The airbag inertia firing mechanism would probably have to be left alone, lest you accidentally set it off in your face while tinkering with it. I think they fire with an explosive charge and quickly deflate (unsure?) so you really wouldn't be able to time it right for impact with a thumb switch, you'd fire it too soon or too late and make the situation much worse. However, its designed to fire right at impact so you shouldn't have to change a thing. In a GA cockpit it probably would work ok, if you chose one to fit the size of your cockpit. In an ultralight I don't know how effective it would be, as there is nothing to the front or sides really to constrain it. It may work just fine anyway, who knows. I'd sacrifice a few test installed in my target application (if I could get them free) with a test dummy before flying hot with one installed, just to see what it did to the dummy. Speaking to people that have been in wrecks and had airbags deploy on them, having an airbag deploy on you is not a fun experience... it literally smacks you in the face/chest and hurts pretty bad... *but*.. its WAYYY better than eating the steering wheel or the glass with your face.... and in all cases, it worked as designed... saved their lives, and saved them from a lot worse injury. ~ You could fill your soda/beer cans with Great Stuff (tm) of different densities, or packing peanuts? Brainstorming, have no idea if either is a bad or worthless idea. Experiment with a filler material, then smash em with a sledge hammer and see how they react. ~ Thanks for the info on the helmet cable, I had the same idea but didn't know if anyone had done it before. I'll have to look into what race car drivers use, and what quick detach mechanism. I've been on rollercoasters that do multiple loops, and made the mistake of looking down before entering a LOOP... not a fun experience... the centrifugal force pins your head down and you can't lift it at all nor your arms and it don't feel good at all... downright painful and nauseating actually.