Pascal Casanova is a friend, passionated by the First World War, living in Verdun area. He is a very talented battlefield photograph, but also an expert in Computer Assisted Design. He lets us take advantage of his skill by designing detailed 3D rebuildings pictures of WW1 fuses and shells.
Some words from him, explaining his method to me :
The basic data (parts and functionning) are mainly coming from texts and 2D schematics of the German Artillery Manual of 1918.
I take note of the external dimensions of my fuses collection, as well as some other infos coming from the internet, mainly from your website.
The 2D schematics show the thread diameter. I use that measure to determine an approximative value of the drawing scale. This scale is then used to recompute the dimensions of all the other parts.
I would like to say that I am sometimes forced to imagine the shape of some parts, because I do not have access to all the needed drawings. Any additional information would be welcomed to give some potential improvement to my works.
All the redesigned parts are then assembled one per one to rebuild the fuse. Once the assembly is done, I define a surface aspect that matches the fuse material, to give it a look as close as possible to the reality.
When the fuse is made with all its parts, it is possible to create transparent views, cut views, or even to realize some animated sequences.
The following pictures collection is an extract of his creations.
Family picture of the HZ14 series fuses, with, from the left to the right, the HZ14 fb, the HZ14 vorst, and the HZ14 vorst fliehb. For more details on these marks, have a look on the HZ14 fuses webpage.
And now let the magic happen : this HZ14 vorst fuse becomes transparent, and let us see the activation mechanism specific to the German percussion fuses !
Family picture of the KZ14 fuses series, showing two of the marks of that puse made in different materials (steel aluminum, brass), as well as a cut view showing the security system with compacted gunpowder grain. More details in the KZ14 fuses page.
The Gr Z 04 fuse is another item that can be seen quite often on the former battlefields. On the right, it is assembled with a mighty 210 mm explosive shell. See more details on the Gr Z 04 page.
The transparent view shows the two percussion mechanisms, with and without delay.
The EK Z 17 fuse is more rarely encountered on the former battlefields nowadays. Moreover, the surviving items are often heavily damaged and corroded, and the percussion rod is often missing. More details on the EKZ 17 fuses page.
The arming and percussion sequence of the fuse (from the left to the right) :
Fuse at rest, the percussion rod is blocked by the centrifugal rod pressed by a spring
Fuse during the flight, the shell spin pushes the centrifugal lock away, freeing the percussion rod movements
Fuse during the flight, zoom on the safety spring at the bottom of the percussion rod
Fuse hitting its objective, the percussion rod compresses the safety spring, and the percussion pins ignites the starter.
The Dopp Z 92 fuse is relatively often found nowadays on the former battlefields, most of the time still assembled with the ton part of a schrapnell shell. But it never shines like this one ! More details on the Dopp Z 92 fuse page.
German bottom fuse Bd Z 10 (Lg Bd Z 10 and Kz Bd Z 10)
The bottom fuse Bd Z 10, preferred German fuse for the 150, 210 and 280 mm calibers, existed in two main marks, screwed either on a short detonator, with 25 grammes of picric acid, or on a long one, with 100 grammes of picric acid. It was then respectively named Kz Bd Z 10 or Lg Bd Z 10. For more details please go to the Bd Z 10 fuse page.
This time the fuse transparent view, here in its long LgBdZ10 mark, shows a very complex internal mechanism !.
The bottom fuse Bd Z f Spgr m.K. equipped the shells of the famous long range 380 mm heavy guns, as well as the 280, 240, and some 210 mm shells. There was a mark with a short delay, named Bd Z f Spgr m.V.u.K..
The arming and percussion sequence of the fuse (from the left to the right) :
Fuse at rest, the centrifugal locks are blocked by the locking rod
Fuse at the shot departure, the locking rod is pushed ahead by the pressure of the combustion gases on a rear membrane
Fuse during the flight, the centifugal locks are pushed away
Fuse hitting its objective, the percussion pin hits the starter.