SSTO project add wide range of high-performance spacecraft parts

License: MIT

Game Version: 1.12.3

Source code: Monniasza/SSTO-Project

Downloads: 12,258

Author: Monniasza

Mod Website: Forum Thread

Followers: 11

Information Changelog Stats

Report bugs here

Supported mods:

  • SpaceY (both mods) - for large nuclear engines
  • Making History - Size 1.5 nuclear engine
  • HGR - high performance chemical engines

Planned supported mods:

  • HGR - Different size 1.5 nuclear engine
  • Sea Dragon - ultra-large nuclear engine
  • Behemoth Aerospace Engineering - high power large nuclear engines
  • Mk2 expansion - Mk2 nuclear engines
  • Mk3 Expansion = Mk3 nuclear engines
  • Bluedog Design Bureau - High performance chemical and nuclear engines
  • Explodium Breathing Engines - Liquid Fuel from flammable atmospheres
  • KSP Interstellar Extended - MonoPropellant from inert atmospheres

Recommended mods:

Kerbal Engineer Redux - to correctly display performance of nuclear jets

Upcoming update:

  • air liquefiers, which produce Oxidizer by default or also Liquid Fuel and Monopropellant with mods
  • LPG engines and fuel. The patch works with any LFO or jet engine. SSTO Project LPG is required

Isp boost for LPG/O:

  • BDB engines: 25%
  • Realistic engines: 4%
  • Stock, other and unknown engines: 6% Isp boost



  • Toroidal Aerospike Nuke - a high-performance nuclear engine intended for use in SSTOs with Real Solar System
  • Advanced Aerospike Jet Engine - a high-performance aerospike hypersonic turboscramjet and cooled rocket for use with oxygenated atmospheres
  • NSABRE - a high-performance nuclear aerospike hypersonic turboscramjet and NTR hybrid for use with all atmospheres
  • SuperJet - hybrid IGRAF/ABGRAF (internal gas recirculation aerial fusion/air breathing gas recirculation aerial fusion) air-augmented jet and rocket engine
  • NAo, NA0, NA1, NA2, NA3, - stockalike high performance nuclear engines
  • NB - Making History-like high performance nuclear engine
  • N×1, N×2, N×3 - SpaceY-like high performance nuclear engines
  • No, N0, N1, N2, N3, - stockalike nuclear engines
  • NA - Making History-like nuclear engine
  • N+1, N+2, N+3 - SpaceY-like nuclear engines
  • BR-1, BR-2, BR-3, BR-4 - high performance chemical 2.5m rockets
  • MR13 "Soyuz Launcher", MR12 "Doubly Intermediate", MR11 "Medium Interplanetar" - high performance chemical 1.875m rockets


  • Cyclotron - aerial fusion reactor for creating large amounts of electricity from liquid fuel. Each unit of fuel provides 52.800 gigajoules of energy.
  • Nuclear Battery - battery which stores large amounts of electricity


  • Wings and Elevons ending with "+" in name - aerodynamic surfaces with 10 times more aerodynamic strength


  • Science Room, Science Package, Advanced Science Package and Ultimate Science Package - next tiers of science labs, each weighs 10 tons and has 6 seats, last one is experiment too.


  • Air Liquefiers - convert different planetary atmospheres into MonoPropellant (for 100% MP, use KSPIE with any atmosphere), Oxidizer (oxygenated atmospheres only) and LiquidFuel (optionally requires Explodium Breathing Engines)
  • Fuel Scoop - slowly generate small amounts of fuel


  • "Exotic Aircraft Engines" node - for SuperJet
  • "Heaviest Rocketry" node - Vector and Twin-Boar rocket engines
  • Change tech of external seat to "Start"
  • Change tech of Size 1 pod to Engineering 101 Science:
  • Ultimate Science Package is now its own experiment - see science parts Planned parts:
  • BNE-1, BNE-2 - Behemoth Aerospace Engineering-like nuclear engines
  • BNE+1, BNE+2 - Behemoth Aerospace Engineering-like high performance nuclear engines

Planned revival of following mods:

How revival works:

  • For free license mods author is notified and mod is revived at the same time.
  • For restricitve mods, author is asked and then mod is revived.
  • Anyway, credit goes to the original author.

Check out the add-on, SSTO Project LPG and my new game, MultiMachineBuilder

Version 1.4.5 for Kerbal Space Program 1.12.3

Released on 2021-04-04

BUG FIX: Fixed nuclear battery

Download (1.32 MiB)

Version 1.4 for Kerbal Space Program 1.9.1

Released on 2021-01-31

  • LPG tank enhancements
  • Hypersonic Nose Cone
  • Filter Extensions support

Download (1.31 MiB)

Version for Kerbal Space Program 1.9.1

Released on 2020-08-30

Minor update KSP 1.8.x - 1.9.x supported Added KSP-AVC support

Download (1.10 MiB)

Version 1.3.3 for Kerbal Space Program 1.8.1

Released on 2020-08-21

Overhauled LPG system - old parts do not work LPG tanks have maximum performance without any tweaks

Works with KSP 1.9.x too.

Download (1.10 MiB)

Version 1.3.2 for Kerbal Space Program 1.8.1

Released on 2020-08-03

HOTFIX - LPG tanks do not have anything when not using Modular Fuel Tanks

Works with KSP 1.9.x too

Download (572.18 KiB)

Version 1.3.1 for Kerbal Space Program 1.8.1

Released on 2020-07-17

  • Added XN-1 "Chernobyl" Nuclear Engine
  • Procedural Start compatibility for LPG and LPG/O tanks
  • Post pictures

Works with KSP 1.9.x too

Download (572.16 KiB)

Version 1.3 for Kerbal Space Program 1.8.1

Released on 2020-07-08

Added SuperSAS, UltraSAS and HyperSAS Added coronavirus Fixed nuclear engines Fixed handling of engines with tanks LPG and LPG/O tanks have identical dead weight Added procedural LPG and LPG/O tanks NSABRE and SuperJet now work in oxygenless atmospheres without KSPIE

Works with KSP 1.9.x too

Download (63.66 KiB)

Version 1.2.2 for Kerbal Space Program 1.8.1

Released on 2020-06-26

HOTFIX- now compatible with TETRIX tech Tree

Download (40.74 KiB)

Version 1.2.1 for Kerbal Space Program 1.8.1

Released on 2020-05-31

Fixed regex exception in LPG module Finally, LPG module fully supports pure tanks and pure engines (Twin-Boar and Munar Excursion Module soon) Added "Permafrost" Inline Cryocooler

Download (40.18 KiB)

Version 1.2 for Kerbal Space Program 1.8.1

Released on 2020-05-30

[BETA] Added LPG and All Altitudes Nuke

Download (39.27 KiB)

Version 1.1 for Kerbal Space Program 1.8.1

Released on 2020-05-08

Added Toroidal Aerospike Nuke

Download (24.66 KiB)

Version 1.0 for Kerbal Space Program 1.8.1

Released on 2020-05-03

No changelog provided

Download (15.91 KiB)

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