The Saturn IB (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 Saturn IB (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).
Source: Wikipedia "Saturn IB" · CC BY-SA 4.0
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