Saturn IB

Short description: American rocket used in the Apollo program during the 1960s and 70s

Saturn IB

Three launch configurations of the Apollo Saturn IB rocket: no spacecraft (AS-203), command and service module (AS-202), and Lunar Module (Apollo 5)

Function| Apollo spacecraft development;
S-IVB stage development in support of Saturn V;
Skylab crew launcher
Manufacturer| Chrysler (S-IB)
Douglas (S-IVB)
Country of origin| United States
Size
Height| 141.6 ft (43.2 m)
without payload[1]
Diameter| 21.67 ft (6.61 m)[1]
Mass| 1,300,220 lb (589,770 kg)
without payload[2]
Stages| 2
Capacity
Payload to LEO| 21,000 kg (46,000 lb)[3]
Launch history
Status| Retired
Launch sites| Cape Canaveral, LC-34 and LC-37
Kennedy, LC-39B
Total launches| 9
Successes| 9
First flight| February 26, 1966 (1966-02-26)
Last flight| July 15, 1975 (1975-07-15)
Notable payloads| Apollo CSM,
Uncrewed Apollo LM
First stage – S-IB
Length| 24.44 m (80.17 ft)
Diameter| 6.53 m (21.42 ft)
Empty mass| 42,000 kg (92,500 lb)
Gross mass| 441,000 kg (973,000 lb)
Propellant mass| 399,400 kg (880,500 lb)
Engines| 8 × H-1
Thrust| 7,100 kN (1,600,000 lbf)
Specific impulse| 272 s (2.67 km/s)
Burn time| 150 seconds
Fuel| LOX / RP-1
Second stage – S-IVB
Length| 17.81 m (58.42 ft)
Diameter| 6.53 m (21.42 ft)
Empty mass| 10,600 kg (23,400 lb)
Gross mass| 114,300 kg (251,900 lb)
Propellant mass| 103,600 kg (228,500 lb)
Engines| 1 × J-2
Thrust| 890 kN (200,000 lbf)
Specific impulse| 420 s (4.1 km/s)
Burn time| 480 seconds
Fuel| LOX / LH2

The Saturn IB[lower-alpha 1] (also known as the uprated Saturn I) 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 (90,000 pounds-force [400 kN], 43,380,000 lb-sec total impulse), with the S-IVB (200,000 pounds-force [890 kN], 96,000,000 lb-sec total impulse). The S-IB first stage also increased the S-I baseline's thrust from 1,500,000 to 1,600,000 pounds-force (6,700 to 7,100 kN) and propellant load by 3.1%. This increased the Saturn I's low Earth orbit payload capability from 20,000 to 46,000 pounds (9.1 to 20.9 t), 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.

By sharing the S-IVB upper stage, the Saturn IB and Saturn V provided a common interface to the Apollo spacecraft. The only major difference was that the S-IVB on the Saturn V burned only part of its propellant to achieve Earth orbit, so it could be restarted for trans-lunar injection. The S-IVB on the Saturn IB needed all of its propellant to achieve Earth orbit.

The Saturn IB launched two uncrewed CSM suborbital flights to a height of 162 km, one uncrewed LM orbital flight, and the first crewed CSM orbital mission (first planned as Apollo 1, later flown as Apollo 7). It also launched one orbital mission, AS-203, without a payload so the S-IVB would have residual liquid hydrogen fuel. This mission supported the design of the restartable version of the S-IVB used in the Saturn V, by observing the behavior of the liquid hydrogen in weightlessness.

In 1973, the year after the Apollo lunar program ended, three Apollo CSM/Saturn IBs ferried crews to the Skylab space station. In 1975, one last Apollo/Saturn IB launched the Apollo portion of the joint US-USSR Apollo–Soyuz Test Project (ASTP). A backup Apollo CSM/Saturn IB was assembled and made ready for a Skylab rescue mission, but never flown.

The remaining Saturn IBs in NASA's inventory were scrapped after the ASTP mission, as no use could be found for them and all heavy lift needs of the US space program could be serviced by the cheaper and more versatile Titan III family and also the Space Shuttle.

## Contents

* 1 History
* 2 Specifications
* 2.1 Launch vehicle
* 2.2 Payload configurations
* 2.3 S-IB first stage
* 2.4 S-IVB second stage
* 3 Instrument unit
* 4 Launch sequence events
* 5 Saturn IB vehicles and launches
* 5.1 Saturn IB rockets on display
* 6 Cost
* 7 See also
* 8 Notes
* 9 References
* 10 External links

## History

File:The Saturn IB Story 1960.webm In 1959, NASA's Silverstein Committee issued recommendations to develop the Saturn class launch vehicles, growing from the C-1. When the Apollo program was started in 1961 with the goal of landing men on the Moon, NASA chose the Saturn I for Earth orbital test missions. However, the Saturn I's payload limit of 20,000 pounds (9,100 kg) to 162 km would allow testing of only the command module with a smaller propulsion module attached, as the command and service module would have a dry weight of at least 26,300 pounds (11,900 kg), in addition to service propulsion and reaction control fuel. In July 1962, NASA announced selection of the C-5 for the lunar landing mission, and decided to develop another launch vehicle by upgrading the Saturn I, replacing its S-IV second stage with the S-IVB, which would also be modified for use as the Saturn V third stage. The S-I first stage would also be upgraded to the S-IB by improving the thrust of its engines and removing some weight. The new Saturn IB, with a payload capability of at least 35,000 pounds (16,000 kg),[4] would replace the Saturn I for Earth orbit testing, allowing the command and service module to be flown with a partial fuel load. It would also allow launching the 32,000-pound (15,000 kg) lunar excursion module separately for uncrewed and crewed Earth orbital testing, before the Saturn V was ready to be flown. It would also give early development to the third stage.[2]

On May 12, 1966, NASA announced the vehicle would be called the "uprated Saturn I", at the same time the "lunar excursion module" was renamed the lunar module. However, the "uprated Saturn I" terminology was reverted to Saturn IB on December 2, 1967.[2]

By the time it was developed, the Saturn IB payload capability had increased to 41,000 pounds (19,000 kg).[2] By 1973, when it was used to launch three Skylab missions, the first-stage engine had been upgraded further, raising the payload capability to 46,000 pounds (21,000 kg).

## Specifications

### Launch vehicle

Parameter[1] | S-IB (1st stage)  | S-IVB (2nd stage)  | Instrument unit

|
|
|

Height  | 24.44 m (80.17 ft)  | 17.81 m (58.42 ft)  | 0.91 m (3 ft)
Diameter  | 6.53 m (21.42 ft)  | 6.61 m (21.67 ft)  | 6.61 m (21.67 ft)
Structural mass  | 42,000 kg (92,500 lb)  | 10,600 kg (23,400 lb)  | 2,000 kg (4,400 lb)
Propellant  | LOX / RP-1 | LOX / LH2 | N/A
Propellant mass  | 399,400 kg (880,500 lb)  | 103,600 kg (228,500 lb)  | N/A
Engines  | 8 × H-1  | 1 × J-2 | N/A
Thrust  | 7,100 kN (1,600,000 lbf) sea level  | 890 kN (200,000 lbf) vacuum  | N/A
Burn duration  | 150 seconds  | 480 seconds  | N/A
Specific impulse  | 272 s (2.67 km/s) sea level  | 420 s (4.1 km/s) vacuum  | N/A
Contractor  | Chrysler | Douglas | IBM

### Payload configurations

Parameter  | Command and service module | Apollo 5 | AS-203

|
|
|

Launch Escape System mass  | 4,200 kg (9,200 lb)  | N/A  | N/A
Apollo command and service module mass  | 16,500 to 20,900 kg (36,400 to 46,000 lb)  | N/A  | N/A
Apollo Lunar Module mass  | N/A  | 14,360 kg (31,650 lb)  | N/A
Spacecraft–LM adapter mass  | 1,840 kg (4,050 lb)  | 1,840 kg (4,050 lb)  | N/A
Nose cone height  | N/A  | 2.5 m (8.3 ft)  | 8.4 m (27.7 ft)
Payload height  | 24.9 m (81.8 ft)  | 11.1 m (36.3 ft)  | N/A
Total space vehicle height  | 68.1 m (223.4 ft)  | 54.2 m (177.9 ft)  | 51.6 m (169.4 ft)

### S-IB first stage

Diagram of the S-IB first stage of the Saturn IB rocket

Main article: Engineering:S-IB

The S-IB stage was built by the Chrysler corporation at the Michoud Assembly Facility, New Orleans.[5] It was powered by eight Rocketdyne H-1 rocket engines burning RP-1 fuel with liquid oxygen (LOX). Eight Redstone tanks (four holding fuel and four holding LOX) were clustered around a Jupiter rocket LOX tank, which earned the rocket the nickname "Cluster's Last Stand".[6] The four outboard engines were mounted on gimbals, allowing them to be steered to control the rocket. Eight fins surrounding the base thrust structure provided aerodynamic stability and control.

Data from:[7]

Template:Rocket specifications

### S-IVB second stage

Diagram of the S-IVB second stage of the Saturn IB

Main article: Astronomy:S-IVB

The S-IVB was built by the Douglas Aircraft Company at Huntington Beach, California. The S-IVB-200 model was similar to the S-IVB-500 third stage used on the Saturn V, with the exception of the interstage adapter, smaller auxiliary propulsion control modules, and lack of on-orbit engine restart capability. It was powered by a single Rocketdyne J-2 engine. The fuel and oxidizer tanks shared a common bulkhead, which saved about ten tons of weight and reduced vehicle length over ten feet.

Template:Rocket specifications

## Instrument unit

The instrument unit, which controlled the Saturn IB and Saturn V

Main article: Astronomy:Saturn V instrument unit

IBM built the instrument unit at the Space Systems Center in Huntsville, Alabama. Located at the top of the S-IVB stage, it consisted of a Launch Vehicle Digital Computer (LVDC), an inertial platform, accelerometers, a tracking, telemetry and command system and associated environmental controls. It controlled the entire rocket from just before liftoff until battery depletion. Like other rocket guidance systems, it maintained its state vector (position and velocity estimates) by integrating accelerometer measurements, sent firing and steering commands to the main engines and auxiliary thrusters, and fired the appropriate ordnance and solid rocket motors during staging and payload separation events.

As with other rockets, a completely independent and redundant range safety system could be invoked by ground radio command to terminate thrust and to destroy the vehicle should it malfunction and threaten people or property on the ground. In the Saturn IB and V, the range safety system was permanently disabled by ground command after safely reaching orbit. This was done to ensure that the S-IVB stage would not inadvertently rupture and create a cloud of debris in orbit that could endanger the crew of the Apollo CSM.

## Launch sequence events

Launch event[8] | Time (s)  | Altitude (km)  | Speed (m/s)

|
|
|

Guidance reference release  | −5.0  | 0.09  | 0
First motion  | 0.0  | 0.09  | 0
Mach 1  | 58.9  | 7.4  | 183
Maximum dynamic pressure  | 73.6  | 12.4  | 328
Freeze tilt  | 130.5  | 48.2  | 1587
Inboard engine cutoff  | 137.6  | 54.8  | 1845
Outboard engine cutoff  | 140.6  | 57.6  | 1903
S-IB / S-IVB separation  | 142.0  | 59.0  | 1905
S-IVB ignition  | 143.4  | 59.9  | 1900
Ullage case jettison  | 154.0  | 69.7  | 1914
Launch escape tower jettison  | 165.6  | 79.5  | 1960
Iterative guidance mode initiation  | 171.0  | 83.7  | 1984
Engine mixture ratio shift  | 469.5  | 164.8  | 5064
Guidance cutoff signal  | 581.9  | 158.4  | 7419
Orbit insertion  | 591.9  | 158.5  | 7426

Acceleration of the Saturn IB increased from 1.24 G at liftoff to a maximum of 4.35 G at the end of the S-IB stage burn, and increased again from 0 G to 2.85 G from stage separation to the end of the S-IVB burn.[8]

AS-206, 207, and 208 inserted the Command and Service Module in a 150-by-222-kilometer (81-by-120-nautical-mile) elliptical orbit which was co-planar with the Skylab one. The SPS engine of the Command and Service Module was used at orbit apogee to achieve a Hohmann transfer to the Skylab orbit at 431 kilometers (233 nautical miles).[8]

## Saturn IB vehicles and launches

Saturn IB mounted on the "milkstool" platform

The first five Saturn IB launches for the Apollo program were made from LC-34 and LC-37, Cape Kennedy Air Force Station.

The Saturn IB was used between 1973 and 1975 for three crewed Skylab flights, and one Apollo–Soyuz Test Project flight. This final production run did not have alternating black and white S-IB stage tanks, or vertical stripes on the S-IVB aft tank skirt, which were present on the earlier vehicles. Since LC-34 and 37 were inactive by then, these launches utilized Kennedy Space Center's LC-39B.[9] Mobile Launcher Platform No. 1 was modified, adding an elevated platform known as the "milkstool" to accommodate the height differential between the Saturn IB and the much larger Saturn V.[9] This enabled alignment of the Launch Umbilical Tower's access arms to accommodate crew access, fueling, and ground electrical connections for the Apollo spacecraft and S-IVB upper stage. The tower's second stage access arms were modified to service the S-IB first stage.[9]

Various mission configurations for the Saturn IB launch vehicle. All Saturn IB launches from AS-201 through ASTP.

Serial
number  | Launch
date
(UTC)  | Launch site  | Mission  | Spacecraft
mass (kg)  | Notes

|
|
|
|
|

SA-201 | February 26, 1966
16:12:01  | Cape Kennedy, LC-34  | AS-201 | 20,820  | Uncrewed suborbital test of Block I CSM
(command and service module)
SA-203 | July 5, 1966
14:53:17  | Cape Kennedy, LC-37B  | AS-203 | None  | Uncrewed test of unburned LH2 behavior in orbit
to support S-IVB-500 restart design
SA-202 | August 25, 1966
17:15:32  | Cape Kennedy, LC-34  | AS-202 | 25,810  | Uncrewed suborbital test of Block I CSM
SA-204 |  | Cape Kennedy, LC-34  | Apollo 1 | 20,412  | Was to be first crewed orbital test of Block I CSM.
Cabin fire on January 27, 1967, killed astronauts and damaged CM during dress rehearsal for planned February 21, 1967 launch
January 22, 1968
22:48:08  | Cape Kennedy, LC-37B  | Apollo 5 | 14,360  | Uncrewed orbital test of lunar module, used Apollo 1 launch vehicle
SA-205 | October 11, 1968
15:02:45  | Cape Kennedy, LC-34  | Apollo 7 | 16,520  | Crewed orbital test of Block II CSM
SA-206 | May 25, 1973
13:00:00  | Kennedy, LC-39B  | Skylab 2 | 19,979  | Block II CSM ferried first crew to Skylab orbital workshop
SA-207 | July 28, 1973
11:10:50  | Kennedy, LC-39B  | Skylab 3 | 20,121  | Block II CSM ferried second crew to Skylab orbital workshop
SA-208 |  | Kennedy, LC-39B  | AS-208  |  | Standby Skylab 3 rescue CSM-119; not needed
November 16, 1973
14:01:23  | Kennedy, LC-39B  | Skylab 4 | 20,847  | Block II CSM ferried third crew to Skylab orbital workshop
SA-209 |  | Kennedy, LC-39B  | AS-209  |  | Standby Skylab 4 and later Apollo-Soyuz rescue CSM-119.
Not needed, currently on display in the KSC rocket garden
|  | Skylab 5  |  | Planned CSM mission to lift Skylab workshop's orbit
to endure until Space Shuttle ready to fly; cancelled.
SA-210 | July 15, 1975
19:50:01  | Kennedy, LC-39B  | ASTP | 16,780  | Apollo CSM with special docking adapter module,
rendezvoused with Soyuz 19. Last Saturn IB flight.
SA-211 |  |  |  | Unused. First stage was on display at the Alabama Welcome Center on I-65 in Ardmore, Alabama from 1979 to 2023: Now dismantled for disposal.[10]
S-IVB stage rests with Skylab underwater training simulator hardware and is on display outdoors at the U.S. Space and Rocket Center in Huntsville, Alabama.
SA-212 |  |  |  | Unused. First stage scrapped.[5]
S-IVB stage converted to Skylab space station.
SA-213 |  |  |  | Only first stage built. Unused and scrapped.[5]
SA-214 |  |  |  | Only first stage built. Unused and scrapped.[5]

For earlier launches of vehicles in the Saturn I series, see the list in the Saturn I article.

### Saturn IB rockets on display

SA-209 on display at KSC

As of 2023 there are two locations where Saturn IB vehicles (or parts thereof) are on display:

* SA-209 is on display at the Kennedy Space Center Visitor Complex, with the Apollo Facilities Verification Vehicle. Due to severe corrosion, the first stage engines and service module were replaced with fabricated duplicates in 1993–1994.
* The SA-211 S-IVB stage was mated with the Skylab underwater training docking adapter and Apollo Telescope Mount and is on display in the Rocket Garden of the U.S. Space & Rocket Center in Huntsville, Alabama. The SA-211 first stage was on display with a mockup S-IVB stage stacked in a launch-ready condition at the Alabama Welcome Center on Interstate 65 in Ardmore, Alabama, since July 1979. [ ⚑ ] 34°57′16″N 86°53′31″W﻿ / ﻿34.954548°N 86.89193°W﻿ / 34.954548; -86.89193[11][12] The structural integrity of the display, after four decades of weathering, could not be repaired. Dismantling of the vehicle for disposal began by September 14, 2023.[10]

## Cost

In 1972, the cost of a Saturn IB including launch was US$55,000,000 (equivalent to $413,000,000 in 2024).[13]

## See also

* Comparison of orbital launchers families
* Comparison of orbital launch systems

## Notes

1. ↑ Pronounced "one bee"

## References

1. ↑ 1.0 1.1 1.2 Postlaunch report for mission AS-201 (Apollo spacecraft 009) -, NASA, May 1966, https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19750065090_1975065090.pdf, retrieved March 18, 2011
2. ↑ 2.0 2.1 2.2 2.3 Wade, Mark. "Saturn IB". Encyclopedia Astronautica. http://www.astronautix.com/lvs/saturnib.htm. Retrieved March 17, 2011.
3. ↑ Hornung, John (2013). Entering the Race to the Moon: Autobiography of an Apollo Rocket Scientist. Williamsburg, Virginia: Jack Be Nimble Publishing. ISBN 9780983044178. https://books.google.com/books?id=MsrJy8mmPv0C&pg=PT207.
4. ↑ Benson, Charles D.; Faherty, William Barnaby (1978). "The Apollo-Saturn IB Space Vehicle". Moonport: A History of Apollo Launch Facilities and Operations. NASA. http://www.hq.nasa.gov/office/pao/History/SP-4204/ch17-3.html. Retrieved 3 February 2016.
5. ↑ 5.0 5.1 5.2 5.3 "Saturn IB History". http://www.spacelaunchreport.com/satstg2.html.
6. ↑ "Saturn I". http://www.astronautix.com/s/saturni.html.
7. ↑ NASA Marshall Spaceflight Center, Skylab Saturn IB Flight Manual (MSFC-MAN-206), 30 September 1972
8. ↑ 8.0 8.1 8.2 Skylab Saturn 1B Flight Manual -, NASA, September 30, 1972, https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740021163.pdf, retrieved July 8, 2020
9. ↑ 9.0 9.1 9.2 Reynolds, David West (2006). Kennedy Space Center: Gateway to Space. Richmond Hill, Ontario: Firefly Books Ltd.. pp. 154–157. ISBN 978-1-55407-039-8. https://archive.org/details/kennedyspacecent00reyn/page/154.
10. ↑ 10.0 10.1 "Historic Alabama welcome center rocket dismantling begins". 14 September 2023. https://www.al.com/news/2023/09/historic-alabama-welcome-center-rocket-dismantling-begins.html.
11. ↑ Dooling, Dave (May 6, 1979). "Space and Rocket Plans Summer Celebration". The Huntsville Times.
12. ↑ Hughes, Bayne (April 6, 2014). "Iconic rocket due for repair". The Decatur Daily. http://www.decaturdaily.com/news/local/article_274db950-be01-11e3-a8d4-001a4bcf6878.html.
13. ↑ "SP-4221 The Space Shuttle Decision- Chapter 6: Economics and the Shuttle". NASA. https://history.nasa.gov/SP-4221/ch6.htm.

## External links

* http://www.apollosaturn.com/
* http://www.spaceline.org/rocketsum/saturn-Ib.html
* NASA Marshall Spaceflight Center, "Skylab Saturn IB Flight Manual". https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740021163_1974021163.pdf. (19.8 MB), 30 September 1972
* "Saturn launch vehicles". https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19710065502_1971065502.pdf. (61.2 MB)

* v
* t
* e

Apollo program hardware

Launch vehicles|

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Launch vehicle
components|

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Category:Apollo program hardware

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Orbital launch systems

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Orbital launch systems developed in the United States

Active|

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In development|

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Retired|

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* v1.0
* v1.1
* v1.2 "Full Thrust"
* H-I*
* Juno I
* Juno II
* N-I*
* N-II*
* Pilot
* Saturn
* I
* IB
* V
* Scout
* Space Shuttle
* SPARK
* Sparta
* Thor
* Able
* Ablestar
* Agena
* Burner
* Delta
* DSV-2U
* Thorad-Agena
* Titan
* II GLV
* IIIA
* IIIB
* IIIC
* IIID
* IIIE
* 34D
* 23G
* CT-3
* IV
* Vanguard

* * - Japanese projects using US rockets or stages

* v
* t
* e

Saturn launch vehicle family

Early proposals|

* Juno V
* Saturn A-1
* A-2
* B-1

"C" series|

* Saturn C-1
* C-2
* C-3
* C-4
* C-5
* C-5N
* C-8

Saturn I series|

* Saturn I
* IB
* IB-CE
* IB-A
* IB-B
* IB-C
* IB-D
* INT-05
* INT-11
* INT-12
* INT-13
* INT-14
* INT-15
* INT-16
* INT-27
* LCB

Saturn II series|

* Saturn II
* INT-17
* INT-18
* INT-19

Saturn V series|

* Saturn V
* MLV
* V ELV
* INT-20
* INT-21
* INT-23
* INT-24
* INT-25
* Saturn-Shuttle
* Saturn V-3
* V-A
* V-B
* V-C
* V-D
* V-Centaur
* Jarvis

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Original source: https://en.wikipedia.org/wiki/Saturn IB. Read more

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