The orange blur in the pic above is a Slot-it Porsche going around a home-made 45degree banked corner at 5m/s (16.4feet/sec). To my surprise it makes no difference if you remove the magnet. It still goes around at 5m/s!
This got me thinking. How much lateral friction do you need to go around a banked corner?
I crunched a few numbers and got a theoretical answer: in the above scenario you need a coefficient of friction of 0.6
This is a very low number. Even if you double it, it’s easily achieved. Decent tyres give more like 2.0
So why did I spend so much time gluing steel wires under the copper foil? A waste of time. Live and learn!
Here’s a graph showing some other data points. The data point for the Porsche is arrowed.
Thanks for reading!
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