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The manned Apollo space missions were launched on top of Saturn V launch vehicles. What does the "V" signify?
The Saturn V launch vehicle itselft consisted of three stages:
First Stage (S-IC): The first stage includes the 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.
Answer: http://www.nasm.si.edu/collections/i...lo/saturnV.htm
The Saturn V launch vehicle itselft consisted of three stages:
First Stage (S-IC): The first stage includes the 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.
Answer: http://www.nasm.si.edu/collections/i...lo/saturnV.htm