Challenge 53 MT: Wet Navy Part 1 Help needed

[kaladorn]

Originally posted by Thomas Rux:
in the spreadsheet. Again thanks to both of you for your assistance to this slightly dim witted broken down old submarine sailor.

I can do a bit of math, a bit of computer stuff, and even a bit of surface sailing (taking Coastal Nav course right now). But I have a lot of respect for the Silent Service. That takes something I don't know if I have... but I know that I respect.

Any more questions, you know where to find me.

 

[snrdg082102]

Thanks kaladorn that does clear-up my confusion, until I run into something else. Between you and TheDS I think I can push forward in the spreadsheet. Again thanks to both of you for your assistance to this slightly dim witted broken down old submarine sailor.

Originally posted by kaladorn:
Okay, I think I've got it.

You're staring with a 60 dTon hull.
It's nominal weight is 31.6 tons.
But, made out of fancy laminates, 0.35 times that.
A standard 1 cm hull thickness doesn't change anything.
So you have a hull weight of just over 11 tons.
That hull weight wraps a space that would (normally) be 100% of 13.5 meters cubed per dTon, or 810 kl. Because it is a sub, 10% is actually ballast tanks which can be water filled, so you count 90% of that. Which means 729 kl. That displaces (assuming the only slightly bogus rating of) 1 metric ton per kiloliter for seawater. So that means it displaces 729 metric tons worth of water.

So, we have an 11 ton object displacing 729 tons of water. Methinks it floats.

Note, I wouldn't have actually used the 11 ton weight though, myself, because that only includes hull weight. Once you populate it with combat systems, a power plant, a propulsions system, crew quarters, etc, it ought to be one *heck* of a lot heavier than 11 tons. Still probably won't reach 729 tons, so it'll probably still float. But just using the hull weight is a bit dubious.

That clear things up at all?

 

[snrdg082102]

Thanks kaladorn that does clear-up my confusion, until I run into something else. Between you and TheDS I think I can push forward in the spreadsheet. Again thanks to both of you for your assistance to this slightly dim witted broken down old submarine sailor.

Originally posted by kaladorn:
Okay, I think I've got it.

You're staring with a 60 dTon hull.
It's nominal weight is 31.6 tons.
But, made out of fancy laminates, 0.35 times that.
A standard 1 cm hull thickness doesn't change anything.
So you have a hull weight of just over 11 tons.
That hull weight wraps a space that would (normally) be 100% of 13.5 meters cubed per dTon, or 810 kl. Because it is a sub, 10% is actually ballast tanks which can be water filled, so you count 90% of that. Which means 729 kl. That displaces (assuming the only slightly bogus rating of) 1 metric ton per kiloliter for seawater. So that means it displaces 729 metric tons worth of water.

So, we have an 11 ton object displacing 729 tons of water. Methinks it floats.

Note, I wouldn't have actually used the 11 ton weight though, myself, because that only includes hull weight. Once you populate it with combat systems, a power plant, a propulsions system, crew quarters, etc, it ought to be one *heck* of a lot heavier than 11 tons. Still probably won't reach 729 tons, so it'll probably still float. But just using the hull weight is a bit dubious.

That clear things up at all?

 

[snrdg082102]

Thanks kaladorn that does clear-up my confusion, until I run into something else. Between you and TheDS I think I can push forward in the spreadsheet. Again thanks to both of you for your assistance to this slightly dim witted broken down old submarine sailor.

Originally posted by kaladorn:
Okay, I think I've got it.

You're staring with a 60 dTon hull.
It's nominal weight is 31.6 tons.
But, made out of fancy laminates, 0.35 times that.
A standard 1 cm hull thickness doesn't change anything.
So you have a hull weight of just over 11 tons.
That hull weight wraps a space that would (normally) be 100% of 13.5 meters cubed per dTon, or 810 kl. Because it is a sub, 10% is actually ballast tanks which can be water filled, so you count 90% of that. Which means 729 kl. That displaces (assuming the only slightly bogus rating of) 1 metric ton per kiloliter for seawater. So that means it displaces 729 metric tons worth of water.

So, we have an 11 ton object displacing 729 tons of water. Methinks it floats.

Note, I wouldn't have actually used the 11 ton weight though, myself, because that only includes hull weight. Once you populate it with combat systems, a power plant, a propulsions system, crew quarters, etc, it ought to be one *heck* of a lot heavier than 11 tons. Still probably won't reach 729 tons, so it'll probably still float. But just using the hull weight is a bit dubious.

That clear things up at all?