Re: [PSUBS-MAILIST] Re: Working Schematic, specifications

Hi Rick,

I'll explain and see if my (weenie brain) reasoning is correct.

120 cf total flood able interior space = 7680 lbs displacement

You wrote:

"Sorry, Joe, it's o'dark thirty right now and my brain is fogged. What do you mean by floodable INTERIOR space?"

If I am understanding what I have learned so far "floodable interior space" is the total displacement of the air volume that you are trying to submerge.

Soft Ballast Capacity = 325 gals seawater in 40.68 cf of tanks

This is the difference between dry weight and what would be required to submerge to neutral buoyancy. Quite frankly, I am having trouble determining how to look at it, whether soft water ballast is "increasing" weight or "decreasing" displacement or perhaps both?

That figure above is roughly the 30% ratio to interior volume for a seagoing boat as Carsten had pointed out. He had also pointed out that high volume soft ballast ratios are not unheard of as in this example so I am still playing with the idea. http://www.prismnet.com/~moki/20050322.141703/120tGlidingsub.jpg

But that drawing does not scale to those specs. It's a working "idea" sketch. If you want to maintain some degree of scale in a replica you run into these volume and length problems. What have you worked out for your Typhoon replica "Magical Child?"

Dans words keep ringing in my ears though and I believe it was you who suggested a "proof of concept" boat. I am seriously looking at downsizing even further to a two man craft or smaller. The S-boats at 219' by 20.6' could be scaled to roughly 1/10 and come to about 22' x 3'. A single cylinder diesel/electric would be damn cute!

This is a far cry from the original concept but a much more workable solution. As I said in an earlier post, ridiculous ideas will be discarded for workable solutions. I have the group to thank for that.

I'll reply to the aviation question off list.

Joe

From: "Rick and Marcia" <empiricus@telus.net>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Re: Working Schematic, specifications
Date: Sat, 19 Nov 2005 02:27:47 -0800

Hi, again . . . .

Yes, I was talking about the HP tanks, in this scenario, they are above the soft ballast tanks. I worry about the weight up high like that.

My only concern having cylinders that high is surface seakeeping, whether full or empty. So, I agree with you about the placement.

120 cf total flood able interior space = 7680 lbs displacement

Sorry, Joe, it's o'dark thirty right now and my brain is fogged. What do you mean by floodable INTERIOR space?

Soft Ballast Capacity = 325 gals seawater in 40.68 cf of tanks

Generally, I find it easier to avoid terms like "gallons" and stick with "cubic feet". A quick X64 lb. gives you a ready displacement in seawater. No conversions, room for error.

This is what my weenie brain has come up with for now.

Gevalt, your a Scotsman? ;-)

Rick

Vancouver