Vance,
With extensions
behind the trailer, you will probably find the moment forces on the hitch VERY
high when you move 2 tons aft of the balance point of the trailer’s
wheels.
If the 2nd
half of my analysis will ever get through to the list (I have sent it twice and
Joe has sent it once), some of the options considered is a pontoon boat and a
semisubmersible planing sea sled. The Sub would sit on the sea sled and
you would launch both, the sled adding additional buoyancy to allow skinny
water launches and then provide a means for delivering the sub to the dive site
in a speedy manner. The SEALs and US Army use similar vessels to move big
loads fast.
R/Jay
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
It is the mark of an educated mind to be able to
entertain a thought without accepting it.
- Aristotle
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of vbra676539@aol.com
Sent: Sunday, November 05, 2006
12:00 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST]
Launch Retrieval Transport
Joe, How about a variant of George's K-350 trailers? Give it a
longer tongue (mine is an aluminum American built for a 24' sailboat). What I'm
thinking about is two inverted channels for the skids under the pods to sit on,
and maybe a second section to fold out behind the trailer during
launch/recovery. It would project deeper into the water behind the trailer and,
in theory at least, be deep enough to line the skid wheels up on and provide a
track to winch it the rest of the way up. I haven't tried this yet, but it
wouldn't cost a hundred bucks to stick something together enough to prove or
disprove the theory. It's a whole lot simpler than anything else I can think of
right this second, and puts the sub into the water without boats, floats or
pontoons.
However, we're still stuck slow towing, and if you've got to cross
Biscayne Bay or clear Lower Matecumbe before
you can dive, then it's worth some attention. Four knots means an hour or two
each way under tow. Ten knots might get you there in an hour and back in the
same. That means you're going to have to build a surface tow body that happens
to have a submersible in it, or something separate to transport the sub on. It
doesn't take long to start thinking about a powered cat of some kind, does
it? But then we've got mooring/dockage to worry about...
-----Original Message-----
From: joeperkel@hotmail.com
To: personal_submersibles@psubs.org
Sent: Sun, 5 Nov 2006 11:13 AM
Subject: RE: [PSUBS-MAILIST] Launch Retrieval Transport
looking at this today since an early trailer decision needs to be
made anyway. Following are a couple of excerpts from the hydrohoist
technical specs......
A single motor control will use:
1252 Watts
10.6 Amps
Max suction = 110.44" water
Max airflow = 103.49 CFM
Clearly, my idea of using batteries, is a dead dog, ....so a 1500w
generator is required.
This problem of S. Florida launching
is giving me heartburn!...would hate to be limited to marina lifts as their
locations may not always be what you need.
From: "Jay K. Jeffries" <bottomgun@mindspring.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: RE: [PSUBS-MAILIST] Launch
Retrieval Transport
Date: Sun, 5 Nov 2006 08:08:49 -0500
The tires can
be filled with water as they often do on forklifts and large front-end loaders.
It is the mark of an educated mind to be able to
entertain a thought without accepting it.
- Aristotle
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Joseph Perkel
Sent: Sunday, November 05, 2006
7:53 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST]
Launch Retrieval Transport
Just conjecture here as I've not worked it out, but I worry about
stability with that, perhaps reversing the cg, and center of buoyancy (bad
news).
Anecdotal evidence (as demonstrated by the nice folks at
"hydrohoist"), suggests the hydrohoist on wheels concept may very
well be viable. The tires, may or may not have to to compensated for.
From: "Carl
Dickinson" <dickinson8@msn.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Launch
Retrieval Transport
Date: Sun, 5 Nov 2006 06:56:53 -0500
What about a inflatable float design, basically an
underbelly or below the waterline bladder?
----- Original Message -----
Sent: Sunday, November
05, 2006 6:12 AM
Subject: Re:
[PSUBS-MAILIST] Launch Retrieval Transport
Did a quick and dirty conceptual sketch of the "dry dock / utility
trailer".
(not to scale),
(Cylinders are MBT's and rectangles are floats.)
http://www.frappr.com/?a=viewphoto&id=269116&pid=3192195
What you have here, is basically a "hydrohoist" on wheels.......
http://www.boatlift.com/
However, not yet solved, are the proper volumes / dimensions of the
components and how it all fits to scale, with wheel height, width, cg and
center of buoyancy all worked out.
As Jay points out, this is unsuitable for towing to sea, and remains only a
potential for "skinny water" launching, but it does have the
advantage of
not having to worry about "clearing" the trailer in any given
distance from
the launch vehicle.
Joe
>From: ShellyDalg@aol.com
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Launch Retrieval Transport
>Date: Sat, 4 Nov 2006 23:06:01 EST
>
>Damn!......I love this group! Keep the ideas flowing. Frank D.
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