Posted 16 August 2011 - 11:57
This won't repeat everything that's gone before - see the blog for that - but will summarise mainly in photos where we are now and take it on from here.
So this is a model in 4mm scale of the whole Ouse Viaduct (or Ouse Valley Viaduct, or Balcombe Viaduct) on the Brighton main line north of Haywards Heath in Sussex - all 37 arches worth. The viaduct alone in that scale is about 20ft long. The master plan is eventually to connect the viaduct with models of Balcombe station to the north, Lewes to the south and possibly onwards to Eridge which is being built independently. This will all be in P4, and based in the 1950s/early 60s.
To give an idea, here is a diagram of the master plan, and a few select photos to give a random flavour of the real thing.
Posted 16 August 2011 - 12:20
Firstly, early trial mockups and the ordering of laser cut parts from York Model Making:
Early planning and construction:
How to join the sections (there are 5 in all):
Some details - arch course etching by Jim Smith-Wright:
Pavilion roofs and corbels, produced by Mark/Ark Royal in resin and 3D printing respectively (the latter still under development):
Master mockup for decorative brickwork at top of piers - this is being done in resin, also by Mark:
First showing of centre section as work in progress at RMWeb Taunton show last April:
Posted 16 August 2011 - 12:31
Posted 17 August 2011 - 07:56
As for highest standards of fidelity it's probably worth pointing out that there are no scale drawings of the viaduct that I am aware of (they will of course show up when we've finished) even though it was subject to significant renovation work in the 1990s. What we are building is therefore based on general data on length and height that can be found on the internet; measurements of the piers at ground level; and photographs from below, from adjacent public footpaths and through the window of trains passing over. Access to the top of the viaduct is a non-starter of course, even without the third rail issues. So everything on the model has been dimensioned from limited data cross referencing to known dimensions on low-parallax photos, counting bricks etc. There are many minor errors inevitably, which have required a few workarounds and compromises, but I hope we have got the general appearance and character about right.
We are quite close to having a trial assembly of the whole thing, and for Scaleforum we are looking forward to placing it in at least some preliminary rudimentary scenic setting.
Posted 04 September 2011 - 17:24
The resin cast corbels are only temporarily attached and are to be replaced with ones from Shapeways 3D printed ones in due course.
The top structures in grey primer prior to being finished with a beige colour to represent the Caen stone.
Posted 04 September 2011 - 19:49
At this (London) end the viaduct continues onto an embankment before rejoining the background topography; at the Brighton end the land rises more gradually from the valley floor to the higher ground to the south.
If you get to Scaleforum please drop by and say hello.
Posted 05 September 2011 - 19:36
05 September 2011
Posted by Re6/6
The first area to be 'terra-formed' has now been done.
Two of the main reasons for doing it this way is for lightness and durability. Using traditional plaster bandages, they're too easily damaged as I found out on Matford. The whole area is only supported along the edges with the chicken wire doing all work keeping all in place. It may need an second coating with resin as I've missed a few bits here and there. I'll see when it's all cured nice and hard, and of course it adds virtually no extra weight.
The materials that I've employed are used in the marine repair business and are freely available from any good chandlery.
The chopped strand fibreglass matting is impregnated with polymer resin & catalyst and forms a very hard and durable surface. The job ideally should be done in the open air as the smell is very persistent. At the moment the section is in the garage while it cures but with all the doors shut I can still smell it! Hopefully by tomorrow that should've disappeared.
Next to come will be brown earth paint prior to gluing down hanging basket line similar to the old hairy carpet underlay.
Then it will be selectively pulled off and treated with various scenic methods. I intend to experiment with the 'Grasmaster' used on top of the pulled off liner.
There still a lot more to do with the main structure before any scenics are done.
Posted 11 September 2011 - 16:54
Each refuge has 16 separate pieces, and there are 72 of them. They will of course look better after some light sanding, filling and painting.
Posted 17 September 2011 - 19:51
Cluttered work area with balustrades and bits of refuges
The London end with pavilions and other details temporarily attached with Copydex - they will be removed after Scaleforum for final fettling. Hopefully they will be painted in Caen Stone (aka Games Workshop 'Bleached Bone') before next weekend.
Remind you of anything?
All this just to cross a tiny stream!
Details added to two of the centre boards. and 3CEP added for scale - this is about 40% of the total length. Piers are missing decorative brickwork around the tops, some will be done before and even possibly during Scaleforum. We have some fabulous 3D-printed corbels to add as well.
Posted 27 September 2011 - 12:11
Some pictures on the Scaleforum topic at http://www.rmweb.co....post__p__496055
Now that's over, the whole lot (temporarily set up for the show) will be dismantled, fettled and then put back together permanently. There is a whole lot of detailing to finish, highlighted very clearly in the photos, but it will be nice to proceed with it now with a little less pressure - although we were glad of it to get us to where we are now.
Other fundamental issues that Scaleforum brought to the front of the queue for consideration included the layout support framing and undercarriage, which John will look into, the height and general presentation including need for and type of backscene, which I will, and the depth of scenery in front of it. For the last one, although it would be nice to see the final detail close up, the best impression will be from a bit further back, so we may add up to a metre to the front. All these issues are related, so I will probably make up a small card model of the model to test viewpoints and eyelines so we can get the right balance.
Posted 19 February 2012 - 21:08
John has been experimenting with trees, and I have been starting to correct the heights of the pavilions which we realised at Scaleforum were about 4mm too short in relation to the trains. These things happen when you have no drawings and decisions are being made on the fly. Anyway, no major drama, and Phase 1 of the 'great lift' is well under way with 2mm being added to the base of all the balustrades and refuges. The pavilions will also be raised by 2mm at the base in due course, and by another 2mm cut-and-shut into the roof slab on top of the columns.
I also took the opportunity to lightly sand the copings on top of the balustrades to get the slight arc of the real thing.
Posted 21 February 2012 - 15:01
Some of these will probably be removable for use on other projects. The smaller ones will be used on the Matford rebuild on the new extension board.
Posted 26 February 2012 - 15:42
I've now been working on lifting the roofs on the pavilions - the bases will also be raised to match the balustrades shortly.
Edited by 10800, 26 February 2012 - 15:43 .
Posted 03 March 2012 - 18:51
The moulding detail is designed to produce a passable representation of this
And this is how it looks on the model
And this is what the 'lift' was all about - to get the coach cantrail level lower in respect to the pavilion - now at the level of the top of the roof slab rather than nearer the bottom of the pitched section.
Posted 07 April 2012 - 14:52
Lengths of 7mm wide stripwood were temporarily glued with Copydex along the edge of the deck to allow the balustrades to be set at the right distance in from the edge; a simple jig was then used to set them in the right place with respect to the refuge outriggers. The refuges were then added after the alignment strip was removed.
The end balustrades and pavilions are just Copydexed for the time being because the pavilions may need to be removed for final painting.
The buttresses supporting the pavilions have also been extended outwards from their original too shallow construction.
Edited by 10800, 07 April 2012 - 14:53 .
Also tagged with one or more of these keywords: P4, viaduct, laser cutting, Southern, electric
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