Rajan Wilcox
The Apollo 11 mission was a remarkable feat of human ingenuity and courage. On July 16, 1969, astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins were propelled into orbit atop a Saturn V rocket, reaching an altitude of approximately 42 miles in under three minutes. The Saturn V rocket, standing at over 100m (363 ft), was an engineering marvel, requiring an immense amount of fuel to launch the Apollo spacecraft on its historic journey to the Moon. But how much rocket fuel did Apollo 11 truly need to embark on this monumental mission?
| Characteristics | Values |
|---|---|
| Total fuel consumed by LM descent to the moon's surface | 17,414 kg |
| Total fuel in LM descent stage | 18,184 kg |
| Total fuel in LM ascent stage | 5,238 kg |
| Fuel in LM descent stage | 6,975 lbs |
| Oxidizer in LM descent stage | 11,209 lbs |
| Fuel in LM ascent stage | 4,836 kg |
| Total LM weight | 33,000 lbs |
| Total weight of Saturn V when fuelled | 2,822,171-2,965,241 kg |
| Weight of third stage when fuelled | 253,000 lbs |
| Total number of engines in Saturn V | 11 |
| Number of Rocketdyne F-1 engines in Saturn V | 5 |
| Total thrust provided by the engines | 7.5 million lbs |
| Fuel consumption rate | 42,500 gallons/minute |
| Total fuel consumed in the first stage | 119,000 gallons |
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What You'll Learn
The Saturn V rocket burned 20 tonnes of fuel per second
The Apollo 11 mission, which saw humans land on the moon for the first time, was launched on a Saturn V rocket. This rocket burned a staggering 20 tonnes of fuel per second at launch. To put that into perspective, that's 10 times the amount of fuel Charles Lindbergh used to fly solo across the Atlantic in his aircraft, the Spirit of St. Louis, in 1927.
The Saturn V rocket was first proposed in 1964 and was developed by NASA as part of the Apollo programme. Standing at more than 100m (363ft) tall, the rocket was a colossal feat of engineering. The first stage of the rocket used five F-1 rocket engines, producing 7.5 million lbs. (3.4 million kilograms) of thrust. This stage was used during launch for about two minutes, during which the rocket burned an incredible 40,000 lbs. of fuel per second.
The Saturn V rocket was a crucial component of the Apollo 11 mission, propelling astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins into orbit in just over 11 minutes. The rocket's immense power and fuel consumption were necessary to overcome Earth's gravity and set the spacecraft on a trajectory towards the Moon.
The Lunar Module (LM) of the Apollo 11 mission also played a vital role in the fuel consumption dynamics of the mission. The LM descent to the Moon's surface consumed 17,414kg of fuel, leaving only 770kg for the ascent. However, the ascent stage reportedly used 4,836kg of fuel, which has led to some confusion and speculation about fuel tank configurations and weight calculations.
The Saturn V rocket's fuel consumption was not only about quantity but also efficiency. The rocket nozzles were specifically shaped to maximise thrust while minimising fuel usage. Additionally, the turbo pump was run fuel-rich to keep the exhaust gas cooler, providing an additional thermal barrier to protect the rocket bell from the intense heat of combustion.
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The rocket was fuelled by liquid oxygen and RP-1 kerosene
The Apollo 11 Saturn V rocket was fuelled by liquid oxygen and RP-1 kerosene. RP-1 stands for Rocket Propellant-1 or Refined Petroleum-1. It is a highly refined kerosene formulation used as rocket fuel. Kerosene was chosen for its density, which is greater than that of liquid hydrogen. This meant that the fuel tanks could be smaller and more compact.
Liquid-fuelled rockets that use RP-1 as fuel are known as kerolox rockets. In their engines, RP-1 is atomized, mixed with liquid oxygen (LOX), and ignited to produce thrust. The combination of RP-1 and LOX was first developed in the 1950s. LOX became the preferred oxidizer to use with RP-1, although other oxidizers have also been employed.
RP-1 is widely used globally, but in Russia and other former Soviet countries, the main rocket kerosene formulations are T-1 and RG-1, which have slightly higher densities. These higher densities are achieved by chilling the kerosene before loading it into the rocket's fuel tanks. However, this goes against the purpose of using kerosene over other super-chilled fuels, as the facilities for managing super-chilled fuels are already in place.
The advantages of RP-1 over other rocket fuels include its ability to be stored at ambient temperatures and its lower explosion risk. Although its specific energy is lower, its higher density results in greater energy density. RP-1 also has a lower specific impulse than liquid hydrogen.
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The Lunar Module descent used 17,414kg of fuel
The Apollo 11 mission was, arguably, humankind's greatest technological achievement. On July 16, 1969, astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins were propelled into orbit in just over 11 minutes. The Saturn V rocket burned a staggering 20 tonnes of fuel per second at launch, with propellant accounting for 85% of its overall weight.
The Lunar Module (LM or "Lem") was an integral part of the mission. It was carried in a compartment behind the Command and Service Modules. The Lunar Module descent used 17,414kg of fuel. This was out of a total of 18,184kg, leaving only 770kg of fuel. However, the next table indicates that the LM ascent consumed 4,836kg of fuel, which seems to contradict the previous data.
The LM is a two-stage vehicle with separate fuel tanks for landing and ascent. The bottom part was the landing stage, and the top part was the ascent stage. The fuel figures were separate for each stage, and neither stage could use the other's fuel. The LM descent stage contained fuel and oxidizer, with the fuel weighing 6,975 lbs and the oxidizer weighing 11,209 lbs.
The Lunar Module played a critical role in the Apollo 13 mission as well. When that mission had to be aborted due to an explosion, the Lunar Module served as a "'lifeboat'" for the astronauts, providing power and propulsion for their return to Earth.
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The rocket's third stage burned for 165 seconds
The Apollo 11 mission was launched by a Saturn V rocket, a retired American super heavy-lift launch vehicle developed by NASA under the Apollo program for human exploration of the Moon. The Saturn V rocket was composed of three stages, and was powered by liquid fuel. It stood at more than 100m (363ft) tall and burned through 20 tonnes of fuel per second at launch.
The rocket's third stage, also known as the S-IVB stage, burned for 165 seconds (almost six minutes) to give the spacecraft a velocity close to the Earth's escape velocity of 25,053 mph (40,319 km/h). This was known as the Trans Lunar Injection (TLI) or trans-lunar injection (TLI) burn, which placed the spacecraft on a trajectory towards the Moon.
The TLI burn occurred about two hours after launch and provided an energy-efficient transfer to lunar orbit. This manoeuvre was crucial in ensuring that the spacecraft could harness the power of the Moon's gravity to return to Earth without requiring additional rocket fuel.
The S-IVB stage played a significant role in the mission's success, and its precise burn duration contributed to achieving the necessary velocity and trajectory for the Apollo 11 spacecraft to embark on its historic journey to the Moon.
Additionally, it is worth noting that the Saturn V rocket had a remarkable payload capacity of 310,000 lb (140,000 kg), which included the unburned propellant required for the Apollo command and service module, as well as the Lunar Module.
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The rocket was 363 feet tall
The Apollo 11 mission was launched by a Saturn V rocket, which stands at 363 feet (111 metres) tall. The rocket was developed by NASA's Marshall Space Flight Center in Huntsville, Alabama, and was used to send people to the Moon in the Apollo program in the 1960s and 1970s.
The Saturn V rocket was a three-stage rocket, with the third stage boosting the spacecraft towards the Moon. The rocket was 363 feet tall, about the height of a 36-story building, and 60 feet taller than the Statue of Liberty. It was an impressive and powerful machine, weighing 6.2 million pounds when fully fuelled for liftoff, which is the equivalent of about 400 elephants.
The Saturn V rocket generated 34.5 million newtons (7.6 million pounds) of thrust at launch, creating more power than 85 Hoover Dams. To put that into perspective, a car that gets 30 miles to the gallon could drive around the world around 800 times with the amount of fuel used by the Saturn V rocket for a lunar landing mission. In terms of payload, the Saturn V could launch about 130 tons into Earth orbit, which is about the weight of 10 school buses, and it could launch about 50 tons to the Moon, or about four school buses.
The Saturn V rocket played a crucial role in the Apollo 11 mission, allowing astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins to be propelled into orbit in just over 11 minutes. The rocket's height and power contributed to the success of the mission, enabling the astronauts to make their historic journey to the Moon.
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Frequently asked questions
The Saturn V rocket burned 20 tonnes of fuel per second at launch. 85% of its weight was propellant.
The Saturn V rocket weighed between 2,822,171 and 2,965,241 kg (6,221,823 to 6,537,238 lbs) when fuelled.
The Saturn V rocket consumed fuel at a rate of 42,500 gallons per minute.
The Saturn V rocket used liquid fuel. The first stage used RP-1 fuel and liquid oxygen as an oxidizer.
The LM descent to the Moon's surface consumed 17,414 kg of fuel out of a total of 18,184 kg. The ascent stage used 4,836 kg of fuel.
