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Re: [PSUBS-MAILIST] Sea Scouts project videos
Hi Thierry,
Thanks for the details on the hull. One other thing you'll need to
consider is the type of steel used as well, since that could affect the
working depth. The hull and viewport calculators are at www.psubs.org.
Go to the main page. Select "Resources & Reference" from the top menu,
then select "Design & Fabrication", then select "Design Tools". On the
left side you'll see a link for "calculators". Click that and then you
can select the individual calculators.
Someone else will need to check my work with the ABS hull calculator on
the web site. I got 62 foot max depth using ".10" for the four ribbing
(web and flange) dimensions. I know the spreadsheet doesn't like 0 in
these spaces so you have to put something there. I also used "1" for
the usage factor in all calculations.
Jon
thierry labonté wrote:
Thanks for all your comments, advertising and honesty after viewing
the videos. A lot of questions have been asked trough those messages.
Let me try to answer all in a confused order!...
-The picture of the of the sub in working condition is from around
1983... but the last owner used it until the beginning of the 90'. He
stopped after his co-pilot and friend die...(in a car crash.) The sub
always worked well before this time.
-The hull is 15 feet long, 54 inches in diameter and about 6 tons
according to the last owner. The pressure hull is made, at my guess,
of ½ inch thick steel without ribbing inside. Allan gave me
an estimated weight of 8 tons and a crush depth of 228 feet,
considering a thickness of ½ inch. Jon, where is that hull-condition
tool on psubs website?
-The sub had been already carried by...a school bus, a pick-up truck
and even slowly by a Chrysler without any break under the trailer.
Naturally, this trailer is not legal anymore and will need to be fixed
or replaced.
-We will count on Pierre Poulain support and hundreds of calculations
to decide if this project is viable or not. We paid 2500$ CAN for the
sub... which is a cheap price for a Sub101 lesson without wasting our
time. We are planning to put another 15 000$ on it and probably more.
I am not confident to finish it before 3 years at least.
-We use to dive to a maximum depth of 250 ft in lake conditions. Usual
depth should be around 70-100 feet most of the time. So we need a
security crush depth of at least 500 feet.
-The last owner had a kind of floating dock made of 45 gal. plastic
barrels mounted on a frame, with a crank to launch and lift the
sub. We are searching for any photos of that. They used that structure
to flood the sub unmanned at 400 feet when they first buy it without
any crushing, only a slow leaking of the front port side viewport.
-The MBT is on the top and there is two droppable weights on each side
(which pound?) Two battery pods are under the hull.
We will wait the spring for more investigation and then we could bet
on the horse or not!
Thanks for your support and conselling.
Thierry
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