Kronach Lorin
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This small innovative ramjet engine was static tested in Austria during the latter stages of World War II. The engine's fuel supply consisted of approximately 300-400 lb of granular coal that was slowly burned inside a rotating metal mesh basket (ahead of the jet intake) to produce carbon monoxide gas as fuel. Theoretical flight time was 45 minutes. It was to be used in German interceptor planes Lippisch P.13a and Lippisch P.13b. Tested but never used in flight, the original idea was to produce an engine that could overcome coventional fuel shortage or disruption.