this sounds like a cool idea jonno, could be what we need to move forward, craigs idea about the parachute is brilliant, when i first read this the first thing that rang alarm bells was the net roofing, but if we have that resolved obviously there will be other safety aspects we will have to fix/improve, and it will be interesting to see if the fra will let this happen,

as far as limiting the spinner goes, apart from being horizontal, will there be any rpm/motor/voltage restrictions? i have a few spare motors lying around (litton, bosch etc) that i could use...i also have a spare disk so this could be a plausible summer progect

the idea of sacraficial armor is good too, hdpe or wood, loosly held on with velcro or a few bolts, the crowd would love it

also, would featherweight spinners be allowed? it would be good to get them out more often

jack