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Main Engine Statistics
Sea level: 170,097 kilograms
(375,000 pounds)
Vacuum: 213,188 kilograms
(470,000 pounds)
Nominal operating time
8.5 minutes after liftoff
Propellant Mixture
6 parts liquid oxygen to 1 part liquid hydrogen (by weight)
Approximately 3,039 kilograms (6,700 pounds) each
4.27 meters (14 feet) long
2.29 meters (7.5 feet) wide at mouth of nozzle
7.5 hours, 55 starts

IMAGE: Main engine ignition video
Six seconds before launch the space shuttle main engines ignite one at a time just milliseconds apart.

IMAGE: Mission Basics

Space Shuttle Basics

Space Shuttle Main Engines

The three main engines of the space shuttle, in conjunction with the solid rocket boosters, provide the thrust to lift the orbiter off the ground for the initial ascent. The main engines continue to operate for 8.5 minutes after launch, the duration of the shuttle's powered flight.

IMAGE: The three space shuttle main engines

After the solid rockets are jettisoned, the main engines provide thrust which accelerates the shuttle from 4,828 kilometers per hour (3,000 mph) to over 27,358 kilometers per hour (17,000 mph) in just six minutes to reach orbit. They create a combined maximum thrust of more than 1.2 million pounds.

As the shuttle accelerates, the main engines burn a half-million gallons of liquid propellant provided by the large, orange external fuel tank. The main engines burn liquid hydrogen -- the second coldest liquid on Earth at minus 423 degrees Fahrenheit (minus 252.8 degrees Celsius) -- and liquid oxygen.

IMAGE: Space shuttle main engine flow

The engines' exhaust is primarily water vapor as the hydrogen and oxygen combine. As they push the Shuttle toward orbit, the engines consume liquid fuel at a rate that would drain an average family swimming pool in under 25 seconds generating over 37 million horsepower. Their turbines spin almost 13 times as fast as an automobile engine spins when it is running at highway speed.

The main engines develop thrust by using high-energy propellants in a staged combustion cycle. The propellants are partially combusted in dual preburners to produce high-pressure hot gas to drive the turbopumps. Combustion is completed in the main combustion chamber. Temperatures in the main engine combustion chamber can reach as high as 6,000 degrees Fahrenheit (3,315.6 degrees Celsius).

IMAGE: Main engine major components

Each space shuttle main engine operates at a liquid oxygen/liquid hydrogen mixture ratio of 6 to 1 to produce a sea level thrust of 179,097 kilograms (375,000 pounds) and a vacuum thrust of 213,188 (470,000 pounds). The engines can be throttled over a thrust range of 65 percent to 109 percent, which provides for a high thrust level during liftoff and the initial ascent phase but allows thrust to be reduced to limit acceleration to 3 g's during the final ascent phase. The engines are gimbaled to provide pitch, yaw and roll control during the ascent.

Curator: Kim Dismukes | Responsible NASA Official: John Ira Petty | Updated: 08/29/2005
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