Frank,
Name sounds close. I did visit Richard Miller in that back house; he had scores of models of hang gliders and sailplanes he made. I don't recall the spar you mention.
However, inflated air beams have many possibilities. I explored my "cavexion" spars from 6 in diameter up to some beams of 3 ft. diameter; these were explored first for high jump landing cushion.
Air beams my have interior webs in various configurations. One of my favorite explorations is an encasement that holds two bladders that squeezes a span-wise coilable thin-plate of epoxy carbon fiber veener; the two bladders are positively inflated, but held to maximum size by the strength of the encasement; the encasement need not be non-porous. as it does not need to hold air, but only hold the two bladders. The squeezed web holds positive and negative flight forces in the vertical plane. The coilable web permits bus-ability; the bladders and encasement form busable totes. Using the anti-torsion of the air beam permits placement of airfoil ribs. The aim is to sack-skin the full span and use the air beam to hold back the compression of the tensioned sack skin. Sack skin could be zippered or corded laced at the center of the wing.
- sketchAirBeamTwoBladdersWeb.png (5.78 KiB) Viewed 23597 times
- sketchAirBeamTwoBladdersWebCombinedSplintsCabled.png (9.73 KiB) Viewed 23597 times
The grasp of the stationed ribs could permit graduated placement to give Culver Twist washout for flying wing solution. But exterior "high-hat" "tailing" is hoped for one solution for some pitch stability. First aim is Handy Dandy Dockweiler Positive-Inflated-Spar Busable package.
The ancient splinting of fluid beams (legs, arms, etc.) modernized in coined Tensairity (they don't own the principle which is in public domain, but they coined well a working business name) uses exterior compression member along with tension cables in skin of air beam:
Combining that with the above-mentioned web in air beam provides a direction for some super spars that may pack and tote to solve busable HG spars.
See also:
https://en.wikipedia.org/wiki/Tensairity and its interior links.