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91
Don.
Buoyancy tanks. In reply to your last post.
1. Yes, in bad weather surfaced having vents shut they increase the bow displacement when pitching, submerged vented, they are neutral as any non compressible material.
2. Yes, and reduce pitching movements.
3 No, the primary function of the aft buoyancy tank is to reduce pitching and increase displacement( buoyancy) , surfaced in bad weather, to counter act flooding of the Junker exhaust pipe.
The bow down angle assistance at passive diving is executed by main ballast tank 1 which is vented a bit later than the other main ballast tanks. The total bow down angle is achieved by speed and hydroplanes, dynamic, and the main ballast tanks ,passive. Both buoyancy tanks do not participate as they are vented prior to the diving order.
4. Normally both buoyancy tanks do not have any airpockets submerged as they are vented. The vents are shut after they are drained on the surface. If the weather  is bad you might speed up the surface drainage by shutting the vents and blow the tanks by LP air.
Tore
92
TYPE VII / Re: Bow external casing frames and structure
« Last post by falo on 09 May , 2017, 23:48 »
Hi SG, hi Filippo,


AFAIK Topher "only" finished the bow section than he stopped his report and never posted again here on AMP. I suppose I have captured then the meaningful pictures of his scratch build thread.


For completeness I have attached three pictures from Tophers thread which I haven't post yesterday.


Regards
falo


@ SG: Sorry for mixing things up here, you are right the scale of the scratch build is 1/35 not 1/48. Thanks for your hint.
93
TYPE VII / Re: Bow external casing frames and structure
« Last post by SG on 09 May , 2017, 22:31 »
yep, i guess the pics and most of his fabuolus thread are missing because of that loss of data happened some years ago on the forum. He was actually building the boat in the 35th scale! too bad that all those pics and information went missing
94
Hello Mr. Tore,


OK... So, If I understand the functionality of the bow ans stern buoyancy tanks, then the following statements are true.


1. Technically the bow and stern buoyancy tanks are not part of the ballast system because they are normally above the waterline and not affecting the U-Boat's overall displacement.


2. The bow buoyancy tank's primary function is to counter under cutting.


3. The stern buoyancy tank's primary functions are to assure the bow is in a down angle during a dive, and it's above the waterline for the Junker's air compressor operation.


4. Both the bow and stern buoyancy tanks are vented after a dive is initiated to eliminate the air pocket which will impact the decent rate slightly.


Comments?


Regards,
Don_
95
TYPE VII / Re: Bow external casing frames and structure
« Last post by bianco64squalo on 09 May , 2017, 06:47 »
Thanks again, Falo, but no one photo or drawing is still available on that post....
96
TYPE VII / Re: Bow external casing frames and structure
« Last post by falo on 09 May , 2017, 06:38 »
Hi Fillipo,


his correct nickname is TopherVIIC but he was never a registered member here, Topher always posted his work as a guest. Please follow that link:


http://models.rokket.biz/index.php?topic=871.0


Regards
falo
97
TYPE VII / Re: Bow external casing frames and structure
« Last post by bianco64squalo on 09 May , 2017, 05:13 »
Sorry, not Thore, but Topher....
98
TYPE VII / Re: Bow external casing frames and structure
« Last post by bianco64squalo on 09 May , 2017, 05:12 »
FOR ADMINISTRATORS:


Hi, I'd like to contact Thore, but he seems not to be present on Users list: is it possible ?
In past he made some scratching work that will be so much useful for my actual project: is it possible to contact him?
Thanks in advance.
Filippo
99
TYPE VII / Re: Bow external casing frames and structure
« Last post by bianco64squalo on 09 May , 2017, 05:00 »
Thanks Falo, this is U-Boat's fan collaboration....
100

Don.
The Germans did not use the wording tank or buoyancy for these tanks, they simply called it for what is was, watertight bow and watertight stern. Wasserdichte  bug and heck.
In the hand book for the uboatcommander you shall find the watertight bow and stern mentioned as per my enclosure. The English translation is a bit wierd trying to make german words english, but anyhow I guess it would explain that the germans did as we, leaving the buoyancy tank vents open submerged.
By the way I forgot to answer you question on my recent painting, of course you are free to used it in your Skizzenbuch. Allthough I am as old as your father in law was, going on 89, I never took any painting lessons.
Tore
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