The Heinkel He-162
This plane nearly broke records with how quickly it was designed and produced- in fact, it was finished in 90 days. Unfortunately, this plane was made out of wood and the pilots were all teenagers! It was the kind of plane that really needed to be handled with care, but the glue that held it together was not strong enough to withstand flying conditions. It was only used for four months, from January until May of 1945.
The Fairey Battle
This Rolls-Royce Merlin piston-engined plane had a lot of high hopes when it was designed for the British Royal Air Force in the 1930s. Unfortunately, the plane turned out to be far too slow and way too heavy to ever work out properly. In just one week of use, about 100 of these planes got shot down, and by the end of 1940, the Royal Air Force retired the plane.