Space Engineers

Set ship speed:
Create a new folder in the game’s mod directory, located at
„Users[username]AppDataRoamingSpaceEngineers”. The name of the new
folder does not matter. Inside the new folder, create another new folder
called „Data” (case-sensitive). Copy the „Enviroment.sbc” file located
at „Program Files (x86)SteamSteamAppscommonSpaceEngineersContentData”
into the new „Data” directory.

Use a text editor to edit the copied „Enviroment.sbc” file and change the
following values as desired. The minimum value is 0 and the maximum value
is half the speed of light.

< SmallShipMaxSpeed>100
< LargeShipMaxSpeed>100