Calculator Inputs
Example Data Table
Use this table to test common planning cases. Replace values with your own ship data.
| Build Type | Total Mass | Mode | Gravity | Desired Accel. | Thrust Per Engine | Engines | Safety |
|---|---|---|---|---|---|---|---|
| Light miner | 18,000 kg | Vertical climb | 9.81 m/s² | 2.00 m/s² | 450 kN | 6 | 20% |
| Cargo hauler | 80,000 kg | Hover hold | 9.81 m/s² | 0.00 m/s² | 1,200 kN | 10 | 30% |
| Combat craft | 42,000 kg | Braking burn | 0.00 m/s² | Speed based | 900 kN | 8 | 35% |
| Large shuttle | 150,000 kg | Vertical climb | 9.81 m/s² | 1.80 m/s² | 2,500 kN | 12 | 25% |
Formula Used
Total mass: dry mass + cargo mass + fuel mass
Vertical climb thrust: mass × (gravity + desired acceleration)
Hover thrust: mass × gravity
Horizontal thrust: mass × desired acceleration
Braking thrust: mass × (target speed ÷ stop time)
Required thrust with safety: base required thrust × (1 + safety margin ÷ 100)
Effective engine thrust: rated engine thrust × efficiency × environment factor
Engines needed: ceiling(required thrust ÷ effective engine thrust)
Thrust ratio: available thrust ÷ required thrust with safety
Burn time: fuel capacity ÷ estimated fuel use per minute
How to Use This Calculator
- Enter the dry mass of your ship.
- Add cargo and fuel mass for a loaded flight test.
- Select the maneuver you want to calculate.
- Enter local gravity and desired acceleration.
- Add thrust per engine and installed engine count.
- Adjust efficiency and environment factors if needed.
- Set a safety margin for heavy cargo or rough control.
- Press the calculate button and review the result above the form.
- Use the chart to compare thrust demand against mass growth.
- Download the CSV or PDF file for build notes.
Engineering Notes for Ship Thrust Planning
Why Thrust Margin Matters
A Space Engineers ship can look strong while empty. It may fail when loaded. Cargo changes everything. Ore, ice, ammunition, and components add mass fast. This is why thrust should be planned with a reserve. A small reserve may lift the ship. A larger reserve gives control during turns, landing, and emergency climbs.
Mass Comes First
The best thrust estimate starts with total mass. Include the hull. Include cargo. Include fuel stores too. Many designs fail because only dry mass was considered. A hauler should be tested at its heaviest planned load. A miner should be tested after a full mining run. Combat craft should include ammunition and spare supplies.
Gravity Changes the Result
Vertical thrust must beat gravity before it can accelerate upward. Hovering needs thrust equal to ship weight. Climbing needs more. Horizontal flight is different. It mainly depends on the acceleration target. Braking depends on speed and stopping time. This calculator separates those cases so each design choice is clearer.
Efficiency and Environment
Thrusters may not always perform at perfect output. Damage, atmosphere, server settings, mods, and layout limits can reduce useful thrust. The efficiency field allows a practical correction. The environment factor gives another correction. Use conservative values when the ship must survive heavy work.
Reading the Output
The thrust ratio is the main signal. A value below one means the tested direction is underpowered. A value near one is risky. A stronger ratio gives safer handling. The engine count result shows how many thrusters are needed. The margin shows how much extra thrust remains after safety is included.
Fuel Planning
Fuel burn is an estimate. It depends on throttle, installed engines, and the rate entered by the user. Use it as a planning guide. Always test final builds in game. Keep reserve fuel for landing, braking, and unexpected cargo changes.
FAQs
1. What does this thrust calculator measure?
It estimates required thrust, available thrust, engine count, acceleration, safety margin, and fuel burn for Space Engineers ship planning.
2. Should I use dry mass or loaded mass?
Use loaded mass for safer results. Add cargo, fuel, ice, ammunition, and expected inventory weight before calculating thrust.
3. What is a good thrust ratio?
A ratio above one can work, but it may feel weak. For safer handling, target a stronger margin, especially for cargo ships.
4. Why is vertical climb harder than horizontal motion?
Vertical climb must overcome gravity first. Only extra thrust after that produces upward acceleration. Horizontal motion does not include lift demand.
5. What does environment factor mean?
It adjusts useful thrust for atmosphere, mods, server settings, or design limits. Use 100 for normal rated output.
6. How does braking mode work?
Braking mode divides target speed by stopping time. The result becomes required deceleration, then mass converts it into thrust demand.
7. Why add a safety margin?
A margin helps cover cargo changes, control loss, damaged engines, uneven thrust placement, and rough landing conditions.
8. Are fuel results exact?
No. Fuel output is an estimate based on your entered rate and calculated throttle. Test final builds under real game conditions.