[PSUBS-MAILIST] Seehund Aft Dive Tank

["Carsten Standfuß " via Personal_Submersibles]

Hi Joe the Seehund has some quite funny system. 

01)  No there is no double hull in the aft. 

02) Yes both dive tanks has the vents on the aft and highest point for
quick diving. From command "dive" to get underwater was 10 seconds. 

03) The j trap is the outlet of the blow air line. 

The Seehund surface the following way: 

Close vent vale, blow a little compress air to the blow out line, until
the diesel snorckel surface. Drive the diesel with the main e-motor as
compressor and blow the dive tank with this  gas complete. out. 

Another way was : (mostly use by the crew but more or less ilegal : Run
the boat dynamicly to the surface , start the diesel and blow the tanks
with the exhaust gas. 

Both ways were developt to safe on compress storage gases. 

04) No idea. 

vbr Carsten

rkel via Personal_Submersibles" <personal_submersibles at psubs.org>
schrieb: 
As an example of my delving into this particular subject, I am having a
bit of trouble trying to understand the nature of the aft diving tank
(No.1) on the original Seehund. Understanding this well, is key to an
appropriate attempt for a viable facsimile.


I've attached an image of where I'm unclear. I suspect that the
uppermost volume of this tank was encased in what looks like a double
hull void, but I can not quite confirm this. Also in question are the
following with my analysis, supposition or questioning.




1) Is this a double hull in this aft conical section?   (Raising CB,
lowering CG)
2) Position of the vent valve?    (Is this due to dive angle?)
3) "J" trap nature of bottom of assembly in keel section of tank?   
(Anti-syphon?)
4) Coiled hose assembly in section view?? (completely at a loss here?)


Comment's and suggestions are sincerely appreciated. What's on my mind
is the temptation and viability of reproduction in reduced scale. Sea
Hunter's lines are pleasing and close to scale in section @ 36"OD for
the hull, 24" for the CT/Sail assembly and No. 14 pipe for the
torpedo/battery pod assemblies. (Can get away with No. 12 as well).


Cliff's wonderful .xls requires that I draw up an accurate model first
in order to simulate ballasting.


Joe


 
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