Tools Extended Propellants

[Maxi]

Extended Propellants is a data-only mod for KSA. It adds liquid propane, the engine reaction liquid oxygen plus propane, and a yellow and orange exhaust plume for that reaction. It has no parts and no code. Other mods use it for their engines, for example Prisma by Purrline Rocketworks. On its own it changes nothing in the game.

Features

• ExtProp_C3H8: propane, with a liquid and a gas phase. Stored at 230.04 K (1 K below the boiling point, as the stock rule for cryogens), density 582.0 kg/m3.
• ExtProp_Propalox: the reaction of propane and liquid oxygen, 16 mixture ratios by 14 pressures (20 kPa to 120 MPa), default mixture ratio 2.7. It appears in the engine designer as a bipropellant.
• ExtProp_PropaloxPlume: an exhaust plume that is bright yellow at the nozzle and orange behind it.
• The tables are computed with CoolProp and NASA CEA with the method of the stock files. Every Id has the prefix ExtProp_, so it does not collide with other mods or a later stock propane.

For mod authors
Use the reaction in the Combustor of your engine and give the engine its own mixture ratio. The tanks fill themselves from the reaction of the engine they feed, so no tank XML changes. The README on GitHub has a complete example in the XML form of build 5801. A data-only mod cannot declare a dependency in its mod.toml, so list Extended Propellants as a required dependency in your listing in the Borea content index, and tell your players to enable both mods.

Installation

1. Download from GitHub Releases, or install it with Borea.
2. Extract into Documents\My Games\Kitten Space Agency\mods\ExtendedPropellants\.
3. The game finds new mods on the next start. Enable the mod in the mod dialog.

No mod loader is needed.

Version: 1.0.0 (validated against KSA build 2026.11.10.5801)
License: MIT
Source: GitHub
Download: GitHub Releases
Dependencies: none
My other mods: Prisma by Purrline Rocketworks | Facet by Purrline Rocketworks | Andoya Spaceport | AdvancedFlightComputer | DeltaVMap | MeasureTools