Rick,
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.
Incidentally, here are the target specifications for this boat.
Specifications
120 cf total flood able interior space = 7680 lbs displacement
1000 lbs external structures = 8680 total displacement
Target dry weight = 6076 lbs
Soft Ballast Capacity = 325 gals seawater in 40.68 cf of tanks
This is what my weenie brain has come up with for now.
Joe
From: "Rick and Marcia" <empiricus@telus.net>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Working Schematic
Date: Wed, 16 Nov 2005 19:57:48 -0800
"I think I could get away with the bottles up this high then"Hi, Joe - I assume you mean scuba tanks or high volume compressed air tanks (like welding tanks).When you say "up this high", what do you have in mind?RickVancouver----- Original Message -----From: Joseph PerkelSent: Wednesday, November 16, 2005 7:23 PMSubject: [PSUBS-MAILIST] Working SchematicNow that was truly nice of you to do, thank you Paul!
These boats do not scale down well. This is an idea drawing (one of several) just to do some math with. This one is near scale in this view. Something like what you drew is probably more practical scale wise. I would like some manner of getting in and out on the bottom.
Yes the glassed marine ply would give me quite a righting moment. I think I could get away with the bottles up this high then.
As for the rest, well...one thing at a time.
Joe
If this file didn't post, I will try another format. (second try jpg format)
From: Paul Kreemer <paulkreemer@gmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Free Flooding Spaces
Date: Wed, 16 Nov 2005 11:09:20 -0800
Joe, I think we need some drawings! I've been following this message thread but am not sure the kind of boat you're after. Here's a rough layout sketch of a sub that I spent a few minutes on. It looks maybe a little like a fleet boat, but I didn't try to do much with the free flooding spaces (in white). I also didn't try to apply any scale to it - so it may be way off.
But there's a lot of floodable space here, like you described earlier. This first sketch of mine has a lot of problems: usable viewports, access to and use of free-flooding space, overall size and power requirements, lots of stuff.
Regarding your surface buoyancy question, my impression was always that you had loads of buoyancy and maybe had issues more with just getting it to sink and having adequate propulsion and control with such a large amount of free-flooding volume. But hopefully some more experienced designers can comment.
Paul
On 11/16/05, Joseph Perkel <joeperkel@hotmail.com> wrote:
Paul & Dan (ref: your reponses below)I need to cut total interior floodable space by at least half. What everyone's been telling me has sunk in, the numbers aren't lying. Myles was correct, it's either a sub or a glass bottom boat.
If one where to consider the free flooding fairing idea more
closely, how do you provide sufficient surface buoyancy for the structure without running into the same problems all over again?These WWII boats do not "scale' down well and a short and stubby
"caricature" shape would actually be easier to control. Damn problems keep rearing their ugly little heads!Joe
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