Mercedes Mullins
The Apollo 11 mission, which landed the first crewed vehicle on the Moon, required a significant amount of fuel for its success. The Saturn V rocket that launched Apollo 11 burned through 203,400 gallons of kerosene fuel and 318,000 gallons of liquid oxygen just to reach 38 miles above the Earth's surface. The Lunar Module (LM) Eagle, which carried astronauts Neil Armstrong and Edwin Buzz Aldrin, Jr., used approximately 17,414 kg of fuel for its descent to the Moon's surface, leaving only around 216-770 kg of fuel remaining upon landing. This close call meant that the astronauts had about 15 seconds of fuel left when they landed on the Moon. The LM ascent stage then used 4,836 kg of fuel to lift off from the Moon and rejoin the Command and Service Module (CSM). The fuel requirements for Apollo 11 were carefully calculated to enable the historic mission's success.
| Characteristics | Values |
|---|---|
| Total fuel for Apollo 11 mission | 100,000 litres of liquid hydrogen and liquid oxygen |
| Fuel for stage 2 | 984,000 litres of liquid hydrogen and 100,000 litres of liquid oxygen |
| Total LM weight | 33,000 lbs |
| Propellant loaded in the descent stage | 18,184 lbs (6,975 lbs of fuel and 11,209 lbs of oxidiser) |
| Propellant loaded in the ascent stage | 5,238 lbs |
| Descent stage weight | 33,683-16,153 lbs |
| Ascent stage weight | 10,776-5,738 lbs |
| Remaining fuel when landed on the moon | 15 seconds' worth |
| Saturn V rocket weight when fuelled | 253,000 lbs |
| Thrust provided by the rocket's five engines | 7.5 million lbs |
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What You'll Learn
Apollo 11 fuel: 15 seconds left when landed
The Apollo 11 mission, which landed on the Moon on July 20, 1969, is remembered as a remarkable achievement in human history. However, few people realize just how close it came to failure. As the Eagle lunar module descended towards the Moon's crater-pocked surface, a fuel light began blinking when it was still 100 feet (30 meters) above the ground. The astronauts, Buzz Aldrin and Neil Armstrong, were informed by Houston that they only had 60 seconds left to land.
The final moments of the descent were a tense and critical period. Aldrin, the mission's lunar module pilot, recalled his thoughts at the time, opting to keep quiet about the warning light to avoid adding more pressure to an already challenging situation. The Eagle dropped 90 feet in the next 30 seconds, leaving the crew with only 30 seconds of fuel to navigate the final 10 feet to the lunar surface.
Aldrin's expertise in orbital mechanics and his calm demeanor under pressure proved invaluable. Despite the fuel light, he assessed the situation and felt confident about their chances of a successful landing. His faith in their remaining fuel was not misplaced, and the Eagle touched down safely with approximately 15 seconds of fuel left. This harrowing landing brought humanity one step closer to exploring the Moon and expanding our understanding of the universe.
The Apollo 11 spacecraft had a complex fuel system, with separate fuel and oxidizer tanks. The total propellant (fuel and oxidizer) loaded in the descent stage was approximately 18,184 pounds, with 6,975 pounds of fuel and 11,209 pounds of oxidizer. The low fuel level during the landing was not due to insufficient fuel but rather the result of the fuel burn during the descent and the complexities of lunar landing. The success of the mission, despite the fuel constraints, showcases the ingenuity, courage, and skill of the astronauts and the entire Apollo team.
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Saturn V rocket: 300,000+ lbs of propellant
The Apollo 11 mission to the Moon was made possible by the Saturn V rocket, which was the largest rocket at the time. The rocket was incredibly powerful, boasting 11 J-2 engines that each served a specific function across the rocket's three stages. The Saturn V rocket had to push more than 300,000 pounds of propellant and gear, along with the Lunar and Service Modules, as well as the Apollo command crew.
The rocket's first stage was 138 feet tall and 33 feet in diameter, with five Rocketdyne F-1 engines. These engines provided a total of 7.5 million pounds of thrust. The first stage consisted almost entirely of propellant, made from RP-1 fuel and liquid oxygen, which acted as the oxidizer. The Saturn V rocket's third stage, which weighed around 253,000 pounds, was unique in that it was fired more than once. It first burned for 165 seconds to get through Earth's orbit and then burned again to reach the Moon.
The Saturn V rocket played a crucial role in the success of the Apollo 11 mission. Its powerful engines and large propellant capacity enabled the spacecraft to break free from Earth's orbit and embark on its historic journey to the Moon.
The Lunar Module, nicknamed the Eagle, was responsible for the final descent to the Moon's surface. During this descent, the crew encountered a nerve-wracking moment when a fuel light blinked on with about 100 feet left to go. Despite the low fuel warning, the crew successfully landed the Eagle with only 15 seconds of fuel remaining. This thrilling conclusion to the Apollo 11 mission underscores the importance of precise fuel management and the exceptional skill and composure of the astronauts involved.
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Descent stage: 18,184 lbs of propellant
The Apollo 11 mission required a significant amount of fuel to power the spacecraft through its various stages. The descent stage, in particular, consumed a large portion of the total propellant.
According to sources, the descent stage of Apollo 11 had 18,184 lbs of propellant loaded, which included both fuel and oxidizer. This propellant was essential for the spacecraft's descent and landing on the Moon. The breakdown of this propellant is as follows: 6,975 lbs of fuel and 11,209 lbs of oxidizer. The fuel had a density of 793 kg/m^3, resulting in 1054 gallons, while the denser oxidizer, at 1440 kg/m^3, yielded 932 gallons.
The descent stage of Apollo 11 consumed a significant amount of propellant during its journey to the Moon. It is estimated that 17,414 kg of fuel was used, leaving only around 770 kg remaining. This discrepancy in the numbers has been a topic of discussion, with some questioning the accuracy of the data presented. However, it's important to note that the ascent stage also had its own separate fuel supply, which may account for some of the differences in fuel consumption calculations.
The successful landing of Apollo 11 on the Moon was a remarkable achievement, made possible by the precise management of propellant. The commander had enough propellant to hover and survey the landing site, making corrections if needed. The ability to abort the landing by jettisoning the descent stage and firing the ascent engine was also a crucial aspect of the mission's safety protocols.
The Lunar Module (LM) of Apollo 11, also known as the Lunar Excursion Module (LEM), was a two-stage spacecraft that ferried the crew between lunar orbit and the Moon's surface. The descent stage played a vital role in the mission, serving as a launchpad for the ascent stage during takeoff. The spent descent stage was left on the Moon, while the ascent stage returned to the command module.
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Ascent stage: 5,238 lbs of propellant
The Apollo 11 mission required a significant amount of fuel to power the spacecraft through its various stages. The ascent stage of Apollo 11, in particular, utilised 5,238 lbs of propellant, according to the "LM Ascent Stage Propellant Status" table. This figure represents the fuel and oxidiser loaded into the ascent stage, which is separate from the descent stage.
The ascent stage played a critical role in the mission's success. It was responsible for lifting off from the Moon and returning to orbit to rendezvous with the command and service module. This stage required a precise amount of propellant to ensure a safe and efficient journey back into space.
The fuel and oxidiser were stored separately in the ascent stage. The fuel had a lower density of 793 kg/m^3, resulting in 1054 gallons, while the denser oxidiser, at 1440 kg/m^3, yielded 932 gallons. This arrangement allowed for the optimal use of space within the ascent stage, ensuring that the propellant did not take up excessive room.
The ascent stage's propellant usage was carefully managed to ensure it fell within the fuel margins. The ascent stage's weight, including the weight of the astronauts, gear, and lunar samples, was a crucial consideration. The efficient use of propellant in the ascent stage contributed to the overall success of the Apollo 11 mission, allowing the astronauts to safely return to the command module and complete their journey back to Earth. Despite the success of the mission, it was reported that the Apollo 11 crew only had about 15 seconds of fuel remaining when they landed on the Moon.
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100,000 litres of liquid hydrogen needed
The Apollo 11 mission required 100,000 litres of liquid hydrogen for its various stages. This figure represents the amount of liquid hydrogen fuel needed for the spacecraft to complete its journey to the Moon and back.
The Apollo 11 spacecraft had a volume of 172 cubic metres, yet the volume of liquid hydrogen fuel required for stage 2 alone translates to 984 cubic metres. This discrepancy has been a point of contention for some, as it seems to suggest that the volume needed to store the fuel for stage 2 is much larger than the size of the entire spacecraft. However, this comparison may be flawed due to the different parts of the rocket being confused.
The liquid hydrogen fuel played a crucial role in propelling the Apollo 11 spacecraft to the Moon. The fuel was combined with liquid oxygen as an oxidizer, and the two substances were stored separately in tanks. The descent stage, which consumed a significant amount of fuel during landing, had a much heavier weight than the ascent stage. This weight difference is worth noting because it affects fuel consumption.
The efficiency and practicality of the hydrogen-oxygen fuel cells in the Apollo 11 spacecraft cannot be overstated. The cells were lighter and less bulky than batteries, and they were more efficient than 1960s solar panels. Additionally, the only waste product from the reaction was water, which was essential for the astronauts to drink. The fuel cells were a critical innovation that made the Apollo 11 mission possible, and they continue to be recognised as a significant advancement in space exploration.
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Frequently asked questions
The Apollo 11 Lunar Module (LM) "Eagle" used 17,414kg of fuel out of a total of 18,184kg to descend to the moon's surface.
When Apollo 11 landed on the moon, they had about 15 seconds of fuel left, or 216 pounds (98 kg) of usable fuel remaining.
The Saturn V rocket burned through 203,400 gallons of kerosene fuel and another 318,000 gallons of liquid oxygen to lift the spacecraft 38 miles into the sky.
The Lunar Module Eagle used two tanks of aerozine 50 fuel and two tanks of nitrogen tetroxide oxidizer.
