Summary

A good clock for Science Olympiad, you need a couple of screws, a wieght and dowels, and you need to build a platform for the clock itself to mount on. In order to figure out the times you must run a couple of trials and make an equation.

The most important part is the pendulum bottom. you need to stop it before it dies the top layer, then add some weights to it.
Most of this design is from my previous one, so refer to that when you build
I used a 400-gram weight for power
https://youtu.be/tb9zVjolr2M