Sylvie Willis
In Kerbal Space Program (KSP), fuel transfer tanks are used to transfer fuel between different parts of a rocket or spacecraft. This can be done through fuel ducts, which allow multiple fuel tanks to be connected, or by using fuel lines to transfer fuel to a central tank. The game also features a TAC Fuel Balancer mod, which allows players to select multiple parts and transfer fuel between them simultaneously. Additionally, KSP players can utilize the asparagus staging technique, where external boosters feed fuel to the main engine or other boosters, allowing for more efficient fuel usage during launch.
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What You'll Learn
To connect multiple fuel tanks within a rocket or aircraft
The Kerbal Space Program (KSP) offers players multiple ways to transfer fuel between tanks. One way to transfer fuel is by using a fuel duct, which allows players to connect multiple fuel tanks within the same rocket or aircraft. This can be useful for creating an asparagus staging system, where external boosters feed fuel into the main engine or other boosters, ensuring that the remaining tanks are still full when the external boosters separate.
Another method is to mount additional fuel tanks radially and transfer their contents to a central tank using fuel lines. This can be done with or without decouplers, and the "Flow Priority" option can be adjusted to control how the rocket's mass distribution changes as it uses fuel. Players can also use the "Resource Manager" in the toolbar to select the tanks involved in the transfer, designate which tank is receiving or losing fuel, and start the transfer.
Additionally, mods such as the TAC Fuel Balancer can assist with fuel management, allowing players to select multiple parts and apply operations simultaneously. This includes transferring liquid fuel and oxidizer in the correct 9:11 proportions, which can be challenging to balance manually.
It is important to note that KSP's fuel crossfeed model is often considered unrealistic, as it allows players to connect tanks in any orientation and drain them in ways that may not account for G forces or the complex forces involved in detaching side tanks.
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To transfer fuel between two spacecraft
Another way to transfer fuel is by using a fuel duct, which allows for the connection of multiple fuel tanks within the same rocket or aircraft. Additionally, you can mount additional fuel tanks radially and transfer their contents to a central tank using fuel lines. This method, known as asparagus staging, involves draining and dropping the outer tanks once they are empty while keeping the central tank full.
When using the TAC Fuel Balancer mod, you can select parts by ship, making it easier to transfer fuel into or out of all the ship's tanks simultaneously. This is done by alt-clicking on a part, which selects all the parts on the same ship.
It is important to note that the fuel crossfeed model in KSP is unrealistic compared to real rockets. In KSP, you can connect tanks in any orientation, and tank A will always be drained first, regardless of pumping direction or G forces.
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To balance liquid fuel and oxidizer
In the Kerbal Space Program (KSP) game, fuel transfer can be done in several ways. This includes connecting two fuel tanks with a pipe or transferring fuel between two spacecraft. Another way to transfer fuel is through the use of a fuel duct, which allows for the connection of multiple fuel tanks within the same rocket or aircraft.
KSP rockets tend to have a much lower "aspect ratio" than real rockets, and the fuel crossfeed model is often considered unrealistic. In the stock game, there are tanks for four different fuel mixtures, including liquid fuel and oxidizer, typically in a ratio of 9:11. The KSP TAC Fuel Balancer mod can be used to transfer liquid fuel and oxidizer in the correct proportions, but it can be frustrating to use due to the number of clicks required.
Additionally, adjusting the flow priority can help control how a rocket's mass distribution changes as it uses fuel. This can be done by enabling Advanced Tweakables, which will give fuel tanks a "Flow Priority" option. Tanks with a higher flow priority will be emptied first, followed by those with lower priority. This can be used to create an asparagus staging system, where outer tanks are drained first and dropped when empty, while keeping the central tank full.
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To use a fuel duct
To transfer fuel in KSP, you can use a fuel duct, such as the FTX-2 External Fuel Duct, which is the only fuel line in the game. This allows for the connection of multiple fuel tanks within the same rocket or aircraft. The line must first be connected to the source of the fuel and then to the destination. It is important to observe the arrows depicted on the fuel duct as they indicate the direction of the fuel flow.
The fuel duct can be used to drain fuel from external (side-mounted) tanks or tanks in latter stages. This is particularly useful for asparagus staging, where fuel is first drained from external fuel tanks, allowing them to be jettisoned. This method of staging is effective because it avoids carrying dead weight, such as partially full or empty fuel tanks.
To set up the fuel duct, ensure that the arrows are pointing in the correct direction, from the source of the fuel to the destination. Place the lines on the external tanks first, then click on the middle tanks. You can also use the Alt+click function to copy and paste sections, which can then be hooked up with fuel pipes.
Additionally, the TAC Fuel Balancer mod can be used to transfer liquid fuel and oxidizer in the correct 9:11 proportions. This can be useful for balancing fuel across multiple tanks.
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To use fuel lines to construct an asparagus staging system
Asparagus staging is a rocket design method that involves using parallel engines and fuel crossfeeds to increase initial thrust and available fuel while reducing the dry mass of later stages. This design uses multiple fuel tanks, and fuel lines are necessary to connect these tanks and enable fuel transfer.
The asparagus staging technique was very effective in building efficient rockets in early versions of Kerbal Space Program. However, updates to the game introduced more realistic drag and aerodynamics models, making asparagus staging less efficient and more challenging to design. Today, it is generally recommended to use a single large main engine per stage with a simpler booster arrangement. Nevertheless, asparagus staging can still be useful for constructing exceptionally large rockets when no larger engines are available.
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Frequently asked questions
There are several ways to transfer fuel in KSP. You can use a fuel duct to connect multiple fuel tanks within the same rocket or aircraft. Alternatively, you can connect two fuel tanks with a pipe or transfer fuel between two spacecraft by docking them together and pressing specific keyboard buttons.
The TAC Fuel Balancer mod for Kerbal Space Program allows you to select multiple parts and apply an operation to them at once. However, some users have found it frustrating due to the number of clicks required to complete simple tasks.
Asparagus staging is a technique where external boosters of a rocket feed their own fuel into the main engine or into boosters that would separate later. This allows the craft's remaining tanks to stay full during launch while all engines are engaged.
A fuel tank is a part in the Kerbal Space Program that contains fuels and provides them to the appropriate reaction engines or consumers. There are stock tanks for four different fuel mixtures: liquid fuel and oxidizer (9:11 ratio), liquid fuel alone, monopropellant, and ore.
