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Author Topic: GWR 4-4-2 North Star and subsequent 4-6-0 Star Class design and build  (Read 357 times)

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Online Snowwolflair

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Following on from my Nelson Bear and U1 models I have decided to turn my attention back to the GWR.

The predecessor of the Castles and Kings were the Star Class which in itself themselves were developed from the North Star the Churchward interpretation of similar French "Atlantic" class locomotives.

Approaching the models from the CAD point of view the Star Class were 85% of the design of the North Star, the main differences being the front of the running plate and below.  The Farish Castle chassis also looks to be suitable and in 1:1 scale they were basically identical.









Offline Railwaygun

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the elliptical wheels will make it a great runner!
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Offline Doc Pye

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An interesting project! If you do go ahead please don't put it up on Shapeways, as they have priced themselves out of the game, at least for me, especially when you tag on their overpriced shipping.

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I list on Shapeways for "strangers" or where there are parts that I cannot print, like brass or when the shape is too complicated for my resin printer.

The models do sell well and the process is completely hassle free.

For friends and my club members I print the parts I can on my own printer at cost.  @Hailsone has already reserved a Star  :D
« Last Edit: June 26, 2020, 09:31:03 AM by Snowwolflair »

Offline longbow

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Are you making the 4-6-0, the 4-4-2 version, or both?

As I'm sure you know, the backstory is that North Star was initially built as a 4-4-2 to allow evaluation against the De Glehn compound Atlantics. Churchward decided that 4-cylinder simple engines were the way to go, and the rest is history. And only a few years earlier the GWR's were still building outside framed 4-4-0s for express duties.

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Are you making the 4-6-0, the 4-4-2 version, or both?

As I'm sure you know, the backstory is that North Star was initially built as a 4-4-2 to allow evaluation against the De Glehn compound Atlantics. Churchward decided that 4-cylinder simple engines were the way to go, and the rest is history. And only a few years earlier the GWR's were still building outside framed 4-4-0s for express duties.

I am going to do the CAD for both in one file.  The parts that are different I can create as two component sets and switch them on and off in the CAD.  I also plan to build both as final models.

Offline Doc Pye

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Quote
@Hailsone has already reserved a Saint 

I must have missed that....more info please :)

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First steps for the CAD

The basic shape of the boiler and firebox.



The modified shape of the Farish Castle chassis is in blue



And this is what needs cut off the Farish Castle chassis to fit and not require the firebox shape to be compromised.  I will need to dismantle the chassis and mill this metal off.




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Once I took the chassis apart I was able to judge the final cut which has involved the removal of the top parts of the casting that secure the motor.  This actually gives me some needed extra space with the downside that the motor will be glued in place.




The test print fits perfectly which means that I can proceed with the rest of the design without having to compromise the shape of the firebox.



The chassis will now get a thorough clean and a coat of paint.

NB the firebox is deeper than it will end up as the running plates for the Star class and the North Star were at different heights, and this will be trimmed when they are drafted.

 

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