Wanted machinist projectile drawing for 42cm M-Gert L/12 Dicke Bertha (Big Bertha)

[HAZORD]

I haven't seen many WWI era machinist's drawings of any projectiles, but I'm wondering if anyone has any drawings for the projectile/projectiles used in the 42cm M-Gert L/12 Dicke Bertha (Big Bertha)?
I have a cartridge case, and I'm entertaining the idea of laminating some wood together and turning a wooden replica projectile to go with my case. I would also like to paint it with the correct color code, so any info regarding the colors of the large German AP-HE WWI projos would also be a bonus.

 

[Vasco Da Gama]

The best I can offer is the technical drawings on pages 214 and 216 of the republished Notes On German Shells 1918, ISBN 1-847348-48-3 published by the Naval and Military Press in the UK. Page 214 provides. 1/20 drawing of the early shell, 1540mm long and page 216 details the updated version 1513mm long again at 1/20 scale. Probably insufficient detail for your task but at least a start!

 

[HAZORD]

Vasco Da Gama,

Thanks for the info. I don't have that book. Is there any chance you could scan those 2 pages or take a photo of it and PM me?

Thanks,

John

 

[kahu1]

Some pics from what i'm guessing is the original source document for the 'Notes on German shells'.
This book is marked 'Proof' and has a few unfilled entries,and some pencil notes on some pages!.


cheers
Bob

 

[Vasco Da Gama]

Thanks Bob
Saved me a job, same information and technical drawings as in the 1918 version.

 

[2pounder]

Its makeable from that info especialy if you make the 2CRH as a template assuming you are going to hand turn it from wood or have you got a friendly cnc machinist?

 

[HAZORD]

I have a lathe that I was planning to use after laminating enough wood together to turn down. I was hoping the drawings would have the radius of ogive on them and the outer rotating band diameter. But they are still very good!

 

[kahu1]

There was a thread on the IAA forums recently with a very interesting method of laminating and turning large projectiles,might be worth a search.
Some of the drawings do have radius and like info, but mainly the 70-150mm types.

 

[HAZORD]

kahu1,

I haven't been on the IAA forum. Would you have a hyperlink to an approximate location of the posting? Do they have it divided into projectiles, cases, etc.? It sounds like exactly what I would like to learn about.

 

[kahu1]

http://iaaforum.org/forum3/viewtopic.php?f=8&t=14973

Try this ,its the one i was talking about.
I only look at the forum ,its open so worth a try.

 

[HAZORD]

kahu1,

That is a pretty cool thread. It provides a method of making the projo hollow and uses a lot less wood.

That guy is very talented. Hell, I ought to see if he wants to make the Bertha Bullet? I don't care what he says though, I would still paint it. I wonder if his lathe with turn 42cm? The one he shows in his photos isn't large enough.