In this view the black pipes show that part of the C-Stoff flow from the fuel pump, through the regulating valve, outbound to the cooling jacket of the combustion chamber (the top, curved pipe), and then back into the C-Stoff fuel filter; the black pipe on the left of shot.

The first branch on the C-Stoff fuel pipe on the right (just in shot on the bottom right) is the C-Stoff fuel feed into the fuel flow and pressure equalising unit which serves the auxilliary combustion chamber. The auxilliary cruising combustion chamber appears to have a C-Stoff outflow for its own cooling jacket, but the return flow pipe is not obviously apparant in any of the views, so this is currently subject to confirmation.

 

This close-up of the motor illustrates the principle differences of the "C" unit. There is no box frame, the prominent accessories gearbox unit is missing, the steam generator is "inverted" and served by a T-Stoff header tank and the fuel flow control unit is lying horizontally on its back.

In this view the main elements of the main rocket motor are very clearly shown. From the bottom left, there is the main pumping unit. Following in an anti-clockwise direction, the prominent inverted steam generator is fed directly from a T-Stoff header tank. At the top left of the motor we can see the T-Stoff side of the fuel flow equalising unit, with the silver T-Stoff inlet pipe. The three stage delivery system is shown as the set of red pipes.

In the centre is the vertical turbine speed control unit. Linking this to other elements of the engine control system are the yellow coloured control rods.

On this "C" motor there is an additional unit below and to the right of the turbine speed control, the fuel flow and pressure equalising unit for the auxilliary combustion chamber - with a silver T-Stoff inlet pipe and a blue-coloured outlet.

Photographs © Shamus Reddin

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