The Jaguar had an astonishingly horrid thrust to weight ratio of 0.19:1 (lb/ft:lbs). Test pilot Corwin Corky
Meyer said it was entertaining to fly because there was so much wrong with it.
This ‘wrong-ness’ was generally caused by poor maintenance and assembly. Issues included the wing-pivot mechanism’s grease having a tendency to ‘gel up,’ the Westinghouse XJ-40’s unreliability, and, for a specific example, a 5-inch-long screw holding an instrument bank which marred the circuitry of the plane as it flew. Said screw was supposed to be 0.4 inches long. Ironically, the swing-wing was the only component reported to work flawlessly. The U.S. Navy eventually lost interest in this aircraft when they had a thought that probably read out like this: Say, lets just make a bigger boat—and put a ramp on it!
all things considered, I wonder if this, had it gone into service, could have beaten the Vought F7U Cutlass
for ‘worst track record.’