Saturn-Apollo 5 (SA-5) was the first launch of the Block II

Saturn I The Saturn I was a rocket designed as the United States' first medium lift launch vehicle for up to low Earth orbit payloads.Terminology has changed since the 1960s; back then, 20,000 pounds was considered "heavy lift". The rocket's first stag ...

rocket and was part of the Apollo program. In 1963, President Kennedy identified this launch as the one which would place US lift capability ahead of the Soviets, after being behind for more than six years since Sputnik.

Upgrades and objectives

The major changes that occurred on SA-5 were that for the first time the Saturn I would fly with two stages - the S-I first stage and the S-IV second stage. The second stage featured six engines burning

liquid hydrogen Liquid hydrogen (LH2 or LH2) is the liquid state of the element hydrogen. Hydrogen is found naturally in the molecular H2 form. To exist as a liquid, H2 must be cooled below its critical point of 33 K. However, for it to be in a fully li ...

. Although this engine design (

RL10 The RL10 is a liquid-fuel cryogenic rocket engine built in the United States by Aerojet Rocketdyne that burns cryogenic liquid hydrogen and liquid oxygen propellants. Modern versions produce up to of thrust per engine in vacuum. Three RL10 ve ...

) was meant to be tested several years earlier in the

Centaur A centaur ( ; grc, κένταυρος, kéntauros; ), or occasionally hippocentaur, is a creature from Greek mythology with the upper body of a human and the lower body and legs of a horse. Centaurs are thought of in many Greek myths as being ...

upper stage, in the end the first Centaur was launched only two months before SA-5. This rocket stage was delivered to the Cape by a modified B-377 aircraft, the '' Aero Spacelines Pregnant Guppy''. Other major design changes included the enlargement of the fuel tanks on the first stage. For the first time the rocket would carry its planned 750,000 lb (340,000 kg) of propellant and would use eight upgraded engines producing a thrust each of 188,000

lbf The pound of force or pound-force (symbol: lbf, sometimes lbf,) is a unit of force used in some systems of measurement, including English Engineering units and the foot–pound–second system. Pound-force should not be confused with pound-m ...

(836 kN). The first stage also featured for the first time eight fins for added stability during flight. As with the earlier flight the rocket would still carry only a

Jupiter Jupiter is the fifth planet from the Sun and the List of Solar System objects by size, largest in the Solar System. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, but ...

nosecone instead of a boilerplate Apollo spacecraft. Also the guidance and control computer on the rocket was positioned above the second stage. This was where it would be located on

Saturn V Saturn V is a retired American super heavy-lift launch vehicle developed by NASA under the Apollo program for human exploration of the Moon. The rocket was human-rated, with multistage rocket, three stages, and powered with liquid-propellant r ...

flights. The Instrument Unit controlled the ascent of the rocket through the atmosphere, automatically compensating for any winds or loss of thrust during the ascent. For the first time in the Apollo program, this flight would be an orbital mission. This was possible because of the upgraded first stage and the addition of the second stage. It would enter into an elliptical orbit and re-enter later as its orbit decayed. President Kennedy referred specifically to this launch in a speech at

Brooks AFB Brooks Air Force Base was a United States Air Force facility located in San Antonio, Texas, southeast of Downtown San Antonio. In 2002, Brooks Air Force Base was renamed Brooks City-Base when the property was conveyed to the Brooks Developmen ...

San Antonio ("Cradle of Freedom") , image_map = , mapsize = 220px , map_caption = Interactive map of San Antonio , subdivision_type = Country , subdivision_name = United States , subdivision_type1= U.S. state, State , subdivision_name1 = Texas , s ...

, Texas, on November 21, 1963, the day before he was assassinated. He said: :And in December, while I do not regard our mastery of space as anywhere near complete, while I recognize that there are still areas where we are behind – at least in one area, the size of the booster – this year I hope the United States will be ahead.

Flight

The first scheduled launch attempt was for 27 January 1964, with all going well until 93% of the

liquid oxygen Liquid oxygen—abbreviated LOx, LOX or Lox in the aerospace, submarine and gas industries—is the liquid form of molecular oxygen. It was used as the oxidizer in the first liquid-fueled rocket invented in 1926 by Robert H. Goddard, an applica ...

(LOX) had been loaded into the first stage. At this time, the ground crews switched it from a fast fill to a replenish system. However, the LOX in the tanks began to fall, i.e., it was not being replenished. The cause was found to be a blind flange (a plate without an opening) in the line. This could not be removed easily and the launch had to be postponed for two days. The second launch attempt had no such problems and lifted off into overcast skies at January 29, 1964, 11:25 EST. The

rocket A rocket (from it, rocchetto, , bobbin/spool) is a vehicle that uses jet propulsion to accelerate without using the surrounding air. A rocket engine produces thrust by reaction to exhaust expelled at high speed. Rocket engines work entirely fr ...

sent back 1,183 measurements to the ground during the flight while at the same time it was tracked by six telescopes. For the first 1000 meters the rocket was filmed by 13 cameras that looked for any pitch, yaw, and roll movements. The separation of the two rocket stages was filmed by eight cameras that themselves separated from the rocket to be recovered downrange in the

Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...

. The whole stage separation system worked perfectly with the retrorockets firing on the first stage to decelerate it and ullage rockets on the S-IV firing to settle its fuel to aft of the stage. After an eight-minute burn, the second stage entered into a orbit. At 16,965 kg (37,401 lb) it was the largest

satellite A satellite or artificial satellite is an object intentionally placed into orbit in outer space. Except for passive satellites, most satellites have an electricity generation system for equipment on board, such as solar panels or radioisotope ...

ever to go into orbit at that time. However, the achievement of

Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ...

orbit was not an objective of the mission but merely a bonus. It did show to the American public that the United States could build

launch vehicle A launch vehicle or carrier rocket is a rocket designed to carry a payload (spacecraft or satellites) from the Earth's surface to outer space. Most launch vehicles operate from a launch pad, launch pads, supported by a missile launch contro ...

s as large as those of the

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...

References

External links

*
The Apollo Spacecraft: A ChronologyNASA Space Science Data Coordinated Archive
* ttp://science.ksc.nasa.gov/history/apollo/sa-5/sa-5.html NASA Apollo Mission SA-5
Stages to Saturn
{{Use American English, date=January 2014 Apollo program Spacecraft launched in 1964 Test spaceflights Spacecraft launched by Saturn rockets