France, the late 1950s. At SNECMA, engineers were building an aircraft with no wings you would recognise — no long span, no tail as anyone knew it, just a jet engine wrapped inside a great metal ring, designed to stand on its tail and rise straight into the sky.

They named it the Coléoptère — French for “beetle.” It was one of the boldest, strangest flying machines the jet age ever produced, and for a few weeks in 1959 it actually worked.

A wing shaped like a ring

The heart of the idea was the annular wing — a doughnut-shaped ring encircling the fuselage, conceived by the Austrian engineer Helmut von Zborowski. In theory the ring did three jobs at once: it acted as the lifting surface, it formed the aircraft’s structure, and it wrapped the engine in a smooth, drag-reducing shroud. Power came from a SNECMA Atar turbojet, the same family of engine that drove France’s Mirage fighters. The Coléoptère needed no runway at all — it would leap straight up, tip over into level flight, and land back on its tail.

It did not appear from nowhere. SNECMA had first tested the raw concept on the “Atar Volant,” a flying test rig that was little more than an engine on legs learning to balance in the air.

Standing on a column of thrust

Test pilot Auguste Morel first hovered the Coléoptère on a tether in April 1959, then cut it loose in early May and held the machine in a free hover for three and a half minutes — balanced on nothing but its own jet blast. Over the following weeks he flew it again and again, climbing to around 800 metres, coaxing more out of the beetle each time.

The killer was the transition. Lying on his back and pointing at the sky, the pilot had almost no natural reference to tell him what the aircraft was doing as it tried to tip from vertical to horizontal flight. It was, in the words used of every tail-sitter, like trying to land a rocket by feel — the same brutal problem that defeated America’s Convair XFY Pogo.

The ninth flight

On 25 July 1959, on its ninth flight, it all came apart. As Morel attempted a manoeuvre the Coléoptère began to rotate and oscillate; disoriented and low, he lost control and ejected, escaping with his life but serious injuries. The sole prototype was destroyed. A second was planned, but the money never came, and the beetle’s brief, brilliant career was over.

The annular wing never flew again. Helicopters and, later, jump-jets like the Harrier won the argument over how to take off without a runway. But the Coléoptère remains one of aviation’s great and beautiful “what ifs” — a very French piece of audacity that briefly, genuinely, stood on its tail and flew.

Sources: Musée de l’Air et de l’Espace; Vertipedia; Wikipedia.