My model IV had one but with the lightweight 582 engine it made the plane tail heavy so was removed.

It was set-up to fire out the belly just between the header tank and seat back. The bridle was then routed up the right side of the fuselage where it would rip off the turtledeck and suspend the cabin at the four wing attach points.

I'll be wearing an emergency rig for initial test flight which should be soon. I hope.

jon