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Topic: Overhauled physics model (Read 24291 times) previous topic - next topic

Re: Overhauled physics model

Reply #35 –
I want to point out that with higher RPM diesel engines become less efficient, too, but maybe less than the steam engines.

Some types of electrical motors also become less efficient with higher RPM, but this depends much on the construction and motor control, so it might be irrelevant for trains.

For diesel and steam engines I was under the impression that it's less the power output that limits the top speed, but gear factors and max. useable rpm of the motor.

So I'm confused why people always try to calculate top speed based on power.

Re: Overhauled physics model

Reply #36 –
Hajo,

interesting thoughts. What are useful formulae for calculating those factors?
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Re: Overhauled physics model

Reply #37 –
In old Simutrans I used something very simple, power-based accelleration and a hard cap for top speed. Prissi then refined this into a more detailed model. I still don't know what would be "right", but I think school physics f=m*a (force is m**** multiplied by acceleration) doesn't really cover the problem.