How to Build a Gravship in RimWorld Odyssey | Engine to Launch

RimWorld 1.6.4871 · Odyssey · Gravship build path

How to Build a Gravship in RimWorld Odyssey

Instant ladder: get / inspect grav engine → Basic gravtech → Gravship substructure → pilot + tank + thruster → fuel (~10 chemfuel/tile) → launch. Drop a Grav Anchor if you want the map to survive. Gravships have no weight limit — support cells are the ceiling, not cargo mass.

Needs Odyssey Inspect engine unlocks research Base support 500 cells Extenders → up to 2000 Fuel ≈ 10 / tile No mass capacity
01 Engine Scenario ship or Mechanoid Signal crash → inspect
02 Research Basic gravtech + Gravship substructure
03 Hull deck Substructure inside ~19 radius
04 Min kit Pilot + tank + thruster
05 Fuel Chemfuel for range
06 Launch Anchor if keeping map
Launch checklist Size calculator Min parts FAQ
Two ways to get the engine
Scenario: The Gravship

Pick The Gravship and you start with a working ship already on the map. Great if you want Odyssey’s flight fantasy on day one.

  • You still learn the same systems: substructure, fuel, thrusters, and later hull / life support for orbit.
  • Use this page as the rebuild / expand checklist when you outgrow the starter footprint.
Quest: Mechanoid Signal

On normal starts, chase the Mechanoid Signal crash. Salvage the site, then inspect the grav engine.

  • Inspection unlocks Basic gravtech and Gravship substructure.
  • Substructure placement requires an inspected engine — do not skip the inspect click.
  • After that, research and build like any other colony project: panels, steel, and a clean launch kit.
Player tip: if the research tab looks empty for gravtech, you almost always forgot to inspect the engine. The crash quest hands you the relic; inspection hands you the tree.
Interactive min-launch checklist

Tick what you already have. This tool only cares about minimum launch readiness — not fancy interiors or oxygen math.

Readiness ticks

Anchor is optional for launch itself — mandatory only if you care about the leftover colony map.

Live verdict
Substructure size calculator

The engine alone supports 500 cells at radius ≈ 18.9. Each extender adds +250 (radius ≈ 16.9), max 6, must stay within 18.9 of the engine → theoretical 2000 support.

Inputs

Cost estimate uses 1 Gravlite panel + 4 steel per substructure tile. Fuel estimate uses ~10 chemfuel per tile.

Capacity readout
Reminder: this is cell support, not weight. Stuff the ship with granite blocks if you want — the game does not weigh the gravship like a shuttle.
Minimum parts, fuel, and anchor
Controls

Pilot console fills the Controls role. No console, no launch UI that matters.

FuelStorage

Chemfuel tank (250) or Large chemfuel tank (750). Assembly burns about 10 chemfuel per tile.

Thruster

Small thruster or Large thruster. Either satisfies the Thruster requirement for a legal launch.

Piece Role / number Player note
Grav engine 500 support · radius ≈ 18.9 Must be inspected before substructure is legal
Gravship extender +250 each · max 6 · radius ≈ 16.9 · maxDistance 18.9 Park them near the engine; theoretical cap 2000 cells
Gravship substructure 1 Gravlite panel + 4 steel / tile This is your actual “ship floor” currency
Pilot console Controls Required for launch
Chemfuel tanks 250 or 750 storage ~10 chemfuel / tile of travel
Thrusters Small or Large Required for launch
Grav Anchor Keeps local map alive Cannot place on substructure — leave it on ground
Gravship hull isAirtight Orbit walls / sealing; not a launch min-part
Leaving home? Without a Grav Anchor, launching can erase the local map. If you still have a surface colony you care about, place the anchor on ground tiles — never on substructure — before you punch the pilot console.
Practical build order
  1. Inspect the engine (or confirm you started The Gravship). Unlock Basic gravtech and Gravship substructure.
  2. Stock Gravlite panels and steel. Every deck tile eats 1 panel + 4 steel — big footprints get expensive fast.
  3. Lay a compact starter deck inside the engine radius (~19). Do not stretch to the edge until extenders are online.
  4. Drop the launch kit: Pilot console, chemfuel tank, thruster. Keep them reachable and powered as needed.
  5. Fuel for the hop you actually want. Twenty tiles ≈ 200 chemfuel; a 250 tank is a short-hop kit, 750 is a real leg.
  6. Decide map fate. Place Grav Anchor on ground if the colony stays. Skip it if you are abandoning the tile on purpose.
  7. Launch, then expand later with extenders (+250 support each, up to six) when you need barracks, workshops, or sealed orbit rooms.
Layout still matters on a flying base. For traffic and room planning habits that transfer from ground colonies, see optimal colony layout and the best base layout tool.
Orbit survival — deep links only

Once you leave atmosphere, Gravship hull is airtight. You still need a way to live inside vacuum: seal rooms, run Oxygen pumps (150W), and/or kit pawns in vacsuits. This page does not recompute oxygen or vacuum math — those live on the dedicated tools.

Oxygen pump math

Room size, pump count, refill time, airlocks — all on the oxygen tool.

Open oxygen pump tool
Vacuum resistance

Vacsuit loadouts, 100% resistance threshold, gene / apparel mixes.

Open vacuum resistance tool
FAQ — weight, anchor, oxygen, unlock
Is there a gravship weight / mass limit?
No. Odyssey gravships are capped by substructure support cells (500 base, up to 2000 with six extenders), not by cargo mass. The shuttle’s 500 cargo mass limit belongs to a different vehicle — mixing those numbers is how forum threads go sideways.
What does the Grav Anchor actually do?
It keeps the local map from being destroyed when you launch. You cannot place it on Gravship substructure, so park it on ground you intend to leave behind. Skip the anchor only when you are fine abandoning that map tile.
How do I handle oxygen in orbit?
Use airtight Gravship hull, seal the rooms, power Oxygen pumps (150W), and/or run vacsuits. For refill math and vacuum loadouts, jump to rimworld-oxygen-pump-tool and vacuum_resistance_rimworld_tool — this build page only deep-links them.
Scenario ship vs Mechanoid Signal quest?
The Gravship scenario starts you with a ship. Other starts use the Mechanoid Signal crash quest: recover the engine, inspect it, unlock Basic gravtech + Gravship substructure, then build the launch kit yourself.
How big can I go with extenders?
Engine = 500. Each extender = +250, max 6, placed within 18.9 of the engine, each covering ~16.9 radius. Theoretical ceiling = 2000 support cells. Stay inside those radii or “free” tiles will refuse to count.
How much chemfuel do I need?
Budget about 10 chemfuel per tile of travel (BaseFuelPerTile). A 250 tank is a short hop; a 750 tank is a longer leg. Use the size calculator above to sanity-check tank vs planned distance.