The Fairey Battle
The British Royal Air Force banked a lot on the engine of this plane. They put down a lot of money just for it to become a flying piece of garbage. It was sluggish, heavy, and easily destroyed during battle.
The Douglas TBD Devastator
The Douglas TBD Devastator was supposed to be the end-all in fighter planes. Sadly, it was more of a sitting duck. The only time it could fire torpedos is if the plane was flying perfectly straight and at exactly 115 mph.