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Old 09-14-16, 06:08 AM   #1
Catfish
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Support Someone knows the order of diving actions..

.. of a WW2 type VII boat?

1. under normal conditions
2. in a crash dive

What i'd like to know is what is done first, and if someone knows by whom of the crew..
Please let me know if i left something out, or correct me.


e.g. under normal conditions the captain wants the boat to dive to say 30 meters, "low and slow".
So captain or LI or the officer of the watch (?) would call out "Auf Tauchstation!" ~ "Man diving stations!", and the crew would act accordingly.

Hatch will be closed.

Diesels have to be stopped and uncoupled from the propshafts, the electric engines have to be coupled to the propshafts (or switched to electric engines from generator mode, if they were charging), and set to half or full ahead.

The Diesel air intake valves (head and foot ones) have to be closed, also the exhaust valves.

Dive planes fore and afte have to be set for diving, like "vorne unten x, hinten unten x" where x is the degree of angle.

With the command "Fluten!" ~ "Flood (the tanks)!" the main ballast tank upper valves have to be opened, to let the air escape and let water in from the foot valves. The lower valves were usually kept open, to improve the diving time.

The "Untertriebszellen" ~ "negative buoyancy tanks" would be already flooded, with lower valve open and upper valve closed. So they can be blown out right after the boat reaching 10-12 meters.

As soon as the boat reaches 10 meters the LI would order "Untertriebszellen ausblasen!" ~ "Blow negative buoyancy tanks!".

Then the fore and after dive planes would be adjusted to get the right diving angle of maybe 10-15 degrees, in a normal dive.

Short before reaching 30 meters the dive planes would be adjusted accordingly ("Vorne oben x, hinten oben x!") and the boat brought to level keel, while at the same time closing the main ballast tanks' upper valves to be able to blow them later, for ascending.
Trim tanks would be used to keep the boat straight and level, at said depth.

Then the boat would be trimmed for level cruising using the trim cells pumping water fore and/or aft, usually the bow a bit lower and the rear dive planes a bit 'up'. At least this is what Werner and others wrote, about crusing at depth.


Would this be the usual procedure for diving?

Thanks and greetings,
Catfish


OT does someone have the eMail address of Paul, who we met at Laboe? I would like to order some of the magazines he showed to us, and maybe ask some technical questions. Have no fear, I will not spam him with mails or molest him
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Last edited by Catfish; 09-15-16 at 02:58 AM.
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