Douglas XB-42 Mixmaster
The Douglas Aircraft Company developed the XB-42 Mixmaster. This aircraft is an experimental bomber with a high max speed of 410 mph. Initially, this project was private before Douglas Aircraft Company proposed it to the United States Army Air Forces. The two parties signed a contract for the testing of two prototypes.
The Mixmaster, armed with machine guns, firing turrets, and a capacity for 8,000 lb of bombs, performed well in its first flight in 1944. Further testing identified faulty engine cooling among other problems.
After World War II, the Air Force felt less military urgency. The Mixmaster development stalled.
In 1948, the Air Force officially cancelled the Mixmaster aircraft.