HP 4-6-6-4 Articulated

HP 4-6-6-4 Articulated

Postby areibel » Mon Nov 23, 2009 9:41 pm

HP 4-6-6-4 (OK, for now it's an 0-6-6-0!), but she needs a little freshening. The HP Articulated had all the drivers powered with a single DC60 through a power train shown below. It's shown with the HP #5000 "Long Haul" Tender with six wheel trucks.
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Re: HP 4-6-6-4 Articulated

Postby Murad » Sun Feb 05, 2012 11:42 am

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Last edited by Murad on Mon Feb 06, 2012 5:54 am, edited 1 time in total.
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Re: HP 4-6-6-4 Articulated

Postby railtwister » Mon Feb 06, 2012 1:01 am

I need a large diameter worm that looks like the one pictured on the articulated. Does anyone know if it's double-cut? With that large of a diameter, I'm wondering. I can't remember which loco it is that I have that needs it, but I think it's a smaller one, like a Docksider or an 0-6-0. I'll have to dig up the TT box out in the train room to refresh my memory...

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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Fri Apr 13, 2012 11:07 am

Our HP Challenger came in this morning.

When we are able to find which box my measuring caliper came in, we will take measurements and post.

The locomotive itself is just over 7" long. The tender ours came with is the #4900 8-wheel tender, vice the more typical and proportional #5000 12-wheel tender. Such a long loco with such a short tender is not without prototype. Southern Railway's Ls-1 and Ls-2 2-8-8-2's had short tenders because Southern did not want to build longer turntables and with the short distances that the Ls-class had to travel between fuel and water stops, long tenders were not needed. (We may just keep our Challenger this way to make it easier to build and use turntables and transfer tables).

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Less flash:
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Here are some photos of our HP 4-6-6-4 with our HP E-7 A/B diesel electrics.
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Almost the same length:
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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Fri Apr 13, 2012 11:45 am

The HP Challenger from above.
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Articulated turning to the left....
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and right.
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It is also worth noting that the articulation is close to the real thing, with one key difference: the real 4-6-6-4s rear set to driving wheels is fixed to the frame with no radial movement at all, with the front set of drive wheels pivoting at the rear, allowing the loco to take curves better than a rigid frame locomotive.

The HP Challenger has a bit of radial movement with the rear set of driving wheels. Not much for motion, but it is faintly noticeable when the loco is held in one's hands.

From Below:
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Starboard profile:
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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Fri Apr 20, 2012 9:21 pm

Here are some more photos of the HP Challenger:

This is the firebox backend, which is simply a piece of sheet metal that is formed to the back of the boiler with a pair of screw-holes, one that attaches to the frame, and the other that attaches to the boiler itself, which is the only fixed point for the boiler to frame. There is a c-shaped fitting that is between the driving wheel sets, that helps support the boiler on the frame, but is not a secure fit, which allows for some "slop" with the rear driving set.

When I restore and repaint this engine, I plan on trying to detail the backend plate, including space for adding an engine crew.
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For some comparison, here is our HP Challenger with Lindsey, our Lindsay 0-4-0, showing the largest production-line TT scale steamer along side of the smallest production-line TT scale steamer. (The PVM 4 wheeled diesel is much smaller, but ours are still in storage in Georgia.)

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Re: HP 4-6-6-4 Articulated

Postby Murad » Wed May 09, 2012 5:06 pm

Guys!
May I ask you to make some pictures of the frames of the articulated? Just frames - their sizes and shapes.
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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Thu May 10, 2012 1:28 am

Murad wrote:Guys!
May I ask you to make some pictures of the frames of the articulated? Just frames - their sizes and shapes.


Absolutely.

Right now my Challenger is siting with it's boiler off, in preparation for both the repainting of the boiler and cab, and the repair of the valve gear and drive assembly, so taking pictures is easy.

Are there any particular photos/profiles that you would like?
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Re: HP 4-6-6-4 Articulated

Postby Murad » Thu May 10, 2012 6:27 am

Could you make some pictures of the main frames without wheels?
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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Thu May 10, 2012 7:22 am

Murad wrote:Could you make some pictures of the main frames without wheels?


I would rather not, as reassembly is not as easy as it would seem.
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