Trim weight

_Seth_ · 02-02-07, 05:43 PM

What if Bernard was on the toilet, releasing the last 14 (!) days of crap into the ocean? Wouldnt the boat pop to the surface like a cork? Or was toilet-patrols only allowed when surfaced?

Jimbuna · 02-02-07, 07:44 PM

Trimming the boat was an art that took a long time to master

Iron Budokan · 02-02-07, 08:09 PM

You're not kidding especially when you're talking about those kinds of tolerances (only a hundred pounds!) compared to the entire weight of the boat itself! Wow.

No doubt about it, it's a tightrope of sorts...

Iron Budokan · 02-02-07, 08:11 PM

A quick calculation shows that a hundred pounds of potatoes is 0.05 tons. Seemingly nonexistent compared to the 865 tons of a submerged VIIC! That's only a difference of 0.0058% between stabilization and falling to crush depth.

Again....wow!

Brag · 02-02-07, 10:45 PM

Quote:

Originally Posted by Iron Budokan

A quick calculation shows that a hundred pounds of potatoes is 0.05 tons. Seemingly nonexistent compared to the 865 tons of a submerged VIIC! That's only a difference of 0.0058% between stabilization and falling to crush depth.

Again....wow!

Neutral bouyancy is a delicate balance, even the salinity of water will affect it. Some U-boats in the Baltic had problems in the spring time when a lot of fresh water from the rivers ran into the sea.

When I had a sailboat in San Francisco Bay, when sailing up the San Joaquin river, my boat would sit a good 10 centimeters lower in the fresh water than at sea.

Iron Budokan · 02-03-07, 01:16 AM

That's true. Even a sunny day affects the salinity of the ocean, driving off evaporation and increasing the salt content, thereby affecting the specific gravity of the sub itself. In Das Boot (the novel, not the film) Buchheim tells how every day they tested the density of the ocean water because it had such a big factor on trim weight.

It's much more complex than just flooding trim tanks, that's for sure. Much more complex than I originally imagined....a LOT of chemistry and physics involved. Pretty cool.

Myxale · 02-02-07, 08:13 PM

The ever so famous "Prüfungstauchen" is pure mojo!:hmm:

Brag · 02-02-07, 10:37 PM

Quote:

Originally Posted by _Seth_

What if Bernard was on the toilet, releasing the last 14 (!) days of crap into the ocean? Wouldnt the boat pop to the surface like a cork? Or was toilet-patrols only allowed when surfaced?

Now, stop it! I almost fell off my chair laughing :rotfl: :rotfl:

02-02-07, 05:43 PM	#1
_Seth_ Ocean Warrior Join Date: Dec 2005 Location: In Tromsoe, @Tirpitz' final resting place.. Posts: 3,277 Downloads: 94 Uploads: 0	What if Bernard was on the toilet, releasing the last 14 (!) days of crap into the ocean? Wouldnt the boat pop to the surface like a cork? Or was toilet-patrols only allowed when surfaced? __________________

02-02-07, 07:44 PM	#2
Jimbuna Chief of the Boat Join Date: Feb 2006 Location: 250 metres below the surface Posts: 190,526 Downloads: 63 Uploads: 13	Trimming the boat was an art that took a long time to master __________________ Wise men speak because they have something to say; Fools because they have to say something. Oh my God, not again!!

02-02-07, 08:09 PM	#3
Iron Budokan Sea Lord Join Date: Dec 2006 Location: Texas Posts: 1,778 Downloads: 32 Uploads: 0	You're not kidding especially when you're talking about those kinds of tolerances (only a hundred pounds!) compared to the entire weight of the boat itself! Wow. No doubt about it, it's a tightrope of sorts... __________________ "You will take on England wherever you find her ships, and you will break her power at sea." --Iron Coffins, Herbert A. Werner http://kennethmarkhoover.com

02-02-07, 08:11 PM	#4
Iron Budokan Sea Lord Join Date: Dec 2006 Location: Texas Posts: 1,778 Downloads: 32 Uploads: 0	A quick calculation shows that a hundred pounds of potatoes is 0.05 tons. Seemingly nonexistent compared to the 865 tons of a submerged VIIC! That's only a difference of 0.0058% between stabilization and falling to crush depth. Again....wow! __________________ "You will take on England wherever you find her ships, and you will break her power at sea." --Iron Coffins, Herbert A. Werner http://kennethmarkhoover.com

02-03-07, 01:16 AM	#6
Iron Budokan Sea Lord Join Date: Dec 2006 Location: Texas Posts: 1,778 Downloads: 32 Uploads: 0	That's true. Even a sunny day affects the salinity of the ocean, driving off evaporation and increasing the salt content, thereby affecting the specific gravity of the sub itself. In Das Boot (the novel, not the film) Buchheim tells how every day they tested the density of the ocean water because it had such a big factor on trim weight. It's much more complex than just flooding trim tanks, that's for sure. Much more complex than I originally imagined....a LOT of chemistry and physics involved. Pretty cool. __________________ "You will take on England wherever you find her ships, and you will break her power at sea." --Iron Coffins, Herbert A. Werner http://kennethmarkhoover.com

02-02-07, 08:13 PM	#7
Myxale Admiral Join Date: Feb 2006 Location: PQ AN 25 Posts: 2,178 Downloads: 70 Uploads: 0	The ever so famous "Prüfungstauchen" is pure mojo!:hmm: __________________ SH3+GWX SH5+WoS Still Sailing....still Deep