EasyISP - A Mod for Kerbal Space Program

Current Version - v1.3.1

EasyISP is a KSP 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 keeping each engine’s curve shape and relative behavior intact. 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 (covers ModuleEngines and ModuleEnginesFX) via ModuleManager.
• Scales all engines ISP uniformly while preserving their relative performance profile.
• Supports B9PartSwitch engine subtypes. Stored engine configs are scaled so switching modes preserves the EasyISP multiplier.
• No in-game UI required; effects apply automatically on game load.
• Uses ModuleManager :FINAL pass so the multiplier is applied last after other mods.

Installation

Install EasyISP via CKAN for an automated setup; CKAN installs the same files/layout described below.

Manual installation

• Download the latest release of EasyISP or the ZIP from SpaceDock.
• Extract the downloaded archive.
• Copy the EasyISP folder into your KSP GameData directory.
• Launch KSP.

Instructions

After installation, EasyISP applies its ModuleManager patches automatically during game load. No additional setup is required for the default behavior; the default ISP multiplier is 2.

Customize ISP away from the default value

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

• Open GameData/EasyISP/EasyISP.cfg.
• Find the EASYISP_SETTINGS block.
• Set ispMultiplier to scale ISP for all engines.
• Save the file and restart KSP.

Support

If you encounter any issues or have suggestions for improvements, please feel free to open an issue on the GitHub repository.

License

This project is released into the public domain under The Unlicense, which means you can use, modify, and distribute it without any restrictions. More details can be found in the LICENSE file.

Acknowledgments

• Special thanks to the Kerbal Space Program community for their valuable feedback and support.