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Official release
10 wallpaper.jpg
Released 4/27/2015
Announcement KSP 1.0 is Released!
Steam Steam Community
0.90.0 1.0.1

Version 1.0 was released on April 27th , 2015. The update is known as "We Have Liftoff!", referencing the fact that 1.0 is the official release.



  • New Engineer's report Toolbar App, provides warnings and advice during construction, notifying players of possible design issues with their ships.
  • Added 'Cross-Section Profile' Filter to Parts List.
  • Added Thumbnail images for Craft files in both Launch Dialog and Craft Browser screens.
  • Added 'Merge' button to Load dialog, allowing ships to be loaded without replacing the current one. The craft loaded will be shown as a sub-assembly.
  • Added confirmation dialogs when overwriting a save, launching or leaving editor without saving.


  • Complete overhaul of the flight model.
  • Lift is now correctly calculated and applied for all lift-generating parts.
  • Drag is now pre-calculated automatically based on part geometry, and applied based on part orientation in flight.
  • Both lift and drag are dependent on density and the speed of sound; both properly calculated from temperature and pressure.
  • Stack-mounted parts can occlude each other for drag calculations.
  • Lift-Induced drag now properly simulated.
  • Stalls are now properly simulated.
  • A new body-lift system meaning parts can induce lift even if they are not designed to do so.

Heat Simulation

  • Completely revised part heating model, energy flux is considered, not merely temperature.
  • All game temperatures changed from 'Kervin' to proper Kelvin.
  • Radiative, conductive, and convective heating and cooling are simulated.
  • Parts can have individual radiative, conductive, and convective properties.
  • All parts now emit a blackbody radiation glow if they get hot enough.
  • Conduction between attached parts is more accurately modelled.
  • Parts can occlude other parts from being exposed to sunlight, celestial body albedo/radiation and supersonic flow.
  • Reentry/hypersonic flight heating is now simulated.
  • Added difficulty Setting to scale aerodynamic heating.
  • Atmospheric temperature, and thus density, takes latitude and sun position into account.
  • Celestial bodies accurately emit thermal radiation making nearby craft warmer.
  • Service modules, fairings and cargo bays can be used to protect parts inside from heat.
  • Heat shields provide (finite) ablation-based protection for parts behind them.


Internal Spaces


  • Added Ore resource, which can be mined across the Solar System.
  • New drill part “'Drill-O-Matic' Mining Excavator” added.
  • Ore container tanks added in Large and Small variants.
  • ISRU Ore processor unit added, converts Ore into Liquid Fuel, Oxidizer or MonoProp.
  • Three new Ore scanner parts added.
  • Added new MapView overlays displaying Ore density for all Celestial Bodies.
  • Support for moddability of resources added (including atmospheric and oceanic).
  • New Difficulty Setting to scale resource abundance (both stock and modded).
  • Asteroids can also be mined for Ore.
  • Engineer Kerbals are able to 'overdrive' drilling equipment for increased yield (and less safety).


  • Female Kerbals added, with new randomly-generated female names.
  • Valentina Kerman (Pilot) added to initial Crew Roster.
  • Kerbals are now able to clamber onto ledges within reach, because their jobs weren't dangerous enough already.
  • Kerbals can now climb out of ladders onto ledges.
  • Tourist Kerbals added. They have zero skills, are unable to control vessels, and are required to keep their heads inside the vessel at all times.
  • Kerbals now cost increasingly larger amounts of Funds to hire in Career Games.


  • Technology tree completely revised. Several new nodes added; many, many parts reassigned for a better progression.
  • Kerbal Scientists are now able to restore inoperable experiment modules.
  • The Science Lab has been retooled to run long-term research on experiment data, providing much higher amounts of science over time.


  • New Smoke effects added to Launchpads.
  • New Surface Effects added whenever rocket engines fire near terrain.
  • New Water Effect added whenever rocket engine fire near water.
  • Revised all part shaders for improved rendering of lighting effects and shadows.
  • Main Flight UI can now be made transparent.


  • Added new Tourism contracts.
  • Added ISRU resource extraction contracts.
  • Added Grand Tour contracts.
  • Replaced Rescue contracts with Recovery contracts, which can ask the player to recover a part, a Kerbal, or both, and can spawn on the surface of planets, with "props" nearby.
  • Added two 'immediate' Strategies to convert existing Reputation and Science into Funds.
  • Kerbin World-Firsts Record-Keeping Society contract line now extends all the way out to Eeloo, and is dependent on player progression.
  • Record contracts are now always active, and will complete in order even over the course of a single mission.


  • All tutorials revised and rewritten to explain most game features.
  • Expanded Flight Basics Tutorial to cover the essentials of launching into orbit.
  • Added new Return from Mun tutorial.
  • Added new Science and R&D Tutorial.
  • Added new Docking tutorial.


  • 'Warp To' action added to orbit context menu. Allows warping to a specific spot along your trajectory.
  • 'Warp to next morning' button added to KSC toolbar.
  • Asteroids can now be found orbiting near Dres.
  • Engine thrust now varies according to Isp and throttle setting, instead of the other way around.


  • Completely revised Input Mapping system.
  • Flight input bindings is now much more straightforward and more flexible as well.
  • Duplicate control bindings for Docking/Staging modes now replaced by a much more robust system based on secondary key bindings.
  • Joystick Axes are now consistently enumerated and persist across sessions.
  • Up to 10 joysticks with 20 axes each now supported.
  • Added secondary channels for Axis Bindings.


  • New 'Chase' Camera mode added, old mode now called 'Locked'.
  • Added Camera wobble/vibration effects during flight (engine vibration, explosions, ground roll, G-force, and many more).
  • TrackIR support added to all game views (toggleable independently in game settings). (FreeTrack also reported to work).
  • Added FOV control to main flight camera. (Hold ModKey and zoom).


The demo now uses 1.0 as a base. Demo restrictions include:

  • Part loading limited to 26 basic parts.
  • Career Tech Tree is smaller to fit the 26 parts.
  • No Plugin loading.
  • SPH and Runway Facilities are inaccessible.
  • Only one save profile allowed.
  • Cannot launch new flights if 3 or more are already in progress.
  • Kerbin, Mun, Minmus, and Kerbol are the only celestial bodies in the Kerbol system.
  • Revised tutorials and scenarios to be compatible with the demo set of parts.
  • Removed the Station One and Mun Orbit scenarios as those require parts from the full version.

Bug Fixes and Tweaks


  • Fixed several issues with editor attachments, attachment node orientation and symmetry.
  • Shift+Clicking a 'frozen' part in the editor will detach it from its parent.
  • Fixed several bugs with cloned parts and persistence.
  • The editor no longer requires a full scene reload to load new craft files.


  • The KnowledgeBase panel for Vessels now shows 'Max Accel' and 'Estimated burn time to 0m/s' (as shown on navball) fields.
  • Several part context menu actions now properly apply to symmetry counterparts automatically.
  • Added new custom cursors.


  • Fixed 'infiniglide' bug.
  • Switching SOIs no longer causes the next orbit to change at high time warp rates.
  • Added a warp speed limit when approaching an SOI transition.
  • Kerbal EVAs should no longer fly off when disembarking in space.
  • SAS now disengages autopilot modes automatically (and falls back to stability assist) in cases where the target vectors would change very rapidly.
  • Parachute deployment should no longer cause vessel disassembly at high physics warp rates.
  • Deployed parachute sway now actually has an effect on the vessel.


  • LV-N "Nerv" Atomic Rocket Motor now runs solely on Liquid Fuel and has no gimbal.
  • Oscar-B Fuel Tank can now be surface attached.
  • Air-breathing engines now drain fuel evenly from all tanks in a vessel.
  • Fixed radial decouplers not applying ejection forces correctly.
  • Parachutes no longer cause massive G spikes when opening.
  • Control Surfaces can now be deployed as flaps, controllable via context menus and Action Groups.
  • Stats of Antennas revised for a proper progression with the more advanced models.
  • Added nicknames to all engine parts.
  • Revised and balanced part costs.
  • Balanced fuel amounts for Mk2 and Mk3 tanks.
  • Balanced engines (Isp/thrust/mass) in line with the new aerodynamics.
  • Added fuel gauge to LV-1 "Ant" Liquid Fuel Engine.
  • Materials Bay now faces away from the part it's radially attached to.
  • RoveMate rover body is now a probe body as well.
  • The unshrouded solar panels are now non-retractable.
  • Balanced probes electric charge usage, mass and crash tolerance.
  • Lowered crash tolerance of the Structural Pylon to 70 from 999!
  • All parts given 'bulkhead profile' tags in cfg files. Profile tags inferred automatically for parts missing this field.
  • Cargo bays now properly detect enclosed parts, and can be grouped to make larger bays.
  • Experiment Modules, Solar Panels, Antennas and such will not deploy while stowed inside a fairing or cargo bay.
  • RCS thrusters will not function if stowed inside a closed cargo area (or fairing).
  • Lifting surfaces will not generate lift if stowed inside a closed cargo area (or fairing).


  • Much improved flight ambience sounds for Kerbin and other bodies with atmospheres.
  • Added new sound effect when pulling high G forces.
  • Eliminated audible gaps on several looping clips.


  • Improved sound/particle effects for all Air-Breathing engines.
  • Splashdown effects no longer spawn underwater.


  • All part textures converted to DDS format, load times are now 3x faster.
  • Fixed a serious persistence bug which prevented Scenario/Training saves from updating scenario modules properly.
  • Fixed persistence bugs which caused state data from Upgradeable Facilities to carry over to other saves.
  • Fixed an issue which caused Kerbals to not be generated randomly enough, which led to slowdowns with larger Crew Rosters.
  • Fixed issues with the terrain during scene switching making scene load times faster.
  • Fixed terrain scatter generation which was causing memory leaks.
  • 'Elon Kerman' added to name pool.
  • Crew name generator can now output 10,000+ female names.
  • Fixed an issue with markers in the KSC scene potentially causing the game to lock up.
  • Restructured GameData folder, integrated the NASA folder into the Squad one.
  • Valentina Kerman added to Main Menu's Space scene.


  • All contracts other than World Firsts or Records are halted until the player reaches space.
  • Prevent "stacking" of various contract types.
  • Resource parts added into satellite, station, and outpost contracts.
  • Prose of contracts involving Kerbals re-evaluated with gender appropriate text.
  • All contracts in career given balanced income for all three currencies.
  • Science and reputation no longer scale with the celestial body of a contract, and are handed out more conservatively in general.
  • All strategies in career given equivalent exchange rates.
  • Aggressive Negotiations strategy given a discount on building repair/upgrade.
  • Recovery Transponder strategy now lowers maximum recovery rate, while raising minimum recovery rate.
  • Facility upgrade costs re-evaluated, lowered by about a quarter overall.
  • Kerbals now properly receive experience for suborbital flights.
  • Part Test contracts now request much saner flight parameters.
  • Survey contracts choose much saner locations to survey.
  • Sensor Experiment Modules are now able to perform experiments in all situations.


  • The R&D Tech tree is now defined in a cfg-file.
  • The cfg file for the Tech Tree is defined separately for each save.
  • GameVariables methods are now all virtual and can be overwritten by mods.
  • Added a new set of debug tools to tweak Physics parameters.
  • Added a new set of debug tools to tweak R&D tech tree nodes and part assignments.