Wednesday, July 08, 2009

Saturn V

Excerpt from Air and Space Museum here:
The manned Apollo missions were each launched aboard a Saturn V launch vehicle. The "V" designation originates from the five powerful F-1 engines that powered the first stage of the rocket. The Saturn V remains the largest and most powerful U.S. expendable launch vehicle ever built.

The Apollo spacecraft, including the Command Module (CM), Service Module (SM) and Lunar Module (LM) sat atop the launch vehicle. Above the CM was the emergency escape system.

The complete assembly including the Apollo spacecraft and the Saturn launch vehicle stood 363 feet tall (110.6 meters) and weighed over 6 million pounds (2.7 million kg).

The Saturn V launch vehicle itselft consisted of three stages:

First Stage (S-IC): The first stage includes the five F-1 engines producing nearly 7.7 million pounds of thrust. These powerful engines are required to lift the heavy rocket fast enough to escape Earth's gravity. The first stage engines are burned at liftoff and last for about 2.5 minutes taking the vehicle and payload to an altitude of 38 miles. The first stage then separates and burns up in the Earth's atmosphere.

Second Stage (S-II): The second stage conatins five J-2 engines. After the first stage is discarded, the second stage burns for approximately 6 minutes taking the vehicle and payload to 115 miles altitude. The second stage is then also discarded.

Third Stage (S-IVB): The third stage contains one J-2 engine. This engine burns for 2.75 minutes boosting the spacecraft to orbital velocity of about 17,500 mph. The third stage is shut down with fuel remaining and remains attached the spacecraft in Earth orbit. The J-2 engine is reignited to propel the spacecraft into translunar trajectory (speed of 24,500 mph) before finally being discarded.

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