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30% Beryllium+Pentaborane in 70% Hydrazine
High performance fuel developed in Russia. Never flown due to toxicity. The concept of using beryllium and pentaborane in fuels for both rockets and advanced aircraft was popular in the early 1960's (so-called 'zip' fuels, as intended for the American B-70 bomber, for example). However while performance was improved by as much as 50%, the engine exhaust was toxic. No such engines ever reached production.



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