On Friday, July 6, 2018 at 12:30:14 AM UTC+10, wrote:
Is this the one that used a lawn tractor inner tube or similar folded in half? I remember one posted here on RAS that looked simple, cheap and effective - a rare combination.

You know, I never thought to ask Paul what the bladder came from. I assumed it was folded up from rubber sheets and glued. But Paul did own an industrial vehicle related business, so it could well have adapted an inner tube of some kind.

The last time I saw him demo it was with him sitting in a PIK-20. Up he went to just about the sill of the cockpit, then just rolled out.

I know that the gas bottles were something commonly available - drink syphon refills I think.

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