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In page Arado Ar 234 Blitz:

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During October 1944, the prototype Ar 234 V19 performed its first flight.[3] Although an operational test squadron was being prepared, only 14 C-series airframes were completed by the end of the war, with fewer than half having engines. Some were found at the end of the war sitting in the open, complete but for empty engine nacelles.[a]. Flight testing of the new sub-type hadn't started yet when Germany surrendered. Three basic variants of the C-series were planned, with several more laid out as detailed proposals. Some of these would have had a pair of the higher thrust, but 950 kg (2,090 lb) heavier Heinkel HeS 011 jet engines, while others were to have swept or "crescent"-type wings.[citation needed]