Not precisely a supersonic aircraft as it crashed every time it came close to Mach 1, due to bad understanding of the physics involved. Eric Brown calls it one of the most dangerous aircraft he ever flew (over 350 different makes and models, not counting variants), but not as bad as the GAL glider - another swept-wing flying wing aircraft!
First Swallow had a subsonic wing of wood, the later version had a more advanced wing. This latter version killed many, including Geoffrey de Havilland himself, during an attempt to go supersonic! One of few aircraft with a better reputation than it deserves!
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