SpaceY Heavy Lifters (SYL) by NecroBones CKAN

Adds 5m rocket parts, plus a variety of related parts and 3.75m items to fill in gaps.

License: CC-BY-NC-SA 4.0

Game Version: 1.12.4

Downloads: 360,910

Mod Website: Forum Thread

Support this mod: Donate

Followers: 522

Outdated Mod

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

Information Changelog Stats

SpaceY Lifters (SYL) KSP version License
Curseforge GitHub SpaceDock CKAN

SpaceY Lifters (SYL)

Parts for large lifting rockets, 5m rocket parts and large SRBs, and matching decouplers for Kerbal Space Program.

By zer0Kerbal, originally by NecroBones

adopted with express permission and brought to you by KerbSimpleCo

SpaceYLifters Hero

Sample images

Forward by NecroBones

SpaceY Lifters is a parts pack that is intended to extend the stock line-up of parts for lifting heavy payloads to orbit, by providing a similar update to the NASA/ARM pack from 0.23.5, in the next size up.

It provides a range of 5m fuel tanks and engines, a fueled 3.75m nose-cone, both "stack" and "radial" decouplers, a fueled size adapter, and a range of powerful SRBs.

The name is a play on "SpaceX" in the real world, but also has the amusing double connotations of being "spacey", and also "Space, why?" -- Because it's there!

All of the models and textures were made 100% from scratch, using Blender, Photoshop, and Unity.

Part of the NecroBones suite of mods, that work nicely together!

Design Goals

  • Maintain a "pretty", but still mostly stock-alike appearance. While KW goes a long way toward realism, we want to have a smaller pack that blends nicely with stock, and other stock-alike packs.
  • While extending the stock game, try to maintain a gameplay balance with stock.
  • And do so while adding:
  • Another layer of large rocketry, beyond the 3.75m ARM/NASA update that was added in KSP 0.23.5. Specifically, 5m parts.
  • Large SRB options with high thrust and shorter burn times than the NASA/ARM SRB.
  • Large rocketry utilities-- Big radial decouplers with thrusters built in, larger sepratron, etc.

  • Contains several unusual or unique features, including some "firsts":

  • Engines with multiple sized fairings, or with conical fairings.
  • Engine clusters with mode-switching for activating/deactivating nozzle groups.
  • Rocket-assisted radial decouplers.
  • Stack size adapters with multiple target diameters (adaptive shrouds).
  • Docking ports with guide-lights.
  • Fuel tanks with automatic shrouds.
  • Thrust plates and adapters with fairings.
  • "Petal" cargo bay.

See more

YouTube review by Kottabos Gaming

KSP Mods - SpaceY Heavy Lifter

Help Wanted

  • Compatibility patches
  • Contracts for these glorious parts
  • Variant Textures
  • Converting from FireSpitter to Stock and/or KSPWheel
  • Model updates to Unity 2019
  • Marketing Images and Videos such as hero shots, animated gifs, short highlights
  • Have a request? Glad to have them, kindly submit through GitHub.


  • English English
  • your translation here

HELP WANTED - See the README in the Localization folder or the Quickstart Guide for instructions for adding or improving translations. GitHub push is the best way to contribute. Additions and corrections welcome!

Installation Directions [^1]

Use CurseForge/OverWolf App (currently does not install dependencies)

CurseForge/OverWolf App

I take no part, nor am I interested in maintaining the CKAN mod metadata for my mods. CKAN is a great mod for those that can't use zip tools. If you are having issues please let the CKAN people know and refer to the CKAN thread. My support of CKAN extends as far as me checking the checkbox in Spacedock when I upload. Beware, CKAN can really mess up though it tries very, very, very hard not to.



Recommends Other SpaceY Corp (SYC) mods



parts, config

red box below is a link to forum post on how to get support

How to get support

Be Kind: Lithobrake, not jakebrake! Keep your Module Manager up to date

Credits and Special Thanks

Legal Mumbo Jumbo (License provenance)

Current (1) - zer0Kerbal

Forum: Thread - Source: GitHub
License: License License


All bundled mods are distributed under their own licenses
All assets, including but not limited to: animations, models, sounds and textures are distributed under their own licenses

see for more legal Mumbo Jumbo

Original (0) - Author: NecroBones

Forum: Thread - Download: CurseForge - Source: CurseForge
License: License License


How to support this and other great mods by zer0Kerbal

Completely voluntary, absolutely amazing, and really does help me out a lot! quote from cybutek cybutek creator of Kerbal Engineer

Support Github Sponsor Patreon Buy zer0Kerbal a snack

and it is true.

Connect with me

Track progress: issues here and projects here along with The Short List

zer0Kerbal | zer0Kerbal | CurseForge zer0Kerbal | reddit zer0Kerbal | Patreon zer0Kerbal | YouTube zer0Kerbal | Twitch zer0Kerbal | PayPal zer0Kerbal | Buy Me a Coffee zer0Kerbal | Twitter

Release Schedule
  1. GitHub, reaching first manual installers and users of KSP-AVC. Right now.
  2. CurseForge. Right now.
  3. SpaceDock (and CKAN users). Soon™

[^1]: this isn't a mod. ;P
[^2]: may work on other versions (YMMV)
[^3]: Be Kind: Lithobrake, not jakebrake! Keep your Module Manager up to date!

Version for Kerbal Space Program 1.12.4

Released on 2023-01-18


| modName | SpaceY Lifters (SYL) | | ---------- | ----------------------------------------------------------------- | | license | CC-BY-NC-SA-4.0 | | author | NecroBones(Orvidius) and zer0Kerbal | | forum | (*/) | | github | ( | | curseforge | ( | | spacedock | ( | | ckan | SpaceY-Lifters |

Version - <Thank you NecroBones>

  • Released
  • on 10 Dec 2022
  • for KSP 1.12.4
  • by zer0Kerbal

Adoption by zer0Kerbal


  • Adoption by zer0Kerbal
  • This is the first in a series of updates to this addon. Each update will update some of the parts and patches so that instead of one massive update I can update the addon in a more manageable way.
  • Phase I (initial) pass
  • parts pass started
  • <ghostparts.cfg> is provided for testing. This file will not be active for v2.0.0.0-release.
  • Can now search for syl or spacey in the editor search bar to find all parts in this pack.
  • Only updated parts are included
  • Parts updated (and included in this (pre)release)
  • Docking
    • syl-docking3m
    • syl-docking5m>
    • syl-docking7m>
  • Control
    • syl-sasR3m
    • syl-sasR5m
  • Command
    • syl-probe5m
    • syl-probe3m
  • CargoBays
    • syl-bay3m2m
    • syl-bay5m3m

Previous Releases (Archive)

  • Create
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • <Archival>
  • closes #46 - Archival Releases


  • Add
  • <ghostParts.cfg> v1.3.0.0
  • Rename
  • parts to match naming scheme
    • replace SY with syl-
  • part files to match part names
  • Fix
  • Lint
  • Reformat
  • moved to SpaceY Corp
  • Agency
  • Flags
  • <themes.cfg> v2.0.0.0
  • Errors
  • Parts
    • Structural
    • <SYadapter5x4/part.cfg>
    • SRBs
    • <SYSRB_Radial/SYSRBradial01.cfg>
      • missing //
    • <SYSRB_0625/SYSRB_0625L9.cfg>
      • =1.4.5 replace scale with localScale

    • <SYSRB_0625/SYSRB_0625L6R.cfg>
      • =1.4.5 replace scale with localScale

    • <SYSRB_0625/SYSRB_0625L5.cfg>
      • =1.4.5 replace scale with localScale

  • Patches
    • <SpaceY-DeadlyReentry.cfg>
    • missing MODULE
    • <SpaceY_HotRockets.cfg>
    • <SpaceY_HeatAnimation.cfg>
    • <SpaceY_ATM.cfg>
    • deactivated (no longer needed)
    • <SpaceY_ColorChange5m.cfg>
    • missing = after [displayName]
    • <SpaceY_HotRockets.cfg>
    • missing multiple (9) brace sets {}
  • closes #70 - [BUG]{Archived releases} Errors corrected


  • create Assets/ folder
  • convert
  • from mesh to MODEL
  • rename
  • Rename model files to unique names
  • textures to unique names
  • update
  • model pointers (.png et al to .dds)
  • model texture pointers to new names
  • relocate assets to Assets/
  • eliminate
  • remove duplicates textures/models
  • relocate part.cfg to Parts/
  • convert to .ogg
  • <srb_loop.wav> 1.507mb --> 116kb
  • <sls_loop_blend.wav> 1.507mb --> 499kb
  • <sls_loop_deep.wav> 1.507mb --> 319kb
  • <sls_loop_high.wav> 428kb --> 386kb
  • <sls_start.wav> 316kb --> 99kb
  • <srb_heavy_loop.wav> 316kb --> 126kb
  • 5.44mb --> 1.5mb
  • updates #48 - Part Asset Updates



  • Create
  • Localization/
  • Create
  • [SpaceYLifters.cfg] v1.0.1.0
    • adds localized tags to parts
    • fix inadvertant passengers
  • closes #47 - Create Localization directory and contents
  • closes #49 - Create <SpaceYLifters.cfg>
  • updates #50 - Localization - Master
  • updates #51 - English <us-en.cfg>
  • updates #68 - Part Localization

Cover image

  • closes #45 - Create HeroLogo.png


  • Issues
  • closes #40 - SpaceYLifters (SYL) <Thank you NecroBones> edition
  • closes #41 - Create Legal Mumbo Jumbo
  • closes #42 - Create Documentation
  • closes #43 - Create Social Media Presence

Download (3.07 MiB)

Version 1.17.2 for Kerbal Space Program 1.9.1

Released on 2018-04-02

1.17.2 (2018-04-02) - Re-upload.

1.17.1 (2018-04-02) - KSP 1.4 update. - Corrected a copy/paste mistake in color-changing config.

Download (25.46 MiB)

Version 1.17 for Kerbal Space Program 1.4.1

Released on 2018-04-02

1.17 (2018-04-02) - KSP 1.4 update.

  • Reworked color-changing to use KSP 1.4's mesh switcher.

  • Flag decals disabled for now, since the stock mesh switcher doesn't play nicely with them.

  • Disabled auto-caps on tanks, due to KSP bugs over several versions.

  • Changed ModularFuelTanks config to use consolidated wildcard patch.

  • Added some wildcards to TweakScale config.

Download (25.46 MiB)

Version 1.16 for Kerbal Space Program 1.4.1

Released on 2017-01-30

1.16 (2017-01-30) - SRB Update.

  • Corrected smoke emitter location on the 3.75m SRB, 21m length.

  • Added a 30m long 3.75m SRB.

  • Added a 29m long 2.5m SRB.

Download (25.46 MiB)

Version 1.15.1 for Kerbal Space Program 1.2.2

Released on 2017-01-03

1.15.1 (2017-01-03) - Compatibility Update.

  • Added "NEEDS" conditionals for ConnectedLivingSpace and EngineIgnitor patches, to clean up log spam.

  • EngineIgnitor patches moved to their own file in the patches folder.

  • Added "NEEDS" conditionals for Engineering Tech Tree compatibility.

Download (25.04 MiB)

Version 1.15 for Kerbal Space Program 1.2.2

Released on 2016-10-21

1.15 (2016-10-21) - Update.

  • Added new RCS sounds/effects.

  • Added a linear RCS thruster.

  • Updated OMS engines to use new RCS sounds and effects.

  • Added two adapters that can be used with the Rose/Rosette adapter center slots.

  • Updated custom part category with recent additions from here and SpaceY Expanded.

  • Added some missing search tags on thrust plates / adapters.

Download (25.04 MiB)

Version 1.14 for Kerbal Space Program 1.2

Released on 2016-10-12

1.14 (2016-10-12) - More KSP 1.2 Compatibility & Fixes.

  • Landing legs should now work in the Landing Gear action group automatically again.

  • 5m Fairing base null reference exception corrected, and is available again.

  • Names adjusted on some thrust plates / adapters.

  • Version changed to 1.14 to make it more clear this is a significant 1.2 update.

Download (24.92 MiB)

Version 1.13.1 for Kerbal Space Program 1.1.3

Released on 2016-08-01

1.13.1 (2016-08-01) - Tweaks.

  • Icon-only shroud added to fairing base, for easy identification in menu.

  • 5m conical bay added to custom parts tab.

  • Added MM "NEEDS" conditionals to RemoteTech modules in probe cores, and moved to separate patch file.

  • Deadly Reentry patch file renamed to sort properly in the folder.

  • Added a compatibility exclusion for HPTechTree.

Download (24.91 MiB)

Version 1.13 for Kerbal Space Program 1.1.3

Released on 2016-06-08

1.13 (2016-06-08) - Update.

  • Adapters and Thrust Plates marked as passable for Connected Living Space so that they can be used for station construction, and docking ports, etc.

  • Added 5m/3.75m conical payload bay.

  • Adjusted the "hide if empty" rules for the tech nodes.

Download (24.62 MiB)

Version 1.12.9 for Kerbal Space Program 1.1.2

Released on 2016-05-31

1.12.9 (2016-05-31) - Hotfix.

  • Massive Rocketry/Structure tech nodes are now set to be hidden if empty.

  • Fixed a harmless mistake in the MM patches, as part of its self cleanup.

Download (24.60 MiB)

Version 1.12.8 for Kerbal Space Program 1.1.2

Released on 2016-05-31

1.12.8 (2016-05-31) - Tweaks.

  • Adjusted some nickname tags on engines.

  • Minor tech tree and config changes in MM patches. Partly for better compatibility with Real Scale Boosters.

  • Non-CTT tech nodes are now added, even if CommunityTechTree is installed.

  • Gigantic Rocketry node internally renamed to match CTT. May have to re-unlock if you don't use CTT.

Download (24.60 MiB)

Version 1.12.7 for Kerbal Space Program 1.1.2

Released on 2016-05-18

1.12.7 (2016-05-18) - Tweaks.

  • Added configs for docking ports to use IndicatorLights, if installed.

  • Reworked docking alignment lights to be slightly prettier when turned off, or dim, etc.

Download (24.60 MiB)

Version 1.12.6 for Kerbal Space Program 1.1.2

Released on 2016-05-13

1.12.6 (2016-05-12) - Tweaks.

  • Restricted liquid fuel engines, fairings, and decouplers to non-surface part testing contracts, to match SRBs.

  • Changed underlying texture for Docking port alignment lights, for compatibility with IndicatorLights.

  • Converted small lighting textures for docking ports to DDS format.

Download (24.60 MiB)

Version 1.12.5 for Kerbal Space Program 1.1.2

Released on 2016-05-08

1.12.5 (2016-05-08) - Tweaks.

  • Refined the primary launch clamp's internal layout, to use as a template for later projects.

  • Added basic thrust curves for SRBs. Flat profile, however thrust tapers off during last 5% of remaining propellant.

Download (24.59 MiB)

Version 1.12.4 for Kerbal Space Program 1.1.2

Released on 2016-05-01

1.12.4 (2016-05-01) - Tweaks.

  • Corrected AVC version number. DOH!

1.12.3 (2016-05-01) - Tweaks.

  • Updated Probe cores and reaction wheels to use IndicatorLights if available.

  • Probe cores now also have a toggle option for light-up labels that correspond to the indicator lights.

  • Corrected a missing texture placeholder for the 3.75m stack separator.

Download (24.54 MiB)

Version 1.12.2 for Kerbal Space Program 1.1.2

Released on 2016-04-25

1.12.2 (2016-04-25) - Tweaks.

  • More search keywords on engines.

  • Added colliders setting for procedural fairing base.

  • Updated heat shield's staging settings to match stock changes in 1.1.

  • Fixed the "always transparent" problem in the VAB for the service/cargo bays.

  • Tech Tree nodes are no longer hidden if empty.

  • Corrected some copy/paste mistakes with SmokeScreen rescaling settings for the small SRB particle emitters.

Download (24.48 MiB)

Version 1.12.1 for Kerbal Space Program 1.1

Released on 2016-04-17

1.12.1 (2016-04-17) - Tweaks.

  • Tweaked leg settings.

  • Moved a leg collider to allow for more accurate aerodynamic occlusion.

Download (24.51 MiB)

Version 1.12 for Kerbal Space Program 1.1

Released on 2016-04-10

1.12 (2016-04-10) - Tweaks.

  • Added 1.25m-0.625m interstage thrust plate to the TweakScale config, and default VAB custom tab.

  • Drastically reduced career prices for fuel tanks, to bring them into line with stock again.

  • Increased career prices for engines, to bring them into line with stock again.

  • Added a 2.5m thrust plate, with 1x 1.25m and 8x 0.625m nodes (half scale version of the 5m model).

  • Adjusted leg deployment animation to reduce the "foot teleportation" problem.

  • Increased damper ratio on the leg suspension.

Download (24.51 MiB)

Version 1.11.5 for Kerbal Space Program 1.1

Released on 2016-04-05

1.11.5 (2016-04-05) - Tweaks.

  • Moved conical payload bay to Specialized Construction tech node.

  • Added a 1.25m-0.625m interstage thrust plate.

  • Softened leg suspension spring.

Download (24.51 MiB)

Version 1.11.4 for Kerbal Space Program 1.1

Released on 2016-03-31

1.11.4 (2016-03-31) - KSP 1.1 Hotfix

  • Landing leg suspension works again. Suspension is very stiff to help prevent heavy vehicles from bobbing endlessly.

Download (24.47 MiB)

Version 1.11.3 for Kerbal Space Program 1.1

Released on 2016-03-30

1.11.3 (2016-03-29) - KSP 1.1 Hotfix

  • Landing legs updated to not be 100% deadly. Suspension still doesn't work, legs are rigid for now.

  • Added menu search tags.

Download (24.45 MiB)

Version 1.11.2 for Kerbal Space Program 1.0.5

Released on 2016-03-18

1.11.2 (2016-03-18) - HotFix.

  • Removed duplicate "MODCAT" entry for the SpaceY Expanded custom menu tab.

Download (24.47 MiB)

Version 1.11.1 for Kerbal Space Program 1.0.5

Released on 2016-03-11

1.11.1 (2016-03-11) - Tweaks.

  • Added/enhanced custom category tab for FilterExtensions (will also include SpaceY Expanded, if installed).

Download (24.47 MiB)

Version 1.11 for Kerbal Space Program 1.0.5

Released on 2016-02-29

1.11 (2016-02-28) - Tweaks.

  • Adjusted the MM rule for DefaultActionGroups to tweak the descriptions in the radial reaction wheels.

  • Added 5m color-changing to the R7 engine cluster.

  • Corrected the missing blue texture from the 3.75m tall 5m tank.

Download (24.46 MiB)

Version 1.10 for Kerbal Space Program 1.0.5

Released on 2016-02-19

1.10 (2016-02-19) - The unintentionally quick update.

  • SRB 10R (radial) gimbal range reduced to 2 degrees (from 4).

  • Base (dry) cost of most SRBs (other than 3.75m models) increased slightly to align more with stock.

  • Moved ModuleManager patches to a "Patches" folder.

  • Added support for DefaultActionGroups mod, to automatically enable the SAS light on the radial reaction wheels.

  • Added color switching for 5m decoupler and separator, to match 5m tanks.

Download (24.08 MiB)

Version 1.9 for Kerbal Space Program 1.0.5

Released on 2016-02-18

1.9 (2016-02-18) - Paint!

  • Added additional striped paint scheme to 5m tanks.

  • Switched the Color-Changing config to turn off alternate paint schemes via a slightly simpler method.

Download (23.99 MiB)

Version 1.8.2 for Kerbal Space Program 1.0.5

Released on 2016-02-17

1.8.2 (2016-01-14) - Tweaks.

  • Consolidating tech tree for better mod compatibility:

    • Added SpaceY Expanded's tech tree nodes.

    • Added a hidden Colossal Rocketry node for future use (and for other mods if they want).

  • Removed TweakScale "adapter_3_1" definition since it's redundant with default TS configs now.

Download (23.96 MiB)

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