Regan Brown
The cost of fuel for space missions is a highly complex topic, with many variables to consider. The type, amount, and performance of the fuel all play a crucial role in determining the overall cost. For example, the space shuttle's main engine uses a significant amount of liquid hydrogen and liquid oxygen—approximately 385,000 gallons and 143,000 gallons, respectively. Additionally, the shuttle's external fuel tank can hold over half a million gallons of self-combustible liquid. The solid rocket boosters further contribute to the fuel load, with two million pounds of rubbery aluminum fuel. These complex fuel requirements and the engineering challenges of space travel make calculating the precise cost of fuel for space shuttle missions a challenging task.
| Characteristics | Values |
|---|---|
| Fuel in the external tank | 385,000 gallons of liquid hydrogen and 143,000 gallons of liquid oxygen |
| Fuel in the two "solid rocket boosters" | 2 million pounds of rubbery aluminium fuel |
| Total weight of the shuttle at launch | 4.5 million pounds |
| Weight of the shuttle when it reaches orbit | 10% of its launch mass |
| Amount of fuel needed by SpaceX's Starship to transport fuel inside it to outer space | 4500 tons, out of which 100-150 tons can reach orbit |
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What You'll Learn
- The space shuttle's main engine uses liquid hydrogen and liquid oxygen
- Solid rocket boosters generate 85% of the thrust needed for take-off
- SpaceX's Starship takes off with around 4500 tons of fuel
- The shuttle has an external fuel tank that holds over half a million gallons of self-combustible liquid
- Returning shuttles can glide back to Earth without using fuel
The space shuttle's main engine uses liquid hydrogen and liquid oxygen
The liquid hydrogen and liquid oxygen propellants are stored in separate tanks within the ET. The liquid hydrogen tank is the largest part of the ET, but it is relatively light due to liquid hydrogen's very low density. The liquid oxygen tank, on the other hand, is smaller but requires thermal protection from aeroheating. The ET also includes a thermal protection system, primarily consisting of spray-on foam insulation (SOFI) and other materials, to manage the extreme temperatures during flight.
The RS-25 engines utilize various components such as pumps, valves, and bellows to control the flow of propellants and generate thrust. The engines produce a specific impulse (Isp) of 452 seconds (4.43 kN-sec/kg) in a vacuum or 366 seconds (3.59 kN-sec/kg) at sea level. The RS-25 nozzle has a large expansion ratio of about 69:1, which aids in engine operation and prevents flow separation, reducing the risk of control difficulties and mechanical damage.
The Space Shuttle's fuel system also includes solid rocket boosters that provide additional thrust during the initial launch phase. These boosters contribute to about 85% of the thrust needed for liftoff. After two minutes, the boosters drop away and are recovered for reuse. The ET is jettisoned about ten seconds after the main engine cut-off and re-enters the Earth's atmosphere, breaking up before impact in the ocean.
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Solid rocket boosters generate 85% of the thrust needed for take-off
The Space Shuttle Solid Rocket Boosters (SRBs) are a vital component of the space shuttle's propulsion system. Each shuttle has two SRBs, which together generate 85% of the thrust required for the shuttle to lift off from the ground. These boosters are approximately 149.16 ft (45.46 m) long and 12.17 ft (3.71 m) in diameter, with each weighing about 1,300,000 lb (590 t) at launch.
The SRBs use solid propellants, which consist of a fuel/oxidizer mix combined in a rubber-like substance and applied to the inside of the rocket's shell. The primary propellants in the SRBs are ammonium perchlorate as the oxidizer, aluminum powder as the fuel, and PBAN as an adhesive. This mixture provides a significant amount of thrust, with each SRB capable of producing a maximum of 14.7 MN (3,300,000 lbf) of thrust.
The use of solid propellants in the SRBs offers several advantages. Firstly, they provide a high thrust-to-weight ratio, making them powerful for their size. Secondly, solid propellants are generally safer than liquid propellants as they do not require pressurization and are less susceptible to leaks. Additionally, solid propellants have a longer shelf life and are easier to store than liquid propellants.
However, one significant drawback of solid rocket boosters is that they cannot be stopped once ignited. This means that the rocket will continue to burn at maximum thrust until all the solid propellant is depleted. This lack of throttle control can be a safety concern, as evidenced by the Space Shuttle Challenger disaster in 1986, where the failure of an O-ring seal in the solid rocket booster led to the explosion of the external fuel tank and the destruction of the shuttle.
Despite this drawback, solid rocket boosters have proven to be reliable and cost-effective for launching vehicles into Low Earth Orbit and beyond. They are routinely used by companies like United Launch Alliance (ULA) and Arianespace to increase payload capacity and provide the additional thrust needed for their launch vehicles.
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SpaceX's Starship takes off with around 4500 tons of fuel
SpaceX, an American aerospace company founded in 2002, designs, manufactures, and launches advanced rockets and spacecraft with the ultimate goal of enabling people to live on other planets. Its Starship vehicle takes off with around 4500 tons of fuel, of which around 100-150 tons can reach orbit.
The amount of fuel required for a rocket launch depends on several factors, including the rocket's mass, the payload, and the desired orbit. In general, rockets require a significant amount of fuel to escape Earth's gravity and reach orbit.
The SpaceX Starship is a two-stage rocket, which means it has two separate sets of engines that are used at different stages of the launch. The first stage is used to lift the rocket off the ground and reach a certain altitude, while the second stage is used to propel the payload to the desired orbit.
According to some calculations, the Starship may need up to 5000 tons of propellant to safely deliver a 100-ton payload to a usable low Earth orbit (LEO) and land again. This includes the fuel needed to launch and land the rocket, as well as account for various factors such as atmosphere, boil-off, and landing requirements.
The type of fuel used in rocket launches is also important. Traditional chemical rockets, like the space shuttle, use liquid hydrogen and liquid oxygen as propellants. The space shuttle's main engine uses 385,000 gallons of liquid hydrogen and 143,000 gallons of liquid oxygen. SpaceX's Starship may use different types of propellants, but the details of its fuel are not publicly available.
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The shuttle has an external fuel tank that holds over half a million gallons of self-combustible liquid
The space shuttle is comprised of three main parts: an orbiter that holds the crew, payload, and three main engines; an external fuel tank; and two solid rocket boosters. The external fuel tank contains over half a million gallons of self-combustible liquid, which fuels the orbiter's three main engines. The two solid rocket boosters use a mixture of ammonium perchlorate, aluminium, iron oxide, PBAN or HTPB polymers, and an epoxy curing agent. This mixture is highly combustible and generates 85% of the thrust needed to launch the shuttle.
The shuttle's main engine uses liquid hydrogen and liquid oxygen as fuel. These fuels are highly combustible and provide the necessary thrust for the shuttle to reach orbit. The external fuel tank is essential for providing the propellant for the shuttle's engines, and its contents are crucial for the shuttle's successful launch and operation in space.
The amount of fuel required for a space shuttle launch is significant. The external fuel tank holds a vast amount of liquid fuel, and the solid rocket boosters also contribute to the total fuel load. This large fuel load is necessary to generate the thrust required to lift the shuttle's massive weight off the ground and propel it into space.
The space shuttle's fuel system is designed to provide the necessary thrust and propulsion for the vehicle to successfully reach orbit and carry out its mission. The self-combustible liquid in the external fuel tank is a critical component of the shuttle's fuel system, enabling the engines to function and the shuttle to achieve its objectives in space exploration.
The space shuttle's fuel system, including the external fuel tank and solid rocket boosters, showcases the engineering complexities and fuel requirements necessary for space exploration. The successful utilisation of self-combustible liquids and solid propellants highlights the advancements in rocketry and space travel, enabling missions that expand our understanding of the cosmos.
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Returning shuttles can glide back to Earth without using fuel
The space shuttle has three main parts: a stubby, airplane-like "orbiter" that holds the crew, payload, and three main engines; an immense external fuel tank that holds more than half a million gallons of self-combustible liquid; and two "solid rocket boosters" that provide 85% of the thrust needed for takeoff. The shuttle's main engine uses 385,000 gallons of liquid hydrogen and 143,000 gallons of liquid oxygen.
On the launchpad, the shuttle weighs four and a half million pounds. Two minutes after launch, the boosters finish their work, drop into the ocean, and can be reused. Six minutes later, the now-empty external tank drops off and disintegrates as the shuttle enters orbit. By this point, 90% of its launch mass has been left behind.
When returning to Earth, the shuttle can glide back unpowered, using the atmosphere as a source of friction to slow it down. However, the craft is travelling much faster during its descent than during launch, so heat and friction are bigger problems. To address this, the leading surface of the craft can be shielded with a heat shield, which dissipates heat through ablation or shock waves in the air.
Unfortunately, heat shields are not infallible. In 2003, the Columbia space shuttle broke apart during re-entry due to a hole in the shield covering the left wing, resulting in the deaths of the seven astronauts on board. As an alternative to heat shields, a filling station could be placed in Earth orbit to provide returning shuttles with a new set of tanks to slow their descent.
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Frequently asked questions
The space shuttle requires a large amount of fuel to launch, including an immense external fuel tank that holds more than half a million gallons of self-combustible liquid and two solid rocket boosters that provide about 2 million pounds of fuel.
The space shuttle's main engine uses liquid hydrogen and liquid oxygen as fuel, with the latter acting as an oxidizer.
The shuttle weighs about 4.5 million pounds at launch, and 90% of its launch mass, including fuel, is left behind during the ascent to orbit.
