransform emission = 0.0 0.0 emission = 0.05 0.0 emission = 0.075 0.25 emission = 1.0 1.25 speed = 0.0 0.25 speed = 1.0 1.0 localOffset = 0, 0, 1 localRotation = 1, 0, 0, -90 } } running_turbine { AUDIO { channel = Ship clip = sound_jet_low volume = 0.0 0.0 volume = 0.05 0.7 volume = 1.0 1.0 pitch = 0.0 0.4 pitch = 0.05 0.5 pitch = 1.0 1.0 loop = true } } engage { AUDIO { channel = Ship clip = sound_vent_medium volume = 1.0 pitch = 2.0 loop = false } } disengage { AUDIO { channel = Ship clip = sound_vent_soft volume = 1.0 pitch = 2.0 loop = false } } flameout { PREFAB_PARTICLE { prefabName = fx_exhaustSparks_flameout_2 transformName = thrustTransform oneShot = true } AUDIO { channel = Ship clip = sound_explosion_low volume = 1.0 pitch = 2.0 loop = false } } } }