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Saturn INT-21

Image:Skylab launch on Saturn V.jpg A Saturn INT-21 launches the Skylab space station, on May 14, 1973</center>
Fact sheet
Function	Space Station launch vehicle
Manufacturer	Boeing (S-IC) North American (S-II)
Country of origin	USA
Size
Height	80 m (262 ft)
Diameter	10 m (33 ft)
Mass	2,916,000 kg (6,429,000 lb)
Stages	2
<td colspan="2">Capacity <tr>	Payload to LEO<td>75,000 kg <tr> <td> <tr> <td> <tr> <td>
Launch History
Status	Retired
Launch Sites	LC-39A, Kennedy Space Center
Total launches <td>1
Successes <td>1
Maiden flight <td>May 14 1973
Last flight <td>May 14 1973
Notable payloads <td>Skylab
First Stage - S-IC
Engines	5 Rocketdyne F-1
Thrust	34.02 MN (7,648,000 lbf)
<td>
Burn time	150 seconds
Fuel	RP-1/LOX
Second Stage - S-II <tr> <td>Engines<td>5 Rocketdyne J-2 <tr> <td>Thrust<td>5 MN (1,000,000 lbf) <tr> <td> <td> <tr> <td>Burn time<td>360 seconds <tr> <td>Fuel<td>LH2/LOX

The Saturn INT-21 was an American orbital launch vehicle of the 1970s. It was derived from the Saturn V rocket, used for the Apollo program, and is commonly mistaken for the Saturn V. It was only launched once, from Kennedy Space Center at Cape Canaveral, carrying the Skylab space station into orbit, at 17:50 GMT, on May 14, 1973. It was intended to be used for other flights in the Apollo Applications Program, and would have also been used to launch other American space stations, including Skylab-B, the S-IVB Dry Workshop, and the S-II Wet Workshop.

The INT-21 and Saturn V have common first and second stages, but they differ in that the INT-21 lacked a third stage. It was also intended to have the instrumentation fitted atop the second stage, but by the time the rocket was actually built, it had been moved to a position atop the payload.

[edit] See also

• Project Apollo
• Saturn I
• Saturn IB
• Saturn V
• Skylab
• Apollo Applications Program
• S-IC
• S-II

[edit] External links

• Saturn INT-21 in Encyclopedia Astronautica