VIIC/41 - Schematices drawing

[NZSnowman]

Tore, the green spot is the location for the hull opening for the Schnorchel position indicator.



Was looking at something other this morning and noted the plan of the 'Bold' it got many of the mechanical system needed for the Schnorchel position indicator, it must give us a idea 
http://www.u-historia.com/uhistoria/tecnico/visitaguiada/lanzasenyuelos/lanzasenyuelos.htm

[NZSnowman]

Update on the LM 43U mount.

Now also known from U-249 and U-1028.

Here are all the different version of the 3.7cm Flak M42U found on Type VIIC's

3.7cm Flak M42U

The 3.7cm Flak M42U was the marine version of the 3.7cm Flak used by the Kriegsmarine on Type VII and Type IX U-boats. The improvement was base on the earlier 3.7cm Flak SK C/30 developed by Rheinmetall. The 3.7cm Flak M42U used several types of mounts and entered service in autumn 1943.

LM 42U Mount
The LM 42U mount was developed specifically for the 3.7cm Flak M42U. It was man by a 3 man crew, with a fourth man, the loader.

LM 43U Mount
The LM 43U mount was the final deign of mount used on U-boats. It further improvement on the LM 42U. The LM 43U was only known to be installed on three U-boats (U-1171, U-1305 and U-1306).

DLM 42U Mount
The twin mount was base on the  design, in which the 3.7cm Flak M42U guns were mounted side by side.


Fig. 1. A Single 3.7cm Flak M42U gun on the LM 42U mount.


Fig. 2. A Single 3.7cm Flak M42U gun on the LM 43U mount.


Fig. 3. A Twin 3.7cm Flak M42U guns on the DLM 42U mount.

[Capt Kremin]

Hi NZSnowman
 
I took these last month on the U 534 of her M43U DLM42U, hope they help, if you would like the full sized images, pm me with an email addy.
 
1 of 3
 
Regards
 
Jon

[Capt Kremin]

Hi All
 
Can't count, 9 photos in all
 
2 of 5
 
Regards
 
Jon

[Capt Kremin]

Hi All
 
Can't count, 9 photos in all
 
3 of 5
 
Regards
 
Jon

[Capt Kremin]

Hi All
 
Can't count, 9 photos in all
 
4 of 5
 
Regards
 
Jon

[Capt Kremin]

Hi All
 
Last picture,
 
and finally
 
NZSnowman
Dougie suggested I show you this last pic, hope you're sitting down, this is how not to restore the deck of a type IXC40 courtesy of Mersey Travel
 
Regards
 
Jon

[NZSnowman]

Hi All
 
Last picture,
 
and finally
 
NZSnowman
Dougie suggested I show you this last pic, hope you're sitting down, this is how not to restore the deck of a type IXC40 courtesy of Mersey Travel
 
Regards
 
Jon

Thanks, they are great 

I can see lots of new details I can add to my drawings 

Thank again!

[Capt Kremin]

Hi NZSnowman
 
No problems
 
In case you are wondering about the odd angles, the pictures were taken from a camera attached to a carbon fibre telescopic flagpole. 
 
Regards
 
Jon

[NZSnowman]

Base on Jon photo's I noted my drawing of the DLM 42U mount did not match the photo’s. So I recheck my photo's and the drawings in German Naval Guns 1939-1945 by Miroslaw Skwiot.
 
The drawing on page 341 is incorrect! The two drawing of the side views are of a LM 42U mount not the DLM 42U mount!

New drawing is base on photo’s of the DLM 42U mount.

[NZSnowman]

Simon
I fully realise there are limits to details however I could not resist adding a few more details to the schnorchel system as you see on the drawing below. The locking pin eyes are obvious. The hydraulic stuffingbox drain is important to prevent oilslick. The inboard drain valve is shown on the photo and the drain ends into the big drainbox on the  forward bulkhead port side of the controlroom. The mast position indicator I have mentioned before. I assume the connection from the hullrod to the mast could be teleflex as fitted on the mechanical indicators for the hydroplanes. The hull transmission is done by a steelrod moving up and down. The cable is indicated on the drawing as heatingcable, I cannot remember that but guess it could be for the radar detectionsystem as well.
Tore

Spend all afternoon looking for the heating cable and radar detection cable hull openings, could not found them in any photo’s of U-995 
 
Will have it add it to the list of things to check on U-995 when I get there one day.

Simon.
I cannot find the cable hull openings either, but for sure the U 995 had a radar detection antenna on top of the schnorchel and some wires had to go into the pressurehull possibly near the sonar/ radioroom.
Tore

Thanks to Falo photo's I think I have location the heating cable and radar detection cable hull openings in U-995

Base on DSC_0127.JPG photo, http://models.rokket.biz/index.php?topic=1150.msg15066#msg15066 you can see a Pressure Hull opening in the top right of the photo. I initial thought the black colour on the pipe was a colour code, but from Falo high-res photo (below) you can see it unpainted electrical braided cable

Tore, what do you think, also what do you think about other opening in the top left of the photo?

[tore]

Simon.
I agree this is probably the  radarwarning cable going towards the sonar radio rooms. As to the red painted pressurehull opening it looks like a cable opening as well. Could that be the removed heatingcable?.
Tore

[NZSnowman]

Simon.
I agree this is probably the  radarwarning cable going towards the sonar radio rooms. As to the red painted pressurehull opening it looks like a cable opening as well. Could that be the removed heatingcable?.
Tore

I was thinking the same thing, the other opening was the heating cable, but I was also wondering would the German's run both the heating and radar detection cables together through  the same opening?

[tore]

Simon.
I don`t think you can put the two cables through the same pressure hull stuffingbox.
Tore

[NZSnowman]

Tore, I have estimated the two pressure hull openings. The heating cable is aft of the Schnorchel hinge, and the radar detection cable forward of Schnorchel hinge next to the Schnorchel Hydraulic Stuffingbox Drain.