Saturn I

Saturn I
The first Saturn I was launched October 27, 1961.
FunctionMedium-lift launch vehicle
ManufacturerChrysler (S-I)
Douglas (S-IV)
Convair (S-V)
Country of originUnited States
Size
Height55 m (180 ft)
Diameter6.60 m (21 ft 8 in)
Mass510,000 kg (1,124,000 lb)
Stages2 or 3
(3rd stage flew, but never in an active configuration)
Capacity
Payload to LEO
Altitude185 km (115 mi)
Orbital inclination28°
Mass9,100 kg (20,000 lb)
(2 stages)
Payload to TLI
Mass2,200 kg (4,900 lb) (2 stages)
Launch history
StatusRetired
Launch sitesCape Canaveral, LC-34 and LC-37
Total launches10
Success(es)10
First flight27 October 1961 (SA-1)
Last flight30 July 1965 (AS-105)
Type of passengers/cargoBoilerplate Apollo CM, Pegasus
First stage – S-I
Powered by8 × H-1
Maximum thrust6,700 kN (1,500,000 lbf)
Burn time~150 seconds
PropellantLOX / RP-1
Second stage – S-IV
Powered by6 × RL10
Maximum thrust400 kN (90,000 lbf)
Specific impulse421 s (4.13 km/s) vacuum
Burn time~482 seconds
PropellantLOX / LH2
Third stage – S-V (flew inactively)[1]
Powered by2 × RL10
Maximum thrust133 kN (30,000 lbf)
Burn time~430 seconds
PropellantLOX / LH2

The Saturn I[a] 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.[2] Its development was taken over from the Advanced Research Projects Agency (ARPA) 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.

President John F. Kennedy identified the Saturn I, and the SA-5 launch in particular, as being the point where US lift capability would surpass the Soviets, after being behind since Sputnik.[3][4]

  1. ^ Encyclopedia Astronautica - Saturn I Archived 2010-12-07 at the Wayback Machine
  2. ^ Terminology has changed since the 1960s; back then, 20,000 pounds was considered "heavy lift".
  3. ^ Newsreel report of JFK with SA-1 (video)
  4. ^ JFK Speech at Brooks AFB, 21Nov63 (video, on the last full day of his life)


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