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Model Railroading > Radius Question

Date: 11/03/08 11:58
Radius Question
Author: mstokinger

When laying, say, 22 inch radius curved HO track (or any other scale I guess), where does the track sit in relation to the circle that the curve sits on? In other words, is the radius measured from the centerline between the rails, the inner rail, the outer rail, someplace else?

Thanks.

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Date: 11/03/08 12:06
Re: Radius Question
Author: wabash2800

Centerline. A circle with a 22" radius would be 44" from track centerline on one side of the circle to the other track cenerline.

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Date: 11/03/08 12:11
Radius, next Question
Author: TopcoatSmith

If you have a curve that measures 575 feet from radius point to centerline (in 90 degrees), what does that convert to in HO scale ?
I added it up the way I think it's supposed to work and I know I'm wrong so I ask you.


TCS - missing an important piece of the puzzle

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Date: 11/03/08 12:14
Re: Radius, next Question
Author: wabash2800

Convert to your final product, inches:

575 x 12 = 6900" 6900"/87.1=79.22" for radius in HO and double that would be the inches for the full diameter cricle, track center to track center.

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Date: 11/03/08 12:52
Re: Radius Question
Author: mstokinger

wabash2800 Wrote:
-------------------------------------------------------
> Centerline. A circle with a 22" radius would be
> 44" from track centerline on one side of the
> circle to the other track cenerline.


That's what I thought. Thank you!

Mike

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Date: 11/03/08 13:43
Re: Radius, next Question
Author: TopcoatSmith

wabash2800 Wrote:
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> Convert to your final product, inches:

That's what I came up with so my starting numbers are wrong. My final hope is the track charts my friend is looking for.


TCS - hmmm (cornfusion, I thought Redondo Jct was a tight curve)

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Date: 11/03/08 16:29
Re: Radius, next Question
Author: pmack

80" rad in HO is still a 10 degree curve.

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Date: 11/04/08 19:25
Re: Radius, next Question
Author: TopcoatSmith

pmack Wrote:
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> 80" rad in HO is still a 10 degree curve.

It is indeed, Redondo Jct just looks tighter than that but ya can't argue with blueprints.


TCS - cuz they won't argue back.

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