I personally do not think this would be safe because of the following points...
1) You mention 270 degrees this would make the ride sideways surely? ???
Im going to assume you meant 180 degrees for the rest of this post as you mention inverted
2) If you are hanging upside down for any period of time blood will start to flow to your head leading to potential black outs
3) You mention hanging at the top for minutes, this would give the ride a bad capacity
4) You would have to have highly specialised restraints as if you are launching upwards it would put severe strain on them
This leads me to the conclusion that not only is it not viable it would also be very uncomfortable and dangerous
Last edited by Alex
on Fri Sep 06, 2013 12:16 pm, edited 1 time in total.