In the beginning
In the beginning
Hi all,
time to get started on the design concepts behind "Jaxcilliest Enterprises"
The initial design concept:
Some years ago there was a series of plans put together in the Quarrying and Mining and mining section of the Micro Layout Design Gallery on the late Carl Arendt's Small/Micro Layouts for Model Railroads website. The original concept by French modeller Bernard Junk was to haul stone from a quarry and tip it into a road vehicle at a lower level. UK modeller and MRH member "Shortliner" Jack Trollope modified the concept to tip from a loaded wagon at a higher level into another wagon at a lower level, and then to swap wagons. This took the now loaded wagon from the lower level to the tipping position on the higher level and moved the then empty wagon from the higher tipping position to the lower loading position. The loaded wagon can now be tipped and the process starts all over again.
Modifying the Design concept:
Shortliner's design was called "Jaxcilli Industries" . As Jack said in his description of his proposed HO 3' by 2' layout, the name says its all. Now suppose we get even "Cilli"-er and apply even more "Squeeze"?
The shortest way to make a height difference is with a vertical hoist. It cuts out the length of the uphill and downhill run between the tipping and loading points. But that means you need a way of getting your wagon to the hoist at each level...
Solution - go from the original 2 wagons with 1 locomotive operation to 1 wagon with 2 locomotives operation, each locomotive is captive to its own level.
Question - What scale do I build this in?
Answer - I do have some On30 stuff that I use on another layout - The 0-4-0 Porter steam loco, Davenport Gas-mechanical locomotive and V-tip wagon are already "available". All are shorter than a lot of HO locomotives and wagons. If we're really going to apply the maximum squeeze factor, then shorter is better, Even if we go up in scale from the original 1/87 to a larger 1/43.
Question - But how long a track do I need?
Answer: At least long enough for the wagon to be clear of the hoist cage when spotted at the tipping point or loading point, plus the length of the locomotive that is moving the wagon. Here part of the length is being provided by the Lifelike coal tipple bin,
Problem - But the bin is bigger than than the wagon???
Solution - Blank off part of the bin so that only the wagon length "plus a bit" to make sure that all tipped stuff makes it into the bin.
Problem - But the opening at the bottom of the bin is longer than the ON30 V-tip wagon selected because it was the shortest operating dump wagon I could find.
Solution - Blank off part of the opening so that all the load will land within about 3/4 of the hopper length. This helps to minimize spillage. The load will fan out slightly when it leaves the bin door, so making the loading aperture as big as the hopper will almost certainly guarantee some spillage occurs. Reducing the size of the loading aperture goes a long way to minimizing spillage, but the loading aperture must also be large enough to ensure that nothing hangs up and blocks the bin.
Question - How big a hoist do I need?
Answer - Large enough horizontally that The V-tip fits wholly within the hoist cage. Vertically, the hoist cage must be high enough to clear the top of the V-tip and probably also high enough to clear any locomotive that is shunting the V-tip wagon into or from the hoist. Overall the hoist has to be high enough so that when the cage is at the upper level there is still some headroom to allow for over-runs caused by operator incompetence when driving the hoist.
Just because a layout is small in size, doesn't mean that the design doesn't have to be thought through. There is arguably more design thought required when every fraction of an inch/mm counts,
The fog of design options is starting to clear. and something like this might just do the job.
Applying some rough dimensions gives:
Question - Why the "bump" walls
Answer - Well, we wouldn't want anything falling off the layout? Would we?? The extra 5mm of foamcore at each end adds little to the overall dimensions of the layout but adds much in terms of operational security in preventing high dives from the upper deck.
Every layout, even a small one deserves a back story, That'll be along next,