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Detail of the fuel additive blender unit (FABU), located on the under side of the thrust chamber as it sits on its pallet.
The H-1 used RP-1, the engine's fuel, mixed with an additive (Oronite) from the FABU to lubricate the turbopumps and gearbox.
The FABU's red heater assembly has been partially removed; see the H-1 engine at Stennis for photos of a FABU's heater assembly laced up as it would be when installed in a Saturn first stage.
| Time picture taken | Mon Sep 9 12:55:12 2013 |
| Location picture taken | Building 4205 Marshall Space Flight Center Huntsville, AL |
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