Hi Les,
In regards to subs sitting higher in the water, four examples come to mind; the Hypersub, the SubCat S-30 tourist subs, Uboat Worx subs, and Simon Lake's Argonaut II configuration. I'm not sure if the new boat type fairings on the Argonaut II were just for being more sea worthy on the surface or if they also lift the subs main hull up some as well. Raised decks appear to be installed according the the information below. Perhaps Jay might know.
"Lake completed Argonaut I in 1897 and after a series of local trials, he began using the boat to salvage sunken cargoes in the Chesapeake Bay. Then in 1898, he took the boat into the open ocean, first for a limited excursion off Cape Henry, Virginia, and then for a longer cruise in which he sailed from Norfolk to Sandy Hook, New Jersey. Lake traveled largely on the surface but submerged regularly to investigate promising wrecks along the way, and when a serious storm blew up, he rode it out safely on the bottom. This feat appears to have been the first substantial ocean-going voyage by a submersible craft, and it earned Lake a telegram of congratulations from none other than Jules Verne himself.
Because its open-ocean voyage showed that Argonaut I needed to be more seaworthy, Lake had the vessel rebuilt the following year in Brooklyn, New York, largely by lengthening the boat to 56 feet and adding a flooding, schooner-like superstructure for better surface performance. The resulting submersible was dubbed New Argonaut, or Argonaut II"
http://www.navy.mil/navydata/cno/n87/usw/issue_16/simonlake.html
|
"December 1898, Simon brought his little Argonaut to New York to be
enlarged and re-outfitted with a variety of improvements including
greater buoyancy, deck space, fuel capacity, a 60 HP engine and living
quarters for a crew of eight. A searchlight was added in the bow to
light up the fore-coming pathway, and telephones were installed
throughout, so that conversation could be conducted between the divers
and their tenders, with crew members stationed at different parts of
the boat, with the surface or with the shore. |
|
Reconstructed by July 1900, the Argonaut II was 66 feet in length and
capable of making a non-stop sea voyage of 3000 miles, and submerging
for 48 hours. The new Argonaut looked quite different than the original
one with the new raised deck that made the vessel appear more like a
surface boat than a submarine." |
www.hyper-sub.com
Also notice they have changed the bow configuration of the hypersub and added some tubes to the sides of the amas for some reason. They remind me of the PVC capped tubes Karl installed on C-BUG for a short time until one imploded at depth and scared the L out of him.
http://www.subcat-fuerteventura.com/
http://www.subcatantigua.com/about.htm
http://www.janes.com/articles/Janes-Underwater-Security-Systems-and-Technology/Subcat-Spain.html
Regards,
Szybowski
From: ShellyDalg@aol.com
Date: Tue, 16 Jun 2009 01:42:23 -0400
Subject: Re: [PSUBS-MAILIST] franks sub
To: personal_submersibles@psubs.org
Hi Les. No, I got that message. The shape of the MBT's are a little
deceptive. The majority of the floatation is pretty high. The portion that's
below the center is narrow and is designed to perform like the hull of a skiff
when the boat is surfaced. The models I used allowed me to fill the tanks with
water and I used lead weights ( and some magnets ) inside the pressure
vessel portion to achieve "neutral" buoyancy.
With the same weights but empty tanks the water line comes to about 8
inches above center. This makes the water line fall about 2 inches above the
bottom of the 12 inch windows when it's just sitting on the surface.
Now just how accurate the models are at simulating the real thing is
something I won't know until I do my first float test. Frank D.