What a Concept, How Many Engines?
 

A model, granted, but what a concept!

You Tube

Wow
Perfect xMass gift for an old B52 pilot!

How do the rudders work?

No rudders, just plain vertical stabilizers. Yaw control is via asymmetric thrust across the 9 motors - kinda like the DC-10 in Sioux City. Yaw signal from the "pilot's" RC box throttles up left engines and throttles down right engines to yaw right and vice versa, by way of the programming of the digital flight controllers on each of the 9 part-planes.

Differential elevator across all 9 aircraft for roll control - the elevators act as "trim tabs" to change the wings' angle of attack on the left and right sides. Some lateral roll stability built-in by angling the hinge connections between the wingtips - if one individual aircraft tries to nose up or down, the hinge geometry tends to push it back to nose-level and in line with the others.

If you watch the whole video, at the end there is a link to an "explainer" video that discusses the controls and construction.

Some airplanes are fondly described as "a large group of spare parts flying in close formation." ;) This is the ultimate poster child for that concept.

I'm kinda interested in the airfoil - which seems to be just the proverbial "barn board," except with an additional wrapping or layer around the leading edge to provide a little camber ------===

That's going to be a handful when it reverts to direct law.

Hard to say, but what it looks like from his "explainer" video, is there's really no camber at all, the wing looks like just a piece of rigid foam core board with the leading edge rounded a bit. Same thickness from leading edge to trailing edge.

:) :) :) - Watching the "explainer" video, It occurred to me I'd love to have this guy explain the Airbus laws. While a bit of a hemmer and hawer, he does illustrate his points well.

Oh look! Here is a much bigger one: