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Hi, Brian - going over old emails & noticed no
one responded to your, in my opinion, quite valid suggestion.
As you say about details . . . given that the
surface tanks are useless u/w, they really do add quite a bit of parasitic
entrainment. An opened bow (nose cone) or "torpedo" door would admit
water, an open "torpedo" door abaft of the aft tank would allow water to
exit. Flowing water would surround the pressure hull. Propellers
would be shielded aft of the pressure hull but within the water
flow.
A few years ago I was mulling over just that very
concept. I've admired the Ferrari 156 race car (not to mention the
McLaren's, etc.) from the 1960's to the point of wanting to convert a copy into
a . . . sub. I purchased a HotWheels F156, cut it up with my hack saw and
took sectionals from it. Hell I should have just spent $40 and bought
myself a plastic model.
I think the ambient dry/wet guys will drool over
these.
In your particular suggestion, the pressure hull
would have to be hydrodynamic. Fair enough (ooohh, bad pun).
Rick L
----- Original Message -----
Sent: Tuesday, November 15, 2005 12:52
AM
Subject: Re: [PSUBS-MAILIST]
"Frankenboot"
What if you had a large surface vessel that had a
large volume of air, say just a simple cylinder, like 6' in dia by 20'
long. That would give you quite a bit of floatation. But if you
tried to go submerged with that you would be having to move a very large mass
underwater. But what if you opened the ends of the cylinder wide open
and ran propultion through that space, then that space would not really be a
displacment factor. The only dispacement would be just the rim
of the cylinder. Turning might create problems but you might be
able to get around that somehow.
This might be a way to cheat your displacement of
a large surface vessel with out paying the price for the large mass under
water. The devil would be in the details.
My 2 cents
Brian
----- Original Message -----
Sent: Monday, November 14, 2005
15:55
Subject: Re: [PSUBS-MAILIST]
"Frankenboot"
Paul,
Yes, I found Dougs site some time ago, there's some pretty inspirational
stuff in there. It is all part of why I believe this to be possible.
And yes, the WWII boats have a shape that is much more practical for me
than my original idea and I don't need a double hull per see for the
ambient. Imagine a forward bow tank that could double as a vee berth! Large
volume, dual use, well baffled, waterproof roll up mats stowed for divening.
Fleet boat or U-boat, builders choice.
Is it doable? I don't know yet. I recently discovered the 444 cf hp
cylinder, kinda puts a little different spin on things. Long narrow shape
for a hull?, small compensated airspace for machinery?, four of those
444's?, money, time, effort...what precisely is possible?
Even though I had found it, thanks so much for the link Paul.
Joe
From: Paul Kreemer
<paulkreemer@gmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re:
[PSUBS-MAILIST] "Frankenboot"
Date: Mon, 14 Nov 2005
14:44:00 -0800
Boy I think I'd look at Doug Jackson's http://www.submarineboat.com
website first for comparisons. He's building a dry
ambient where
most of the SportSub's are wet ambient. Doug has a large
surface
cockpit/rear deck area which obviously floods when underwater
but which
provides a nice seating and cargo area while surfaced.
Doug's design looks different from most any other sub, and
different
from Joe's WWII look, but I think it has some great practical
ideas and
more similarities to what Joe is describing.
Paul
Rick,
This sub uses the main cabin as ballast tank http://www.ivccorp.com/
Here is proper use of the other suggestion http://pbskids.org/sesame/ernie/index.html
Thanks :)
Joe
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