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Overall walk-around of the upper F-1 engine in the display.

Picture 2 of 3.

At right you can see one of the mirrors which give the effect of a full set of five F-1s.

Visible here is the gimbal actuator at the 10:00 position.

This engine is F-1001, the first "production" engine (although it was intended solely for ground test and was never intended to be flown in a vehicle), and several differences with later engines manufactured for flight can be seen:

• No interface panel
• The flexible, internally tied high-pressure ducts
• The turbine exhaust manifold has an inverted "T" shape; later engines have an inverted "Y"-shaped turbine exhaust manifold.

Note that the engine is mounted incorrectly, with the heat exchanger at the bottom of the engine. When mounted in an actual S-IC stage, the heat exchanger would point toward the inboard engine -- roughly at the 4:00 position -- as can be seen on S-IC-15.