F-1 Engine Mockup FM-101
As detailed in Alan Lawrie's Saturn, Rocketdyne produced seven serialized engine mock-ups, high-fidelity yet non-functional mock-ups used for early engineering purposes. Today, most of these engine mock-ups are mounted on the first stages of the Saturn Vs whose first stages are test (i.e., non-flight) stages.
The second of these, FM-101 (the first was FM-100) was featured in a paper written by D.E. Aldrich which I found during one of my visits to the archives of the University of Alabama at Huntsville:
I don't know exactly when FM-101 (or any of these engine mock-ups) were manufactured, but they certainly reflect an early design:
- There is no provision for thermal insulation.
- There is no interface panel.
- The fuel high-pressure ducts are straight, rather than the "U"-shaped ducts which characterized later production engines.
- The LOX dome has twin-elbow inlets.