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Author Topic: Power and speed curves  (Read 3029 times)

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Offline wlindley us

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Power and speed curves
« on: August 11, 2012, 01:37:45 PM »
Also from my little Perl program that reads the dat files and can create various tables, comes this graph of power, tractive effort, and maximum speeds through the years of Pak128.Britain-Ex :


Offline jamespetts gb

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Re: Power and speed curves
« Reply #1 on: August 11, 2012, 01:41:32 PM »
Fascinating!

Edit: It'd be interesting to know what that looks like on a linear rather than logorithmic scale, too...

Offline wlindley us

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Re: Power and speed curves
« Reply #2 on: August 11, 2012, 01:47:31 PM »
Here is the linear scale. 

Offline jamespetts gb

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Re: Power and speed curves
« Reply #3 on: August 11, 2012, 01:53:32 PM »
Very interesting!

Offline ӔO

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Re: Power and speed curves
« Reply #4 on: August 11, 2012, 02:06:30 PM »
Would it be possible to give power-to-weight ratio and traction-to-weight?

It's interesting to see power goes up linearly, more or less. Speed goes up as log, as expected.

Offline wlindley us

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Re: Power and speed curves
« Reply #5 on: August 11, 2012, 02:26:47 PM »
Sure.

Offline ӔO

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Re: Power and speed curves
« Reply #6 on: August 11, 2012, 03:15:05 PM »
That's interesting.
I suspected the power/weight went up as a sigmoid, but I didn't expect traction/weight to be more or less linear.

Offline wlindley us

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Re: Power and speed curves
« Reply #7 on: August 11, 2012, 07:26:25 PM »
Somewhere in the data of the Britain paksets, is an entire college course ready to be written... a survey course, involving geography, sociology, technology, and economics perhaps?

Offline jamespetts gb

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Re: Power and speed curves
« Reply #8 on: August 11, 2012, 07:43:49 PM »
I should hope so (although the economics side of things definitely need much more work). I like to think that a side effect of playing this pakset will be actually learning about the history of transport!

Offline ӔO

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Re: Power and speed curves
« Reply #9 on: August 11, 2012, 10:49:27 PM »
what is also interesting, is that the traction/weight graph looks like japan.  :D