Since we have reached a point where wheel manufacturers claim that in certain crosswind conditions their wheels actually provide forward thrust, why cannot this be replicated with frame tube shapes for tandems since we are not restricted by UCI rules like road bikes.

Since the tube shapes are not available could they just be 3d printed?

To take this to the extreme could a panel be added to inside the frame triangle that acted as a sail?

While on the subject of 3d printing why not print a monocoque (sp?)frame? Unlimited design possibilities, could even add golf ball dimples all the way around???

Just trying to start a winter discussion and as per Pateka these ideas are Patent Pending ;-)