Project of jet powered aircraft, 1864.
Triangular solid thin wing with 450 swept leading edge and straight trailing edge.
Cylindrical fuselage with conical nose and small tail plane.
Engine - pulse jet.
"Delta" was at least 75 years ahead its time, so it hardly could be accepted by aeronautical
society at the time of creation. It was an age of balloons and early gliders.
Both aircraft and engine were patented in France (1867)...