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Apollo 11 40th Anniversary - Saturn V Instrument Unit

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Uploaded on Oct 16, 2009

The Saturn V Instrument Unit is a ring-shaped structure fitted to the top of the Saturn V rocket's third stage (S-IVB) and the Saturn IB's second stage (S-IVB). The Instrument Unit contains the guidance system for the Saturn V rocket.

The IU consists of six subsystems: structure, guidance and control, environmental control, emergency detection, radio communications (for telemetry, tracking, and command), and power.

The last version, number 3, was 260 inches (6,600 mm) in diameter and 36 inches (910 mm) tall. It was designed by MSFC but manufactured by IBM in their factory at Huntsville, and flew on all Saturn IB and Saturn V launches. This is the version that is on display in Washington, Huntsville, Houston, and Cape Canaveral.

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