the boeing 247 was an advanced plane. the design was taken from the boeing monomail (models 200, 221, 221a) and the b-9 bomber. the boeing 247 was faster than the boeing p-12, which was the main american fighter at the time. the p-12 was did not have a roof on the cockpit, and it was a biplane. the boeing 247 landed at just 62 mph. this meant that flaps were not needed. at just 10 mph, the back wheel came off the ground, which made it easier to steer.