Katerina Swanson
SpaceX's Starship is a two-stage, fully reusable, super heavy-lift launch vehicle with a payload capacity of 100–150 tons to low Earth orbit and 27 tons to geostationary transfer orbit. The vehicle consists of two stages: the Super Heavy booster and the Starship spacecraft, both powered by Raptor engines burning liquid methane and liquid oxygen. The Block 2 version of Starship has a height of 52.1 meters and a width of 9 meters, with four sections: the engine bay, oxygen tank, fuel tank, and payload bay. The windward side of the spacecraft is protected by a heat shield that can withstand temperatures of up to 1,400 °C. The vehicle's tanks hold 1,500 tons of propellant, and it takes off with around 4,500 tons of fuel, with 100-150 tons reaching orbit. SpaceX is exploring various approaches to supply methane fuel for the Starship fleet, including buying natural gas, drilling gas wells, and manufacturing methane using processes like the Sabatier process, which converts CO2 and H2 into methane.
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What You'll Learn
Starship's fuel tanks hold 1,500 tons of propellant
SpaceX's Starship is a two-stage, fully reusable, super heavy-lift launch vehicle. It is composed of four general sections: the engine bay, the oxygen tank, the fuel tank, and the payload bay. The propellant tanks on Starship are separated by a common bulkhead, similar to those used on the S-II and S-IVB stages on the Saturn V rocket.
The vehicle's tanks hold 1,500 tons (3,300,000 lb) of propellant, consisting of 1,170 tons (2,580,000 lb) of liquid oxygen and 330 tons (730,000 lb) of liquid methane. Fuel is fed to the engines through four downcomers, with three smaller downcomers feeding the Vacuum Raptors/RVacs and the central downcomer feeding the inner three engines. The central downcomer connects to a large sump, instead of directly to the methane tank itself.
The Starship's fuel requirements depend on its mission and payload. For example, a fully fueled Starship can go from low Earth orbit (LEO) to the NRHO (Near-Rectilinear Halo Orbit) and back to LEO without needing to refuel, but only if it carries a modest payload. This "modest payload" could refer to a crew of 4-6 with a small amount of cargo. However, the Starship HLS (Human Landing System), which is a tougher and larger spacecraft, would require several hundred tons of fuel to return to the surface of the Moon and then back to LEO.
The amount of fuel needed for a mission can be described using the term delta-V (or dV), which refers to the "change of height" needed. The dV needed to get to LEO is about the same as the dV required to travel from LEO to the Moon's surface and back. To achieve this, the Starship would need to fill up completely, which is around 1200 tons of fuel and about 5 refueling flights.
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The fuel consists of liquid oxygen and liquid methane
The Starship spacecraft, developed by SpaceX, is a two-stage, fully reusable, super heavy-lift launch vehicle. It is powered by Raptor engines that burn liquid methane and liquid oxygen. The vehicle consists of two stages: the Super Heavy booster and the Starship spacecraft, both of which are designed to return to the launch site and land vertically for potential reuse.
The fuel for the Starship consists of liquid oxygen and liquid methane. The vehicle's tanks can hold 1,500 tonnes of propellant, comprising 1,170 tonnes of liquid oxygen and 330 tonnes of liquid methane. The fuel is fed to the engines through four downcomers, with three smaller ones feeding the Vacuum Raptors/RVacs and the central downcomer feeding the inner three engines.
The use of liquid methane as a rocket fuel is notable, as methane is the main component of natural gas. SpaceX is exploring various approaches to supply methane fuel for the Starship fleet, including buying natural gas on the open market or drilling gas wells to support their space ambitions. Additionally, they are encouraging research into carbon capture technology with the goal of transforming captured CO2 into methane for rocket fuel.
The specific fuel combination of liquid oxygen and liquid methane offers advantages for space exploration. Liquid methane, as the primary component of natural gas, can be manufactured through processes like the Sabatier reaction, which converts CO2 and H2 into methane and water. This process requires a significant amount of energy, approximately 99,000,000 kWh per day for a single Starship with a launch cadence of three launches per day.
The liquid oxygen and liquid methane propellant system in the Starship provides the necessary fuel for its engines, enabling the vehicle to achieve its designed objectives, such as delivering payloads to low Earth orbit and returning for potential reuse.
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SpaceX wants to transform captured CO2 into methane fuel
SpaceX's Starship is estimated to require 4500 tonnes of fuel per launch, with 100-150 tonnes reaching orbit. The company is exploring various methods to supply methane fuel for its Starship fleet. One approach is to buy natural gas on the open market or source it from their own oil and gas wells. However, SpaceX is also interested in manufacturing methane using a methanation process known as the Sabatier process, which involves converting CO2 and hydrogen into methane and water.
Elon Musk has expressed his desire to encourage research into the "best carbon capture technology" with the ultimate goal of transforming captured CO2 into methane for use as rocket fuel. This aligns with the growing need for carbon removal due to rising CO2 levels and the climate crisis. By utilising carbon capture, SpaceX can achieve greener rocket fuel while simultaneously reducing carbon dioxide in the atmosphere.
The Sabatier process requires approximately 33 kWh per kg of methane, resulting in a daily energy requirement of approximately 99,000,000 kWh to support one Starship with three launches per day. This is a significant amount of energy, especially when compared to the average US home, which consumes about 30 kWh per day.
While the exact details of implementation are still unknown, SpaceX's plan to transform captured CO2 into methane fuel showcases its commitment to addressing the climate crisis while also providing fuel for its space missions. This innovative approach has the potential to revolutionise space exploration by creating a sustainable and environmentally friendly fuel source.
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Starship takes off with around 4,500 tons of fuel
The SpaceX Starship is a two-stage, fully reusable, super heavy-lift launch vehicle under development by American aerospace manufacturer SpaceX. The Starship spacecraft and its Super Heavy booster are both powered by Raptor engines that burn liquid methane—the main component of natural gas—and liquid oxygen. The vehicle is composed of four general sections: the engine bay, the oxygen tank, the fuel tank, and the payload bay.
The exact amount of fuel required for a mission depends on various factors, such as the payload mass and engine efficiency. When discussing orbital fuel consumption, the term delta-V (or "dV") is used to describe the amount of fuel needed for a mission independently of mass and engine efficiency. The dV required for Starship to reach LEO is comparable to the dV needed to travel from LEO to the Moon's surface and back.
SpaceX is exploring different approaches to supplying methane fuel for the Starship fleet, including buying natural gas on the open market, drilling from SpaceX-owned oil and gas wells, or manufacturing methane using processes like the Sabatier process, which involves converting CO2 and H2 into methane and water.
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It needs less fuel to land on the Moon than to take off
The Starship HLS requires a significant amount of fuel to reach the Moon and return. While in orbit, the Starship needs to be refuelled by other Starships up to 10 times before it can embark on a Moon mission. This is due to the Δv requirements for achieving orbit, which leave little room for payload capacity.
The Starship's large size means it will carry far more cargo than previous missions, and it will also bring back multiple tons of cargo, unlike previous missions, which left most of the rocket behind. The Starship will also need to bring enough fuel for both landing and launching from the Moon, as it cannot aerobrake on the Moon due to the lack of an atmosphere. This means more fuel is required for landing, but less is needed for launching due to the Moon's lower gravity and lack of air resistance.
The Starship's fuel requirements for landing on the Moon and taking off are not equal. The Moon's lower delta-v requirements mean that less fuel is needed for take-off than for landing. The Starship can carry more cargo or less propellant if it uses atmospheric braking and lands. Additionally, if the oxidizer, which constitutes about 75% of the propellant mass, can be produced on the Moon, less fuel will need to be brought from Earth, as only methane will be required.
Overall, the Starship's fuel needs for landing on the Moon and taking off are complex and depend on various factors, but it can be concluded that it requires less fuel to take off from the Moon than to land on it.
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Frequently asked questions
The Starship takes off with around 4500 tons of fuel, with 100-150 tons reaching orbit. The vehicle's tanks hold 1,500 tons of propellant, consisting of 1,170 tons of liquid oxygen and 330 tons of liquid methane.
Nearly all of the fuel is used, except for the amount necessary to keep the fuel and oxidizer sumps covered.
SpaceX has stated that Starship, in its baseline reusable design, will have a payload capacity of 100–150 tons to low Earth orbit and 27 tons to geostationary transfer orbit.
