How do you build a simple roller coaster?

Question

my middle schooler has to build a simple roller coaster (a workable one) with three hills, a loop or a curve and a large hill....she is trying to come up with materials to use...she tried posterboard and packing tape to build a track with tall sides so the marble doesn't shoot off the track and has been attempting to do this for a week now but that isn't working ..we bought plastic closed tubing and are not sure how to support the darned stuff....is there anything that is pliable yet lightweight (that a marble could roll thru) which doesn't require a uhaul to transport to school?

Answer 1

I had a set as a child that used two thin 'rails' of narrow rubber tube, about the size of air tubes for fish tanks, to support a marble.

Air tube is cheap / light / flexible, too. You can use dowels to support it into the main shapes, and glue toothpicks every inch or two along the track's length to maintain the spacing.

-Edit-

Tried to add a link before, but couldn't post. The product I had as a child was called 'Spacewarp' by Bandai or Blackwolf

Answer 2

Explain yourself ight what a real coster??