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RE: [PSUBS-MAILIST] Launch Retrieval Transport
I use for this porpose an old sailboat mast from aluminium with
the length of the trailer - and stored on the trailer. With Towinghook on the one side and cuppling on the other.
regards Carsten
"Smyth, Alec" <Alec.Smyth@compuware.com> schrieb:
> Believe it or not I can't find a photo of the extended trailer tongue.
> But it's extremely simple. The trailer has a longitudinal square tube
> running almost it's entire length. It's strong, probably 4" square and
> 0.25" thick walls. The square tube is integral to the trailer. Inside
> that is a slightly smaller one, and inside that a third. All are 0.25"
> walled, strong enough that you can apply some serious towing power
> without any fear of bending it, even when extended. So two of the three
> tubes slide freely. There are a couple of holes drilled through all
> three tubes, to take large pins (0.5" diameter) that prevent the loose
> tubes from pulling out. To extend the tongue, you pull the pins, chock
> the wheels, and drive the car forward. It does take some back and forth
> until you line up the holes again to reinsert the pins, but nothing
> major. You should have seen the support team by the end of the
> convention, they had it down like a pit crew. I've painted the pull-out
> tubes red when they have gone too far, so the driver essentially pulls
> them out until red paint is spotted.
>
> It's something like this, except much longer and with two tubes one
> inside the other:
> http://shop.easternmarine.com/index.cfm?fuseaction=catalog.prodInfo&prod
> uctID=5268&categoryID=226
>
> The trailer has a flat aluminum deck, on which I've bolted two long
> pieces of plastic square bars which are machined so their surfaces slant
> inward. They help guide the sub into the center of the trailer deck and
> hold it there. There is also a forward stop, placed so that when the
> mechanical grabber on the sub rests against it, the sub is balanced
> properly fore and aft. So the trailer deck is "closed" on three sides.
>
> With this arrangement, I get into the sub on land and someone backs the
> trailer down the ramp. When the sub floats, I motor off with the
> thrusters. For recovering the sub, I motor over the trailer deck until
> the mechanical claw touches the forward stop. The K250 front viewport is
> perfectly located to see when that happens. The truck pulls the trailer
> up the ramp very slowly, with me following by using thrusters until the
> trailer takes the sub's weight. This technique I'm using now is a slight
> improvement over what I did at the convention, which was to attach a
> strap to the bow before moving the trailer up the ramp. Now I launch and
> retrieve without either pilot nor crew getting wet. My next enhancement
> is going to be painting a line on the deck to help guide me to the front
> stop in low visibility.
>
> Both Mark Ragan and Dan H use trailer tongues, but the difference is
> that theirs are lightweight, while mine is very heavily built. I'm not
> sure which approach is better, all three seem to work just fine.
>
> I do have this on video, so if anyone wants to see it I can just take a
> still frame from that.
>
>
> cheers,
>
> Alec
>
> ________________________________
>
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Nomdae Plume
> Sent: Monday, November 06, 2006 5:52 PM
> To: personal_submersibles@psubs.org
> Subject: RE: [PSUBS-MAILIST] Launch Retrieval Transport
>
>
>
> Ray:
>
> Is there somewhere we can see photos of this?
>
> -- NP
>
>
>
> ________________________________
>
> From: Ray Keefer <psubs2001@yahoo.com>
> Reply-To: personal_submersibles@psubs.org
> To: personal_submersibles@psubs.org
> Subject: RE: [PSUBS-MAILIST] Launch Retrieval Transport
> Date: Mon, 6 Nov 2006 12:50:49 -0800 (PST)
> >Hi,
> >
> >The best launch and retrieval method that I saw at the
> >2006 PSUBS Convention was Alec Smyth's telescoping
> >tounge on his trailer.
> >
> >Yes a cable can be used to back a trailer into the
> >water. That is until the trailer hits a bump or rock.
> >With a trailer tounge the tow vehicle can push the
> >trailer further out when gravity fails you.
> >
> >For retrieval, once the trailer is out in the water,
> >either method works well.
> >
> >Regards,
> >Ray
> >
> >
> >
> >
> >
> >--- Nomdae Plume <nomdae@hotmail.com> wrote:
> >
> >
> >---------------------------------
> >
> >Hey Joe:
> >
> >Pat Regan had an interresting solution to the problem:
> >He attached a 50 foot cable to his trailer and was
> >able to keep his van high on the launch ramp while
> >moving his sub into deeper water. You can see this in
> >action at:
> >
>
> >http://www.vulcaniasubmarine.com/TESTING%20THE%20NAUTILUS%20MINISUB.htm
> >
> >The draft on my sub is going to be less than three
> >feet when surfaced, so I'm not too concerned at this
> >point.
> >
> >-- NP
> >
> >
> >
> >---------------------------------
> >From: "Joseph Perkel" <joeperkel@hotmail.com>
> >Reply-To: personal_submersibles@psubs.org
> >To: personal_submersibles@psubs.org
> >Subject: [PSUBS-MAILIST] Launch Retrieval Transport
> >Date: Sat, 04 Nov 2006 15:31:31 +0000
> >
> >I would like to open a discussion for the group to
> >brainstorm a common problem.
> >
> >In discussions with several members recently, the
> >issue of trailer launching a 2 ton deep draft
> >submersible is weighing a bit on my mind. The image of
> >backing the thing in far enough to "get stuck" and
> >still not float free, or worse...launching the vehicle
> >as well, has real potential.
> >
> >One member has mentioned to me recently, that as
> >little as 12" decreased draft, would really make a
> >tremendous difference. Saddle tanks alone, may not be
> >enough to do the job.
> >
> >So...some folks in Hawaii, came up with the LRT
> >barge........
> >
> >http://www.photolib.noaa.gov/nurp/nur07523.htm
> >
> >A rather ingenious. but impractical solution for
> >psubbers as it requires diver support, and fully
> >submersible would require increased complexity.
> >
> >However, it did prompt me to think of these little
> >guys...........
> >
>
> >http://www.springsdock.com/images/springs/SpringsNewPontoonBoat_M.jpg
> >
> >
> >These are available on the used market in various
> >states, but our interest would be the floats, and
> >possibly the deck. But, putting a two ton submersible
> >on this deck would make it unstable, so my thoughts
> >are to...reverse the deck (under slung)... cut flood
> >ports in the bottoms, and attach flotation
> >topside...essentially turning these pontoons into
> >MBT's. Blowing to be accomplished by battery powered
> >centrifugal blowers.
> >
> >This could be potentially used only for launching and
> >retrieval in the calm waters of the ramp area, then
> >reload it onto the trailer and tow the sub
> >conventionally.
> >
> >Here are the problems that I can foresee here, and
> >would like discussion on improvements or otherwise
> >unforeseen circumstances.
> >
> >1) Width limited to 102" for legal towing without
> >permits.
> >
> >2) Width limit may limit usable space between pontoons
> >in the described configuration.
> >
> >3) Road towing stability
> >
> >Sometimes the simplest solutions elude you, so I'd
> >like to see what the group can come up with here.
> >
> >Joe
> >
> >
> >
>
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