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I have built my own engines for KSP by the usual methods; Blender, Unity, and then modifying a .cfg file to fit my specific engine. The engines work just great in KSP 1.1.3. However, when I install them in KSP 1.2.2, they have no thrust. They use fuel, produce smoke, and make noise; they just do not have any thrust on the pad and no thrust is computed on the stats in the VAB. I am using a completely stock install of 1.2.2, except for the engines, which are in their folder under GameData. Here are two photos of the same part in action in both versions. Here is my .cfg file: PART { name = hybridFirstStage module = Part author = Peter Balholm, after Kartoffelkuchen mesh = model.mu rescaleFactor = 0.7 node_stack_top = 0.0, 33.42, 0.0, 0.0, 1.0, 0.0, 1 node_stack_bottom = 0.0, -4.4, 0.0, 0.0, -1.0, 0.0, 1 TechRequired = start entryCost = 0 cost = 2000 category = Engine subcategory = 0 title = Hybrid First Stage Engine manufacturer = Sarawak Tank Company description = A hybrid rocket engine which can be clustered to build the first stage of the Cassandra rocket. The oxidizer tank is bamboo plywood and holds nitrous oxide pressurized with gaseous oxygen. The fuel is paraffin wax and powdered aluminum. The sea-level nozzle made of Baekelite reinforced with asbestos fiber. // attachment rules: stack, srfAttach, allowStack, allowSrfAttach, allowCollision attachRules = 1,1,1,1,0 // --- standard part parameters --- mass = 3.33 dragModelType = default maximum_drag = 0.2 minimum_drag = 0.2 angularDrag = 2 crashTolerance = 7 breakingForce = 200 breakingTorque = 200 maxTemp = 3600 RESOURCE { name = LiquidFuel amount = 6012 maxAmount = 6012 } RESOURCE { name = Oxidizer amount = 24048 maxAmount = 24048 } EFFECTS { running_closed { AUDIO { channel = Ship clip = sound_rocket_hard volume = 0.0 0.0 volume = 1.0 1.0 pitch = 0.0 0.2 pitch = 1.0 1.0 loop = true } PREFAB_PARTICLE { prefabName = fx_smokeTrail_veryLarge transformName = smokePoint 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 } MODEL_MULTI_PARTICLE { modelName = Squad/FX/ksX_Exhaust 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 0.5 speed = 1.0 1.2 } } engage { AUDIO { channel = Ship clip = sound_vent_soft volume = 1.0 pitch = 2.0 loop = false } } flameout { PREFAB_PARTICLE { prefabName = fx_exhaustSparks_flameout_2 transformName = smokePoint oneShot = true } AUDIO { channel = Ship clip = sound_explosion_low volume = 1.0 pitch = 2.0 loop = false } } } MODULE { name = ModuleEnginesFX thrustVectorTransformName = thrustTransform engineID = AJ-26-62 runningEffectName = running_closed exhaustDamage = True ignitionThreshold = 0.1 minThrust = 0 maxThrust = 924 useEngineResponseTime = False engineAccelerationSpeed = 20 heatProduction = 400 fxOffset = 0, 0, 1.5 PROPELLANT { name = LiquidFuel ratio = 0.4 DrawGauge = True } PROPELLANT { name = Oxidizer ratio = 1.6 } atmosphereCurve { key = 0 345 key = 1 268 } } MODULE { name = ModuleGimbal gimbalTransformName = AJ-62_Engine_Nozzle gimbalRange = 4 } MODULE { name = ModuleAnimateHeat ThermalAnim = --None-- } MODULE { name = ModuleAlternator RESOURCE { name = ElectricCharge rate = 8.0 } } RESOURCE { name = ElectricCharge amount = 0 maxAmount = 0 isTweakable = false hideFlow = true } }