DEV BLOG

v0.2.8.2 Beta 6 Hotfix 2

May 19, 2026

Redux Team

KSP2 Redux contributors

v0.2.8.2 Beta 6 Hotfix 2

We have just released the second hotfix for the 6th beta of KSP2 Redux, which includes SAS stability improvements for spaceplanes and high dynamic pressure regimes, a number of tracking station, EVA and parts fixes, and various smaller quality-of-life refinements.

To install, use the Redux Updater app, do not download any files from this page manually.

New Content

Parts and tech tree

Added: Research storage to the SM+ conical crew pod
Updated: Stock SRB plumes now scale with atmospheric pressure

EVA

Updated: Kerbal helmets can only be removed above 0.15 atm of ambient pressure

UI/UX

Updated: Settings menu button transition times
Updated: Font assets refreshed with proper Chinese fallbacks
Updated: Localization updates from nightly translation runs
Updated: Credits
Removed: “Advanced Editor” toggle and gated module actions (the actions are now always available)

Bug Fixes & QoL Improvements

Flight and Map

Fixed: SAS overshoot when wings or other large lifting surfaces are attached
Fixed: SAS overshoot in high dynamic pressure regimes (helps spaceplanes hold attitude at high q)
Fixed: SAS not working when using command seats
Fixed: Changing vessel type swapping orbital velocity, flight stats and music between vessels
Fixed: Pressing Launch leaving the player stuck in the VAB after the loading screen
Fixed: “Obstruction” notification appearing when a deployable part breaks
Fixed: Renaming a vessel in the tracking station overwriting flag and mission entry names in the list

EVA

Fixed: EVA parachute in an external seat not using agency colors
Fixed: EVA parachute breaking swimming animations when the kerbal gets out of a seat in water

Parts and Thermal

Fixed: Aerodynamic stress incorrectly breaking fixed solar panels
Fixed: Repacking a parachute on the ground temporarily redeploying the chute
Fixed: Bobcat, Cheetah and XS booster shroud lengths
Fixed: Shakespeare solid rocket plumes

Construction

Added: Sticker bounding box display in the VAB
Fixed: Stickers causing glitchy reflections on VAB windows

Science

Fixed: Science experiment list in the report window now has a separated header

Graphics

Fixed: Small island airport disappearing

UI/UX

Fixed: Part sizes in the VAB not being translated

v0.2.8 Beta 6

May 17, 2026

Redux Team

KSP2 Redux contributors

v0.2.8 Beta 6

We have just released the 6th beta of KSP2 Redux, which adds a large batch of new parts including SM+ decouplers, boosters, command pod, probe cores, cameras and decals, EVA parachutes, vessel categories and map icons, KSP1-style orbital camera behavior, expanded maneuver node controls, campaign flag changing, supersampling, major SDK tooling improvements, a Lua-powered Patch Manager rewrite, and as always, a ton of bugfixes and quality-of-life improvements.

To install, use the Redux Updater app, do not download any files from this page manually.

New Content

Parts and tech tree

Added: Inline SM+ stack decoupler
Added: Inline SM+ stack separator
Added: SM+ solid rocket booster
Added: XS “Shrimp” solid rocket booster
Added: XS “Mantis” solid rocket booster
Added: SM+ conical crew pod
Added: SM+ inline probe core
Added: SM+ octagonal probe core
Added: Radial and downward camera parts
Added: Sticker decal part
Added: New camera tech node and updated SM+ tech tree placement
Updated: SM+ fuel tank and adapter models and textures
Updated: Bobcat and Cheetah engine models and textures
Updated: Bobcat and Cheetah engines now have shrouds
Updated: Bobcat and Cheetah engines now have audio
Updated: All Redux parts now have reentry meshes
Updated: Fairings now have an optional interstage node

Flight and Map

Added: EVA parachutes, including gliding, agency colors, and external seat support
Added: Aerodynamic stress now breaks deployed parts
Added: Vessel categories and icons for map/tracking station identity
Added: KSP1-style celestial (orbital) camera behavior
Added: Maneuver nodes can be added and edited while paused
Added: Scroll wheel precision input for maneuver gizmos
Added: Notifications when toggling normal and precision flight input modes
Added: Notifications when trim is applied or reset
Updated: Time warp limits are no longer applied in safe orbits
Updated: Physics warp status text and color now change when physics warp is enabled
Updated: Flags planted before updating the campaign flag now retain their original flag design

EVA

Added: Helmet toggling is available on oxygen worlds and in command pods

Science

Added: Stored research reports are now shown in the flight report window
Updated: Lowered minimum science rewards difficulty option to 10%

Missions

Added: Gateway tier 1 mission triumph video

UI/UX

Added: You can now change the campaign flag in the Settings menu
Added: “Advanced Editor” toggle in the Part Manager and Settings menu, with advanced part module actions moved behind it
Added: “Remove from symmetry” advanced part action
Added: “Add to Staging” toggle for docking ports
Added: “Preview Deployment” action for science parts in the VAB
Added: Mouse wheel scrolling in the R&D Center
Added: Color Manager tooltips
Updated: Mission Tracker button moved to the main VAB app bar
Updated: Bug Reporter is now localized

Graphics

Added: Supersampling setting for flight and VAB (improves anti-aliasing and visual quality at the cost of performance)

Bug Fixes & QoL Improvements

Construction

Fixed: VAB symmetry preview ghosts
Fixed: Radially attached symmetry parts creating empty stages
Fixed: Improved performance when placing parts (caused by staging updates during VAB change processing)
Fixed: Stage reordering bug
Fixed: Symmetry issues when docking vessels
Fixed: Vessel combination is now atomic during docking
Fixed: Symmetry interfering with action group deployment
Fixed: Copying a part not copying its resources
Fixed: Procedural wings not recalculating mass in the VAB
Fixed: Undo reverting the VAB camera to the root part
Fixed: VAB part finalization/tracking null references during loading
Fixed: Fairing construction being laggy in snap mode
Fixed: Fairing construction snapping outside snap mode
Fixed: Fairing snapping to the wrong diameter when adding a new segment
Fixed: Fairing material issues with transparent base colors
Fixed: Strut configurations causing launch explosions or VAB crashes
Fixed: Radiator extension and activation are now separate toggles
Fixed: Thermal tab missing from the Action Group Manager
Fixed: Color Manager preset bugs
Fixed: Docking ports, decouplers and abort action staging behavior in several edge cases

EVA

Fixed: Kerbal and sample container animations getting out of sync during time warp
Fixed: Kerbal ground checks causing null references

Flight and Map

Fixed: SAS/telemetry edge cases and wheel torque axis mismatch on rotated multi-wheel vessels
Fixed: Out-of-fuel maneuver duration calculation
Fixed: Maneuver nodes desyncing after thrust limiter changes
Fixed: Map raycasts when transform syncing is needed
Fixed: KSC entry breaking in the tracking station list after renaming vessels
Fixed: Decoupling/undocking assigning focus to the debris part via heuristic
Fixed: Cheat menu null reference during docking with the rendezvous menu open
Fixed: Kerbol shining through Kerbin
Fixed: Jool and Eve clouds being too bright
Fixed: Discord Rich Presence timer resetting when state changes
Fixed: Discord Rich Presence errors before a vessel is fully initialized
Fixed: Discord Rich Presence does not update when recovering a vessel
Fixed: Vessel validity checks in simulation
Fixed: Disposed removed portrait culling groups

Parts and Thermal

Fixed: Thermal system and heat shield tuning issues
Fixed: Parachute deployment forecast making parachutes deploy too early and bypassing the Risky state
Fixed: Active radiators disabling cooler/device state incorrectly
Fixed: Incorrect lifetime checks for Module_Color
Fixed: Deployable, fairing, engine, RCS, reaction wheel, wheel and science module edge cases
Fixed: Bobcat and Cheetah engine setup issues

Science, Tutorials and Missions

Fixed: “Mun or Bust” completing at the wrong apoapsis
Fixed: Pol’s Midlands experiments not being localized
Fixed: Crashing into Laythe ocean not being detected as a crash for mission objectives

UI/UX

Fixed: UI locks getting stuck after windows close
Fixed: UITK tooltip positioning and added more tooltip options
Fixed: Flag Site UI z-index, button localization and title styling
Fixed: Statistics module preventing revert to VAB
Fixed: Statistics manager errors when loading non-campaign saves
Fixed: Engineer Report icons now load asynchronously and cache sprites
Fixed: Bug Reporter localization coverage
Fixed: Chinese, Japanese and Korean font replacement null reference safeguards
Fixed: Various common null references and loading-state errors
Fixed: Color manager title spacing issues
Fixed: Color manager button text overflowing in some languages

Modding Support

SDK

Added: Part icon generation editor tooling including presets and category defaults
Added: Drag cube generation and visualization
Added: Reentry mesh generation and visualization
Added: Improved and simplified Plume editor (one-click VFX object gathering based on sub-plume hints)
Added: Part size registry and revised legacy part-size handling
Added: Fairing shroud preview in the editor
Added: Paintable shader custom editor
Added: Interaction presets, airlock and ladder interactions
Added: Unity Audio setup for modding and part audio preset authoring tools
Updated: Debug Tools bookmarks, including reentry testing bookmarks

Patch Manager

Updated: Patch Manager rewritten to use Lua scripting
Added: Fluent Patch Manager APIs and improved diagnostics
Added: Generated Lua stubs for IntelliSense/autocompletion support
Visual Studio Code extension for Patch Manager: https://marketplace.visualstudio.com/items?itemName=infinity-sys.pm-lua
Added: Patch passes and config values for patches
Added: Additional Lua selection helpers and V-SwiFT stubs
Added: Audio preset patching support
Added: Per-part PAM hiding flags
Updated: Improved patch ordering, caching, cache invalidation and summary/error reporting
Updated: Reduced Patch Manager overhead by removing extra JSON round trips and improving hot paths
Fixed: Improved Patch Manager performance and reduced unnecessary allocations

SpaceWarp and Redux-Lib

Added: REPL support to the SpaceWarp console
Updated: Reworked SpaceWarp console layout and styles
Updated: Config registration now uses the new config system across Redux-Lib and SpaceWarp
Added: Internal-only config value support

V-SwiFT

Updated: Variant swaps are now tracked in VAB history
Updated: Material and variant handling for Shakespeare/imported parts
Fixed: V-SwiFT swapping parts back to the default variant
Fixed: Flight-state transform activation
Fixed: V-SwiFT VAB attach-node and Patch Manager integration issues

UITK for KSP2

Added: AppShell control for unified window layout and theming
Added: C# dialog API and updated dialog styles
Added: Window resizing, draggable handle support and better game-input blocking
Added: Tooltip localization and automatic text resizing support
Added: Uppercase localization converter and converter API updates
Added: Moved shared Redux UI components into UitkForKsp2 for modders

Project Shakespeare / KSP1 Import

Added: Category list is now scrollable when overflowing
Added: Attachment node symmetry support
Updated: Improved KSP1 part import performance during loading
Updated: Improved KSP1 part performance in the VAB
Updated: Improved attachment node size and bulkhead size handling
Updated: Cached KSP1 textures by resolved file name
Updated: Faster texture loading/compression paths and reduced VRAM pressure
Updated: Improved plume scaling
Fixed: Reduced large allocations from file reads
Fixed: Part variants resetting
Fixed: Imported part resource lookup and user data module adaptation issues

Mod Breaking Changes

Patch Manager scripting was rewritten to use Lua. All existing patches will need to be rewritten in Lua, but the new system is more powerful and easier to learn.
Config registration was moved to the newer Redux/SpaceWarp config system. Mods using low-level config registration APIs may need to update.
UitkForKsp2 package names, namespaces, assemblies and theme structure were reorganized. Mods directly referencing old control namespaces or theme paths may need updates.
Part size handling was revamped. Mods or patches relying on old legacy part sizes should update their part metadata.

Redux Is Looking for More Volunteers

May 2, 2026

Redux Team

KSP2 Redux contributors

Redux is looking for more volunteers!

As we continue developing Redux and get closer and closer to the stable release, the amount of work needed to keep moving forward is increasing. We have very high ambitions, from continuing to fix and improve the base game to building out major systems like colonies, improving the visuals, adding lots of new parts, and also making the game accessible to more players.

Because of that, we are looking for more volunteers interested in helping with one or more of the following areas:

Unity and C# development: working on the game’s core systems, fixing bugs, improving performance, converting systems to ECS, and designing and implementing larger features such as colonies and other major gameplay systems.
Graphics programming and technical art: helping with the ongoing Built-in Render Pipeline to URP port, recreating and improving the game’s shaders, and working on things like new part shaders, reentry VFX, engine plumes, and other rendering, lighting and post-processing improvements.
3D art: creating new vessel and colony part models and textures, working on new celestial bodies, and helping define the asset pipeline and art guidelines we will use going forward.
2D art and animation: animating new in-game tutorial videos, mission animations, possible promotional material and YouTube videos, and concept art.
Graphic and web design: improving the website, preparing graphics for dev updates, and creating visuals and infographics for social media posts and other community-facing material.
Video editing: editing feature highlight and showcase videos
Translation: mainly Chinese (Traditional), Italian, Japanese, Korean, Portuguese (Brazil), and Spanish.

You do not need to be able to contribute all the time. This is still a volunteer project, and we know everyone has their own life, work, studies, etc. What helps the most is people who can communicate clearly and are passionate about the project.

If you are interested, please reach out to @.munix or @safarte on Discord. When you message us, please include a few references of your previous work, depending on what you want to help with. For example, this can be GitHub repositories or code samples, screenshots or renders of 3D models, shader work, animations, design work, etc. (You don’t need to provide references for translation or writing work, but if you have previous experience in those areas, feel free to share that as well.)

We cannot promise that every person who reaches out will immediately have something assigned to them, but if you have experience in one of these areas and want to help finish what KSP2 started, please reach out to us.

SAS Improvements

Apr 28, 2026

Redux Team

KSP2 Redux contributors

Hello all, I thought I’d write a quick blog post summarizing the main changes that we’ve done to SAS in KSP2 Redux, as I think it’d make for an interesting semi-technical overview.

Background

You might think that we could’ve just ripped KSP1’s SAS system into KSP2, but that approach would not have worked, mainly given that the core of the SAS logic in KSP2 is the same algorithm as it is in KSP1.

So then, why is SAS so stable in KSP1 while it is in KSP2, if the core is the same?

The simple answer is, it has to do with how data is fed into the SAS system, and how its outputs are applied to the controls, there has to be differences in there, maybe the data coming in is stale, or maybe the outputs are being applied differently. And this is what guided our changes and our investigations into the differences in the 3 main passes we looked into the SAS system.

Pass 1 - First Misguided Attempts

When I was first looking into the SAS differences, I started trying to look at how the outputs were applied, and I made the mistaken assumption that the SAS outputs were somehow going through Unity’s input system, and as such the outputs were being smoothed in a way that they weren’t in KSP2, so I tried replicating that input system to see if it improved this. The replication itself just made all the inputs feel sluggish and not fun to play with, and it did not even fix the issues with SAS in the first place, as such these changes were scrapped.

Though, I’m still mentioning this because one improvement did come out of this pass of looking at it, the stability improvements for command pods/probe cores that are the sole part of a vessel. Essentially, what was going on there was that the moment of inertia calculations for a single part were using unity’s own moment of inertia calculations directly, while every other case would apply some form of scaling to the moment of inertia based off of mass, so what I did here was just mirror the mass scaling for this case.

Pass 2 - Telemetry and other Improvements

Main Article: SAS, Flight Input, and Precision Mode

For this pass, we looked deeper into how the algorithm worked, and the data that is being fed into it, and there were 3 main things we noticed and subsequently fixed for Beta 5.

Coasting Logic The coasting logic in KSP2 was worse than KSP1 at predicting overshoots.
SAS Update Order The SAS commands were being sent out to the modules after the modules had updated their state for the frame, meaning they’d be applied later than before.
Telemetry Data The telemetry data being fed to the SAS was in the Update loop, meaning during time warp it would not be fresh, leading to stability issues

(More information on these changes can be found in the main article by Munix)

Pass 3 - Rigidbody Update Changes

The prior changes still weren’t enough to bring the SAS on par with KSP1’s performance and stability, so we decided to look further into it to see anything else that could be an issue, again focusing on the inputs to the SAS system, and where the outputs are going. By comparing this to KSP1, we found one crucial difference, which will require a bit of explanation.

ITorque

KSP2 Introduced interfaces for parts that apply torque and other forces to the main rigidbody that were not present in KSP1, in KSP1 all parts did these on their own immediately in their update cycle.

This change was part of what introduced the instability that this pass fixed, as this torque was no longer being applied immediately.

The Rigidbody Update Behaviour

So when was it being applied? During the RigidbodyBehaviour’s OnFixedUpdate method near the beginning of a physics update. The entire relevant loop, including other modules, looking something like

Begin the physics update
Copy Unity’s Rigidbody state into the data used for the simulation
Write back the current torque being provided by ITorque components and other forces to the Unity Rigidbody
Use the data copied in step 1 to update the SAS commands (SAS module)
Use the SAS commands to update part torque output (Parts with ITorque)
End the physics update

As can be seen in the loop, the actual torque output was not being applied until the next frame and the SAS was getting data fed into it that was read before these outputs were applied, so it had stale data and an output lag.

The Fix

The fix to this was quite simple, we just had to give the RigidbodyBehaviour 2 slots in the update cycle, rather than just one, keeping the early update for reading the data into the simulation state, then applying the outputs later in the cycle when everything has had a chance to update their torque and other physics outputs.

Meaning that the new correct loop in Beta 5 Hotfix 2 looks something like:

Begin the physics update
Copy Unity’s Rigidbody state into the data used for the simulation
Use the data copied in step 1 to update the SAS commands (SAS module)
Use the SAS commands to update part torque output (Parts with ITorque)
Write back the current torque being provided by ITorque components and other forces to the Unity Rigidbody
End the physics update

v0.2.7.2 Beta 5 Hotfix 2

Apr 28, 2026

Redux Team

KSP2 Redux contributors

v0.2.7.2 Beta 5 Hotfix 2

We have just released the second hotfix for the 5th beta of KSP2 Redux, which includes a bunch of minor bug fixes as well as further improvements to SAS stability.

You can install the update in the Updater application (If you don’t have it yet, download on the Updater GitHub page). - Simply select the newest beta (highest number) in the dropdown and click Install.

You can find the full changelog on the Redux GitHub page or on Discord: https://discord.com/channels/1078696971088433153/1444156522127954064/1498461514145730750.