Ask The Experts
General Category => Ask the Experts => Topic started by: Rich Curtis on March 13, 2019, 08:51:06 AM
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Regarding the stuff about temp rails:
The geometry is wrong. The rationale is asinine. The posts are ridiculous.
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I looked at the post. I don’t put any weight on the angle, but not sure I understand the geometry being wrong point. If you increase the circumference of the oval, wouldn’t you be increasing the length of the turn?
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Yes, but that is not the bad geometry. The bad geometry is here:
\"Being the speed would presumably allow you a rail trip......the bigger the turn(s) the bigger the advantage that would provide.\"
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Correct. And a lot of people get that one wrong when they first look at it.
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I still don’t get it. I’ll use round numbers to keep it simple:
First scenario- no temporary rails. Rail trip on turn is 500 ft. A 2 wide trip is 10% further, so 550 ft. Stretch run is 500 feet for a total of 1000 ft traveled for rail horse, 1050 for 2 path.
2nd scenario - temp rails. Rail trip on turn is 600 ft. A 2 wide trip is 10% further, so 660 feet. Stretch is 400 feet for a total of 1000 ft for rail horse, 1060 for 2 path.
Scenario two is more beneficial for horse on the rail, relative to horses not on rail.
I’m not a math guy, so maybe i’m thinking about this incorrectly?
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It’s not 10% further. It’s pi times radius further. The additional radius is the width of a path, and that’s true no matter the size of the turn. So the additional distance travelled is the same regardless, about a length.
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Ah, thanks for the explanation. I should have paid more attention in geometry.