Build: 3135 Mode: Creative Mode: Single Player Reproducibility: Always Severity: Minor Type: Signals Summary: Any thrusters that are assigned to turn on/off with a signal switch will have zero torque contribution if the signal switch is off when either the thruster is bound to it, or when the game is loaded with the switch in the off state. Description: There is a case when you are using signal switches to control thruster activation that can result in the thruster providing lateral thrust when activated, but providing no torque contribution for rotating this ship. This can be verified by looking in the statistics panel and noting a zero torque contribution from the thrusters even though they are on. This also affects ships during game load as detailed in the steps below. Steps to Reproduce: 1) In a creative orbit game, load the attached blueprint and fuel it. This CV has 4 engines, with two facing forward and two facing backward. You should be able to move the ship forward and backward and rotate it side-to-side. 2) Now bring up the control panel. There is a custom signal switch labeled "Thruster Power". Verify that it is off. 3) In the Signal Logic tab, assign all four thrusters' On/Off inputs to the "Thruster Power" signal. This should disable each thruster in turn. 4) Close the control panel. Verify that the thrusters are off, and you have no lateral or rotational movement. 5) Open the control panel and activate the "Thruster Power" signal switch. You can now move the ship forward and backward, but there is still zero torque contribution so the ship will not rotate. Toggling the "Thruster Power" signal switch, the "Thrusters" main switch, or the "Power" switch does not restore any torque capability. 6) Now set the control panel to the following state: "Power" on, "Thruster Power" signal off. Close the game and restart it. Note that the ship is still in this broken state with no torque after you turn the thrusters back on. 7) Repeat step 6, but leave the "Thruster Power" signal active before restarting. When you restart the game, the thrusters will be fully operational. At this point toggling the signal switch or the main "Thrusters" switch will disable lateral movement of the engines correctly, though in both cases the thrusters will still provide torque so you can rotate the ship. There is likely a second bug here detailed in step 7 where disabled thrusters still allow the ship to be rotated. This is observable with any ship by simply turning the main thruster switch off. Update: I changed the language from "RCS contribution" to "torque contribution". I incorrectly use the two terms interchangeably, but I want to clarify that this is not related to RCS devices.