Ostranauts Fusion Torch Drive Build Guide

Interplanetary income in Ostranauts eventually demands more than RCS puffing around OKLG. Blue Bottle Games implements an Inertial Confinement Fusion Torch Drive — a reactor that generates power and, when vented, high-impulse thrust for long burns. The 1.0 Steam release (2026-08-03) assumes single-player captains respect no-wake zones, fuel logistics, and the difference between contained reaction and open cycle thrust.

This build guide covers reactor components, installation footprint, startup checklist, nav console autopilot plotting, towing brace fitment, and ship flipping economics. Watch the embedded walkthrough for brace placement on cramped airlocks, and read Nav Console before your first plotted course.

Why fusion torch is an endgame build

RCS and chemical tugs suffice for inner boneyard hops — see How to Fly and Dock. Torch drives unlock:

• Fast transit to outer markers and Ceres-adjacent zones on the Map hub
• Profitable cargo routes that amortize He3 burn against broker flip margins
• Towing derelicts from distant orbits before they drift into gravity wells

Costs include:

• Large 13×7 minimum reactor footprint plus fuel tank farms
• He3 consumption far exceeding D2O — community ratios cite roughly 1 D2O tank to 3–13 He3 tanks depending on range
• Ablative Core Liner wear, radiation leaks, and catastrophic nova risk if overheated
• Legal wake restrictions near stations — torch plumes trigger fines and hull damage

Budget shift payments in Ship Mortgage before importing expensive reactor parts; use the mortgage shift planner when planning multi-shift construction.

Ship flipping and towing brace

Reactor components and layout

The Sulaiman ICFR Core anchors the build — a multi-part assembly with twelve feed ports for peripherals. Minimum practical set:

• Fusion Field Coils Assembly (two-part ring on a 5×5 floor cutout — center tile removed for vacuum)
• Reactor Core Assembly (four quarters over coils)
• Pellet Feeder + Reactor Fuel Regulator
• Laser Array + Fusion-Grade Laser Capacitor (pair counts must match)
• D2O and He3 canister tanks with frame clearance
• Ship battery with startup headroom

Optional but recommended:

• Core Pump for rapid vacuum prep in atmosphere
• MHD Generator to recharge batteries from plasma diversion
• Cryo Distribution Pump + Cryo Reservoir for temperature regulation

Challenge: route feed ports without overlapping placeholders — use Install ghosts before cutting floors. Ship Building covers conduit paths and airtight discipline.

Building the reactor step by step

1. Mark a 5×5 coil pad; remove center floor for vacuum access
2. Install both Field Coil halves — this is the geometric anchor
3. Drop four Core Assembly quarters aligned over coils; leave control terminal reachable
4. Attach pellet feeder, regulator, laser array, capacitor on feed ports — experiment with compact layouts
5. Place filled D2O and He3 tanks with required two-tile frame rings; keep four-tile spacing between wide canisters
6. Wire battery and optional MHD; add cryo loop before first ignition
7. Run startup from reactor panel or nav console interlock

Skipping cryo on closed-cycle power runs risks heat creep, inefficient fuel burn, ACL damage, and explosion. Open-cycle thrust venting dumps heat — normal for burns, fatal if misconfigured on dock.

Startup checklist (abbreviated)

From the approved operations sequence:

1. PWR BUS to BATT — verify lamp test and capacitor charge
2. Confirm He3 (> ~6.6 kg recommended) and D2O (> ~4.45 kg) readouts
3. CORE PURGE or CYCLE OPEN until CORE PRESSURE reads VAC
4. Enable LAS ALIGN, PEL FEED, CRYO as equipment allows
5. THRUST ACTIVE SAFETY OFF, FLOW MINIMUM, CYCLE CLOSED
6. Sequence FUEL REG, FWD, REAR on field coils
7. RATIO MHD ON if generator present; IGNITION ON

For battery charging, set MHD ON and PWR BUS CHRG. For thrust, arm THRUST ACTIVE SAFETY only when clear of wake zones and dock clamps released.

Full lamp semantics live on the official fusion wiki; this guide emphasizes gameplay gates: never ignite surrounded by OKLG traffic.

Nav console torch piloting

Switch to long-range controls on the Nav Console:

• Pause before plotting — engaging off-node fails
• Verify not inside NO WAKE ZONE
• Open THRUST CYCLE safety cover; set THRUST CYCLE Active
• Select target; QUICK ZOOM; PLOT COURSE
• Review DURATION, TORCH REACTANT USED, RCS REMASS USED, MAX ACCEL
• Tune DRIFT PHASE and ACCEL. LIMIT (thrust limiter caps near 1.95g)
• Fast-forward map preview to confirm no collision intercepts
• ENGAGE COURSE at x1 speed, then unpause

Manual torch uses CYCLE (closed = power, open = thrust plume) and FLOW slider. Temperature dropping under thrust is normal until heat ejection exceeds generation — reduce ACCEL. LIMIT or add laser/feeder pairs if reaction collapses.

Wake zones and legal flight

Stations publish no-wake volumes where torch plumes damage traffic and trigger law response. RCS-only inside those bounds — even if you are late on Ship Mortgage shift payments. Plan clamp release, clear volume under RCS, then arm thrust beyond the marker.

Police vessels already respond to dark transponder flight; wake violations compound fines that steal flip profits.

Towing brace: moving wrecks without disintegration

The Ryokka T7N Towing Brace couples to Bieler airlock rings, letting you translate while docked to a derelict without torsion damage. Without brace secured, even modest RCS boosts shred both hulls — community reports half structural HP gone on walls after one careless nudge.

Installation pain points:

• Brace consumes ~100 W when enabled — shipbreakers who forget pay in power
• Requires wall removal adjacent to airlock conduit tiles while maintaining airtightness — the brace itself is a wall segment
• Two conduit feed tiles often sit two tiles aft of the inner door; red placement tint lies
• Clamp disengage locks while brace is secured — sequence unspool animations before undock

Salvage braces from derelict exteriors when possible; buying fresh is broker-dependent. The video Ship flipping and towing brace demonstrates real fitment on a flip project.

Ship flipping workflow

Ship flipping — buy undervalued derelict, repair, upgrade, sell at broker — peaked after broker kiosks and rating systems expanded. Macro loop:

1. Purchase derelict from OKLG Commercial broker; preview before final sale
2. Stabilize orbit with RCS if purchased hulk drifts — target VREL near zero relative to anchor body
3. Install towing brace; dock to wreck; spool brace cables
4. Tow toward OKLG or stable holding point
5. Restore power, atmosphere, and rating components (Manage Atmosphere, Orders REPR)
6. Optional: mount fusion torch for repositioning burns
7. Sell at broker when rating peaks — distance to market affects payout on some contracts

Flip specialists keep a dedicated cargo tug and a residence on OKLG for storage overflow — flip profits fund He3 stockpiles.

Fuel logistics and mid-route refuel

He3 burns faster than D2O; long routes need multi-tank farms or planned refuel kiosk stops. Refuel kiosks replenish canisters, RCS gas, and ship batteries when configured — align intakes before shift end if mortgage payments loom.

Micrometeorite strikes far from OKLG demand patch kits and spare Ripley blister walls — stock before first interplanetary commit.

Failure modes and troubleshooting

Symptom	Likely cause
Reactor shuts down mid-burn	Heat ejection exceeds generation — lower accel or add feeder/laser pairs
Cannot engage course	Off plot start, wake zone, or safety interlock
Radiation crew deaths	ACL depleted — replace liner at kiosk, reactor off
Tow hull damage	Brace not secured or clamps released early
Nova	Overheat + ignored cryo — evacuate compartment

Build progression checklist

1. Master RCS dock in How to Fly and Dock
2. Stabilize mortgage in Ship Mortgage
3. Salvage brace and reactor parts via How to Salvage
4. Cut reactor bay on a hull with broker resale value
5. Test short plotted burn in empty volume
6. Combine brace + torch for flip pipeline

Related pages

• Builds hub — career and mortgage context
• Nav Console — COMMS, clamps, plotting
• Starter Careers — who should rush torch
• salvage economy — flip margins
• Tools hub — shift and atmosphere checklists before long burns