I saw this video that NASA posted, which presents the idea of putting several small propellers on a wing:
They claim that by doing this you can force air to blow over the wing more quickly. This would make the wings act as if the aircraft was flying faster than it really was, resulting in shorter takeoffs and more control on landings.
However while watching the video I kept thinking, wouldn't the turbulence and slipstreams caused by the propellers actually make the wings perform worse? Or at least neutralize the proposed added lift and control?
Having no fresh airflow over the wings seems like a problem. Have any aircraft ever tried this concept before with successful results?