• Source: Walter HWK 109-500

The Walter HWK 109-500 was a liquid-fuelled rocket engine developed by Walter in Germany during the Second World War.




Description


The 109-500 is a self-contained, modular monopropellant Starthilfe (take-off assist) engine in a pod, able to produce 500 kg (1,100 lb) thrust for thirty seconds. After the fuel was expended, the pod was jettisoned and it returned to earth by parachute, with the parachute packed externally, onto the blunt forward end of the pod.
The T-Stoff monopropellant, stored in the large spherical tank within the Starthilfe module's forward end, needed to react with a catalyst to provide the boosting thrust for an aircraft on takeoff - this Z-Stoff sodium or calcium-based, alkaline permanganate-compound (in an aqueous solution) catalyst was provided in a small tank above the reaction chamber just forward of the exhaust nozzle, with compressed air from a network of five pressure tanks driving the monopropellant and catalyst together through the reaction chamber, which featured an internal, fixed helical "swirl baffle" to lengthen the period of time the monopropellant and catalyst were in contact for a more complete catalytic reaction within it, before the reacted T-Stoff exhaust exited the nozzle.
It entered service in 1942, and some 6,000 were built, by Heinkel. It was "used extensively on a wide range of aircraft", especially the potentially underpowered (when heavily laden with external ordnance) Jumo 004-engined Arado Ar 234B, with two of the units uniquely displayed as mounted operationally on the NASM's sole surviving, restored Ar 234B.




Applications


Arado Ar 234
Blohm & Voss BV 138
Junkers Ju 88
Heinkel He 111
Messerschmitt Me 321
Messerschmitt Me 323




Specifications


Data from The race for Hitler's X-planes : Britain's 1945 mission to capture secret Luftwaffe technology, Die Deutsche Luftruestung 1933–1945 Vol.4 – Flugzeugtypen MIAG-Zeppelin



General characteristics

Type: Liquid propellant rocket
Length:
Diameter:
Dry weight: 125 kg (276 lb)
Loaded weight: 250 kg (550 lb)



Components

Compressor:
Combustors: catalytic decomposition of hydrogen peroxide (80% H2O2) in a single decomposition chamber without combustion.
Fuel type: T-Stoff monopropellant - (80% hydrogen peroxide oxidiser catalysed by Z-Stoff permanganate catalyst)



Performance

Maximum thrust: 4.90 kN (1,102 lbf)
Thrust-to-weight ratio: 2 loaded; 4 at exhaustion




See also


Walter HWK 109-507 guided ordnance booster rocket module

Related lists

List of aircraft engines
List of aircraft engines of Germany during World War II




Notes






External links



"Luftwaffe RATO engines - Walter HWK 500". You Tube. Retrieved 16 March 2018.
British 'Walterwerke' Reference Page on HWK 109-500 Starthilfe RATO Unit
Polish Aviation Museum online infopage on the uprated, experimental HWK 109-501 RATO booster

Kata Kunci Pencarian:

• Messerschmitt Me 262
• Arado Ar 234
• Henschel Hs 293
• Walter HWK 109-500
• Walter HWK 109-509
• Walter HWK 109-507
• Hellmuth Walter Kommanditgesellschaft
• Messerschmitt Me 323 Gigant
• Hydrogen peroxide
• T-Stoff
• Hellmuth Walter
• JATO
• Messerschmitt Me 163 Komet