#yc-15

Seen in this photo is the Douglas YC-15. The aircraft was designed to take off in less that 1000 feet while carrying a full load. The really cool thing about this aircraft is that engine exhaust is diverted through the wing and diverted downward over the flaps. This blown flap design allows the the flow to remain attached at very high angles of attack, allowing the wing to produce somewhere between three and five times the maximum lift possible compared to a "standard" wing. The idea behind it was understood for some time before the aircraft was built, but was not that feasible until high-bypass engines were common due to the high temperature of gas produced by lower bypass engines.