Saturn I SA-1

Last updated
Saturn I SA-1
SA-1 LO.jpg
SA-1 lifting off
Mission typeTest flight
Operator NASA
Mission duration15 minutes
Distance travelled331.5 kilometers (206.0 mi)
Apogee136.2 kilometers (84.6 mi)
Spacecraft properties
Launch mass52,480 kilograms (115,700 lb)
Start of mission
Launch dateOctober 27, 1961, 15:06:04 (1961-10-27UTC15:06:04Z) UTC
Rocket Saturn I SA-1
Launch site Cape Canaveral LC-34
End of mission
Decay dateOctober 27, 1961, 15:21:04 (1961-10-27UTC15:21:05Z) UTC
Project Apollo
Uncrewed tests
 

Saturn-Apollo 1 (SA-1) was the first flight of the Saturn I space launch vehicle, the first in the Saturn family, and first mission of the American Apollo program. The rocket was launched on October 27, 1961, from Cape Canaveral, Florida. [1]

Contents

Objectives

The Saturn I booster was a huge increase in size and power over anything previously launched. It was three times taller, required six times more fuel and produced ten times more thrust than the Juno I rocket that had launched the first American satellite, Explorer 1 , into orbit in 1958. [2]

At the time, NASA had decided to not use all-up testing, when an entire system is tested at once. The agency planned to test each rocket stage in separate launches, so for SA-1 the only live stage was the S-I first stage.

This first flight was designed to test the structure of the launch vehicle during a suborbital flight using the nose cone from a Jupiter rocket.

Preparation

SA-1 before launch Saturn SA1 on launch pad.jpg
SA-1 before launch

As this was the first Saturn flight, the systems were still being developed. It was the first time that a stage had been delivered to Cape Canaveral by barge and it demonstrated this could be done for the larger stages of future Saturn rockets. The first stage and the two dummy upper stages arrived on August 15, 1961, on the barge Compromise. It had encountered some problems on the voyage, running aground four times due to poor nautical charts. On the return trip, the barge hit a bridge, causing some minor damage. [3]

The booster was erected at Pad 34 five days later with little trouble. Testing proceeded, albeit a little behind schedule. At this time, testing was not automated and amounted to flicking switches in the control center and observing how the rocket responded.

Flight

At 12:30 p.m. EST on October 27, 1961, the RP-1 propellant started to flow into the rocket. A slight surplus (3%) [4] of the fuel required was put into the rocket, as it was possible to easily drain fuel. Just before launch, surplus fuel was removed from the tanks.

Liquid oxygen began flowing into its tanks at 3:00 a.m. the next day. It followed the same procedure as the RP-1 with the tanks being filled to 10 percent to check for leaks, then fast filled to 97 percent, then slowly topped off.

Despite a couple of delays due to bad weather, the rocket was launched only one hour behind schedule. The engineers had given the rocket only a 75 percent chance of lifting off and only a 30 percent chance of completing a nominal flight. Even with a nominal flight some damage was thought possible. At the Redstone Arsenal, ground testing had shattered windows 12 km away.

The sound of the launch was a disappointment for some witnesses, being described as like an Atlas rocket launch, when observers stood 1.5 miles (2.4 km) away instead of three miles (5 km) for a Saturn launch. It was later determined that the cause of the difference between the Cape and the Redstone Arsenal was atmospheric conditions damping the sound. [3]

"Ignition. All engines running. Launch commit, launch commit! Liftoff! (shouting) Go, go, go, go! Go man! Go! " [5]

The flight itself was nearly perfect. The rocket reached a height of 136.5 km and impacted 345.7 km down range from the launch site in the Atlantic Ocean. [1] The only real problem was the rocket cut off 1.6 seconds ahead of schedule. This was traced to the fact that there was 400 kg too much liquid oxygen and 410 kg too little RP-1. For the test flight, SA-1 only carried a propellant load that was 83 percent full.

Related Research Articles

<span class="mw-page-title-main">AS-203</span> Uncrewed flight of the Saturn IB rocket, July 5, 1966

AS-203 was an uncrewed flight of the Saturn IB rocket on July 5, 1966. It carried no command and service module, as its purpose was to verify the design of the S-IVB rocket stage restart capability that would later be used in the Apollo program to boost astronauts from Earth orbit to a trajectory towards the Moon. It achieved its objectives, but the stage was inadvertently destroyed after four orbits.

<span class="mw-page-title-main">Saturn I SA-2</span> Second flight of the Saturn I launch vehicle, April 25, 1962

Saturn-Apollo 2 (SA-2) was the second flight of the Saturn I launch vehicle, the first flight of Project Highwater, and was part of the American Apollo program. The rocket was launched on April 25, 1962, from Cape Canaveral, Florida.

<span class="mw-page-title-main">Saturn (rocket family)</span> Family of American heavy-lift rocket launch vehicles

The Saturn family of American rockets was developed by a team of former German rocket engineers and scientists led by Wernher von Braun to launch heavy payloads to Earth orbit and beyond. The Saturn family used liquid hydrogen as fuel in the upper stages. Originally proposed as a military satellite launcher, they were adopted as the launch vehicles for the Apollo Moon program. Three versions were built and flown: the medium-lift Saturn I, the heavy-lift Saturn IB, and the super heavy-lift Saturn V.

<span class="mw-page-title-main">Saturn I SA-3</span> Third flight of the Saturn I

Saturn-Apollo 3 (SA-3) was the third flight of the Saturn I launch vehicle, the second flight of Project Highwater, and part of the American Apollo program. The rocket was launched on November 16, 1962, from Cape Canaveral, Florida.

<span class="mw-page-title-main">Saturn I SA-4</span> March 1963 Apollo program test launch

Saturn-Apollo 4 (SA-4) was the fourth launch of a Saturn I launch vehicle and the last of the initial test phase of the first stage. It was part of the Apollo Program.

<span class="mw-page-title-main">Saturn I SA-5</span> Apollo program test launch

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

<span class="mw-page-title-main">Saturn IB</span> American rocket used in the Apollo program during the 1960s and 70s

The Saturn IB was an American launch vehicle commissioned by the National Aeronautics and Space Administration (NASA) for the Apollo program. It uprated the Saturn I by replacing the S-IV second stage, with the S-IVB. The S-IB first stage also increased the S-I baseline's thrust from 1,500,000 pounds-force (6,700,000 N) to 1,600,000 pounds-force (7,100,000 N) and propellant load by 3.1%. This increased the Saturn I's low Earth orbit payload capability from 20,000 pounds (9,100 kg) to 46,000 pounds (21,000 kg), enough for early flight tests of a half-fueled Apollo command and service module (CSM) or a fully fueled Apollo Lunar Module (LM), before the larger Saturn V needed for lunar flight was ready.

<span class="mw-page-title-main">S-IC</span> First stage of the Saturn V rocket

The S-IC was the first stage of the American Saturn V rocket. The S-IC stage was manufactured by the Boeing Company. Like the first stages of most rockets, most of its mass of more than 2,000 t (4,400,000 lb) at launch was propellant, in this case RP-1 rocket fuel and liquid oxygen (LOX) oxidizer. It was 42 m (138 ft) tall and 10 m (33 ft) in diameter. The stage provided 34,500 kN (7,750,000 lbf) of thrust at sea level to get the rocket through the first 61 km (38 mi) of ascent. The stage had five F-1 engines in a quincunx arrangement. The center engine was fixed in position, while the four outer engines could be hydraulically gimballed to control the rocket.

The Saturn I was a rocket designed as the United States' first medium lift launch vehicle for up to 20,000-pound (9,100 kg) low Earth orbit payloads. The rocket's first stage was built as a cluster of propellant tanks engineered from older rocket tank designs, leading critics to jokingly refer to it as "Cluster's Last Stand". Its development was taken over from the Advanced Research Projects Agency in 1958 by the newly formed civilian NASA. Its design proved sound and flexible. It was successful in initiating the development of liquid hydrogen-fueled rocket propulsion, launching the Pegasus satellites, and flight verification of the Apollo command and service module launch phase aerodynamics. Ten Saturn I rockets were flown before it was replaced by the heavy lift derivative Saturn IB, which used a larger, higher total impulse second stage and an improved guidance and control system. It also led the way to development of the super-heavy lift Saturn V which carried the first men to landings on the Moon in the Apollo program.

<span class="mw-page-title-main">Rocketdyne F-1</span> Rocket engine used on the Saturn V rocket

The F-1, commonly known as Rocketdyne F-1, is a rocket engine developed by Rocketdyne. This engine uses a gas-generator cycle developed in the United States in the late 1950s and was used in the Saturn V rocket in the 1960s and early 1970s. Five F-1 engines were used in the S-IC first stage of each Saturn V, which served as the main launch vehicle of the Apollo program. The F-1 remains the most powerful single combustion chamber liquid-propellant rocket engine ever developed.

<span class="mw-page-title-main">Atlas-Centaur</span> Family of space launch vehicles

The Atlas-Centaur was a United States expendable launch vehicle derived from the SM-65 Atlas D missile. The vehicle featured a Centaur upper stage, the first such stage to use high-performance liquid hydrogen as fuel. Launches were conducted from Launch Complex 36 at the Cape Canaveral Air Force Station (CCAFS) in Florida. After a strenuous flight test program, Atlas-Centaur went on to launch several crucial spaceflight missions for the United States, including Surveyor 1, Mariner 4, and Pioneer 10/11. The vehicle would be continuously developed and improved into the 1990s, with the last direct descendant being the highly successful Atlas II.

<span class="mw-page-title-main">WAC Corporal</span> Sounding rocket

The WAC Corporal was the first sounding rocket developed in the United States and the first vehicle to achieve hypersonic speeds. It was an offshoot of the Corporal program, that was started by a partnership between the United States Army Ordnance Corps and the California Institute of Technology in June 1944 with the ultimate goal of developing a military ballistic missile.

<span class="mw-page-title-main">Kennedy Space Center Launch Complex 39</span> Historic Apollo Moonport

Launch Complex 39 (LC-39) is a rocket launch site at the John F. Kennedy Space Center on Merritt Island in Florida, United States. The site and its collection of facilities were originally built as the Apollo program's "Moonport" and later modified for the Space Shuttle program.

<span class="mw-page-title-main">Modular rocket</span> Rocket with interchangeable components

A modular rocket is a kind of multistage rocket which has components that can interchanged for different missions. Several such rockets use similar concepts such as unified modules to minimize expenses on manufacturing, transportation and for optimization of support infrastructure for flight preparations.

<span class="mw-page-title-main">Cape Canaveral Launch Complex 34</span> Launch site at Cape Canaveral Space Force Station

Launch Complex 34 (LC-34) is a deactivated launch site on Cape Canaveral Space Force Station, Florida. LC-34 and its companion LC-37 to the north were used by NASA from 1961 through 1968 to launch Saturn I and IB rockets as part of the Apollo program. It was the site of the Apollo 1 fire, which claimed the lives of astronauts Gus Grissom, Ed White, and Roger Chaffee on January 27, 1967. The first crewed Apollo launch — Apollo 7 on October 11, 1968 — was the last time LC-34 was used.

<span class="mw-page-title-main">Redstone (rocket family)</span> Class of ballistic missile

The Redstone family of rockets consisted of a number of American ballistic missiles, sounding rockets and expendable launch vehicles operational during the 1950s and 1960s. The first member of the Redstone family was the PGM-11 Redstone missile, from which all subsequent variations of the Redstone were derived. The Juno 1 version of the Redstone launched Explorer 1, the first U.S. orbital satellite in 1958 and the Mercury-Redstone variation carried the first two U.S. astronauts into space in 1961. The rocket was named for the Redstone Arsenal in Huntsville, Alabama where it was developed.

<span class="mw-page-title-main">Saturn V</span> American super heavy-lift expendable rocket

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, had three stages, and was powered with liquid fuel. Flown from 1967 to 1973, it was used for nine crewed flights to the Moon, and to launch Skylab, the first American space station.

The Mercury-Redstone Launch Vehicle, designed for NASA's Project Mercury, was the first American crewed space booster. It was used for six sub-orbital Mercury flights from 1960–1961; culminating with the launch of the first, and 11 weeks later, the second American in space. The four subsequent Mercury human spaceflights used the more powerful Atlas booster to enter low Earth orbit.

<span class="mw-page-title-main">NASA Railroad</span> Short-line railroad at the Kennedy Space Center

The NASA Railroad is a Class III industrial short-line railroad at the Kennedy Space Center in Cape Canaveral, Florida. The railroad consists of 38 miles (61 km) of track connecting the mainline of the Florida East Coast Railway and trackage at the Cape Canaveral Space Force Station. NASA uses the railroad to deliver large or bulk materials to support its operations, particularly solid rocket boosters and chemicals such as helium and oxygen for rocket fuel.

<span class="mw-page-title-main">S-I</span> First stage of the Saturn I rocket

The S-I was the first stage of the Saturn I rocket used by NASA for the Apollo program.

References

  1. 1 2 "NASA Space Science Data Coordinated Archive - Saturn SA-1".
  2. "Explorer Information".
  3. 1 2 Benson, Charles D.; Faherty, William Barnaby (1978). Moonport: A History of Apollo Launch Facilities and Operations - Chapter 3 - Launching the First Saturn I Booster.
  4. "NASA Apollo Mission SA-1". Archived from the original on 30 October 2000.
  5. SATURN I SA-1 launch (1961/10/27) , retrieved 2022-07-17