With increasing NT, the coasting force that wants to turn the front part backward will increase as well - most probably much more than the centering force, thus easily zeroing this force out.
But why this? The python has proved that the self-centering effect is stronger than the stabilizing effect induced by positive trail. What is the reason for you to think that this coasting force will suddenly take over and increase in force much faster than the self centering effect?
Self-centering force does not change its value or even decreases when coasting downhill. Coasting force is growing with the speed. So at a specific speed both forces get equal and with more speed the coasting force finally takes over.
I wish some ingenious physicist will join this list and help us calculating
these effects ;-)
I hope to become an ingenious physicist in time ;) As I said earlier, I think this is a great subject for my thesis next year, so with some luck I'll find something useful then :)
Looking forward to this ...
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