Is co-flow jet wing technology workable?
Amazing! British pioneer JW Dunne proposed this as a propulsion system around 1901 but Sir Hiram Maxim told him it would not work. (ref. unpublished documents in the Science Museum Archive's Dunne collection). Nine years later Henri Coanda built a ducted &quot;jet&quot; plane on broadly similar principles, which failed miserably (The Wikipedia article is not very good, but I know of none better online). But they all failed to understand the opportunities for suction lift, instead trying to exploit it to entrain a greater volume of air and create thrust.
More modern blown-wing systems have tried to improve on suction lift using similar methods, but have always foundered on the power requirements for the blower and structural weight penalties of all that wing ducting.
Here is a PDF from their web site. It appears to achieve high lift/STOL performance through high AoA and the Coanda effect, basically turning itself into a giant blown flap. Alternatively it provides modest forward thrust by stimulating circulation and thus maintaining lift at a slight negative AoA.
Well, it probably does work - see wind tunnel images - but I would also want to see those wing weights, blower power figures and cost-benefit analyses before believing it is any more practicable than yesterday's approach.