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Author Topic: 3D Prestwin Powder Silo Wagons  (Read 1547 times)

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Offline maridunian

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3D Prestwin Powder Silo Wagons
« on: June 22, 2020, 01:56:46 PM »
As BR developed its new vacuum-braked goods fleet in the 1960s, it included two pressure loaded/discharged powder tankers, the familiar PRESFLO cement and the less well known PRESTWIN twin silo wagons.

Airfix offered OO models of both in the 1960s and Dapol still supply these. Hornby Dublo offered a different variant of the PRESTWIN, the original Diagram 274, on a 10' chassis, whereas Airfix/Dapol's is based on the later Diagram 277 with a 12' wheelbase. They were replaced by PCA tanks from the 1980s, but are an interesting and important design for their time.

I decided I'd like to add some of these to my tanker collection, so started collecting information and pictures.

Here's my progress to date.



Catwalk, ladders and valves to add, which doesn't sound much, but check out these pictures .

I've begun a Shapeways product for this, which I'll update as the design develops.

Comments welcome, as always!

Mike


« Last Edit: June 25, 2020, 02:41:42 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline Roy L S

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Re: 3D Prestwin Powder Silo Wagons
« Reply #1 on: June 22, 2020, 02:11:01 PM »
Yes please! I have wanted some for years so will keenly watch these develop...

What chassis do you plan to use Mike, or will you print one?

Roy

Offline crepello

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Re: 3D Prestwin Powder Silo Wagons
« Reply #2 on: June 22, 2020, 02:34:20 PM »
Looking good but don't you mean vacuum-braked?

Offline maridunian

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Re: 3D Prestwin Powder Silo Wagons
« Reply #3 on: June 22, 2020, 02:46:21 PM »
What chassis do you plan to use Mike, or will you print one?

Hi Roy - both bodies have been designed to fit the Peco NR121 10ft wheelbase chassis, but a Peco Parkside 12ft wheelbase chassis is more appropriate for the lower set Diag. 277.

Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline maridunian

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Re: 3D Prestwin Powder Silo Wagons
« Reply #4 on: June 22, 2020, 02:50:22 PM »
Looking good but don't you mean vacuum-braked?

Yes, now amended. Thanks

Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline maridunian

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Re: 3D Prestwin Powder Silo Wagons
« Reply #5 on: June 22, 2020, 09:20:03 PM »
First pass at catwalk and access ladders....



A first test print may not be far off after all .....

Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline Newportnobby

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Re: 3D Prestwin Powder Silo Wagons
« Reply #6 on: June 22, 2020, 09:34:04 PM »

Catwalk, ladders and valves to add, which doesn't sound much, but check out these pictures .

Jeepers, Mike :goggleeyes:
All that top detail is a bit boggling!

Offline Bob G

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Re: 3D Prestwin Powder Silo Wagons
« Reply #7 on: June 22, 2020, 10:14:11 PM »
Talking of pronunciation, I was 57 before I realised these were Pres-Twin wagons.
I had always called them Prest-Win. Therefore I never got the difference between PresFlo and PresTwin.
And I had built the Airfix kit about 50 years ago!

Good luck with the designs.
Bob

Offline maridunian

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Re: 3D Prestwin Powder Silo Wagons
« Reply #8 on: June 23, 2020, 12:33:48 PM »
Ok, well that's the most obvious detailing done. Time to measure everything up again and generally sanity-check against photographs before ordering a test print.



Mike


My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline icairns

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Re: 3D Prestwin Powder Silo Wagons
« Reply #9 on: June 23, 2020, 04:48:17 PM »
The Prestwin  wagon is an interesting prototype.

According to British Railway Wagons by Don Rowland, 31 examples were built to diagram 274 (10' wheelbase) and 100 wagons were built to diagram 277 (12' wheelbase).

For diagram 277, instead of the Parkwood 12' w/b chassis, can I recommend designing this model for the Dapol 12 w/b chassis?  I find it any chassis that requires assembly difficult to get square and provide an absolute true runner.  The Dapol chassis is ready-to-run (but does not have NEM couplers). 

Assuming that the 3D print does not have the silo bottom connections that project through the underframe (difficult to see in the Prestwin 3D illustrations), I would recommend the Dapol chassis for their 20T mineral wagon (spare part # 2A-000-019).  All that need s to be done is to cut off the tie bars.  A small downward projection may be required to maintain the coupler and spring in the correct position.

Typically, the Dapol chassis costs about £1.00 less that the Parkwood chassis.

I think both the Parkwood and Dapol chassis will require a floor for the model if not incorporated into the 3D print.

Also, Fox do Prestwin transfers (Fox # FRH2965) and each sheet has enough decals for 5 wagons.

Ian

Offline maridunian

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Re: 3D Prestwin Powder Silo Wagons
« Reply #10 on: June 23, 2020, 05:14:46 PM »
For diagram 277, instead of the Parkwood 12' w/b chassis, can I recommend designing this model for the Dapol 12 w/b chassis?  I find it any chassis that requires assembly difficult to get square and provide an absolute true runner.  The Dapol chassis is ready-to-run (but does not have NEM couplers). 

Thanks very much Ian. I have a Dapol Ex-GWR 21T mineral wagon somewhere, so I'll check.

If you have a look at the model on Shapeways using a PC or laptop, the (3D) button let's you swivel the design around to see it from all angles. I've not represented any detail below the top of the sole bars.

Mike
« Last Edit: June 23, 2020, 05:16:24 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline maridunian

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Re: 3D Prestwin Powder Silo Wagons
« Reply #11 on: June 23, 2020, 09:24:23 PM »
For diagram 277, instead of the Parkwood 12' w/b chassis, can I recommend designing this model for the Dapol 12 w/b chassis?  I find it any chassis that requires assembly difficult to get square and provide an absolute true runner.  The Dapol chassis is ready-to-run (but does not have NEM couplers). 

Thanks very much Ian. I have a Dapol Ex-GWR 21T mineral wagon somewhere, so I'll check.

Hi again Ian - here are the two 12' WB chasses together, Dapol closest.



Clearly either would do for the Diag. 277s, so I'll mention both on Shapeways.

Thanks again

Mike
« Last Edit: June 23, 2020, 10:36:45 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline maridunian

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Re: 3D Prestwin Powder Silo Wagons
« Reply #12 on: June 25, 2020, 02:28:29 PM »
That's about it for now - I know it's time to stop adding small details when I start having to backtrack through the design to fix something more important I should have noticed sooner. Specifically, that the original Diagram 274 wagon didn't have an operator platform below a cutout in the top catwalk...  :-[



1st draft print now ordered from Shapeways .

Watch this space!

Mike
« Last Edit: June 25, 2020, 04:22:15 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline icairns

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Re: 3D Prestwin Powder Silo Wagons
« Reply #13 on: June 30, 2020, 09:32:14 PM »
I have always been fascinated with Prestwins.  About 20 years ago, I bought a few of the Lima continental twin silo wagons with the intention of kit bashing them into freelance “Prestwins”. 

Having not done anything with these wagons since acquiring them, during the recent lockdown I decided that I really must get on with it.  I am not the first person to do this I know, as I have seen several examples of this “conversion” on other people’s layouts. 

So, I made up a fleet of five Prestwins.  I removed the wire pieces from the tops of the wagons and made the top and middle operator platforms from plasticard.  The original ladders were removed and modified before replacing back on the body.  The models were painted and then finished with Fox transfers.  The wagons run on a Dapol 20T mineral wagon chassis (12’ wheelbase) with a plasticard floor added. 





During this period, I also bought a Prestwin kit from the 2mm Scale Association.  This kit has a resin body and etched chassis.  I made up the body and used some of the detailing parts from the etch on the body but abandoned the etched chassis as being too complicated for me.




The 2mm scale body is actually a model of Diagram 277 (12’ wheelbase) but, because it is under-scale for N gauge, it fits perfectly on a Peco 10‘ wheelbase chassis.

So now I have five overscale freelance Prestwins and one under-scale Prestwin (but I am happy). 

Little and Large




Just when I was getting over my Prestwin phase, I saw maridunian’s 3D print that will provide a much more scale model than either of my efforts. 

I can’t wait!

Ian



Offline maridunian

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Re: 3D Prestwin Powder Silo Wagons
« Reply #14 on: July 01, 2020, 08:03:26 AM »
Hi Iain - sorry I haven't released these yet - I got distracted with some other stuff that I'd like to add to my Shapeways order. I'm not mean, but their shipping cost roughly equals the price of a model, so bulking up makes sense!

Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

 

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