VIIC/41 - Schematices drawing

[NZSnowman]

Hi Simon

How the research going on the piping? Now that I got my computer going again I am going to restart on my research on the piping.

Researches are momentary stalled - I'm afraid, that without any new materials or without visit in Laboe,
at this moment I can't figure out something new...

I hope, I will visit U-995 in May, and then many question will be answered.

--
Regards
Maciek

Hi Maciek

Thanks for the update I will finish the basic piping and then wait till you return from Laboe, before drawing the harder parts

Simon

[Pepper-mint]

Hi Simon,

I just wanted to be the "nine hundred and one post"  congrats Mate !!!

Cheers,
Laurent

[NZSnowman]

Hi Dougie

While doing your research on the vent patterns, did you come across any dimensions for the twelve circular vents above the torpedo doors? From the better set of plans I have, I got a diameter of 120 mm for the vents.

Simon

[dougie47]

Hi Simon,

I didn't do too much research into the holes for the article but did spend time on this for the U-Brass set, which included a drill template for these holes.

I think 120mm is a wee bit too large. I can't say for sure because we just working from photos, sometimes with not great resolution, and often taken at angles against the vents. The latter is a pain as it distorts calculations.

When we did the U-Brass set we reckoned that the circular hole was around 75mm. This was worked out by comparing the width of the hole against the space between each hole. This worked out with a few photos at around a factor of 0.4 (or 2.5 doing it the other way).

For example if the space between holes was 180mm then the hole itself would be 72mm.

Its hard to come up with a definitive figure for the holes but I reckon 75mm looks right against photos, whereas 120mm is too big.

Cheers,

Dougie

[NZSnowman]

Thanks Dougie for the information. I did not think about checking photographs. U-995 still has three original vents on the starboard side. I will see if I can calculate something from them and have a look at war photographs also

After looking at U-995, 120 mm does look a little big

Simon

[NZSnowman]

Hi Dougie

Using several very good photographs of U-995 I calculated a mean diameter of 69.852 mm with a SD of ±1.997 mm

So, I calculate the vents at: Diameter of 70 ±2 mm; With a drop of 25 mm per vent; With the first vent being 100 mm below the deck surface.

Simon

[dougie47]

Hi Simon,

Fantastic, if you get a figure so close by independent measurements then this is really good. I'll go with 70mm.

Cheers,

Dougie

[NZSnowman]

Atlantic Bow - Update

While adding the twelve circular vents above the torpedo doors to U-1308, I noticed that they did not fix the Type VIIC/41 very well. So I have another look at the bow shape. I feel that I made a mistake in my original drawing

http://models.rokket.biz/index.php?topic=106.msg5634;topicseen#msg5634

I believe now the alteration for the Atlantic Bow only affect the bow casting section, and does not affect the deck to № 91 like in my original drawing. If the alteration is only affecting the bow casting section, is makes sense as they would not need to modify any other part of the boat.


The pink outline is the Type VIIC and the green outline is the Atlantic Bow.


Above you can see the bow casting section. Is this the section they would had alternated for the Atlantic Bow (Source: Westwood).


Above you can see the outline of the Atlantic Bow (Source: http://www.subsim.com/radioroom/showthread.php?t=149950&page=21)

[Rokket]

You can really see it in that last pic, wow

[NZSnowman]

You can also see the outline on U-995 and a few other war time pictures of the Atlantic Bow.


(Source: http://www.uboataces.com/u995.shtml)

[NZSnowman]

U-1308 new bow section

[Rokket]

as always, looking great

[NZSnowman]

Free-Flooding Vent Patterns for U-1105, U-1106, U-1107, U-1304, U-1306 and U-1308 (or Type VIIC/41's with the Alberich coating).

Below are the likely Free-Flooding vent patterns for the U-boats above. The vent patterns are base on photographs of U-1105. In the images below, they display the standard Free-Flooding vent patterns for a Type VIIC/4 (in white) and the new layout for boats with the Alberich coating. They made the vents bigger, and had fewer of them. 

Free-Flooding Vent patterns for the stern


Free-Flooding Vent patterns for the central drainage area


Free-Flooding Vent patterns for the bow

[NZSnowman]

Boats with one, U-362, U-776, U-858, U-869, U-875, U-889, U-953, U-995, U-997, U-1023, U-1056, U-1165 & U-1305.

Also U-826, U-1058, U-1109

Also U-1202.

[NZSnowman]

Update for the Free-Flooding Vent patterns for the stern.

Made a few changes to the vents base on better photographs of U-1105.


Fig. 1. Top layer is the vent patterns for Type VIIC/41's with the Alberich coating/Lower layer is the vent patterns for Type VIIC/41's.