Real Scale Boosters

Realistically scaled rocket parts, with real-world stats and performance, based on actual rocket designs.

License: CC-BY-NC-SA

Game Version: 1.9.1

Downloads: 215,300

Mod Website: Forum Thread

Followers: 158

Outdated Mod

This mod is not known to work with the latest version of Kerbal Space Program. Proceed with caution.

Information Changelog Stats

Real Scale Boosters - Parts Pack

Realistically scaled rockets, somewhat loosely based on real world counterparts, with reasonably accurate stats.

NOTE: This is still in alpha/beta state. Parts and features are still being added, and things can and will change.

Required Dependencies:

  • Module Manager

Highly Recommended:

  • Hangar Extender (practically a must-have)

  • Kerbal Joint Reinforcement

  • Real Solar System

  • FAR

  • Community Tech Tree (if not playing in Sandbox mode)

Currently Supported:


  • TweakScale

  • CommunityTechTree and/or SpaceY-Lifters's tech nodes


Simply copy the "RealScaleBoosters" folder into your GameData folder. If upgrading from a previous version, be sure to delete the old one from GameData first (this is the cleanest option).


These rocket parts ARE NOT stock balanced! They're using the real world mass ratios, thrusts, ISPs, dry weights, and so on.



This pack is intended for use with "Real Solar System", or otherwise a more realistic scale version of Kerbin. The parts included will likely be severe overkill in a more normal KSP installation.

This pack provides a variety of "Kerbalized" versions of real world boosters. These are not meant to be true replicas. Where we've been able to get decent numbers for the real world counterparts, we have tried to get the sizes, masses, fuel capacities (in terms of mass), thrust, and ISP numbers close to correct. The art assets attempt to capture the overall shape and look of their real counterparts, matching the colors and dimensions, but perhaps not all of the details. Precision wasn't a requirement in building this pack. Rather, it's meant to be closer to the "SpaceY" art style, but functionally replicating real boosters.

You will also notice that this pack includes only the boosters, and not the payload portions of these rockets. For example, the Saturn V parts are included from the bottom, up to and including the third stage (and Instrument Unit), but no Apollo spacecraft. The Space Shuttle parts will build you a working LH/LOX tank ("soon") and SRB combo, but does not have an Orbiter. The idea is to build your own payload and use realistically performing analogs to the boosters used in the real world. To that end, some adapters and fairing parts are included so that other KSP parts will function with these boosters.

While some parts already have a diameter close to a standard KSP size, they're still slightly different. If it's close enough, I've included a little bit of a rim that will help hide the transition when attaching stock parts. If it's too far off, an adapter is often the better way to go. For instance, the Atlas V's first stage is 3.81m. A simple rim works in this case when attaching a Kerbodyne 3.75m tank.

Usage Notes:

  • None of the engines have bottom attachment nodes, or auto-shrouds. Instead, the mod functions more realistically, with interstages that are matched to the stages that use them, and engines can be mixed and matched inside of them (space permitting). Usually you will need to place the engines first, and then snap the appropriate interstage on afterward (whose attachment node may be hidden inside the tank).

  • Because different rockets historically have had different staging sequences, some of which place ullage motors on the interstages (Saturn V for instance), sometimes the stage's fuel tank has a decoupler node. Attachment nodes for the interstages may be hidden inside the tank butt, and usually are aligned with the exterior fuselage, rather than the end of a bulging dome or tank butt.

  • Realistic numbers have been used where possible, but sometimes available data online is rounded or imprecise, or have changed over the years so they are inconsistent. Numbers may be tweaked in the future if better information becomes available. Part sizes should be reasonably correct, but sometimes we lose a half meter or more somewhere.

  • In the available data, SRBs often are described in terms of either peak thrust, or average thrust. In the real world they have a highly variable thrust profile (by design). In KSP they use a single, invariant thrust level. We've opted for using a number somwhere between the average and peak thrusts. You may find the burn times shorter than the real world counterparts as a result, unless you use thrust limiting.

  • Real world RCS and attitude control thrusters tend to be very weak compared to what we're used to in KSP. For example the thrusters in the Delta IV upper stages are supposed to have less than 0.04 thrust. In KSP that feels almost useless, so we've opted for numbers closer to KSP's usual RCS thrusters.

  • By default RSB uses the stock LiquidFuel, Oxidizer, and MonoPropellant, but with the correct amounts of mass, so that the performance is consistent with the real rockets. Compatibility patches for Real Fuels (for example) should be forthcoming eventually.

  • These rockets are reasonably stable under the stock joint strength, and stock aerodynamics, since the part count is low. KJR and FAR are still recommended for a good experience though.

Known Issues:

  • The Atlas V 500-series procedural fairing doesn't want to stretch straight up cylindrically around the Centaur at the correct diameter. It has to widen slightly first.

Version 0.16 for Kerbal Space Program 1.9.1

Released on 2018-03-12

0.16 (2018-03-12) - Tweaks, Compatibility, etc

  • Added an exclusion for RP-0, for the RSB customized Tech Tree.

  • Corrected a ModuleManager error in the customized tech tree.

Download (24.27 MiB)

Version 0.15 for Kerbal Space Program 1.3.1

Released on 2016-10-12

0.15 (2016-10-12) - KSP 1.2 Update.

  • Updated categories for many parts.

  • Added KerbNet and transmitter modules to probe core parts.

Download (24.27 MiB)

Version 0.14.5 for Kerbal Space Program 1.1.3

Released on 2016-06-22

0.14.5 (2016-06-22) - Fix.

  • Restored the flag decals to the correct shader now that KSP 1.1.3 has addressed the transparency issue.

Download (24.27 MiB)

Version 0.14.4 for Kerbal Space Program 1.1.3

Released on 2016-05-31

0.14.4 (2016-05-31) - Hotfix.

  • Fixed a capitalization error in the tech tree patches.

  • Corrected the logic surrounding whether to use SpaceY or CTT tech nodes when both mods are present.

Download (24.27 MiB)

Version 0.14.3 for Kerbal Space Program 1.1.2

Released on 2016-05-25

0.14.3 (2016-05-25) - Stuff.

  • Switched attachment positions for verniers on sample Delta II & III rockets.

  • Added a correction for the RS-25 engine to use the correct stock model even if Ven's Stock Revamp attempts to change it.

Download (24.27 MiB)

Version 0.14.2 for Kerbal Space Program 1.1.2

Released on 2016-05-23

0.14.2 (2016-05-23) - Hotfix for RealFuels.

  • Disabled RF mulitplier patch. SolidFuel amounts were getting muliplied twice when RealFuels is used without RealismOverhaul.

Download (24.27 MiB)

Version 0.14.1 for Kerbal Space Program 1.1.2

Released on 2016-05-20

0.14.1 (2016-05-20) - Tweaks.

  • Slowed hose-retraction animation in umbilical tower.

  • Widened base of umbilical tower just slightly, to avoid z-fighting when clipping two together.

  • Added "secondary" umbilical tower that can more easily be clipped inside the main Delta tower.

  • Added small box-colliders to the hose mounts on Delta umbilical towers, to be able to grab them individually when clipped together.

  • Added second umbilical to sample Delta II and III rockets.

Download (24.27 MiB)

Version 0.14 for Kerbal Space Program 1.1.2

Released on 2016-05-19

0.14 (2016-05-19) - Launch Stability.

  • Updated sample rockets to stage the engines ahead of the launch clamps.

  • Added multiple launch clamp designs, plus a Delta Umbilical Tower.

  • Updated several sample rockets to use new launch clamps & tower.

Download (24.21 MiB)

Version 0.13.1 for Kerbal Space Program 1.1.2

Released on 2016-05-09

0.13.1 (2016-05-08) - Texture Recompression.

  • Re-compressed several DDS textures to the correct size.

Download (23.49 MiB)

Version 0.13 for Kerbal Space Program 1.1.2

Released on 2016-05-05

0.13 (2016-05-05) - Update.

  • Adjusted all white textures to make the speckling slightly more subtle.

  • Probe core parts (upper stages with avionics, Saturn IUs) "keep-alive" electrical usage lowered by 20% to match 2.5m stock probe core.

  • Added more Delta-II components: Delta-K upper stage + engine, interstage decoupler, fairings.

  • Updated sample Delta II rocket.

Download (34.75 MiB)

Version 0.12.3 for Kerbal Space Program 1.1.2

Released on 2016-04-25

0.12.3 (2016-04-25) - Bug fixes and Cleanup.

  • Added a config patch that cleans up the "RSBclass" log spam.

  • Fixed many "transparent flags" in the VAB by switching to the KSP/Alpha/Cutoff shader.

  • Fix for surface-effects on Castor 30/120 and RL10B-2 engines.

  • Added missing decoupler FX for several parts.

  • Re-enabled Atlas V 500 boattail style procedural fairing.

    • Fixed a "NullReferenceException" associated with this fairing.
  • Fixed a visual glitch with some of the Atlas interstage/fairing parts.

  • Corrected some radius issues with Atlas V procedural fairings.

  • Added a note in the description for all parts that decouple at the bottom node.

Download (22.05 MiB)

Version 0.12.2 for Kerbal Space Program 1.1

Released on 2016-04-23

0.12.2 (2016-04-22) - Hotfix.

  • Adjusted the custom tech nodes to still be created when the optional stockification patches are used.

Download (22.03 MiB)

Version 0.12.1 for Kerbal Space Program 1.1

Released on 2016-04-23

0.12.1 (2016-04-22) - Transparency fix.

  • Corrected the "always transparent" problem in the VAB editor for interstages/decouplers in 1.1.

Download (22.03 MiB)

Version 0.12 for Kerbal Space Program 1.1

Released on 2016-04-22

0.12 (2016-04-22) - Update.

  • Enabled surface attaching to the Saturn procedural fairing bases (for strutting).

  • Disabled Atlas 500 procedural fairing boattail from menus, since it's not attaching properly in 1.1.

  • Added Atlas 500 procedural fairing based on the interstage instead.

  • Added decoupling node to bottom of Centaur, Agena, and Castors, and updated sample rockets.

  • Adjusted and added more settings for the Stockification patches.

  • Added search tags for the DeltaIV SRMs (GEM-60).

  • Added collider settings for procedural fairing bases.

  • Corrected radial attachment point for Delta III first stage tank.

Download (22.03 MiB)

Version 0.11.2 for Kerbal Space Program 1.1

Released on 2016-04-18

0.11.2 (2016-04-18) - Tweaks

  • Lowered the snap radius threshold for some procedural fairings.

  • Corrected Delta II tank fairing attachment points.

  • Added the correct Delta II procedural fairing base (it referenced an existing model as a placeholder prior to this).

Download (21.98 MiB)

Version 0.11.1 for Kerbal Space Program 1.1

Released on 2016-04-17

0.11.1 (2016-04-17) - Update.

  • Corrected the Carrack procedural fairing's starting radius, instead of breaking it. ;)

Download (21.95 MiB)

Version 0.11 for Kerbal Space Program 1.1

Released on 2016-04-17

0.11 (2016-04-17) - Update.

  • Added Delta II First stage tank, procedural fairing, and nose cone (other parts delayed).

  • Converted Delta II/III texture to DDS.

  • Corrected GEM-40 radial attachment point.

  • Corrected the Carrack procedural fairing's starting radius.

  • Added some variables and various adjustments to facilitate optional stockification patches.

  • Fixed a problem preventing Ariane V SRBs from gimbaling in both axes.

  • Added a fairing base (8.4m) for the STS/DIRECT rocket family, matching the existing decouplers.

  • Enabled surface attachment on most procedural fairing bases, for strutting.

Download (21.95 MiB)

Version 0.10 for Kerbal Space Program 1.1

Released on 2016-04-10

0.10 (2016-04-10) - Update + KSP 1.1 readiness.

  • Renamed the radial decoupler "SRM Decoupling Kit" to be more generic than "GEM-60 Decoupling Kit".

  • Added URLs to the README.

  • Deprecated & disabled the "default custom tab" for the VAB/SPH menus.

    • Config file renamed to ".txt" ("RealScaleBoosters/Category/CustomCategory.txt").

    • Can be renamed back to ".cfg" if you want to experiment with it.

    • Will no longer be maintained, due to improvements in the VAB search options.

  • Added search tags to many parts.

  • Added Athena parts (and sample rockets), utilizing the existing Castor 120 stages.

Download (21.85 MiB)

Version 0.9 for Kerbal Space Program 1.1

Released on 2016-03-18

0.9 (2016-03-18) - Update.

  • Removed the remaining deprecated RCS config from the Delta III first stage tank's part CFG.

  • Added Saturn S-II-8 and S-IC-8 stages, and associated decoupler, to enable making Saturn C-8 (Nova).

  • Added Saturn C-8 sample rocket.

Download (21.56 MiB)

Version 0.8.1 for Kerbal Space Program 1.0.5

Released on 2016-03-14

0.8.1 (2016-03-14) - Fixes

  • Altered the ETS Saturns (IC & Multibody) sample rockets to use F-1A engine.

  • Altered the blue engine FX to be slightly more stockalike (particularly, less spread and less saturation).

  • Fixed colliders on the GEM-40 (Delta II) SRM.

  • Fixed missing Carrack procedural fairing base.

  • Removed RCS-Verniers from Delta III first stage tank.

  • Added LR-101 Vernier Engine, and updated Delta III sample rocket to use it.

Download (21.14 MiB)

Version 0.8 for Kerbal Space Program 1.0.5

Released on 2016-03-12

0.8 (2016-03-12) - The "briefly flew" update.

  • Added Delta III parts and sample rocket.

  • Added Saturn I variant parts (S-IV stage + interstage-decoupler, S-I stage fins, RL10-A3 engine, etc).

  • Split the Agena-D model into two pieces, for easier modding of this mod.

  • Spherical propellant tanks moved to FuelTank menu category, and fuel oriented tech node.

  • Added Castor120/Carrack procedural fairing base.

  • Rebalanced the audio slightly for many engines.

  • Added more support for FilterExtensions, with icons.

  • Added Rocketdyne F-1A engine variant (using the F-1 model, config tweaked by VenomousRequiem).

Download (21.16 MiB)

Version 0.7 for Kerbal Space Program 1.0.5

Released on 2016-03-07

0.7 (2016-03-06) - Fictional update, and Tweaks.

  • Converted ISRO PSLV textures to DDS.

  • Added a nose cone for the 2.8m ISRO PSLV, for converting its lower stages for use as strap-ons.

  • Added ISRO PSLV parts to the custom menu tab, and FilterExtensions tabs.

  • Added Saturn S-IVC, S-IE, & S-IF stage tanks, and second 6.6m nose cone, to enable the fictional Saturn 1C/Multibody (Eyes Turned Skyward).

  • Added Castor 120 solid rocket motor, plus ETS Carrack parts (decouplers, fairings, boattail, nose cone, etc).

  • Added flag decal to Saturn S-IVB tank.

  • Added a simplistic normal-map to the STS (shuttle) ET texture (also used by new fictional Saturn tanks).

  • Added surface attachable monopropellant spheres.

Download (19.64 MiB)

Version 0.6 for Kerbal Space Program 1.0.5

Released on 2016-02-28

0.6 (2016-02-28) - New rocket & Tweaks.

  • Renamed and reorganized some of the ModuleManager patch files.

  • Enabled a multiplier for propellants to bring them back up to the intended mass with RealFuels/RealismOverhaul, for parts that don't get the propellant replaced by those mods.

  • Added a "FOR" statement to the TweakScale MM config.

  • Adjusted Ariane V core stage texture: Broke up the tile pattern somewhat, to look less repetitious.

  • Converted Ariane V textures to DDS.

  • Corrected Ariane V clamshell fairing flag decal to not cast shadows on itself.

  • Added clamshell fairing attachment points to aid in making non-standard rocket configurations:

    • Ariane V core stage, and interstage decoupler.

    • Delta IV CBC, and 5m interstage decoupler.

    • Atlas V didn't make sense to add, since fairings are sized only to the Centaur or to the "boattail".

  • Rotated clamshell fairings 180 degrees, to attach from the left, and use positive ejection charges. Saved crafts will need to be updated.

  • Added ISRO PSLV rocket parts.

Download (18.34 MiB)

Version 0.5.1 for Kerbal Space Program 1.0.5

Released on 2016-02-19

0.5.1 (2016-02-19) - TweakScale Patch.

  • Completely replaced the TweakScale config. Much simpler now, and fixes a variety of problems with scaling.

Download (16.07 MiB)

Version 0.5 for Kerbal Space Program 1.0.5

Released on 2016-02-17

0.5 (2016-02-13) - Alpha Dev.

  • Split out another model component from the Delta IV DCSSs for the thruster platform.

  • Split out models for Atlas Centaur, similar to Delta DCSS, to permit scaling the tank separately from the helium/hydrazine spheres.

  • Moved the DIRECT rocket parts to the experimental (or "massive" in SpaceY) rocketry tech node.

  • Reduced Centaur dry mass to account for adapter mass.

  • Increased Centaur monopropellant to 154 kg (to match reality).

  • Added the STS ET and DIRECT adapters to the TweakScale config.

  • Added Ariane V parts, core stage, second stage, interstage, SRB, Vulcain 2, HM-7B engine, fairings, decouplers, etc.

  • Added Ariane V sample rocket (with dummy payloads).

  • Added VAB transparency to clamshell fairings (when mousing over the bottom end).

  • Fixed VAB transparency on Interstage decouplers.

  • Added some missing TweakScale settings.

  • Added a custom VAB menu tab/category.

  • Added subcategories for FilterExtensions for Ariane and STS/DIRECT (custom icons still needed, and FE support still work in progress).

Download (16.07 MiB)

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