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Delph - Caprotti Black 5 finished

Dave Holt

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My Caprotti Black 5, 44741, of Longsight depot, is now finished. The last job was to add plain boiler bands to the firebox and some extra weathering to bring it more to the condition these locos seemed to exhibit in regular service, i.e. filthy. This work was done, as was the whole painting, lining and weathering, by good friend and fellow P4 modeller, David Clarke. I have to say, I'm extremely pleased with the finished loco, which I think really captures the rather ungainly appearance of these locos. a study into how to transform the rather elegant normal Black 5 into an ugly duckling!
Here are three photos of the finished model.
First a couple of shots taken on my short length of test rack in the modelling room:

 

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And here a photo by David Clarke during a recent visit, showing the loco standing near the signal box on "Holt":

 

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Dave.

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David, it was a pleasure doing the loco. It was good that I had 2 goes at the weathering as I was able to introduce some different tones to the finish. The loco itself is fabulous I just wish I could build to anywhere near that standard. Next job is your Fowler 2-6-2 tank.

 

David

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Where does the rotary drive come from on this version of the Caprotti valve gear? On the later Ivatt class 5's and the BR standards there is a drive shaft from the centre axle outside the coupling rods that goes to the cylinders, but I cannot see anything similar on these. 

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Most of the black 5s with Caprotti valve gear had it arranged internally (between the frames) and driven via a bevel gearbox.

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On 14/04/2019 at 14:18, Traintresta said:

Where does the rotary drive come from on this version of the Caprotti valve gear? On the later Ivatt class 5's and the BR standards there is a drive shaft from the centre axle outside the coupling rods that goes to the cylinders, but I cannot see anything similar on these. 

Yes, as Regularity says, on the earlier Ivatt locos, the drive was taken from a gear-box fitted to the leading coupled axle, on the loco centre line, to a cross shaft under the smoke-box saddle, which drove the cam shafts in the Caprotti valve gear boxes on top of the cylinders.

I have included the main drive shaft and the top portion of the bevel gear-box in the model, but it's not very visible in the finished model.

Dave.

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Thanks for the replies. I suppose that makes modelling it easier. I went looking for valve gear yesterday but I can only find the comet crab chassis with reidinger gear.

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1 hour ago, Traintresta said:

Thanks for the replies. I suppose that makes modelling it easier. I went looking for valve gear yesterday but I can only find the comet crab chassis with reidinger gear.

The Ivatt Black 5 model is by Comet, but was a full loco kit, rather than just a chassis or valve gear kit.

As a matter of interest, I also have a BR Standard  Caprotti Class 5, with the outside drive shafts you mentioned earlier. The centre axle drive gear box and slide bars are from the DJH kit but all the shafts, universal joints, reversing gear boxes, brackets, etc., are home made from brass sheet, wire and tube.

 

IMG_1799.JPG.5dd98b104254d626c5ba57daa600d87b.JPG

 

Dave.

Edited by Dave Holt
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9 hours ago, Dave Holt said:

The Ivatt Black 5 model is by Comet, but was a full loco kit, rather than just a chassis or valve gear kit.

As a matter of interest, I also have a BR Standard  Caprotti Class 5, with the outside drive shafts you mentioned earlier. The centre axle drive gear box and slide bars are from the DJH kit but all the shafts, universal joints, reversing gear boxes, brackets, etc., are home made from brass sheet, wire and tube.

 

IMG_1799.JPG.5dd98b104254d626c5ba57daa600d87b.JPG

 

Dave.

 

That's starting to look like the way to go since I can't afford either a whole comet loco kit or a DJH kit. any pointers on how to do this?

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Where and when can we see this beaut perform? Totally convincing Dave.

 

Mike

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Mike,

Thanks for your kind comments. Unfortunately, there are no current plans for the model to appear in public in the foreseeable future. I do run my locos from time to time on club test racks and other peoples layouts, but those are generally private events by invitation only. My own layout is far from complete (if it ever is) and being in a condition to exhibit.

 

Traintresta,

Not quite sure what to say on this. I wouldn't say that the outside Caprotti gear is easy to create the way I did it. I had made dimensioned sketches from the real loco at Butterley, years ago, before it was restored and also took some information from the GA drawings of the last two Ivatt Black 5 Caprotti locos that appeared to share some common components. The representations of the universal joints was also rather fiddly, to say the least.

The Comet Reidinger gear might be a basis for modification to suit one of the outside Caprotti types. I've seen a Crab model with this type of gear that looked very nice indeed.

 

Dave.

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