Need some info on diving...

[Mauser KAR98K]

Hey yall,


Need some info on diving. After the U-Boat has done it's intial dive, would it have to fill its ballast tanks more if they wanted to go deeper? And if so, do they release air back into the tanks to go up, but not surface??


Also, what are the procedures to submerge a U-Boat; I.E. what vents are operated?

Thanks

Mauser.

[Mush Martin]

in a standard dive
they would
flank ahead on the surface to build speed
down on the planes
under they go
switch to electric motors
level dive at something like 25 metres
trim ballast for neutral bouancy
and use planes and screws
to return to periscope depth.

filling tanks to negative to go deeper yes.
with motors to go faster.
like when the say Blow negative.
choices are negative positive and neutral.

GWX has a minor positive bouancy pulling you up
slowly to about two metres above ordered depth
MM

[Ducimus]

http://science.howstuffworks.com/submarine1.htm

[Brag]

With your boyancy near neutral, you control depth mainly with diving planes. To surface, you blow your ballast tanks and use compressed air for that to gain positive bouyancy. For emergency surface, you blow more ballast.

[RawRecruit]

You should try a bit of scuba diving...that way you get to experience the concepts first hand!

[Sailor Steve]

Originally Posted by Mush Martin

in a standard dive
they would
flank ahead on the surface to build speed
down on the planes
under they go
switch to electric motors
level dive at something like 25 metres
trim ballast for neutral bouancy
and use planes and screws
to return to periscope depth.

filling tanks to negative to go deeper yes.
with motors to go faster.
like when the say Blow negative.
choices are negative positive and neutral.

GWX has a minor positive bouancy pulling you up
slowly to about two metres above ordered depth
MM

Not true.
First the tanks are flooded to negative or neutral bouyancy.
Second power is switched to electric motors.
Third the planes are pointed downward.

In answer to the original question, once neutral bouyancy is established all depth changes are done with the dive planes. The ballast levels recieve minor adjustments if needed.

When surfacing, all water is blown out of the tanks. There is no ballast when surfaced.

[bigboywooly]

:rotfl:
Nice sig there Steve

[Sailor Steve]

Believe it or not, I first saw it on a T-shirt.

[Mush Martin]

Originally Posted by Sailor Steve

Not true.
First the tanks are flooded to negative or neutral bouyancy.
Second power is switched to electric motors.
Third the planes are pointed downward.

In answer to the original question, once neutral bouyancy is established all depth changes are done with the dive planes. The ballast levels recieve minor adjustments if needed.

When surfacing, all water is blown out of the tanks. There is no ballast when surfaced.

Well I certainly dont intend to argue with your level of experience steve
I stand corrected and will be more detailed and carful next time.
MM

[Sailor Steve]

No, by all means check sources. My sub experience is all from books, movies and games. I'm just going from what I've read. Challenge everything. I've been wrong many times.

[John Channing]

Originally Posted by Sailor Steve

Believe it or not, I first saw it on a T-shirt.

You must have followed him/her for five minutes to read it all!

JCC

[Sailor Steve]

I'll never tell.


Oh, wait, I tell everything; can never keep my mouth shut.

[Mauser KAR98K]

Thanks yall for the info.

[ridgewayranger]

Hi,
This applies to British pre Nuke boats.
Klaxon pressed on bridge or verbally,Dive the boat. This depends on whether the full crew is to be used or just the watch.
Main engines are stopped and motors started, Full ahead if Klaxon initiates the dive.
Planes Hard to dive.
Main vents opened in sequence from forrard to aft, if 'crash' dive is needed, Q tank is flooded and holds about 10 tons. As soon as boat starts down, Q must be blown, for obvious reasons. At depth ordered, OOW catches the trim by juggling water between trim tanks and reduces speed to conserve battery.
Depth changes are achieved by pumping and flooding internal tanks, planes and speed.
It may seem strange but when going very deep it is necessary to pump out water, because the compression of the hull reduces displacement and in effect makes the boat heavier.
Compressed air is only used for surfacing, and then only enough to get positive buoyancy. Full buoyancy is gained by starting a low pressure air pump known as the L.P.Blower, this is usually started before the hatch is opened, to remove excess air pressure in the boat( It has been known for the hatch opener to be blown clean out of the tower!) If the boat is in an uncontrollable dive ballast tanks will be blown completely, along with fervent prayers!!!
Having served in British S T & A classes as HSD (senior sonar rating) then TI ( senior rating in charge of Torpedo Department), I'd be glad to answer any questions, perhaps privately, to avoid boring those who already know it all.
RR.

[Sailor Steve]

Originally Posted by ridgewayranger

...to avoid boring those who already know it all.
RR.

Point that thing somewhere else!:rotfl:

On procedural subjects I'm always glad to defer to someone who's been there and done it.

Tell us more.