http://www.designfax.net/enews/20101123/feature-3.asp

Over-the-wing (engine) placement is a key design element because
it enables very high lift while still providing the engine thrust necessary for
take-off and high-speed level flight. It also offers important reduced-noise
benefits.

...single wing flap is used in tandem with a novel element based on
circulation-control technology. A narrow slot, capable of pneumatically blowing
out air, runs along the entire trailing edge of each wing, just above the flap.
This system is powered by its own compressed air source located inside the wing.

This procedure, called flap-blowing, performs two functions: it increases air
velocity over the top of the wing, and it deflects the ambient wind stream
downward so that it curls under the wing. The combined forces generate a lift
coefficient that can be two to four times higher than a conventional mechanical
flap.

During take-off and landing, air flow from the slot interacts with the engine
exhaust and pulls this powerful exhaust blast down onto the wing. This process,
called entraining the exhaust, greatly increases the velocity of the air passing
over the wing and results in highly augmented upward suction and lift.

"This strategy allows an aircraft to be flying at a very low speed, while the
wing is seeing much higher relative wind speeds on its curved upper surface due
to this blowing and thrust-entraining combination," Englar says. "We have
measured lift coefficients between 8.0 and 10.0 on these pneumatic powered-lift
wings at a level flight condition during testing. The normal lift coefficient on
a conventional wing at a similar flight condition is less than 1.0."