at launch: ~4,400 lb (1996 kg)

Mission history

There was no instrument unit for Saturn I Block I boosters (SA-1 to SA-4). Guidance and control equipment was carried in canisters on top of the S-I first stage, and included the ST-90 stabilized platform, made by Ford Instrument Company and used in the Jupiter missile.

The IU made its debut with SA-5, the first Saturn I Block II launch. The first version of the IU was 154

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