This is a fun little site that publishes "lists".
10 Of The Worst Jet Aircraft Of All Time
Rolls-Royce Thrust Measuring Rig
Just by looking at this airplane, you can tell that it was absurdly dangerous. The Rolls-Royce Thrust Measuring Rig (known colloquially as the “Flying Bedstead”) tested the feasibility of VTOL aircraft. It may not look like much, and that is because the Flying Bedstead was just two jet engines attached to a small frame. The airplane had no inherent stability. Rolls-Royce did not fit it with any sort of fuselage, wings, or control surfaces—just fuel tanks and engines with a pilot placed on top ...