Calculator Inputs
Example Data Table
| Scenario | Mass | Thrusters | Gravity | Efficiency | Result |
|---|---|---|---|---|---|
| Large-grid cargo lifter | 1,000,000 kg | 2 large hydrogen | 1.00 g | 100% | Pass with about 1.47 thrust ratio before margin. |
| Small-grid atmospheric shuttle | 120,000 kg | 4 large atmospheric | 1.00 g | 90% | Close hover. A margin usually needs one more engine. |
| Large-grid moon tug | 300,000 kg | 1 large ion | 0.25 g | 100% | Strong lift for low gravity work. |
Formula Used
Total mass = dry ship mass + cargo mass.
Gravity acceleration = local gravity × 9.81.
Required thrust = total mass × gravity acceleration.
Required thrust with margin = required thrust × (1 + margin ÷ 100).
Effective single thrust = rated thrust × efficiency × cos(angle) × control mode factor.
Total effective thrust = effective single thrust × thruster count.
Required thrusters = ceiling(required thrust with margin ÷ effective single thrust).
Thrust to weight ratio = total effective thrust ÷ required thrust.
Net vertical acceleration = total effective thrust ÷ total mass − gravity acceleration.
Hydrogen burn time = stored hydrogen ÷ total hydrogen use.
How to Use This Calculator
- Enter the dry mass shown in the cockpit information panel.
- Add expected cargo, ore, ice, weapons, or passenger mass.
- Choose grid size, thruster type, and thruster size.
- Enter the number of thrusters facing the lift direction.
- Set gravity, atmosphere efficiency, angle, and safety margin.
- Use custom fields for modded blocks or server changes.
- Press Calculate to review lift, acceleration, demand, and reserves.
- Download CSV or PDF results for design notes.
Advanced Space Engineers Thruster Planning Guide
Why Thruster Planning Matters
A Space Engineers ship feels safe only when thrust exceeds loaded mass. Empty tests can hide failure. Ore, weapons, ice, and passengers add weight fast. A useful calculator therefore starts with dry mass and payload mass. It then compares total force against gravity and chosen safety margin. This gives a clear hover check before launch.
Choosing the Right Thruster
Ion thrusters suit vacuum work. They need power and lose value inside thick air. Atmospheric thrusters are strong near planets, yet fade as air gets thin. Hydrogen thrusters work almost anywhere, but they need tanks, conveyors, ice, and careful fuel planning. A balanced design often uses more than one type. For example, a shuttle may use atmospheric lift near the surface and hydrogen for escape.
Mass, Gravity, and Margin
Gravity is the main enemy during takeoff. The needed upward force equals mass times local acceleration. A one g planet uses about 9.81 meters per second squared. A moon may need far less. Still, margin matters. A ship with exactly enough lift can stall during turns. It can also fail when cargo rises. Many builders target at least twenty percent reserve lift.
Angle and Control Effects
Thrusters do not always point perfectly upward. A tilted engine gives only part of its force to lift. The useful lift is reduced by the cosine of the angle. Manual flight can also behave differently from override calculations. The calculator includes a control mode option, so you can compare full override against normal key thrust. This helps when tuning miners, haulers, fighters, and landers.
Power and Fuel Review
Power demand can limit electric designs. Batteries and reactors must cover the active thrusters plus other systems. Hydrogen craft need enough gas for launch, braking, and reserves. The fuel estimate shows burn time from stored hydrogen. It is not a complete mission planner, but it highlights risky designs early.
Using Results Wisely
Use results as a design guide, not a final guarantee. Mods, damaged blocks, subgrids, scripts, and world settings can change behavior. Test every critical ship in a safe test world. Add landing gear checks, braking thrusters, and sideways control. Good thrust planning makes launches smoother and saves many expensive grids later.
FAQs
1. What mass should I enter?
Use the ship mass shown from a cockpit, control seat, or info screen. Add cargo mass if you expect ore, ice, components, ammunition, or docked subgrids during flight.
2. Why does safety margin matter?
A ship that only barely hovers may fall during turns, cargo loading, damage, or altitude changes. A reserve margin gives better handling and safer braking.
3. How should I set atmospheric efficiency?
Use 100 percent for ideal assumptions. Use lower values for high altitude, thin atmosphere, damaged engines, or cautious estimates on planetary shuttles.
4. What does thruster angle mean?
It is the angle between engine force and the lift direction. A tilted thruster contributes less upward lift because only its vertical force component helps hover.
5. Are hydrogen tanks included in mass?
The calculator does not automatically add tank or fuel mass. Include tanks, ice, cargo, and conveyor parts in dry or cargo mass for better estimates.
6. Why is manual key thrust lower?
The manual option applies a conservative two-thirds factor. It helps compare normal control behavior against full override or dampener output.
7. Can I use modded thrusters?
Yes. Select Custom and enter rated thrust, power demand, and hydrogen use from the mod page or in-game block data.
8. Is this enough for final ship testing?
No calculator replaces practical testing. Use these results for planning, then test the craft with full cargo, braking maneuvers, and real terrain.