Bristol Brabazon

One was built. Eight engines driving four pairs of contra-rotating propellers, a fuselage as wide as a 767's, and a cabin laid out for a hundred people in ocean-liner comfort — a design for a market that had already stopped existing. No type certificate for it is reachable — the FAA's regulatory system is closed to us and EASA never held the type — so this entry carries its history but none of the certified weights the rest of the library is built on.