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Krupp 420mm Big Bertha by Haliburton - Takom - 1/35


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 Love the Lord Fauntleroy pants on the guy in group photo seated on far right. Seems a little too old to be wearing that style pant. 🤔 umm trousers? 

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Posted (edited)

@Jack12477, the young gentlemen seated to the right is wearing 'knickerbockers' or 'plus-fours' - this was the hip outdoor sports attire from the late 19th century to around the 1930s. They were used when cycling (no chain-guards, so that the trousers don't get caught), golfing (to prevent trousers getting dirty), hunting (same reason), etc. While not acceptable at formal occassion (unlike today), they were worn to show that you were a sporty person (very much like today people are wearing those horrible track-suits and the likes, even when they are not pursuing any sports).

 

As to the colour and appearance of the projectiles: they would have been special 'hard-cast' steel, so when bare, a metallic grey. There would be also two or three guidance rings that are pressed into the rifling, probably copper or perhaps brass. The detonator (which in this case may be in the bottom of the shell) would be brass. I don't know what the WW1 practice at that time in Germany was, but normally shells would be colour-coded according to the type. I would assume that they were painted 'field-grey' or something like that to prevent rusting, perhaps with coloured bands or lettering to indicate the type. You would need to verify this against the literature.

Edited by wefalck

wefalck

 

panta rhei - Everything is in flux

 

 

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 @wefalck thanks for explanation. Interestingly there is a landmark hotel in Times Square called The Knickerbocker built by Jacob Astor in 1901. BTW I agree with you about the inappropriate "active-wear" track/gym suits worn today, especially the ones that are so tight you can read the date on the nickel in their hip pocket. 

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I suppose each generation has its ‘trendy’ clothes that become cringeworthy when one looks back - and then those subtle changes the fashion industry creates to pressure people to go out and “update” their wardrobes (e.g. thin ties, wide ties and back to thin ties.  
 

Wefalck that you for the input on the shells, it is appreciated.

Currently building:

HM Yacht Chatham - 1:64 - Caldercraft

 

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Artillery Shells weren't cast anything, they were usually made of a steel alloy from sawed off round bars... This process started as soon as they started using rifled barrels....

 

Here is a British Pathe' film of ladies making artillery shells in the process used in 1914-18....

 

 

Pressure rings or "Sabots" were usually hard bronze and machined as part of the shell once they were swaged onto the projectile...

 

No casting of anything, bar stock straight from the mill to the saw shop... Everything from 20mm all the way up to 480 mm... They would have a shiny smooth machined surface usually +/- .0005 in surface irregularity...

 

There are plenty of photo shots of shiny shells lining the trenches waiting to be fired...

 

Or, period pics like this on of a Big Bertha with a Shell ready to ram...

Big-Bertha.jpg.468a81f3fb5cadd6db4cddc4b8f324ce.jpg

You see how shiny the shell was? Yes they would stencil explosive information as to type of shell it was on the sides, but they wouldn't be painted like they were in WWII of even today... The French army started the war with 5 million shells of all calibers in the arsenal, they went through them in three months... The German Army had 12.6 million artillery rounds to start the war... NO ONE had any conception of how fast the modern weapons could be fired so their prewar stocks were established under rules dictated by 1870's rules of artillery use...

 

They were making shells as fast as they could, and in 1915 there was an actual artillery round shortage (on both sides) where a battery of guns might have 20 rounds between them...

 

They didn't have time to paint artillery rounds...

Current Build: F-86F-30 Sabre by Egilman - Kinetic - 1/32nd scale

In the Garage: East Bound & Down, Building a Smokey & the Bandit Kenworth Rig in 1/25th scale

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Temporary Suspension: USS Gwin DD-433  F-104C Starfighter "Blue Jay Four" 1/32nd Scale

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Posted (edited)

And this video shows the German process of forging large artillery round blanks before machining....

 

 

I believe it's from the Krupp works long about 1918....

Edited by Egilman

Current Build: F-86F-30 Sabre by Egilman - Kinetic - 1/32nd scale

In the Garage: East Bound & Down, Building a Smokey & the Bandit Kenworth Rig in 1/25th scale

Completed: M8A1 HST  1930 Packard Boattail Speedster  M1A1 75mm Pack Howitzer  F-4J Phantom II Bell H-13's P-51B/C

Temporary Suspension: USS Gwin DD-433  F-104C Starfighter "Blue Jay Four" 1/32nd Scale

Terminated Build: F-104C Starfighter

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I didn't actually say that the shells as such were cast. I was referring to a special steel-alloy developped from the 1870s or so on by Krupp, which in German was called 'Hartguß'. Say in the 1880s, the shells, to my knowledge, actually were cast into cockilles, where the quick cooling surface hardened them.

Howitzers like the one we are talking about were designed to destroy bunkers and other hardened facilities, so the shells need to be hard and tough. Too soft and they will use much of their kinetic energy for deformation and the energy will be distributed over a too wide cross-section - too hard and they will fragment on impact, again dispersing the energy. At that time, turning hardened steel was difficult to machine, so they wouldn't turn and bore shells from solid bar-stock.

Rather, a process of drawing and drop-forging was used to give most of the shape. Drawing and forging also arranges the structure within the steel, to make it tougher. The square billets from which the process started in the film were presumably cast. Not sure, whether continuous casting and hot cutting would have been available at that time.

At 16'10" in the film one can see that even late in the war (I gather the film is 1917/18ish) the shells were painted and were given painted/stencilled marks as to their type. Otherwise they may rust quickly, even if greased for the transport to the front. Firing a rusty shell would not be good for the gun and may difficult to load.

 

Interestingly, our peace-time stocks and production capacities are just not capable of keeping up with war-time demands, as the war in Ukraine shows again.

 

These large artillery barrels had only a limited life-time, after a certain number of shots they would be worn out. Peace-time shell supply presumably was calculated on this basis.

 

 

wefalck

 

panta rhei - Everything is in flux

 

 

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Ok, does anyone know the difference between a Mortar, Howitzer and Gun?

 

Big Bertha was a Mortar, (Morser in German) the British and American 9.45" (240mm) Gun was a Mortar....

 

The difference is in the angle of fire they produced, Mortars are relatively short ranged weapons to deliver plunging fire, when originally designed Big Bertha only had a range of 9k metres... extremely short for an artillery grade weapon.  But, it fired a projectile that could penetrate 1.5 meteres of reinforced concrete, 4.5 meteres of cast concrete and created craters that measured 6 meteres deep and 30 meteres wide...

 

As you see in the video, large shells were pressed into basic shape while white hot then hammer forged and allowed to aircool this had the effect of aligning the grain of the steel and eliminating any stresses created by forced cooling, toughening the steel but leaving it malleable... (as the press forming of the casing showed in the video establishes)

 

There are two ways to quick cool newly formed steel, water and oil, both create a hard outer surface and a tough grain aligned interior material it's generic term is called case-hardening.... High carbon steel is heated to an orange color, (do enough of it and you quickly learn to judge temps by the color of the metal) then plunging it into various liquids to cool it rapidly, what happens is the surface of the metal crystalizes and when cooled it creates a hard outer casing and a tough inner material... for steels that have less than 3% carbon content, the steel needs to be carbonized first before the process of case hardening it can be done... But the idea is to create a very hard outer surface with a tough inner core... That is not what is being shown in the videos....

 

'Hartguß' or Hartguss, is the German name for Chilled cast iron, part of the ductile iron class of materials specifically... Yes it can be formed in press machinery like in the second video, but it is difficult to machine given it's formulary makeup, it can be ground though and is used to make camshafts and other such long wearing products... It acts in industrial uses like Case Hardened Steel... It is easier to produce than steel but harder to work into useable parts...

 

I imagine they can make shells from it and looking at the old deteriorated examples in the museums I would say they did.. (they look like rusted corroded cast iron)..

 

If you want, I can dig out my Machinists handbook for the section on hardening the various types of metals for more accurate info.... 

 

Not saying your wrong, just saying that from specific knowledge I know that artillery rounds were not made from case hardened materials, it made them too hard....

Current Build: F-86F-30 Sabre by Egilman - Kinetic - 1/32nd scale

In the Garage: East Bound & Down, Building a Smokey & the Bandit Kenworth Rig in 1/25th scale

Completed: M8A1 HST  1930 Packard Boattail Speedster  M1A1 75mm Pack Howitzer  F-4J Phantom II Bell H-13's P-51B/C

Temporary Suspension: USS Gwin DD-433  F-104C Starfighter "Blue Jay Four" 1/32nd Scale

Terminated Build: F-104C Starfighter

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Well, it seems that Gruson in Magdeburg specialised in 'Hartguß' for armour and armour-penetrating projectiles: https://de.wikipedia.org/wiki/Grusonwerk.

 

I would need to bring myself up to speed as to the metallurgy of the various types of 'Hartguß' developed for armour and amunition by Krupp, Gruson and others. Both the metallurgy and the processing determine the their properties for different applications. My area of interest in general is before 1890, so I am not so familiar with the later materials.

 

To my knowledge HSS-tools were the only ones available to turn/mill steel during WW1. Carbide (WiDia) tools were only invented in 1926. So pre-forming shells by drawing and drop-forging saved a lot of difficult machining and, as noted before, aligns the grain in the material favourably.

 

I gather the classification of artillery into guns, howitzers and mortars became a bit fluffy in the course of WW1, as certain howitzers were given a maximum elevation more like that of mortars. They became effectively longer-range mortars. Or, one could say that mortars were made longer in order to give the projectiles a greater V0. 

wefalck

 

panta rhei - Everything is in flux

 

 

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It’s slightly more than just the angle of elevation that classifies whether a piece is a gun/howitzer/mortar. It also has to do with the trajectory of the shell, and the ratio of propellant to shell weight.

To lob a mortar shell into a high looping trajectory takes far less propellant proportionally to the weight of shell than an anti-aircraft gun, even though both are designed to fire at high angles of elevation. However, you could technically turn an anti-aircraft gun into a mortar by reducing the amount of propellant from the cartridge.

 

Jumping to WW2 British artillery practice, the QF 25 pounder field artillery, as well as the BL 4.5” and BL 5.5” medium artillery were considered to be gun-howitzers. Because their shells were loaded separately from their propellant charge, the charge weight could be altered on the spot, by the gun crews, as required. With this flexibility of trajectory, the pieces could be fired at low or medium angles. Both field and medium crews were trained in indirect fire as well as anti-tank shooting (the latter being done over open sights, direct fire, flat trajectory), although they seldom practiced the latter in actual combat.

 

Andy

Quando Omni Flunkus, Moritati


Current Build:

USF Confederacy

 

 

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Yes, long about 1908 the differences between the three types began to blur....WWI brought it to a concordance... Afterwards, mortars were trending downwards in size, (becoming an infantry weapon) howitzers stabilized at around 150 or 155 mm, (but the largest were still 240mm class) and were the heart and soul of the artillery branches and guns became anything firing in a flat trajectory in direct fire, however with a lot of overlap in application... 

 

By the end of WWII massive howitzers and guns had no real distinction on the battlefield, they both could do the same jobs... This is clearly seen in the usage of the 155mm & 8" guns and howitzers of the US army the 280 mm Atomic Annie was classed as a gun rather than what it actually functioned as...

 

With Big Bertha, in1914 they reduced the weight of the explosive charge from just over 900 kilos to less than 800 kilos and gained some 5,000 metres in range out of the exact same barrels...

Ballistics is always a relative game, you identify what you need your weapon to do and design it to accomplish it... Once that's all done, someone who knows less than the designer slaps it with a type name and it is forever typecast into that....

 

Metallurgy is a science, and a very extensive science at that... And yes Chilled Iron for a long time was considered the best armor one could buy and was one of the hardest metals produced, but by 1936 most high velocity guns could easily penetrate it and armor production moved into homogenous plate and cast high carbon steels at much lighter weights.... Chilled iron armor also had the very bad habit of fracturing into hundreds of small pieces, when it failed it became it's own shrapnel...

 

One of the drawbacks of Chilled Iron for artillery shells is sometimes it was just too tough... They would hit and go off but the casing wouldn't fracture, they would blow the fuse out of the tip when they went off... this is why there are thousands of big artillery rounds that have been recovered from the WWI battlefields... Essentially buried intact but with no fusing or explosive charge.... 

 

Yeah the Carbide cutter, and in 1936 the diamond tipped cutter.... (Hughes Tool Company) But then again it wasn't just metal cutting tech that improved, steelmaking did as well, pretty much leaving cast iron methods behind

Current Build: F-86F-30 Sabre by Egilman - Kinetic - 1/32nd scale

In the Garage: East Bound & Down, Building a Smokey & the Bandit Kenworth Rig in 1/25th scale

Completed: M8A1 HST  1930 Packard Boattail Speedster  M1A1 75mm Pack Howitzer  F-4J Phantom II Bell H-13's P-51B/C

Temporary Suspension: USS Gwin DD-433  F-104C Starfighter "Blue Jay Four" 1/32nd Scale

Terminated Build: F-104C Starfighter

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  • 2 weeks later...

Hi folks, while I have not yet reworked the colour of the shell and there will be a tad more weathering to follow I’m  going to call this one a wrap. Photos are below and I’ve including a shot with my other WW1 builds beside Bertha to provide a sense of scale. All are 1/35.   Alongside Bertha in the last shot are the Krupp 21 cm Morser, mark iv and whippet tanks.   Thanks so much for looking in!  Scott

 

 

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Currently building:

HM Yacht Chatham - 1:64 - Caldercraft

 

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Yep, Bertha was four tractor loads for the gun alone, not counting the equipment to emplace and assemble it...

Current Build: F-86F-30 Sabre by Egilman - Kinetic - 1/32nd scale

In the Garage: East Bound & Down, Building a Smokey & the Bandit Kenworth Rig in 1/25th scale

Completed: M8A1 HST  1930 Packard Boattail Speedster  M1A1 75mm Pack Howitzer  F-4J Phantom II Bell H-13's P-51B/C

Temporary Suspension: USS Gwin DD-433  F-104C Starfighter "Blue Jay Four" 1/32nd Scale

Terminated Build: F-104C Starfighter

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Quote:

"Relish Today, Ketchup Tomorrow"

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Loving these   - really nice work.

 

OC.

Current builds  


28mm  Battle of Waterloo   attack on La Haye Saint   Diorama.

1/700  HMS Hood   Flyhawk   with  PE, Resin  and Wood Decking.

 

 

 

Completed works.

 

Dragon 1/700 HMS Edinburgh type 42 batch 3 Destroyer plastic.

HMS Warspite Academy 1/350 plastic kit and wem parts.

HMS Trafalgar Airfix 1/350 submarine  plastic.

Black Pearl  1/72  Revell   with  pirate crew.

Revell  1/48  Mosquito  B IV

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Very impressive 

Regards, Patrick

 

Finished :  Soleil Royal Heller 1/100   Wasa Billing Boats   Bounty Revell 1/110 plastic (semi scratch)   Pelican / Golden Hind  1/45 scratch

Current build :  Mary Rose 1/50 scratch

Gallery Revell Bounty  Pelican/Golden hind 1/45 scratch

To do Prins Willem Corel, Le Tonnant Corel, Yacht d'Oro Corel, Thermopylae Sergal 

 

Shore leave,  non ship models build logs :  

ADGZ M35 funkwagen 1/72    Einhets Pkw. Kfz.2 and 4 1/72   Autoblinda AB40 1/72   122mm A-19 & 152mm ML-20 & 12.8cm Pak.44 {K8 1/2} 1/72   10.5cm Howitzer 16 on Mark. VI(e)  Centurion Mk.1 conversion   M29 Weasel 1/72     SAM6 1/72    T26 Finland  T26 TN 1/72  Autoprotetto S37 1/72     Opel Blitz buses 1/72  Boxer and MAN trucks 1/72   Hetzer38(t) Starr 1/72    

 

Si vis pacem, para bellum

 
 
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Posted (edited)

Haliburton,

 

That's a very impressive conclusion to the build. Very well done.

 

It got me wondering if the gunners used 'ear defenders'? But, from what I read online, it seems they weren't allowed to since they would not be able to hear orders.

 

Richard

 

PS: I worked besides a retired tank Commander for a while....and he had hearing aids.

Edited by Rik Thistle
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6 hours ago, Rik Thistle said:

That's a very impressive conclusion to the build. Very well done.

Thank you Rik!

 

thanks also Patrick, CDW and O.C, Egilman, RGL and all others for your valuable inputs and likes. I find the historical discussion just as engaging as the build!    Scott

 

 

Currently building:

HM Yacht Chatham - 1:64 - Caldercraft

 

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13 hours ago, Rik Thistle said:

Haliburton,

 

That's a very impressive conclusion to the build. Very well done.

 

It got me wondering if the gunners used 'ear defenders'? But, from what I read online, it seems they weren't allowed to since they would not be able to hear orders.

 

Richard

 

PS: I worked besides a retired tank Commander for a while....and he had hearing aids.

I'd be surprised if after a few days firing they could hear anything.  Not just tanks but any "noise makers".... jets, sidearms, MG's, etc.   Many if not most of us who were in the military and especially combat zones end up with hearing aids.

Mark
"The shipwright is slow, but the wood is patient." - me

Current Build:                                                                                             
Past Builds:
 La Belle Poule 1765 - French Frigate from ANCRE plans - ON HOLD           Triton Cross-Section   

 NRG Hallf Hull Planking Kit                                                                            HMS Sphinx 1775 - Vanguard Models - 1:64               

 

Non-Ship Model:                                                                                         On hold, maybe forever:           

CH-53 Sikorsky - 1:48 - Revell - Completed                                                   Licorne - 1755 from Hahn Plans (Scratch) Version 2.0 (Abandoned)         

         

                                                                                                                                                                                                                                                                                                

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20 minutes ago, mtaylor said:

I'd be surprised if after a few days firing they could hear anything.  Not just tanks but any "noise makers".... jets, sidearms, MG's, etc.   Many if not most of us who were in the military and especially combat zones end up with hearing aids.

What? 

Greg

 

 

 

 

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Hmm.. scratch the word "jets"....  my mind wandered a bit and for some reason typed that in.  <sigh>

Mark
"The shipwright is slow, but the wood is patient." - me

Current Build:                                                                                             
Past Builds:
 La Belle Poule 1765 - French Frigate from ANCRE plans - ON HOLD           Triton Cross-Section   

 NRG Hallf Hull Planking Kit                                                                            HMS Sphinx 1775 - Vanguard Models - 1:64               

 

Non-Ship Model:                                                                                         On hold, maybe forever:           

CH-53 Sikorsky - 1:48 - Revell - Completed                                                   Licorne - 1755 from Hahn Plans (Scratch) Version 2.0 (Abandoned)         

         

                                                                                                                                                                                                                                                                                                

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yep,
after 42 years of working in the metal and chemical industries. And 8 months of military service in Germany with the Belgian army.
I have a constant buzzing and ringing in my ears.

 

If you made a comment about a noisy environment you got this answer:
You get used tothaat, after a while you don't hear it anymore...

🙉

Regards, Patrick

 

Finished :  Soleil Royal Heller 1/100   Wasa Billing Boats   Bounty Revell 1/110 plastic (semi scratch)   Pelican / Golden Hind  1/45 scratch

Current build :  Mary Rose 1/50 scratch

Gallery Revell Bounty  Pelican/Golden hind 1/45 scratch

To do Prins Willem Corel, Le Tonnant Corel, Yacht d'Oro Corel, Thermopylae Sergal 

 

Shore leave,  non ship models build logs :  

ADGZ M35 funkwagen 1/72    Einhets Pkw. Kfz.2 and 4 1/72   Autoblinda AB40 1/72   122mm A-19 & 152mm ML-20 & 12.8cm Pak.44 {K8 1/2} 1/72   10.5cm Howitzer 16 on Mark. VI(e)  Centurion Mk.1 conversion   M29 Weasel 1/72     SAM6 1/72    T26 Finland  T26 TN 1/72  Autoprotetto S37 1/72     Opel Blitz buses 1/72  Boxer and MAN trucks 1/72   Hetzer38(t) Starr 1/72    

 

Si vis pacem, para bellum

 
 
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What did you say?  I can confirm hearing loss and that buzzing in one's ears, called tinnitus, due to 28 years of jet noise. Hearing aids are a daily thing now. Luckily they are rechargeable, versus putting those tiny batteries. All courtesy of my Uncle Sam.

Ken

Started: MS Bounty Longboat,

On Hold:  Heinkel USS Choctaw paper

Down the road: Shipyard HMC Alert 1/96 paper, Mamoli Constitution Cross, MS USN Picket Boat #1

Scratchbuild: Echo Cross Section

 

Member Nautical Research Guild

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