An ok-quality youtube documentary on the Inflatoplane (it caused me to twitch a few times, such as when the “airmat” material was several times called “airman” for some reason). The Inflatoplane was pitched as a way to rescue downed pilots, a role it could still serve. Also potentially useful as  a way to infil/exfil special ops forces; if it could be made practical with a quiet propulsion system (electric motors? distributed propulsion?), then it could probably be *really* good for that role. At the end of the mission it could be fairly easily destroyed to keep it out of enemy hands. Another proposed role was as a light aircraft for the commercial market; this one I’m less thrilled about. A rubber aircraft would be necessarily not a long-lived aircraft; basic wear and tear, everything from scraping on the ground to repeated inflations, temperature cycling and ultraviolet light would cause the rubber to degrade over time. if the rubber parts could be made *really* cheap – a few grand, perhaps – such that the owner could swap out the rubber bits and retain easily-swappable propulsion, controls,  avionics, seats and such, then maybe it would be ok. Might make a dandy battlefield recon/ missile platform if made to be unmanned… a sizable aircraft with a decent payload that is small on radar and IR, difficult to shoot down shot of a direct hit, and dirt cheap. Replace the original nylon and rubber in the original airmat material with kevlar, carbon fiber and, say, teflon, and you could have a *really* tough little airplane you could fold up and stuff into the back of a car. Might be interesting to study the design pressurized not with carbon dioxide and water vapor engine exhaust, by *hydrogen* for added lift. Sure, it’d be a risk of catching fire, but if enemy action is already poking it full of holes it’s lost anyway. Might as well have it burn up before the enemy can get to it.