Rajan Wilcox
The Apollo 11 mission on July 20, 1969, was a historic moment in human history as it marked the first time humans set foot on the Moon. The mission was a success, but only just, as astronauts Neil Armstrong and Buzz Aldrin had just 15 seconds of fuel left when they landed on the lunar surface. The Eagle had dropped 90 ft in 30 seconds, leaving the crew with half a minute of fuel to navigate the final 10 ft to the Moon's surface. The first Moon landing was the culmination of eight years of work, 10 practice missions, and the efforts of over 400,000 engineers, scientists, and technicians.
| Characteristics | Values |
|---|---|
| Date of first moon landing | 20 July 1969 |
| Mission | Apollo 11 |
| Astronauts | Neil Armstrong, Buzz Aldrin, Michael Collins |
| Fuel left when landed on the moon | 15 seconds worth of fuel |
| Total fuel in the descent stage | 18,184 lbs |
| Total fuel in the ascent stage | 5,238 lbs |
| Fuel consumed during descent | 17,414 kg |
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What You'll Learn
The Eagle had 15 seconds of fuel left
In the interview, Aldrin recounted his thoughts at the time: "OK. One hundred feet. Sixty seconds. We'd better ease down." However, he chose not to tell Armstrong to hurry. Aldrin's calm demeanour and quick thinking played a crucial role in those critical moments. The Eagle dropped 90 ft in the next 30 seconds, leaving the crew with just 15 seconds of fuel to navigate the final 10 ft to the lunar surface.
The first moon landing was a close call, and the success of the mission hung in the balance. Aldrin recalled that it was only at that late stage that he felt more confident about the landing: "I figured, ah, we got it made." The Eagle's landing was a feat of precision and courage, and the astronauts' expertise and composure under pressure were instrumental in ensuring the mission's success.
The Eagle lunar module was designed with two parts: the descent stage and the ascent stage. The descent stage, or the lower section, contained the rocket engine, fuel, and equipment for science and exploration. The ascent stage, the silver-and-black upper section, housed the crew's pressurised compartment, electronic components, and the main rocket and smaller rocket clusters needed for launch and docking.
The success of the Apollo 11 mission was a significant milestone in space exploration. It fulfilled President John F. Kennedy's 1961 national goal of sending an American to the Moon before the end of the decade. The mission was made possible by the dedication and expertise of thousands of scientists, engineers, and technicians, as well as the brave astronauts who ventured into space.
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The Apollo 11 descent used 17,414kg of fuel
The Apollo 11 mission was a close call, with the lunar module landing on the moon with only 15 seconds of fuel left. The Eagle dropped 90 feet in the next 30 seconds, leaving the crew with just 30 seconds of fuel to navigate the final 10 feet to the lunar surface. The Apollo 11 descent used 17,414kg of fuel out of a total of 18,184kg, leaving only 770kg of fuel. This was a nerve-wracking moment for the astronauts, as a fuel light blinked on while they were still 100 feet (30 meters) above the ground.
The Apollo 11 mission was the first lunar landing, and it involved a complex process of transposition, docking, and extraction. The lunar module, or LM, was a two-stage vehicle with separate engines and 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. During the descent, the ascent stage's fuel was simply payload. The total weight of the LM was about 33,000 lbs, including fuel, which weighed about 53,000 lbs.
The LM descent to the moon's surface consumed a significant amount of fuel due to the weight of the vehicle. During landing, the descent/ascent stage combination weighed between 33,683 and 16,153 lbs. In contrast, during ascent, the ascent stage alone weighed between 10,776 and 5,738 lbs. This weight difference is due to the soil samples and other equipment brought back from the moon.
The Apollo 11 mission was a remarkable achievement, and the successful landing was made possible by careful fuel management and the dedication of the astronauts and mission control team. The close call with fuel highlights the challenges and risks faced during space exploration and the importance of precise calculations and decision-making.
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The Eagle's tank was nearly dry at 100ft
The Eagle had finally landed on the Moon on July 20, 1969, marking the first crewed mission to land on the Moon. The Apollo 11 mission was an eight-year-long endeavour that involved over 400,000 engineers, scientists, and technicians, and cost roughly £150 billion in today's money.
The Eagle, however, almost didn't make it to the lunar surface. As the lunar module descended, a fuel light blinked on when it was just 100 ft (30 metres) above the ground. The Eagle's tank was nearly dry, and the astronauts, Neil Armstrong and Buzz Aldrin, only had 60 seconds left to make it down. Aldrin, the mission's lunar module pilot, recalled his confidence in their chances: "OK. One hundred feet. Sixty seconds. We'd better ease down".
In a video interview, Aldrin described how he held his tongue when the warning light appeared. NASA's capsule communicator, Charlie Duke, informed Aldrin and Armstrong that they had 60 seconds left to descend. Aldrin thought it best not to tell Armstrong to hurry. Armstrong piloted the Eagle semi-manually, using four clusters of rockets to finally touchdown in the Sea of Tranquility.
The Eagle dropped 90 ft over the next 30 seconds, leaving the crew with a further half-minute of fuel to navigate the final 10 ft to the lunar surface. Aldrin recalled that it was only at that late stage that he felt more confident about the landing, thinking, "I figured, ah, we got it made". Estimates suggest that when the Eagle touched down, the crew had about 15 seconds of fuel left.
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The Eagle landed in the Sea of Tranquility
The Eagle has landed—but only just. The Apollo 11 lunar module touched down in the Moon's Sea of Tranquility on July 20, 1969, with only 15 seconds of fuel left in the tank.
The Eagle's landing was a feat that succeeded by the finest of margins. The fuel light had come on 100ft (30m) above the surface, and the tank was nearly dry. The astronauts had just 60 seconds to make it down. Buzz Aldrin, the mission's lunar module pilot, recalled his confidence in the landing only at this late stage: "I figured, ah, we got it made," he said.
The Eagle, with astronauts Neil Armstrong and Buzz Aldrin on board, was guided by a landing radar as Armstrong piloted it semi-manually using four clusters of rockets. The landing was not without its challenges, as Armstrong had to take manual control when the automatic landing system guided the module towards a boulder-covered crater. The landing site was about 12 miles (19km) southwest of the crater Sabine D in the southern Sea of Tranquility.
The Eagle consisted of two parts: the descent stage, which contained the rocket engine, fuel, science and exploration equipment, and a ladder; and the ascent stage, which housed the crew's pressurised compartment and hatch, electronic components, and the main rocket and smaller rocket clusters needed to launch from the lunar surface and re-dock with Columbia. The Eagle was designed to never return to Earth.
The Apollo 11 mission was an ambitious and costly project, taking eight years, 10 practice-run missions, more than 400,000 engineers, scientists and technicians, and roughly £150bn to make the first steps on another planetary body. It was a significant achievement, not just for the US but for all mankind, as Armstrong famously declared: "one small step for [a] man, one giant leap for mankind".
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The Eagle's ascent used a separate fuel tank
The Eagle, also known as the Apollo 11 Lunar Module, was the first crewed vehicle to land on the Moon. It carried two astronauts, Commander Neil A. Armstrong and LM pilot Edwin E. "Buzz" Aldrin, Jr., the first men to walk on the Moon.
The Eagle had separate tanks for landing and ascent. The bottom part of the Eagle 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 descent stage contained the landing rocket, two tanks of aerozine 50 fuel, two tanks of nitrogen tetroxide oxidizer, water, oxygen and helium tanks, and storage space for lunar equipment and experiments. The ascent stage housed the astronauts in a pressurized crew compartment and included an aerozine 50 fuel tank and an oxidizer tank, and helium, liquid oxygen, gaseous oxygen, and reaction control fuel tanks.
The LM descent to the Moon's surface consumed 17,414 lbs of propellant out of a total of 18,184 lbs, leaving only 770 lbs of fuel. However, the LM ascent stage consumed 4,836 lbs of fuel, which is more than the 770 lbs available. This discrepancy has been explained by the fact that the ascent stage had a separate fuel tank that was not counted as being onboard during descent.
The Eagle's landing was a close call, as a fuel light blinked on when the module was still 100 ft (30 m) above the ground. Fortunately, the Eagle landed safely, and Armstrong famously proclaimed, "Houston, Tranquility Base here - the Eagle has landed."
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Frequently asked questions
There are varying estimates, but it is believed that there was only about 15 seconds' worth of fuel left when the Eagle landed on the moon.
The descent to the moon's surface consumed 17,414 kg of fuel out of a total of 18,184 kg, leaving only 770 kg of fuel.
No, the Apollo 11 spacecraft had separate fuel tanks for the descent and ascent stages. The ascent stage used a different set of engines and its own fuel tank.
The ascent stage consumed 4,836 kg of fuel.
The Apollo 11 mission required a lot of fuel because of the distance travelled and the weight of the spacecraft. The ascent stage, for example, weighed between 10,776 and 5,738 lbs.
