Sylvie Willis
The Space Shuttle external tank (ET) is the component of the Space Shuttle launch vehicle that contains the liquid hydrogen fuel and liquid oxygen oxidizer. The ET is the largest and heaviest element of the Space Shuttle when loaded. The external tank's colour is orange, which is the colour of the spray-on foam insulation. The tanks can also appear to be rusted or a darker reddish brown. The first two tanks, used for STS-1 and STS-2, were painted white to protect the tanks from ultraviolet light. However, it was later found that the paint did not protect the foam and that painting the tanks added 600 lbs of weight, so the tanks were left unpainted from STS-3 onwards.
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What You'll Learn
- The orange colour of the external tank is due to the spray-on foam insulation
- The first two external tanks were painted white to protect them from UV light
- The white paint added 600 lbs of weight, so it was removed to increase cargo capacity
- The external tank is the largest and heaviest element of the Space Shuttle when loaded
- The tank is composed of three parts: the forward liquid oxygen tank, the aft liquid hydrogen tank, and the interconnecting structure
The orange colour of the external tank is due to the spray-on foam insulation
The Space Shuttle external tank (ET) is the component of the Space Shuttle launch vehicle that contains the liquid hydrogen fuel and liquid oxygen oxidizer. During lift-off and ascent, it supplies the fuel and oxidizer under pressure to the three RS-25 main engines in the orbiter. The ET is the largest element of the Space Shuttle, and when loaded, it is also the heaviest.
The foam insulation on the external tank serves an important function. It helps to protect the tank from extreme temperatures during flight. However, there have been issues with pieces of foam detaching from the tank during flight, which can pose a safety hazard. In 2003, a piece of foam insulation detached from the tank during the lift-off of STS-107 and struck the wing of Space Shuttle Columbia. This incident resulted in the destruction of the shuttle and the loss of its crew during re-entry.
While the orange colour of the external tank is primarily due to the spray-on foam insulation, there have been discussions about painting the tanks to protect them from UV rays or for corrosion resistance. Some have suggested that the paint does not effectively protect the foam and can introduce drag, affecting the shuttle's performance. Ultimately, the decision to leave the external tank unpainted was made to optimise the shuttle's weight and cargo-carrying capability.
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The first two external tanks were painted white to protect them from UV light
The Space Shuttle external tank (ET) was the component of the Space Shuttle launch vehicle that contained the liquid hydrogen fuel and liquid oxygen oxidizer. During lift-off and ascent, it supplied the fuel and oxidizer under pressure to the three RS-25 main engines in the orbiter. The ET was the largest element of the Space Shuttle, and when loaded, it was also the heaviest. The first two external tanks, used for STS-1 and STS-2, were painted white to protect them from UV light.
The external tanks were always discarded, but there were plans to reuse them in orbit. Ideas included using them as extra living or research space in a space station, as rocket fuel tanks for interplanetary missions, or as raw materials for orbiting factories. Another proposal was to use the ET as a cargo carrier for bulky payloads.
The white paint was intended to reflect UV rays and protect the tank from ultraviolet light during the extended time the shuttle spent on the launch pad. However, it was discovered that the paint did not actually protect the foam from UV damage. As a result, from STS-3 onwards, the external tanks were left unpainted to save weight. The paint added approximately 600 lbs (272 kg) of weight, and removing it meant that an additional 600 lbs of cargo could be carried by the shuttle.
The external tanks had a distinctive orange color, which was the natural color of the spray-on foam insulation. Over time, exposure to sunlight caused the orange foam to darken, turning a reddish-brown color. This color change was due to the foam being exposed to UV rays from the sun. The tanks would often have a sunburned look, with exposed areas that were darker than those protected by the RSS.
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The white paint added 600 lbs of weight, so it was removed to increase cargo capacity
The Space Shuttle external tank (ET) was the component of the Space Shuttle launch vehicle that contained the liquid hydrogen fuel and liquid oxygen oxidizer. The ET was the largest and heaviest element of the Space Shuttle when loaded. The ET was jettisoned just over 10 seconds after the main engine cut off and re-entered the Earth's atmosphere.
The external fuel tank on the space shuttles was originally painted white. The white paint added 600 lbs of weight to the shuttle. The paint was intended to protect the tank from ultraviolet light damage during the extended time the shuttle spent on the launch pad. However, it was later discovered that the paint did not actually protect the foam from UV rays. As a result, starting from the STS-3 mission, the external tank was left unpainted, revealing its "orange-ish" weathered spray foam insulation colour.
The decision to remove the white paint was made to increase the cargo capacity of the shuttle. By eliminating the weight of the paint, an additional 600 lbs of cargo could be carried by the shuttle. This weight reduction resulted in a significant increase in the cargo-carrying capability of the Space Shuttle.
The colour of the external tank can vary depending on its exposure to sunlight. When the tank is exposed to UV rays from the sun, the spray foam insulation turns from a creamy tan colour to an orange or reddish-brown colour over time. This colour-changing process is similar to the colour change of spray foam used in household applications.
Over the years, NASA has worked to further reduce the weight of the ET to increase overall efficiency. For example, after the STS-4 mission, several hundred pounds were eliminated by removing the anti-geyser line, which reduced the accumulation of gaseous oxygen during pre-launch tanking. These weight reduction efforts have allowed for greater cargo capacity and improved efficiency in space shuttle missions.
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The external tank is the largest and heaviest element of the Space Shuttle when loaded
The Space Shuttle external tank (ET) is a vital component of the Space Shuttle launch vehicle, responsible for storing and supplying liquid hydrogen fuel and liquid oxygen oxidizer during lift-off and ascent. It is the largest element of the Space Shuttle and, when loaded, it becomes the heaviest part of the spacecraft. The ET consists of three main components: the forward liquid oxygen (LOX) tank, the aft liquid hydrogen (LH2) tank, and the interconnecting structures and umbilical lines.
The aft liquid hydrogen tank is the largest component of the ET, but due to liquid hydrogen's low density, it is relatively light. The ET's size and weight are critical factors in the Space Shuttle's overall performance and cargo-carrying capability. Its weight reduction directly translates to an increase in the cargo capacity of the Space Shuttle.
The external tank's colour has evolved over time. Initially, for the first two missions, STS-1 and STS-2, the ET was painted white to protect the tanks from ultraviolet light damage during extended periods on the launch pad. However, it was discovered that the paint added approximately 600 pounds of weight, leading to a decision to forgo painting. From STS-3 onwards, the external tank was left unpainted, revealing the orange colour of the spray-on foam insulation underneath.
The orange foam insulation, while functional, is susceptible to colour changes due to sun exposure, resulting in a darker reddish-brown appearance over time. This phenomenon is known as the "sunburn effect," where some parts of the ET may appear lighter or darker due to varying levels of exposure to sunlight. The colour change is not limited to the external tank but is also observed in the spray foam used in construction and household applications.
The Space Shuttle external tank plays a crucial role in the Space Shuttle's operation, and its size and weight have a direct impact on the spacecraft's capabilities. The evolution of the ET's colour from white to the natural orange of the foam insulation highlights the importance of weight optimization in space exploration.
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The tank is composed of three parts: the forward liquid oxygen tank, the aft liquid hydrogen tank, and the interconnecting structure
The Space Shuttle external tank (ET) is composed of three parts: the forward liquid oxygen tank, the aft liquid hydrogen tank, and the interconnecting structure.
The forward liquid oxygen tank is responsible for holding the liquid oxygen oxidizer, which is essential for the operation of the shuttle's engines. The liquid oxygen sensors in this tank play a critical role in ensuring the efficient consumption of the oxidizer and allowing for the timely shutdown of the engines to prevent burning and severe erosion of engine components.
The aft liquid hydrogen tank is the largest part of the ET but is relatively light due to liquid hydrogen's very low density. This section of the tank holds a significant amount of liquid hydrogen fuel, which, along with the liquid oxygen, is supplied under pressure to the RS-25 main engines during lift-off and ascent.
The interconnecting structure, or intertank, serves as a crucial connection point for the external tank to the Solid Rocket Boosters (SRBs) and the orbiter. It provides structural support and houses umbilicals that carry fluids, gases, electrical signals, and power between the tank and the orbiter, as well as between the orbiter and the SRBs.
The external tank as a whole is a vital component of the Space Shuttle launch vehicle, providing fuel and structural stability. Its orange color, derived from the spray-on foam insulation, is a distinctive feature, although the tanks were painted white during the first two missions to protect them from ultraviolet light.
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Frequently asked questions
The shuttle fuel tank is typically known for its orange color, which is the color of the spray-on foam insulation. The tank starts out looking orange and gets darker over time, turning a reddish-brown color.
The shuttle fuel tank was originally painted white for its first two launches, STS-1 and STS-2, to protect the tank from ultraviolet light. However, it was later decided that painting the tank was unnecessary and added too much weight, so the tank was left unpainted, revealing its orange color.
Yes, the color of the shuttle fuel tank can change over time due to exposure to sunlight. The tank starts out looking orange, but as it is exposed to sunlight, it can turn a darker reddish-brown color. This is sometimes referred to as a "sunburn effect".
In addition to the orange color of the spray-on foam insulation, there have been reports of the shuttle fuel tank appearing rust-colored or dark, similar to the color of the metal skin of the tank. The tanks can also have a butter-yellow color when they arrive and may look slightly darker when rolled out.
