Mercedes Mullins
Staging fuel tanks in Kerbal Space Program is a crucial aspect of efficient space travel. The game offers various fuel types, including solid fuel boosters and liquid fuel engines, each with unique characteristics and compatibility requirements. Proper staging involves understanding the concept of fuel lines, which always flow in one direction, and utilizing techniques such as onion staging or asparagus staging to maximize fuel efficiency and engine performance. The order in which fuel tanks are emptied and dropped significantly impacts the rocket's overall performance and ability to reach orbit. Additionally, players can adjust settings like Flow Priority to control the sequence of tank drainage. Mastering fuel tank staging is essential for successful space missions in Kerbal Space Program.
| Characteristics | Values |
|---|---|
| Fuel tank characteristics | The Rockomax X200-16 Fuel Tank has a height of 1.84 meters and a radius of 1.25 meters. The volume is 9032.1 litres. |
| Fuel types | There are four types of fuel mixtures: liquid fuel and oxidizer (9:11 ratio), liquid fuel alone, monopropellant, and ore. |
| Fuel tank usage | Fuel tanks are used to contain and provide fuel to engines or consumers. |
| Staging fuel tanks | "Onion staging" and "asparagus staging" are techniques to maximize fuel efficiency by using fuel lines and dropping empty tanks. |
| Fuel flow | Fuel lines have a direction, and engines pull fuel from the farthest fuel tank. Advanced tweakables allow setting fuel flow priority across tanks. |
| Solid vs. liquid fuel | Solid boosters use solid fuel, while normal engines use an oxidizer/liquid fuel mix. Crossfeed couplers can be used to direct fuel flow. |
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What You'll Learn
Use the onion staging technique to maximise fuel/engine power/mass
In Kerbal Space Program, "onion staging" is a concept that can be used to maximise fuel, engine power, and mass. This is achieved by setting up fuel lines in a specific way.
In onion staging, you have a second layer of fuel tanks upon the first, creating a larger rocket. This is in contrast to asparagus staging, where you shed external tanks as they drain, reducing mass as soon as the tank is empty. In onion staging, you draw fuel from all boosters simultaneously and discard them once they are depleted, whereas asparagus staging uses and discards tanks two at a time.
Onion staging is more powerful and quicker to set up than asparagus staging, and it gets you into orbit faster, albeit at the cost of some fuel. It is also easier to execute, with fewer overall stages, making it less prone to errors. However, it can make the rocket unstable, requiring additional struts and structural parts to stabilise it.
Here's an example of how to set up onion staging:
- Draw a 3x3 grid and number the blocks 1-9, from top left to bottom right.
- Imagine these blocks are liquid fuel tanks with engines underneath.
- Attach all but block 5 (the centre block) to block 5 with radial decouplers. Attach your payload to block 5.
- Connect the fuel lines as follows: 1->2->3->6->5 and 9->8->7->4->5.
- Set up staging: fire all the engines in the first stage, then proceed to the next stage.
By following these steps and understanding the principles of onion staging, you can maximise fuel efficiency, engine power, and mass in your Kerbal Space Program rockets.
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Asparagus staging involves attaching outer fuel tanks to the closest inner tank
In Kerbal Space Program, asparagus staging is a method of improving rocket efficiency. It involves grouping external tanks together so that they feed fuel into the main tank, allowing you to get rid of the mass of the external tanks and have a full fuel tank when you need it.
Asparagus staging works by attaching outer fuel tanks to the closest inner tank using fuel lines. For example, in a three-stage launcher, the outermost tanks (stage 1) are attached by fuel lines to the second stage's fuel tanks. These are then attached to the innermost tanks (stage 3) by fuel lines. At launch, all the stage engines are fired, and as the fuel tanks run out, the stages are detached, leaving full fuel tanks at each new stage.
This setup saves fuel in the inner tanks and helps lower mass quickly, increasing the thrust-to-weight ratio (TWR) for that particular stage. By jettisoning the outer tanks and engines, you cast off dead weight, increasing the TWR in that stage and transferring the remaining fuel to the next set of tanks. This process repeats, making the craft lighter and keeping only the necessary parts.
It is important to note that asparagus staging is impractical in reality due to the maximum flow rate and the amount of mass movement, which would cause a rocket to spin. It is also inefficient due to the wide structure of rockets designed in this way, which causes drag. However, it can be a useful method for getting rockets into orbit in Kerbal Space Program, where fuel flow does not have any momentum.
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Enable Advanced Tweakables to set fuel direction and priority
To enable Advanced Tweakables to set fuel direction and priority in Kerbal Space Program, you must first access the main settings page. This is found in the menu, not in the in-game settings. Once there, you will find an option to activate Advanced Tweakables.
Advanced Tweakables allow you to define a priority for fuel tanks, which is used when setting multi-transfer fuel. This is useful when you want to set what engine a fuel tank is used for. For example, if you have a liquid fuel engine and fuel boosters, you may want the fuel tanks to be used by the boosters, but the liquid engine uses the fuel instead. Enabling Advanced Tweakables allows you to set the direction and priority of fuel flow so that you can use the fuel with the desired engine.
Advanced Tweakables also allow you to set fuel drain priority, which can be useful for ensuring that your fuel tanks are used efficiently. This can be important for ensuring that you have enough fuel and thrust for your vessel's mass.
It is worth noting that fuel lines in Kerbal Space Program go in one direction, and engines always pull fuel from the farthest fuel tank. This is an important consideration when staging your fuel tanks and engines. A technique called "onion staging" can be used to maximise fuel/engine power/mass by taking advantage of this fuel flow.
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Engines pull fuel from the farthest fuel tank
In Kerbal Space Program, engines always pull fuel from the farthest fuel tank possible. This is a key concept to understand when learning how to stage fuel tanks properly.
Staging in Kerbal Space Program involves setting up fuel lines and engines in a specific order, and then firing all the engines in the first stage. Once the fuel tanks in the first stage run out, you detach or decouple those tanks and their engines, leaving you with full fuel tanks for the next stage. This process is repeated until you reach your desired altitude.
One common staging method is called "onion staging," where fuel lines are connected in a specific pattern to maximize fuel efficiency and engine power. For example, on a 3x3 grid, you would connect fuel lines from the outer blocks (1, 2, 3, 6, 9, 8, 7, and 4) to the center block (5), which contains the payload. This way, the engines will pull fuel from the outermost tanks first, and you can decouple them one by one as they run out of fuel.
Another staging method is "asparagus staging," where the outer fuel tanks are attached to the next closest inner tank by fuel lines. For a 3-stage launcher, the outermost tanks (stage 1) are connected to the stage 2 fuel tanks, which are then connected to the center-most tanks (stage 3). Again, you fire all the engines in the first stage and then detach the empty tanks, leaving you with full fuel tanks for the next stage.
It's important to note that solid fuel boosters cannot use liquid fuel, and vice versa. Solid fuel boosters have a fixed amount of propellant, while liquid fuel engines use a throttle control system that allows you to adjust the engine's thrust output. Additionally, liquid fuel engines require both liquid fuel and an oxidizer or intake air, depending on the engine type.
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Fuel lines can be used to direct fuel
Fuel lines are a crucial aspect of directing fuel flow and staging fuel tanks effectively in Kerbal Space Program. By understanding how fuel lines work, players can maximize their fuel efficiency and ensure their spacecraft functions as intended.
Firstly, it is important to know that fuel lines in Kerbal Space Program have a specific directionality. When adding a fuel line, players must click and drag to establish the direction of fuel flow, indicated by arrows. This unidirectionality is a fundamental characteristic of fuel lines, and it plays a significant role in fuel prioritization.
Fuel lines can be strategically used to direct fuel from one tank to another or to an engine. By connecting fuel lines from source fuel tanks to destination fuel tanks or engines, players can control the flow of fuel. This is particularly useful when constructing an asparagus staging system, where outer tanks are drained first and dropped once empty, while the central tank remains full.
Additionally, fuel lines can be used in conjunction with decouplers to manage fuel flow. Decouplers require crossfeed activation to enable fuel transfer across different tanks. It is worth noting that fuel lines always take priority, and fuel will flow from the tanks with higher fuel flow priority to those with lower priority. Therefore, it is crucial to pay attention to the direction and priority settings of fuel lines to avoid unintended fuel drainage.
Furthermore, fuel lines can be employed to overcome challenges posed by heat shields. In situations where fuel cannot flow across heat shields, fuel lines can be strategically routed to circumvent this issue and ensure uninterrupted fuel delivery to the engines.
By utilizing fuel lines effectively, players can optimize their spacecraft's performance, ensuring that engines pull fuel from the desired tanks and that fuel is efficiently utilized during different stages of the mission. Proper fuel line management is a key aspect of successful space exploration in Kerbal Space Program.
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Frequently asked questions
One of the most efficient methods for fuel tank staging is Asparagus staging. This involves attaching outer fuel tanks to the next closest inner tank using fuel lines. For example, in a three-stage launcher, the outermost tanks (Stage 1) would be connected by fuel lines to the Stage 2 tanks, which in turn would be connected to the innermost Stage 3 tanks. Once the fuel in the outer tanks is depleted, you can detach the stages, leaving the central tank full.
To set up fuel lines, you must first ensure that fuel can flow between tanks. This can be done by enabling 'crossfeed' on decouplers or by manually creating a fuel supply link if fuel cannot pass through the decoupler. Once fuel can flow between tanks, set up the fuel lines in the desired direction and priority through 'Advanced Tweakables'.
Onion staging is a technique where fuel lines are set up in a way that takes advantage of the fact that engines always pull fuel from the farthest fuel tank possible. For example, in a 3x3 grid of fuel tanks, you would set up fuel lines from tanks 1->2->3->6->5 and 9->8->7->4->5, with your payload attached to the central tank (tank 5).
This issue may be caused by the crossfeed function. In KSP1, crossfeed rules meant that tanks were drained in sequence, not all at once. However, in KSP2, some players have noted that the crossfeed does not work as expected, and adding a fuel line may be necessary to direct the fuel.
