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Author Topic: Stern structure outside pressure hull  (Read 3513 times)

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Offline bianco64squalo

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Stern structure outside pressure hull
« on: 02 Jan , 2018, 04:19 »
Hi eveybody,
I’m sorry to keep on asking help, but without assistance of experts of this forum, I can’t start the construction of stern structure of my Trumpeter U-552 in 1/48 scale; I have the basic drawings of David Westwood’s book ( Anatomy of the ship ), but it’s impossible for me ( altough I’m an architect, used to read drawings ), to put togheter plans and sections to have an 3D reconstruction of the stern structure.
In particular I can’t understand the exact borders of aft buoyancy tank and main ballast tank 1, besides the position of various stringers and beams....
One more time I make my request, hoping for any help....
Thanks in advance.
Filippo
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #1 on: 02 Jan , 2018, 12:28 »
I have not research the stern yet, I am still working on the saddle tanks. but have you tried:

http://www.ubootwaffe.pl/okrety/wyposazenie/zbiorniki-okretowe
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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #2 on: 02 Jan , 2018, 14:59 »
Thanks NZSnowman, but there is not useful materials on that site, I already knew it....
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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #3 on: 15 Jan , 2018, 07:19 »
Hi everybody,
wainting the Planmappe: Uboottyp VII C [/size]that I ordered today, is there anyone who can highlight in the posted drawing the exact position of the various stringres on elevation plan ?[/color]
[/size]Thanks in advance.[/color]
[/size]Filippo[/color]

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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #4 on: 16 Jan , 2018, 06:14 »
Hi everybody,
this is the last time I ask help to the forum's members about this question; if I'll obtain some new informartions, I'll try to do by myself.
For convenience, I post some drawings, extracted from David Westwood book, on which I indicated a part of my questions...
Any help is welcome.
Thanks in advance.
Filippo
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #5 on: 16 Jan , 2018, 10:45 »
Re stringer height, quetion e. if you look on the Type VIIC/42 above. they look like they are marked on this plan.

I have to go to work now, but I take a look at the other quections tonight after work. 
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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #6 on: 16 Jan , 2018, 13:56 »
Hi NZSnowman, I did not understand your answer: it’s criptic....
I’ll wait for more informations, when you’ll have more time...
Thanks anyway...
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #7 on: 17 Jan , 2018, 00:55 »
Hope this helps. Like I said before, I have research the stern so I do not know all the anwsers.

Page 1
a. The top of the keel.
c. I believe it one solid rod.
d. Three sections, two outside of pressure hull and one inside pressure.
e. two beam, one each side of the stern casting.
 
Page 2
B. No
C. No, the floor is flat. C is the aft training tank.
D. I have not seen any drawings.
 
Page 3.
A. I believe the support are into the tank.
C. This is the edge of the MB Tank 1.
E. Do you have any pictures of U-995 stern? You can see the stringers very easily.
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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #8 on: 17 Jan , 2018, 02:19 »
Thanks Snowman,
I hope in other answers ( pag. 4 and 5 ) and other ideas, if available...
About your first replies:


PAG. 1:
a) the top of the keel is only a sign that shows the border of the keel, or it was a structure, like a plate; in this case, in consideration that the Ballast Tank. 1 was open to sea in its lower surface, was this plate perforated? And finally, the keel was part of MB Tank 1 ?
d) three sections? Which structure are you talking about ? The stern torpedosuppor arm is very far from pressre hull...
e) Were those two beams symmetrical ? Is there a drawing ( plan ) that indicates their position ?


PAG. 2:
b) ok, they are not what I tough, but were what ?


PAG. 3:
e) finally a good idea that I never though about: see the stringers from outside...I have many photo of Laboe U-995: I'll try to identify the stringers from hull plates deformations....


 
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #9 on: 17 Jan , 2018, 10:34 »
Quote from: bianco64squalo on 17 Jan , 2018, 02:19
PAG. 3:
e) finally a good idea that I never though about: see the stringers from outside...I have many photo of Laboe U-995: I'll try to identify the stringers from hull plates deformations....

You can see the lines of rivets on the casting
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #10 on: 17 Jan , 2018, 10:41 »
Quote from: bianco64squalo on 17 Jan , 2018, 02:19
PAG. 1:
a) the top of the keel is only a sign that shows the border of the keel, or it was a structure, like a plate; in this case, in consideration that the Ballast Tank. 1 was open to sea in its lower surface, was this plate perforated? And finally, the keel was part of MB Tank 1 ?

It’s the top of the aft keel casting, which is just below Stringer 1
« Last Edit: 17 Jan , 2018, 10:46 by NZSnowman »
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #11 on: 17 Jan , 2018, 10:45 »
Quote from: bianco64squalo on 17 Jan , 2018, 02:19
d) three sections? Which structure are you talking about ? The stern torpedosuppor arm is very far from pressre hull...

The torpedo tude has three sections. It were no torpedo suppor arm, there a large size pipe that ran above and to one side that is the control arm to the torpedos door.
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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #12 on: 18 Jan , 2018, 06:43 »
Hello,
I found this U-96 Hachette 1/48 from a German modeler.
I post some photos.
In your opinion the position asymmetrical of the two beams ( Stringer III ) is correct?
And what about the aft stern casing? Is it correct?
Thanks in advance for opinions...
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Offline David83

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Re: Stern structure outside pressure hull
« Reply #13 on: 20 Jan , 2018, 12:38 »
Dear Filippo

you have the book of David Westwood you posted this picture before, you can see clearly that the both stringers are offset .

br David
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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #14 on: 21 Jan , 2018, 03:46 »
Hi David,
I completely agree with you; I only was perplexed because of Snowman’s answer at my B question of figure n. 2; he stated that those two lines on drawing were not the stringers....
I have the greatest respect for his authority, but in this case I’m very doubtful....
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #15 on: 21 Jan , 2018, 10:43 »

The two yellow lines 'B' are the side wall of the tank. The stringers are marked in pink.



You can see the two stringer on the casting. The yellow box highlight the orange line in Q1 page 1

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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #16 on: 22 Jan , 2018, 02:24 »
Thanks Snowman,
but there is a thing that I don't understand: if you look at the posted drawing, it seems that MBT 1 ( colored in green ) was large the whole hull, and not only between the two yellow lines of previous post: is this drawing wrong ?
And furthermore, is in your opinion the aft buoyancy tank ( colored in pink in the posted drawing ) correct in shape ?
Thanks in advance for replies....
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Offline David83

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Re: Stern structure outside pressure hull
« Reply #17 on: 22 Jan , 2018, 10:07 »
Dear Fillipo

Thats from Kagero 3D Booklet maybe it helps .

br David
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #18 on: 22 Jan , 2018, 10:31 »
Quote from: bianco64squalo on 22 Jan , 2018, 02:24
Thanks Snowman,
but there is a thing that I don't understand: if you look at the posted drawing, it seems that MBT 1 ( colored in green ) was large the whole hull, and not only between the two yellow lines of previous post: is this drawing wrong ?
And furthermore, is in your opinion the aft buoyancy tank ( colored in pink in the posted drawing ) correct in shape ?
Thanks in advance for replies....

The area for the MBT 1 looks Ok to me. The drawing is only of a single section of the boat.

The Aft buoyancy tank don't not look right to, I believe it should go to the top of the deck as it need to be able to vent.

You have to remember that all the tanks need a way to vent the air and water at the top and most are open directly to the sea at the bottom.
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Offline NZSnowman

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Re: Stern structure outside pressure hull
« Reply #19 on: 22 Jan , 2018, 10:35 »
Quote from: David83 on 22 Jan , 2018, 10:07
Dear Fillipo

Thats from Kagero 3D Booklet maybe it helps .

br David

David, great drawing!

It clearly show all the tanks and venting.

This summer in NZ I been working on the Saddle Tanks and is drawing clearly show all the key things with them  :)
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Offline David83

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Re: Stern structure outside pressure hull
« Reply #20 on: 22 Jan , 2018, 10:42 »
yes i hope i can help you in some things would be great to be a part of you fantastic 3D projekt NZ.

br David
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Offline David83

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Re: Stern structure outside pressure hull
« Reply #21 on: 22 Jan , 2018, 10:46 »
close ups

br David
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Offline bianco64squalo

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Re: Stern structure outside pressure hull
« Reply #22 on: 22 Jan , 2018, 12:15 »
Thanks Snowman for your patience, and thanks David for sharing new and useful drawings...
I’m waiting to receive the plans I ordered in Germany....
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