The Heinkel He-162
This plan ewas made so fast and surprised everyone when it was ready in just 90 days. It was made from wood and the pilots were teenagers. The glue that kept the plane together was not strong enough for flying circumstances. It remained in the air for five short months.
The Fairey Battle
While there were many high expectations when it came to the Rolls-Royce Merlin piston-engined plane, it was created for the British Royal Air Force in the 1930s. It was way too slow and far too heavy. After one week, 100 were shot down and the Royal Air Force stopped using the plane.