From: vbra676539@aol.com
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] RE: MSV Alvin Jr. Update
Date: Wed, 15 Nov 2006 16:34:17 -0500
Joe,
I like the looks of this thing a LOT, even with the forward overhang. What
if you shortened it to maybe a foot or so? George's original designed tanks
have about the same total buoyancy you're talking about, so it ought to
work. The "brow" is, of course, a time honored way to do things, primarily
on the deeper boats. Look at the Pisces, for instance, which has a pair of
32" spheres up there as part of the trim system.
As you said, however, that kills a bunch of forward/down visibility. How
about main saddle tanks six inches wider than the hull on each side like
PC-8? What would that give you? You could run your thrusters on extensions
to get out far enough, or mount them forward within the same fore and aft
footprint and pivot both of them with one hand!!! Just make them
reversible.
Side Note: Don't worry about the lift. She may tip down some, but let me
tell you, I've hauled some MONSTROUS stuff up on occasion, and managed it
pretty well.
Second Side Note: Of course, if the saddles were split athwartships, or
built as four seperate half-tanks, then you could control that nose down
attitude more easily.
Vance
-----Original Message-----
From: joeperkel@hotmail.com
To: personal_submersibles@psubs.org
Sent: Wed, 15 Nov 2006 1:44 PM
Subject: [PSUBS-MAILIST] RE: MSV Alvin Jr. Update
I forgot to post the link itself..... http://www.frappr.com/psub
>From: "Joseph Perkel" <joeperkel@hotmail.com>
>To: joeperkel@hotmail.com
>Subject: MSV Alvin Jr. Update
>Date: Wed, 15 Nov 2006 18:41:55 +0000
>
>I have posted some new views of the latest changes, to my version of the
>K-350, on my frappr.com/psub account. Some of this I did while having the
>flu, mainly the stern section which must be redone as a result, the
>fairings do not â??fairâ?? well at the juncture, and soft ballast under
is not >quite right.
>
>The intent here is to give this little guy massive amounts of buoyancy on
>the surface, so as not to swamp the hatch in 3' swells along the coastal
>littoral environment...... This is not proving to be an easy task. Seeing
>video of both Alec and Dan on the surface, confirms in my mind the
>necessity of this additional buoyancy for ocean use.
>
>As Vance pointed out, you give up one thing to gain another, very tough
>choices. Originally, the idea for these saddle tanks was to hopefully
>dispense entirely with all of the bow structures, ala PC-8, in order to
>gain forward line of site visibility from the sail. ...Well, that gives
up >too much available under waterline lift, without the use of massive
>saddles, which created more problems. Ah, and what to do about that
massive >space behind the aft viewport?...an emergency buoy on a reel
perhaps?
>
>As it is, these volumes (saddle tanks) are 5 cf each for a total of 640
lbs >reserve buoyancy. Note the shape in the forward view, that airspace is
>designed to resist (hopefully), the gunwales from being pushed under
while >rolling, this results from comments by both Jay and Vance. I cannot
>overstress my appreciation for comments and suggestions regarding
>improvements.
>
>Another consideration, and perhaps someone can qualify this or disprove
it. >I wondered that if I lost the forward MBT, would I ever be able to
lift >something substantial with the claw? Seems to me that forward MBT is
a >natural â??lift bagâ??, should you just â??happenâ?? across a 50 lb
clump of the >Queens silver!
>
>Note the scale figures in position. These are based on my height of 5' 11
>½", and boy...is it tight in there! Eventually, I will scale this to a
42" >hull diameter and recalculate displacements and weights out of
curiosity.
>
>Iâ??m astounded by the amount of detail work that will be required by the
>time a concept is finally hashed out. Each component will need detail
>drawings of itâ??s own, including attach points and hardware.
>
>As always, I welcome comments for improvements / oversights.
>
>Joe
>
>
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