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Coming together


RedgateModels

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not much progress this weekend, spent too long in the kitchen ripping off tiles and wall units ready for the plasterer on Wednesday :angry:

 

Finished off the front bogie and did a little more fetting with the boiler lower. Here's a couple of shots of the loco assembled so far

 

blogentry-6717-127710825374.jpg

 

blogentry-6717-127710826185.jpg

 

the second one shows an area of concern for me. I will have to fabricate the missing section of firebox bottom and grate so that it at least meets the frames (that shouldn't really be there). Ashpan might get some extensions too.

 

You can just see the edge of the gearbox drive extender between the bolier lower and the frames in this shot. A spot of black paint and it will go :D

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I agree, it's vital to fill in the gap between the firebox & ashpan and the frames for appearance.

 

I also agree with your concern about the side view. There appears to be an excessive gap between the front of the lower firebox and the flange of the rear drivers. On a full size wide firebox loco (see Btitannias, Clans, modified Bulleids, etc.), this would only be a matter of inches whereas the model has close on half a wheel diameter. I suspect that if these loco's had actually been built, the boiler barrel would have been made shorter than on a Britannia (or perhaps the Hornby boiler is longer than scale?). I suppose you can hide this by either shortening the boiler - a big job (probably involving shortening the chassis), or extending the lower firebox sides forward to reduce the gap, or, alternatively, just live with it! How do the boiler and loco overall length compare with the published weight diagrams?

 

Dave.

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The rear driver to firebox/ashpan gap is much greater than that of a Britannia on the original Cox drawing although it's not as great as that achieved with the Hornby body here :unsure: I think that the Hornby firebox/ashpan does not lip forward as much as shown in the cox drawing. I'll have another look tonight though, it will mean messing with the front of the frames, but I might be able to throw the whole chassis backwards a bit :lol:

 

Hornby body seems to match up OK to the Cox drawing, certainly on length etc.

 

Having said that, once it's all painted black and there's a few pipes etc in that area it won't be so noticable.

 

EDIT: just had a quick play with overlaying the cox drawing on the photo and it clearly shows that there is some serious distortion on the pic that makes the gap seem larger than it really is as well. It was taken on my 80 quid cameraphone :lol: I have all my preliminary sketches for the frames including the trace of the Hornby chassis. My concern at the moment is that there was a last minute change to the design at the front of the chassis which may have thrown the whole lot forward :blink: If so, it's not the end of the world, it can all be sorted.

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Looking at the weight diagrams in the Cox book, the proposed boiler for the 2-8-2 was identical to that on the Britannia so, barring any significant errors in the Hornby body, then the front of the firebox should be in the right place.

 

Looking at the diagrams, the position of the cab and rear of the firebox relative to the rear pony-truck axle is the same on both designs. On the Brit, working forward from the truck axle, there was 10' minus half a wheel (3' - 1") to the rear edge of the rear driver = 6' - 11".

On the 2-8-2, we have 9' - 6" - 2' - 7.5" = 6' - 10.5". So there is only half an inch difference in the gap between the rear drivers and the front of the firebox on the two designs.

 

You mention that the front end of the frames was altered, so perhaps this is the area where the discrepancy has arisen?

 

Again, looking at the diagrams, the 2-8-2 is 6" (2 mm) shorter than the Brit from the front buffer beam to the rear truck axle. As shown above, the rear end is almost identical, so all the difference is taken up somewhere near the front of the loco.

 

For modelling purposes, it might be best to split the difference and have an extra millimetre at both ends?

 

Hope you resolve this to your satisfaction as it's a great project.

 

I recall that somewhere earlier in the blog you wrote something that suggested that to some extent you were designing the model as you went along (position of frame spacers, perhaps?). I don't think i could do that - all my models are planned out on paper to the n'th degree, with doubtful aspects drawn out to scale, before I make anything! This approach does add quite a bit of time to a project, but generally avoids problems later on.

 

Regards,

 

Dave.

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Beat me to it, I've checked tonight and the last minute changes to the front of the frames caused it. I've shifted the whole lot 2mm back and it looks much better. Good news is that the cylinders are in the right place now, did'nt get round to checking that before.

 

I've added some plasticard packing at the front to make up the gap!

 

I'll add an entry tomorrow with photos. Good spot there, it would have been very messy later on to fix this :D

 

The Hornby Brit smokebox is too long (but not by much) for the 2-8-2 which might have thrown me also ....

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