Building A Roller Coaster With Cardboard And Duct Tape What Is The Needed Angle Or Rise/run For A Roller Coaster To Do A Vertical Loop?

What is the needed angle or rise/run for a roller coaster to do a vertical loop? - building a roller coaster with cardboard and duct tape

That is a ridiculous 6th Class science-class "rollercoaster", a project that is a parent project. I have a brain injury, and everything I find online instructions provide for a project team - but no help, with the exception of the ideas, physical or complicated calculations. We are not allowed to go and a lot of money for this project. We should be able to do with things around the house. HAHAHA! We used cardboard, straw and drain cleaners and duct tape. This works fine until we hit the part of the vertical loop. We have tried to enclose the loop, but we strive to build a long-term, where the fragments do not cause bumps, etc. slow the ball down.

Therefore need to help them understand some kind of cheapRefer to the equipment, the guidelines could be used to meet long-term development in order to keep up the momentum. We must also understand the place and run, so that the ball will continue. The others are either.