Nice. I think, from what I recall, the engineering challenges are heat build up, weight (more than a regular tire), and bump absorption.

Yes, yes and no so much anymore. The delamination / damage from bumps and potholes have been pretty much resolved in the Michelin and Bridgestone designs (according to Michelin and Bridgestone - ahem...) Haven't seen any reports on whether running temps are worse lately, but hard to make the comparison (the #1 root cause of tire failure today is under-inflation so tires running hotter than design). Now with 10 or more of the big boys in the hunt for the best airless design, will be an interesting ride. The concept out of SciTech Industries in Florida is neato, but they are a (relatively) smaller startup, so might get lost in the scramble, though producing a lighter tire with less heat build (quite a different concept compared to Michelin). cheers

Thank you!
I would assume the military demand for this would be rapid and eager.

Um? What about driving through water? Snow? Loose gravel? I have to imagine that they are going to pick up and potentially throw loose material in odd ways. I am all for the airless tires but I am pretty sure they haven't engineered a way to avoid the need for sidewalls.

As someone who lives in cold climates for half the year I would love tires that don't require air pressure anymore. Especially since my TPMS system just died recently and now I have to replace it.