This illustration shows the top view of the Walter 109-509.A-1 motor on display in Gallery 113, Rocketry and Space Flight, of the National Air and Space Museum in Washington DC.

Below are shown, in isolation, the individual components that make up the motor system.

For a detailed, annotated diagramme of the Walter HWK 109-509.A-2 which shows all the parts and piping, follow this link.

All photographs © Shamus Reddin

The main Propellant Flow Regulating Valve - "Regelgerät". This is a propellant flow and pressure equalising unit, arranged in three stages, which each come into play following movements of the pilot's throttle.

For a detailed overview of this part, follow this link.

C-Stoff Control Valve - "Steuereinrichtung". This control valve is operated by the pilot's throttle and sets the flow of C-Stoff, hydrazine hydrate propellant, to the combustion chamber, and effectively sets the power output of the motor.

It is also mechanically linked to the mechanism which meters the flow of peroxide to the steam generator, thus controlling the speed of the turbine, the pressure and flow of propellants and so ultimately the motor's power.

For a detailed overview of this part, follow this link.

The Fuel Filter - "C-Stoffsieb". C-Stoff returned from the cooling jacket surrounding the combustion chamber (flowing from the right of the picture here, to the left) is filtered to remove any debris, before passing into the main control valve.

For an overview of this part, follow this link.

Turbine Speed Control Unit - "Druckregler". This unit is linked mechanically to the propellant control valve on the opposite side of the motor. It controls the amount of T-Stoff delivered to the steam generator, thus affecting the speed of the propellant pump turbine, and so the power output of the motor.

For a detailed overview of this section, follow this link.

Steam Generator - "Dampferzeuger". T-Stoff is sprayed onto a catalyst base, steam is generated and this is used to power the propellant pump turbine.

For more detailed information, follow this steam link.

Propellant Turbo Pump - "Turbopumpensatz". Not shown on the illustration above is the steam powered turbo pump, which drives the propellants around the motor.

For more detailed information, follow this pump link.

The Combustion Chamber - "Brennkammer". Also not shown on any of the illustrations above is the main thrust unit of the motor, the combustion chamber. propellants metered and driven around the system, finally mix in their correct ratios in the combustion chamber, to produce the thrust needed to power the airframe.

For more detailed information, follow this combustion chamber link.

The Propellant Injectors/Burners - "Düsen". Difficult to show on the illustrations above is the point at which the motor's thrust develops, the propellant injectors or burners within the combustion chamber. propellants are mixed in their correct ratios in the combustion chamber, in a fine atomised spray, producing the chemical reaction which generates the thrust.

For more detailed information, follow this injector link.

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