Novel "Wrap-it" stove on KS: discuss?

One of those small-world things:

The reference in Peter’s earlier post was by Dale Andreatta, who was there when I met my wife on a gourmet backpacking trip in 1992 – he helped carry my hot tub 6 miles in to Wildcat Camp at Point Reyes.  Dale was developing solar pasteurization and later cleaner-burning stoves for the third world.  “The guy who (later) killed Pluto” and the first human to entangle more than two photons were also there, but Dale’s activities have presumably saved more lives.

A few follow ups:

• Promised video of how the Flux wrap survives multiple wraps https://youtu.be/56gPyMvhlUM
• The above video also explains how we can achieve secondary burn with little overhead (there is some secondary air flow along the Flux Wrap surface – inside and outside even without the 2nd Flux Wrap)
• You can read and see a short video on thermal cycle testing on the Kickstarter page.
• Dale Andreattas’ work is understated and deserves more publicity. https://www.conservationmagazine.org/2011/06/to-build-a-better-fire/  David Thomas you were indeed fortunate to meet him. The fact he help carry your  “hot tube” also speaks volumes about the man. Have to ask…How do you square talking about carrying a “hot tab” on Backpacking Light?  :)
• Also can’t help myself…The fin calculation is not appropriate for a single surface when the other side of the surface is heated.

Peter:  I suspect I’ve developed one of the lightest hot tubs to be carried 12 miles over trails.  UL is all relative.  Some of you bring a big camera or a camp chair as your “luxury item”.  Mine’s just a bit more luxurious.

A Dale story:  Several of us started caving through the Cal Hiking And Outdoor Society (CHAOS, formerly the UC Hiking Club) around 1990.  Later we connected the Diablo Grotto of the NSS and went through proper channels, but we had good enough directions to Empire Cave near UC Santa Cruz and another one, IXL Cave.  There was a tight squeeze mid-way in IXL.  I could get though (at that time) okay, but it was tight.  Smaller people zipped through.  As hard as Dale tried, he was just too big of a guy to get through.  We decided to rate caves in milliDales, with that passage being about 950 milliDales.

I think he was an ME PhD student while at Berkeley.  I was ChemE.  He was trying to develop a better tube-in-tube heat exchanger for his water pasteurization systems (once the water is hot, it’s pasteurized, so it could be used to pre-heat additional raw water).  He was imagining fins or small-diameter corrugated pipe, but I proposed that there’s something readily available, everywhere, for cheap, that would work: sand.  By filling the outer tube with coarse sand, you avoid laminar flow of the water and get much better mixing near the HX surface with water away from the surface.   Dale tried it in his lab and it doubled his heat recovery.