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[PSUBS-MAILIST] transit/range/towing
David Emile Joe,
The basic problem is that if you want to do something with your sub
that goes beyond tech talk and subber events you need RANGE.
What means you need either a mothership, a tow boat, or a long range
cruising capability.
I also experienced the behavior of not following the tow boat when
pulled with a line in a small boat of 1 ton i built earlier this could
roughly compare with a K-boat.
The solution coupling sub and tow boat parallel and with fenders helps
to make it moveable (some) with a outboard motor. In severe wave
conditions this is highly problematic.
Even the 20ton sub with its streamlined shape was hard to tow for this
(not follow properly on a line) reason - so i experimented a bit on
this problem.
This is the outcome:
Your boat will follow the tug if you put a big vertical plate on its
heck that works like a fin.
The more aft the fin is the more efficient. You also can attach a long
plasic tube firmly to the heck (five meters at least) to create a
similar effect. This will make the nose of your boat follow the force
from the rope.
I recently thought about aluminium batteries as a way to get high
energy density for long range cruising in a small boat.
Keeping in mind how little energy a submerged streamlined boat needs
to move (see economic submarine cruising on my website
(concretesubmarine.com) this could give a K sized boat (streamline
optimized) a couple of miles of range without the need of a combustion
engine, a mothership or a tug.
Anybody a opinion on Aluminium batteries ?
Cheers Wil
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Fecha: Mon, 27 Aug 2007 09:06:08 +0200 [00:06:08 PDT]
De: Emile van Essen <emile@airesearch.nl> Holanda
Para: personal_submersibles@psubs.org
Responder-A: personal_submersibles@psubs.org
Asunto: RE: [PSUBS-MAILIST] transit
Cabeceras: Mostrar todas las cabeceras
David,
Surface transit or towing is far from ideal with "our" type of subs.
Except for Kraka then.
The Nemo team told me that towing Nemo is not working well , even with a
ridid boom instead of a rope. Towing the sgt. Peppers the same.
The sub tend not to follow the tow boat and At higher speeds they dive.
At sea when you have probably waves you might consider to transit
submerged.
Regards, Emile
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Fecha: Mon, 27 Aug 2007 10:59:01 +0000 [03:59:01 PDT]
De: Joseph Perkel <joeperkel@hotmail.com> Estados Unidos
Para: personal_submersibles@psubs.org
Responder-A: personal_submersibles@psubs.org
Asunto: RE: [PSUBS-MAILIST] transit
Cabeceras: Mostrar todas las cabeceras
Emile,
This is a recurring problem as you have noted. Several people with K
boats have reported
much trouble in this regard. The best solution, which is beyond most
psubbers, is to deck
launch via davit or A-frame.
I have given this much thought and, as I am now likely returning to a K boat
configuration, a good potential solution is to lash the boat securely
abeam the tow
vessel to fore and aft bollards, such as this
http://www.frappr.com/?a=viewphoto&id=269116&pid=7500890&myphotos=1
This of course, requires the tow boat to have sufficient "rudder
authority" to be able to
do this. A little tug like this, with a large slow prop and a barn
door rudder, will
likely do the trick. A outboard motor vessel, or cruiser with a spade
rudder, would not.
The tow boat, need not be this fancy. A large prop/ rudder, with
appropriate engine /
reduction gear combination, on a quick ugly hull is all that's required.
Joe
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Van: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens David Bartsch
Verzonden: zondag 26 augustus 2007 23:57
Aan: personal_submersibles@psubs.org
Onderwerp: [PSUBS-MAILIST] transit
I have given some thought as to dive site transit problems. In short, the
actual dive site might contain a sunken ship of interest, or perhaps a
natural object of interest such as a reef containing coral formations.
This dive location could ,and probably will be, some distance from the
location that my sub will enter the body of water. You could tow the vessel
which would require a support vessel and crew, or perhaps as with Peter is
building, a boat with long range high speed surface cruising ability.
I am concidering a slower more enduring transit approach while submerged.
A last minute battery equilize charge and air stock replenishment prior to
final dive and exploration.
How do you deploy your boat for distant dives (Say several miles)?
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