10 inch Mortar Scale Model

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10 inch Mortar Scale Model

This topic has 29 replies, 13 voices, and was last updated 26 April 2018 at 20:48 by SillyOldDuffer.

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12 March 2018 at 17:03 #345727
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Having not seen nearly enough artillery models built I thought I would post a picture of my first model. Its a fairly simple scale model of a 10 inch Mortar from the Victorian era. If anyone is interested I can put up a few more pics as it progresses.

Is anyone else building this kind of thing?

Thanks.
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12 March 2018 at 17:03 #31212
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12 March 2018 at 18:07 #345731
Brian H
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@brianh50089
My very first engineering model was of a 12 pounder naval cannon as carried on Victory from the plans in Longridges' " The Anatomy of Nelsons Ships".

The inspection department where I worked had a Boxford lathe that I was allowed to use at lunchtimes, the company also made bespoke kitchens so there was some nice wood to make the carriage and the aerospace department heat treatment ovens provided a nice blued finish.

The cannon is still in my workshop.

Brian
12 March 2018 at 18:38 #345733
Mick B1
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@mickb1
Well, I made this 1:10 scale C18 24-pounder from plans by he late Jerry Howell of the USA.

I had a go at anglicising the more obvious American design aspects, Looking at Muller's 'Treatise Of Artillery' from 1791 I noticed a number of differences that I suspect are inaccurate simpifications, but it still looks OK on the windowsill.

I would like to make something more modern, but haven't yet found any suitable drawings.
12 March 2018 at 19:41 #345741
larry Phelan
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@larryphelan54019
I have a project in mind [in the back of my mind ] to make a cannon gun on wheels,to grace my front lawn,perhaps about 3/4 full size.,something about late 1700/early 1800.

Still thinking Any ideas ?
12 March 2018 at 21:55 #345761
Vic
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@vic
Nice work on the Mortar Richard.
13 March 2018 at 09:52 #345796
Clive B
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@cliveb55652
Richard,

That's a very nice model. I'd be very interested in more photos showing how the bed goes together and how you made/fitted the fillets next to the trunnions, these look very neat in the photos.

I am part way through a build of a 1;16 scale model of a 13 inch Victorian era land service mortar which will utilise a slightly later design of bed than yours. It's in brass as it's just a mantelpiece project (non-firing):-

Mick – I like your Jerry Howell cannon. I found the drawings to be pretty good, although I can't comment on their accuracy/authenticity. Here's my version at 1:20 scale:-

Clive
13 March 2018 at 12:31 #345813
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Clive

Many thanks, I like your models a lot too.
The bed was drawn on autocad and is made of 8 pieces of steel. I then sent the files to Malcolm at ME Laser who cut them for me. I then tig welded it all together. It was the only way I could think of other than screwing them together which seemed a lot more work. As I was painting this model black I was not too concerned about using welds.

The fillets were a real pain in the bum. As you know they have curves in awkward directions and seemed to me to be impossible to machine so I filed them. I first bored the hole for the trunnion into the fillet. I then pushed blutac onto the barrel and made a blutac filet. After carefully taking this off it gave me the shape I needed to file. It was very tricky but I did get a half decent fit in the end. They were then attached with an epoxy metal from b and q and a small amount was needed to fill some small gaps. I doubt this would be any good for you though as you are probably not intending to paint your brass model but I am going to paint mine.

If you do find a way let me know, I can only think of casting a complete barrel but thats not much help.

Regards

Rich
13 March 2018 at 21:23 #345937
Vic
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@vic
Some of you may find this of interest.
14 March 2018 at 08:12 #345999
Clive B
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@cliveb55652
Hi Rich,

Thanks for the additional photos. I'd like to see a photo or two when it's finished and painted. I intend to screw the parts of the bed together on mine. I am sure there must be a way to machine the fillets for the trunnions – I just haven't figured out how just yet!

Clive
14 March 2018 at 10:33 #346021
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Vic

How will he clean up the bit of barrel between the trunnions and get it as nice as the turned bits at either end?

Rch
15 March 2018 at 11:44 #346198
Vic
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@vic
Posted by Richard brown 1 on 14/03/2018 10:33:42:

Vic

How will he clean up the bit of barrel between the trunnions and get it as nice as the turned bits at either end?

Rch

Very good question, to which I don’t know the answer. I’ve contemplated building a civil war canon before and always wanted to construct the trunnions properly but this is one of the aspects that put me off the project!
19 April 2018 at 16:54 #350731
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An update on the mortar, its now finished so I have uploaded a few photos. I hope you like it!

Next will hopefully be a Victorian Rifled Muzzle Loader on a pivoting carriage.
19 April 2018 at 17:26 #350739
Mick B1
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@mickb1
Very nice piece of work, and well photographed. Congratulations.
19 April 2018 at 20:31 #350769
Neil Wyatt
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@neilwyatt
Thanks for sharing, it's a fine model.
19 April 2018 at 20:50 #350774
Jeff Dayman
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@jeffdayman43397
Well done Richard! it looks great.
22 April 2018 at 08:49 #351081
Clive B
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@cliveb55652
Excellent job Richard. Where was the picture of the original taken? Looking forward to some pics of your RML.

Clive
22 April 2018 at 10:26 #351088
Eugene
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@eugene
Very nice work.

Eug

Edited By Eugene on 22/04/2018 10:28:30
22 April 2018 at 11:03 #351095
richardandtracy
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@richardandtracy
Posted by Mick B1 on 12/03/2018 18:38:24:

Well, I made this 1:10 scale C18 24-pounder from plans by he late Jerry Howell of the USA.

I had a go at anglicising the more obvious American design aspects, Looking at Muller's 'Treatise Of Artillery' from 1791 I noticed a number of differences that I suspect are inaccurate simpifications, but it still looks OK on the windowsill.

I would like to make something more modern, but haven't yet found any suitable drawings.

Can I suggest you look on http://archive.org and do a search for the 6" MkXII Naval gun manual from 1917. They have a handbook for the gun and gizmos, with drawings at the end of the book of both the barrel and gubbins. Only the barrel is dimensioned, though.
22 April 2018 at 17:43 #351141
Mick B1
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@mickb1
Posted by richardandtracy on 22/04/2018 11:03:10:

Can I suggest you look on http://archive.org and do a search for the 6" MkXII Naval gun manual from 1917. They have a handbook for the gun and gizmos, with drawings at the end of the book of both the barrel and gubbins. Only the barrel is dimensioned, though.

Thanks for that. It looks a big project – investigating later…
26 April 2018 at 08:08 #351679
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Posted by Clive B on 22/04/2018 08:49:52:

Excellent job Richard. Where was the picture of the original taken? Looking forward to some pics of your RML.

Clive

Clive

I got the picture from a google search I think it is Fort Henry in Ontario. I have actually only seen these mortars twice. One was in the army museum in Lisbon and one in Guernsey. The drawings I made were from scaling various photos from google. There are so many different variations of the same piece that its difficult to make an exact scale model unless you visit one with a tape measure. That's why the grey block looks different as I would have copied that from a different picture.

Thanks

Rich
26 April 2018 at 09:09 #351686
Mick B1
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@mickb1
Considering the bore is only about 2 calibres long, I've often wondered what sort of MV you might get out of such a thing.

Presumably they used a finer grained powder than cannon grade, for a fast burn and a spiky pressure curve – but it's hard to see how they'd've made more than maybe 3- or 400 ft./sec. even so.
26 April 2018 at 09:35 #351691
Neil Wyatt
Moderator
@neilwyatt
Don't forget the point of them was throwing a heavy projectile up and over defences, so huge accuracy wasn't important and range didn't need to be far.

Even at just 100 metres per second, the range would be a kilometre d=v^2/g=100×100/9.8=~1000

I suspect that achieving a few hundred metres range inn practice would be ample for most purposes.
26 April 2018 at 09:48 #351694
David Standing 1
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@davidstanding1
Neil

I think the point Mick is making is about getting a clean/full powder burn for effective projectile throw.

It doesn't just go bang, it is quite slow burning, so by the time the projectile leaves the end of a very short barrel a full powder burn has probably not been achieved.

In extreme cases of poor powder burn, the projectile could just go 'plop' and fall out of the end of the barrel
26 April 2018 at 12:34 #351712
richardandtracy
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@richardandtracy
Interesting to see how they developed. The 1886 pattern 12" mortar is much more sophisticated in its carriage: **LINK**

Regards,

Richard.
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