4mm Wagon Chassis for GWR Siphon O1 (diagram 3d body)

[Tom F]

I was wondering if anyone can suggest a suitable chassis for the diagram 3D Siphon O1 body?

https://www.diagram3d.com/index.php?route=product/product&product_id=144

 

Many Thanks

 

Tom

Edited November 12, 2019 by Tom F

[Siberian Snooper]

Probably one of the Ratio 4 wheel coach chassis will be the closest, I'm not in a position to check too see which one at this time.

 

 

[brossard]

If you knoiw what the underframe looks like, you could scratch build one from plastic strip.  I did it a couple of times.

 

Eg: 

 

John

 

[Tom F]

I don't I'm afraid, and would feel more comfortable building a kit chassis if there is one suitable...but if need be, scratch building will be the route.

Wonder if @Miss Prism might know?

Edited November 12, 2019 by Tom F

[brossard]

Someone might have a reproduction works drawing.  I've been given one or two of these for other wagons by members and they are incredibly useful.

 

John

[Miss Prism]

Haven't got my HMRS Siphons book at the moment, so am relying on memory. Chassis would be double footboards, a la other siphons, clasp brakes (from a vacuum cylinder, there would probably be a manual brake, but not sure what kind it would be) and, worst of all, the brakes would have outside clasps.

 

It will look something like this:

https://www.scalefour.org/forum/viewtopic.php?f=132&t=4923&sid=5dded190dd65ae5b243dd1ad6283daac&start=25

and

http://www.raymondwalley.com/carriages/gwr/w1.html

 

[Tom F]

7 minutes ago, Miss Prism said:

Haven't got my HMRS Siphons book at the moment, so am relying on memory. Chassis would be double footboards, a la other siphons, clasp brakes (from a vacuum cylinder, there would probably be a manual brake, but not sure what kind it would be) and, worst of all, the brakes would have outside clasps.

 

It will look something like this:

https://www.scalefour.org/forum/viewtopic.php?f=132&t=4923&sid=5dded190dd65ae5b243dd1ad6283daac&start=25

and

http://www.raymondwalley.com/carriages/gwr/w1.html

 

 

Many thanks Russ. Would it be worth trying to source one of those kits for the under frame?

[Miss Prism]

I don't know if the lengths are the same.

 

[Tom F]

Well, some browsing has suggested for the W1 Brake, the cut and shut of a Ratio under frame works. I'm unsure though if this would be correct as you say Russ, for the O1 Siphon.
https://www.dartcastings.co.uk/shire/SR613.php

 

For those wondering the interest in an O1, this is what I'm intending to depict (obviously sold off by the GWR  ).

[Guy Rixon]

I've found the class in Slinn and Clarke (Rixon found a book in 10 minutes of searching! Ring the church bells!) .

 

The following is from Bernard Clarke's drawing, plus the two, murky photos in the book. The 4-wheeled O1 vans are 18' over headstocks on a 12' wheelbase. Vacuum brakes, with Dean-pattern cylinder and centre-crank on the centreline of the van. Clasp brakes with rigging outside the wheels. No sign of any handbrake, which seems to be normal on the early siphons. Can't see what the axleboxes look like, but the springs seem to be 48" between mounts and are mounted in shackles, not J-hangers. Buffers are the 2'-long coach kind.  Footboards are double for the full length of the van, and the upper footboard aligns with the bottom of the solebar.  Wheels are drawn as Mansell pattern.  Mr. Clarke's drawing doesn't show much solebar detail.

 

Now  the text for the type adds both detail and complication.

 

"The load of these vans was originally 4 or 5 tons with 6ft springs, but some with altered springing, possibly to the 4ft 6in type, were upgraded to 7 tons. Lot 180, still with 4ft 6" springs, was built to carry 5 tons. All these were built with clasp type brakes with the rigging outside the axleboxes. Automatic vacuum brakes were added in the 1880s."

 

"As built, these siphons have footboards below the doors only, but between 1886 and 1888, in common with other passenger stock, lower footboards were added at axlebox height to run the length of the body and hte footboards at solebar level were also extended to the same length"