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

Ohh Boy! It just occured to me in looking at this link from Carsten that I would have to "reverse"

http://www.prismnet.com/~moki/20050322.141703/120tGlidingsub.jpg

the position of my ballast tanks to free flooding spaces in that drawing of mine! This solves the problems of lead ballast adjustments after launch and positioning of the hp cylinders! Not to mention stability and surfaced bouyancy issues for the structures below.

Thank you Dan H and Carsten!

Joe

From: "Joseph Perkel" <joeperkel@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Re: Working Schematic, specifications
Date: Sat, 19 Nov 2005 13:52:23 +0000

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

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