BoatBanter.com - View Single Post - Any thoughts onhow to make this boat better

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