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Bachmann On30 turn radius
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 Posted: Thu Mar 16th, 2017 09:35 pm
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Helmut F
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I kinda want to know for all of them!  :bg:  I know Bachmann puts numbers on their web site, but some locos are already gone from their web site and are those the real numbers?  Maybe this thread could serve as a reference if I can dig up all these numbers.  I will fill this in as I get data, and hope some of you know some if this from your own experience.

I have read somewhere the Porters are 6"?

0-4-0 Porter  6"? (Bachmann says 18")
0-4-2 Porter  - 18"
0-4-0 Side Rod Gas  -
4-4-0 American (outside frame) - 18"
4-4-0 American (inside frame) -
2-6-0 Mogul  - 18"
4-6-0 Ten Wheeler  - 18"
2-8-0 Consolidation -
2-4-4-2 Articulated  - 18"
2-6-6-2 Articulated  - 18"
2-4-4 Forney  - 22"
2 truck Shay  - 18"
2 truck Climax  -
2 truck Stearns-Heisler  - 15"
Rail Bus  - 18"
Rail Truck  -
50 ton Center Cab Whitcomb  - 15"

If I am missing any let me know, and if you have the data also please let me know.

And then in researching I find this:

http://www.npcrr.net/On30/On30Loco_n_Car_Radius_pics.pdf

Can anyone validate/refute the data in that PDF?

Can anything be done to allow tighter curve radius on any models?



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 Posted: Thu Mar 16th, 2017 10:33 pm
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southpier
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just like the "all you can eat buffet", just because you can, should you?

spreading gauge can offset some tightness, but i think with that comes coupling and derailment possibilities.

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 Posted: Thu Mar 16th, 2017 10:40 pm
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Helmut F
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I could limit my question to those I am particularly interested in right now, yes. But if this can be a reference for others as well, why not? Yes, some may go eternally unanswered though.



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 Posted: Thu Mar 16th, 2017 11:12 pm
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oztrainz
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Hi Helmut,
The information is correct and verified provided that you read the front page. It was originally collected and verified by some of the members in the On30Conspiracy Yahoo Group.

The radius in the first column will work "out of the box". You can get down to the radius in the second column (which is the very ragged end of the minimum radius envelope). EVERYTHING has to be right - couplings, track (no kinks), wheels, axles, etc...

READ and UNDERSTAND the Notes that are attached to some of these locos/wagons. These Notes will give clues on what you have to do to go tighter than the first or "Minimum Recommended Radius".  
When you start and push the envelope with minimum radii things like coupler overhangs and flexibility are additional complications that have to be worked through. 



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 Posted: Fri Mar 17th, 2017 12:42 am
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Helmut F
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thx John, yeah I saw all the specific model notes.



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 Posted: Fri Mar 17th, 2017 11:17 am
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Kitbash0n30
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Helmut F wrote: 0-4-2 Porter  - 18"
Mine will do 9 for near-absolute minimum. Could go tighter with frame modification, trimming interfering part.

I use very long shank Kadees to allow that, a thing inspired by traction's radial couplers.



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 Posted: Fri Mar 17th, 2017 05:10 pm
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Reg H
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If you are going to run minimum radii you also need to be mindful of clearances.
On my 24" radius curves the pilots on my consolidations swing WAY out.  
Frankly, I wish I had had the room to do 36" radius curves. 
Reg



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 Posted: Fri Mar 17th, 2017 05:19 pm
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Helmut F
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Kitbash and Reg,
thx. appreciated. as soon as I have time I will transpose the data from the pdf into the post text itself with some appropriate warnings.

I do not have any Consolidations and they just do not seem to be available any more, so I will probably not have to worry about that (too bad, I really like them). I am looking at mostly Americans and Moguls and probably Heislers/Shays and Porters.



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 Posted: Fri Mar 17th, 2017 05:44 pm
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Kitbash0n30
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Oh, Helmut, there are some unexpected HO mechanisms which unmodified can take down to 9 inch radius curves.
The old bluebox Athearn SW7 which was mislabeled as SW1500.
From Bachmann;
The USRA 0-6-0; the GP40; and the Fairbanks H16-44
videos:
Fairbanks,


0-6-0,

Years ago elsewhere on the web I got some know it alls really really mad at me when after they emphatically declared to some newbie the Bachmann HO 0-6-0 was incapable of taking less than 15 to 18 inch curves I called B.S. on them and posted those videos.
I was quite pleased with me. :)



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 Posted: Fri Mar 17th, 2017 09:25 pm
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Lee B
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I have never gotten past how people so often want to know how tight a curve you can put an On30 locomotive on without it derailing. Frankly, I wonder if you could actually put a Bachmann ten-wheeler on an 18” curve. I have 24” curves on my mainline (and also wish I could have gone as wide as 36” or wider but I’d never have made it to the current end of track if I had to use curves that big due to things in the room) and even then they look awfully tight. One non-mainline curve is somewhere between 22 and 21” and my ten-wheelers have to have their tenders set to the furthest position on the drawbars.
Then again, I didn’t get into On30 because of very tight curves. I got into it as Bachmann made the loco I wanted. If someone else had made the ET&WNC Baldwin 4-6-0s in, say, On3, I’d have bought some in that gauge…



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