Horwich Crab Boiler

This topic has 7 replies, 4 voices, and was last updated 7 January 2015 at 10:13 by John Baguley.

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17 December 2013 at 11:51 #138120
Derek Drover
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@derekdrover32802
Does anyone have a drawing with the dimensions of the boiler for Don Young's Horwich Crab design???

I'm working on a long design project of a 5" LMS Fowler 4P (2-6-4- tank), which has a parallel bellpair boiler.. the Crab one looks very similar and might be what I need…. if it can be designed in to fit..

Thanks

del.
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17 December 2013 at 11:51 #1243
Derek Drover
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@derekdrover32802
17 December 2013 at 14:14 #138130
John Baguley
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@johnbaguley78655
Hi Del,

Yes, I've got the Crab drawings. Which dimensions do you need?

John
17 December 2013 at 19:23 #138148
Ray Hulock
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@rayhulock43360
Hi Del,

I'm fairly certain that the Crab boiler is not the same as the Fowler 2-6-4T boiler. The Crab boiler was a one-off Horwich design where the 2-6-4T boiler was a standard Derby design – possibly G8S as used on compounds etc. Sorry I can't be more exact as I'm away from home and don't have access to my books. Ray.
17 December 2013 at 20:52 #138159
Derek Drover
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@derekdrover32802
Hi John.

Whats the barrel diameter & length.. then whats the length of the foundation ring section? I presume the foundation ring width is nothing special, and slips between frames as standard for 5" gauge?

Hi Ray, I know the boilers on the real engines were different, but model engines aren't so picky… so long as it looks similar outside proportions and is a published design (to please my boiler tester).

I sometimes wonder why I started this project in the first place….. basing the running chassis on the Enterprise, but stretching the frames out has proven such a difficult task… and understanding the drawing information (or lack off!!).

Cheers guys

Del
18 December 2013 at 01:06 #138172
John Baguley
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@johnbaguley78655
Hi Del,

The barrel is 5.625" diameter and 13.375" long. The firebox is 9.25" long at the bottom and 0.5625" shorter at the top ( the backplate slopes).The overall width of the firebox is 4" between the frames. Hope that helps.

John
7 January 2015 at 08:57 #175023
Keith Bloor
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@keithbloor37728
Good Morning, Could anyone out there that has built the Don Young 5" Crab help me with advice. Could you say what size Blast Pipe that you are running with, and what are the fittings for on the elbows at the bottom of the steam inlet Standpipes for. Don mentions Condensate Traps in his articles in LLAS. I thought they were for the lubricators at first but, I think I am right in saying, that these feeds go straight into the piston valves.

Regards Keith Bloor

Edited By JasonB on 07/01/2015 09:42:10
7 January 2015 at 10:13 #175035
John Baguley
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@johnbaguley78655
Hi Keith,

Haven't built one so can't help with the blast nozzle size but the elbows are indeed connections for a condensate drain valve. They are piped to a valve mounted behind the rear cylinder drain cock and operated by the same linkage.Details are shown on sheet 8 of the drawings (bottom right).

John
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