EasyISP — A Mod for Kerbal Space Program

EasyISP is a Kerbal Space Program add-on that increases engine efficiency so your rockets can go farther on the same amount of fuel.

In KSP, higher ISP means you get more delta-v from a single tank. EasyISP applies ModuleManager patches that edit the atmosphereCurve on each targeted Engine module (including ModuleEngines and ModuleEnginesFX), applying a predictable global ISP multiplier while preserving each engine’s curve shape and relative behavior.

The default ISP multiplier applied by EasyISP is 2.

Tune ISP down for a tougher career, up for a more relaxed game, or push into near-future performance and simulate fictional settings like The Expanse.

EasyISP is designed as a global multiplier that scales the final ISP values produced by your full mod stack.

Features

• Applies a global ISP adjustment across engine atmosphereCurve data
• Modifies each targeted Engine module via ModuleManager
• Scales all engines ISP uniformly while preserving relative performance
• No in-game UI required; effects apply automatically on game load
• Applied late in the load process to ensure compatibility with other mods

Installation

Manual installation

• Download EasyISP from this SpaceDock page or from the GitHub releases page
• Extract the downloaded archive
• Copy the EasyISP folder into your KSP GameData directory
• Launch KSP

Usage

After installation, EasyISP applies its ModuleManager patches automatically during game load. No additional setup is required for default behavior.

Customize ISP

You can adjust the global ISP multiplier to tune overall engine efficiency.

• Open GameData/EasyISP/EasyISP.cfg
• Locate the EASYISP_SETTINGS block
• Set ispMultiplier to the desired value
• Save the file and restart KSP

Support & Source

EasyISP is developed and maintained on GitHub:

• Repository
• Issue tracker

Bug reports, suggestions, and contributions are welcome.

License

This project is released into the public domain under The Unlicense.
You are free to use, modify, and redistribute it without restriction.