"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.

--
Duncan

"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.


Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' .

Thanks for playing.

SBV

In article ,
says...

"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.


Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' .

Thanks for playing.

Water - ROTFL.

No, subs sink cos either they're heavier than water in the first place,
or they use ballast that is heavier than water such as: Lead, or for
modern wartime subs I would think they'd use DU (depleted uranium).

Water! - LOL.

So the correct answer is most assuredly not water. Subs are made so
that the mass/volume is denser than that of water - and they sink. They
then have *AIR* in them that provides bouyancy - the cool thing about
air is it's *compressability*. The "blow the (air) tanks" - and the
decrease in bouyancy means they sink. To surface, they blow the water
*out* of the air tanks, filling 'em with the air from the compressed air
source.

Think of a diver - FFS. They sink because of? Same as a sub - only as
said, I would think modern war subs use denser material such as DU -
'cos they can afford it.

So the correct answer is lead or DU.

--
Duncan

In article ,
says...

"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.


Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' .

Thanks for playing.

Water - ROTFL.

No, subs sink cos either they're heavier than water in the first place,
or they use ballast that is heavier than water such as: Lead, or for
modern wartime subs I would think they'd use DU (depleted uranium).

Water! - LOL.

So the correct answer is most assuredly not water. Subs are made so
that the mass/volume is denser than that of water - and they sink. They
then have *AIR* in them that provides bouyancy - the cool thing about
air is it's *compressability*. The "blow the (air) tanks" - and the
decrease in bouyancy means they sink. To surface, they blow the water
*out* of the air tanks, filling 'em with the air from the compressed air
source.

Think of a diver - FFS. They sink because of? Same as a sub - only as
said, I would think modern war subs use denser material such as DU -
'cos they can afford it.

So the correct answer is lead or DU.

--
Duncan

http://express.howstuffworks.com/express-submarine1.htm



How Submarines Sink & Swim
To dive underwater and then resurface, the submarine's crew must
be able to control the ship's weight or density. We can compare
this to an empty can floating in the water. The empty can could
become more "rock-like" and sink by pouring water into the can.
By controlling the amount of water we pour into the can, we can
control the rate and depth of its dive under the water's surface.


Submarines have an inner and an outer steel shell, called a hull.
The area in between the two hulls is called the ballast tank. It
can be filled with either air or water. When the submarine is on
the surface, the ballast tanks are filled with air and the
submarine's overall density is less than that of the surrounding
water.

Ballast tanks are open at the bottom. To dive, the submarine
operator opens up valves at the top and lets air out. It's
something like blowing bubbles when you are swimming underwater.
Seawater rushes in to fill the space that was taken up by air.
This changes the ship's density.

When the density of the submarine is greater than the surrounding
water, it begins to sink. This is called negative buoyancy. A
moveable set of wings, called hydroplanes, helps control the
angle of the dive.

To keep the submarine at any specific depth, the crew adjusts the
mixture of air and water in separate, smaller ballast tanks. The
operator tries to keep the submarine's overall density about the
same as the surrounding water. This is called neutral buoyancy.
When the submarine reaches its cruising depth, the hydroplanes
are straightened so the craft can travel level through the water.
If something changes the submarine's weight and density, such as
firing torpedoes, the operator must make further adjustments of
the water/air mixture in the ballast tanks.


"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can
you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.


Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' .

Thanks for playing.

Water - ROTFL.

No, subs sink cos either they're heavier than water in the
first place,
or they use ballast that is heavier than water such as: Lead,
or for
modern wartime subs I would think they'd use DU (depleted
uranium).

Water! - LOL.

So the correct answer is most assuredly not water. Subs are
made so
that the mass/volume is denser than that of water - and they
sink. They
then have *AIR* in them that provides bouyancy - the cool thing
about
air is it's *compressability*. The "blow the (air) tanks" -
and the
decrease in bouyancy means they sink. To surface, they blow
the water
*out* of the air tanks, filling 'em with the air from the
compressed air
source.

Think of a diver - FFS. They sink because of? Same as a sub -
only as
said, I would think modern war subs use denser material such as
DU -
'cos they can afford it.

So the correct answer is lead or DU.

--
Duncan

http://www.fleetsubmarine.com/diving.html


To submerge, the crew opens vents at the top of the ballast
tanks. This lets the air out. The bottom of the ballast tank is
open to the sea, so as soon as the air is released water comes in
to take its place, the displacement increases, and the boat slips
below the surface.

Submarines are designed so that, with the main ballast tanks
full, the weight of water they displace will be as close as
possible to exactly equal to the weight of the boat. In practice,
the boat should retain a slight amount of positive buoyancy, so
that it will want to slowly rise to the surface if nothing else
acts to keep it under.









"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can
you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.


Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' .

Thanks for playing.

Water - ROTFL.

No, subs sink cos either they're heavier than water in the
first place,
or they use ballast that is heavier than water such as: Lead,
or for
modern wartime subs I would think they'd use DU (depleted
uranium).

Water! - LOL.

So the correct answer is most assuredly not water. Subs are
made so
that the mass/volume is denser than that of water - and they
sink. They
then have *AIR* in them that provides bouyancy - the cool thing
about
air is it's *compressability*. The "blow the (air) tanks" -
and the
decrease in bouyancy means they sink. To surface, they blow
the water
*out* of the air tanks, filling 'em with the air from the
compressed air
source.

Think of a diver - FFS. They sink because of? Same as a sub -
only as
said, I would think modern war subs use denser material such as
DU -
'cos they can afford it.

So the correct answer is lead or DU.

--
Duncan

In article ,
says...

"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.


Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' .

Thanks for playing.

Thanks for your worthless (top posted) posts and links re subs. They
point out what I have already - that subs sink because their overall
density is greater than that of the water they are in.

They DO NOT SINK BECAUSE OF WATER!!! - and none of those articles you
posted suggest they do. They simply describe the bouyancy mechanism
subs use to go up or down in the water.

Like I also suggested to you - why don't you try thinking of something
simpler - such as a diver.

Even a simpleton like you should be able to work out that, just like a
sub, a diver has a bouyancy device - the BCD. However it is of no use,
no matter how much air you drain from it, or replace with water - if the
diver is not wearing their weight belt.

Thanks for the laughs though.

--
Duncan

Dave, stop trying to change your statements (and stop bottom
posting).
You stated that subs don't use water for ballast.
I posted a few, out of many, sites that state otherwise.



--
Scott Vernon
Plowville Pa _/)__/)_/)_



"Dave Doe" wrote in message
z...
In article ,
says...

"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can
you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.


Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' .

Thanks for playing.

Thanks for your worthless (top posted) posts and links re subs.
They
point out what I have already - that subs sink because their
overall
density is greater than that of the water they are in.

They DO NOT SINK BECAUSE OF WATER!!! - and none of those
articles you
posted suggest they do. They simply describe the bouyancy
mechanism
subs use to go up or down in the water.

Like I also suggested to you - why don't you try thinking of
something
simpler - such as a diver.

Even a simpleton like you should be able to work out that, just
like a
sub, a diver has a bouyancy device - the BCD. However it is of
no use,
no matter how much air you drain from it, or replace with
water - if the
diver is not wearing their weight belt.

Thanks for the laughs though.

--
Duncan

In article ,
says...
Dave, stop trying to change your statements (and stop bottom
posting).
You stated that subs don't use water for ballast.
I posted a few, out of many, sites that state otherwise.

a.
Indeed they do not. They probably use Lead or DU. Neither of those
sites w' the info you posted conclude that subs use water for ballast -
one mentions the key fact, a sub is denser than water. The bouyancy
ballast tanks are then regulated with air to adjust density and float or
sink as required. The water in the bouyancy ballast tanks serve only to
displace the air - and it's ideal as it has the same density as the
water the sub is in (and that alone should tell you, it can never make
the sub sink!)

b.
You are referring to the bouyancy ballast tanks - diphead! That is
*not* "the ballast". Equivalent to a diver's BCD.

c.
Without the ballast at the bottom of a sub (as said, I believe it will
be Lead (or DU for modern war subs)), OR the construction itself -
producing a vessel that is denser than water (mass/volume) - the sub
will not sink!

Just like a diver without a weight belt.

And PS: the only reason subs replace the air with water in the bouyancy
ballast tanks is because they are solid tanks - the water is irrelevant.
(A diver's BCD is not replaced with water, as it's a rubber bag that
simply deflates).

--
Duncan