C-Stoff ("C substance") was a reductant used in bipropellant rocket fuels (as a fuel itself) developed by Hellmuth Walter Kommanditgesellschaft in Germany during World War II. It was developed for use with T-Stoff (a high test peroxide), as an oxidizer, which together with C-Stoff as the fuel, forms a hypergolic mixture.
|Methanol||CH3OH||~57% by Weight|
|Hydrazine hydrate||N2H4 · H2O||~30% by Weight|
|Water||H2O||~13% by Weight|
|Catalyst 431||K3[Cu(CN)4]||potassium-cuprous cyanide coordination complex|
The proportions of the components in C-Stoff were developed to catalyse the decomposition of T-Stoff, promote combustion with the oxygen released by the decomposition, and sustain uniform combustion through sufficient quantity of the highly reactive hydrazine. The combination of the C-Stoff, used as a rocket fuel, with the T-Stoff used as the oxidizer, often resulted in spontaneous explosion from their combined nature as a hypergolic fuel combination, necessitating strict hygiene in fueling operations; there were numerous catastrophic explosions of the Messerschmitt Me 163 aircraft that employed this fuel system. Another hazard was toxicity to humans of each of the propellants.
After the war, Allied studies into rocket propellants continued with engines such as the Armstrong Siddeley Beta, under the name "C-fuel".
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