yep thats right! me and my friend have been considering building a small backyard coaster. my idea was to make a slightly steeper wooden version of the butterfly. http://www.rcdb.com/2703.htm?p=11887
we will probably use scooter wheels and a winch lift system. I have a pushbar from an old mower which makes a perfect restraint. It will have one passenger at a time. it will be approximately 15 ft tall.
Questions? Comments? Advice?