4.75″ LBSC Pansy- Adding Firebox Staybolts?

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4.75″ LBSC Pansy- Adding Firebox Staybolts?

This topic has 8 replies, 7 voices, and was last updated 22 November 2022 at 10:20 by Clive India.

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22 November 2022 at 05:12 #622145
Ian Brancifort
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@ianbrancifort36611
Hello everyone,

I have the opportunity to acquire a 4.75" gauge LBSC Pansy locomotive, and it looks quite nice, except it seems to have been built to the original 1958-1960 drawings. This means that there are no stays above the firehole door, which I believe has been brought up as a potential issue when getting the boiler certified.

I'm a complete beginner when it comes to large scale live steam, so I'm not aware of the order of operations when it comes to fabricating a boiler.

Is it possible to drill holes through the two rear sheets and silver solder stays in place? The locomotive isn't fully complete, and the backhead isn't fitted out yet. The boiler itself is fully complete however, having been hydro'ed some time ago.

If stays can be added, should I use threaded stays, or just silver solder some copper rivets in place?

Thanks in advance, I'd appreciate your advice.
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22 November 2022 at 05:12 #11370
Ian Brancifort
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@ianbrancifort36611
22 November 2022 at 08:02 #622149
RMA
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@rma
4.75 inch gauge? I'd check that out before you buy it. Club tracks are 3.5 ; 5 or 7.25 inch.
22 November 2022 at 08:52 #622154
Nicholas Farr
Participant
@nicholasfarr14254
Hi, LBSC's Pansy design is a 5" gauge, but he did give some guidance for building a 2-1/2" gauge one also. If someone has built a 4-3/4" one, it's an oddball one.

For information, the scan below shows dimensions of the 5" gauge wheels, axles etc.

Regards Nick.

Edited By Nicholas Farr on 22/11/2022 09:09:17
22 November 2022 at 09:08 #622157
davidk
Participant
@davidk
Where we in the UK, for example, have 5" gauge, the USA and Canada use 4 3/4" gauge instead, so quite normal over there. This is done as it's very close to scale gauge for 1" to the foot loco's.

Regards

David
22 November 2022 at 09:12 #622158
Nicholas Farr
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@nicholasfarr14254
Hi David, that's useful information.

Regards Nick.
22 November 2022 at 09:12 #622159
Redsetter
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@redsetter
OP – I think you will find that the gauge is 5 inches – measured over the flanges rather than between them – but do check. 4 3/4" gauge is used in the USA for example, so it is not impossible that somebody has adapted the design..

Before trying to modify the boiler, check that the absence of stays is actually an issue, and not just an old wife's tale. There must be many Pansies in circulation built to the original drawings and operating safely, even if they do not conform to current practice. Your club's boiler inspector would be able to advise you. It may be acceptable as it is.

Stays can be added using either of the methods you suggest, but it is perhaps not as easy as it may look if you have no experience of boiler making. So, make sure that you really do need them.
22 November 2022 at 09:13 #622160
Paul Lousick
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@paullousick59116
Depending on build quality and price, it should not be a big job to re-gauge it to 5" if it is actually a 4-3/4" . But check with your boiler inspector first to determine if the boiler or modifications are acceptable otherwise it could be very costly.

I am not familiar with the design of the boiler is a Pansy, but some boilers are fitted with girder stays instead of bars, which are not apparent from looking at the outside. Have you inspected inside to see its construction ?

Edited By Paul Lousick on 22/11/2022 09:37:09
22 November 2022 at 10:20 #622165
Clive India
Participant
@cliveindia
A boiler inspector will be interested in whether the boiler is to a recognised design, which the Pansy is. So – is it built to the drawings?
A bigger issue may be, if it is built to the original drawings, are there flanges for the ancilliaries – or do they screw directly into the copper. The original drawings do show it this way.
This is not the best technique and an inspector may not be fully supportive. There is no real reason, in my opinion, why this would be a show-stopper if the boiler passes a hydraulic test – but it is for some inspectors.
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