Yeah, I realize the permanent bleeding of exhaust for inflation and a relief hole at the tail apex is a bad idea. However, the exhaust bleed is only used for inflation (of a conical tail without a hole at the apex), and then the bleed is shut off, it might not affect the the engine at all during (rest of) the run.
In any case the jack-operated retractable version with no inflation (mechanically held in place) gets rid of all issues pertaining to inflation.
Seeing inflation is such an easy answer to the problem of putting together a collapsible structure, having those options go out the window on points sucks
