"dry dock" in the water???
noo...@noopy.noo
an outdrive requiring the boat to be pulled, which is
often quite the pain in the ass, it seems there should
be some way of putting an enclosure around the
outdrive which is big enough to hold a person, so
it could be pumped out and someone could get in
to work on the drive. Does anyone know of such?
Wayne.B
Never heard of such a thing. Find a neighbor with a boat lift or
rent/borrow a trailer. In exchange for a few dinero you could
probably get a rack storage facility to pull you out with a fork lift
and leave you on an outdoor cradle for a day or two.
Bob
See............. cofferdam or cason
But why bother when ya can just yank the boat out with a sling
put on the beach at high tide.... wait for low tide
put lift bags on the stern bouy the aft end up
there are a few others but anint gonna give up all my secrects.
Duhh, put it on a trailer and take it home................
Bob
hpeer
Check spelling
coffer dam or CASSION
I recently read of a Japanese or Chinese freighter with a holed hull
being fixed in Hawaii by use of a cofferdam. I think the article was in
Professional Mariner. Seems it was going to Cuba and was embargoed from
US ports. Took all kinds of diplomatic shenanigans to get her fixed.
Don't know of anything for a small boat.
Closest thing would be a "collision mat" but that would not allow you
the working space.
Given the buoyancy needed you might be better off to use wreckers floats
or "lift bags" to lift the boats stern.
Quick Google search revealed this
L D'Bonnie
There are displacement issues to deal with that would
probably negate the practicality of such an enclosure.
Why don't you invent a big air bladder. Slide it under
your bout and inflate. Properly designed you could lift
the stern out of the water all the way to lawyer heaven.
LdB
tomdownard
In Alaska we have wooden cradles or beaches that we anchor up at in
high tide.
Low tide, the boat is sitting on the hard.
We put our boots on and spread a tarp under where we are working.
We have everything ready. Parts etc. Cause we have 4 hours to get the
job done.
Then we button it up, wait for high tide, pull the hooks, and sail
away.
Cost to pull the boat....$0
tomdownard
I am a marine engineer that worked on boats in Alaska for decades.
Have you ever worked on a boat, in the water?
Under it, outside it, while it can move?
Not for Girly men.
First, you need all the parts. Make sure you have them ALL.
And extra capscrews and bolts for the ones you drop.
Make sure you know what you have to do, step by step.
And have the proper tools, torque wrenches, etc with you.
I lay in bed the night before rehersing. When I get to the job, I have
done it
in my head 10 times.
A cool tool is the battery powered impact drill. It has an attachment
to do bolts.
In fact, use all battery powered stuff if you can.
No cords to fall in the water.
Richard Casady
<Thomas.Perc...@gmail.com> wrote:
>A cool tool is the battery powered impact drill. It has an attachment
>to do bolts.
>In fact, use all battery powered stuff if you can.
>No cords to fall in the water.
My kid brother was an electrical officer on a carrier, the Oriskany.
One of the electricans who worked for him was killed when the
shorepower cable for the ship fell into the water. 440 volt three
phase.
Casady
Bruce in Bangkok
Google on:
Floating Boat Lift Storage Systems
There are many commercial makes and models.
Bruce-in-Bangkok
(correct email address for reply)
cavelamb himself
What you need is a casement for a tidal driven dry-dock.
Float in, let the tide go out and close the doors.
Something like that?
--
(remove the X to email)
Now just why the HELL do I have to press 1 for English?
John Wayne
Jere Lull
Why make it so complicated and expensive?
Just hoist the darned thing, fix the problem, then splash.
Sheesh! Sounds like a bunch of Mensans around here!
--
Jere Lull
Tanzer 28 #4 out of Tolchester, MD
Xan's pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI trips & tips: http://homepage.mac.com/jerelull/BVI/
cavelamb himself
>>
>> What you need is a casement for a tidal driven dry-dock. Float in, let
>> the tide go out and close the doors.
>>
>> Something like that?
>
>
> Why make it so complicated and expensive?
>
> Just hoist the darned thing, fix the problem, then splash.
>
> Sheesh! Sounds like a bunch of Mensans around here!
>
This IS a form of hauling - but could be a whole bunch cheaper
and less prone to hull damage.
Float in, settle into the slings as the water goes out.
Then close the doors for a dry place to work - until you are done.
Come to think of it, wasn't this technique used in the South Pacific
during WW-II?
Richard
Jere Lull
> Jere Lull wrote:
>
>>>
>>> What you need is a casement for a tidal driven dry-dock. Float in, let
>>> the tide go out and close the doors.
>>>
>>> Something like that?
>>
>>
>> Why make it so complicated and expensive?
>>
>> Just hoist the darned thing, fix the problem, then splash.
>>
>> Sheesh! Sounds like a bunch of Mensans around here!
>>
>
>
> This IS a form of hauling - but could be a whole bunch cheaper and less
> prone to hull damage.
>
> Float in, settle into the slings as the water goes out. Then close the
> doors for a dry place to work - until you are done.
>
> Come to think of it, wasn't this technique used in the South Pacific
> during WW-II?
We're talking CRUISING boats, in the current world, without the benefit
of a military budget. Large tidal differences exist, but are not the
norm in the real world of cruising.
Haul, fix, splash is the current state of the art for most cruising
boats. Technology has marched on in the past 50-60 years. Travel lifts
are now the norm.
(and we have a marine railway and other last-generation technologies
within our normal weekend range. We choose current technology.)
Bruce in Bangkok
>On 2008-03-27 22:48:27 -0400, cavelamb himself <cave...@Xearthlink.net> said:
>
>> Jere Lull wrote:
>>
>>>>
>>>> What you need is a casement for a tidal driven dry-dock. Float in, let
>>>> the tide go out and close the doors.
>>>>
>>>> Something like that?
>>>
>>>
>>> Why make it so complicated and expensive?
>>>
>>> Just hoist the darned thing, fix the problem, then splash.
>>>
>>> Sheesh! Sounds like a bunch of Mensans around here!
>>>
>>
>>
>> This IS a form of hauling - but could be a whole bunch cheaper and less
>> prone to hull damage.
>>
>> Float in, settle into the slings as the water goes out. Then close the
>> doors for a dry place to work - until you are done.
>>
>> Come to think of it, wasn't this technique used in the South Pacific
>> during WW-II?
>
>We're talking CRUISING boats, in the current world, without the benefit
>of a military budget. Large tidal differences exist, but are not the
>norm in the real world of cruising.
>
>Haul, fix, splash is the current state of the art for most cruising
>boats. Technology has marched on in the past 50-60 years. Travel lifts
>are now the norm.
>
>(and we have a marine railway and other last-generation technologies
>within our normal weekend range. We choose current technology.)
Over in the Philippines I saw a floating dry dock made of plywood. It
was essentially a barge with a cradle on it. They sank it in shallow
water, loaded the boat and blew the water out of the pontoons with a
compressor to refloat the thing. Home made rig, but worked.
The tide and sling rig isn't logical and I can't believe ever existed.
If you are working on the boat at low tide just prop it up on the
beach. Heck, they been painting lobster boats that way for a couple of
hundred years, or more. Probably been cleaning those oyster tongers
down your way using the same scheme.
Edgar
"Bruce in Bangkok" <b*paige*125@g*mail.com> wrote in message
news:c7hsu3919u7gj3pgt...@4ax.com...
There is some logical use for such a device if you plan to do some major
work which you might not be able to finish on one low water session.
Bruce in Bangkok
wrote:
Look, if you are going to hang a boat in a sling then(1) you use a
travel lift or crane device and pick it up, or (2) you position the
slings and float the boat into them at high tide and when the tide
goes down you can work on it.
However using method (2) every high tide the boat has sufficient water
around it to float it. so why not just put it on the beach? Lash legs
in place and you have exactly the same situation - at high tide the
water covers everything up to the water line.
The slings also have the disadvantage of being rather costly. Have you
prices 15,000 lb. capacity slings recently? Better yet price 17,000
lb. slings, I want a bit of a safety factor on this project. Another
problem is what are you going to tie the slings to? Have you got a
couple of strategically located trees available? Or are you going to
build something?
Edgar
No, sorry,I did not make my scheme clear.
My idea was for a floating dock supported by air tanks so it could float
with a yacht in it.
Position the empty dock over the beach and flood the tanks so it sinks.
Side supports stick up above water so you can correctly position the yacht
above it.
Next low water the yacht will be sitting on it and you close the valves on
the tanks so the whole issue floats on the next tide and continues to float
the yacht on every tide until the job is finished.
Then you flood the tanks again and the yacht sails away.
You could build a thing like that comparitively cheaply as there is nothing
mechanical on it at all.
Bruce in Bangkok
wrote:
You are talking about fairly significant tides. If, at low water you
have the dock situated on the beach just above the tide line (you need
it above the tide line as you are going to drain all the water out of
the tanks at the next low water) you are going to have a device that
is two or three feet thick, say 3 feet. So, to get sufficient water
over it to load my boat you are going to need in excess of 9 foot
tides, say 10 foot tides.
Next, this is not going to be some little dinky device. You are
talking about a 40 ft. boat with a breadth of, say 12 feet, and a
draft of 6 feet. Your tanks and cradle is going to be a fairly
significant structure and of course you are going to get caught in a
trap. Every time you make it bigger or stronger it becomes heavier and
thus needs larger tanks to float it and that makes it heavier and it
needs to stronger and that takes more tanks that make it
heavier...........
Another point is that a certain number of modern, bolt on keel, boats
won't stand on their keel so you need an even more substantial cradle.
Basically what you are talking about is called a floating dry dock and
is in fairly common use, except that you aren't pumping the tanks so
it will only work in areas with fairly big tides.
I still think it is a bad idea. Redesign it to pump the tanks with an
air compressor (remember to do all this heavy maintenance you are
going to need a generator to furnish electrical power so why not an
air compressor) and make it into a real floating dry dock and it will
be rather more useful.
John C.
dollars. It take 30 minutes for the boat to go from floating to blocked. Its
on dry land the entire time and can be replaced in the water at any time.
Your truck can be a few steps away electric and water is often included. Why
do people always try to reinvent the wheel??
John
"Bruce in Bangkok" <b*paige*125@g*mail.com> wrote in message
news:b9nuu3t13724v14vo...@4ax.com...
Peter Bennett
<b*paige*125@g*mail.com> wrote:
<snippage>
>
>Basically what you are talking about is called a floating dry dock and
>is in fairly common use, except that you aren't pumping the tanks so
>it will only work in areas with fairly big tides.
>
>I still think it is a bad idea. Redesign it to pump the tanks with an
>air compressor (remember to do all this heavy maintenance you are
>going to need a generator to furnish electrical power so why not an
>air compressor) and make it into a real floating dry dock and it will
>be rather more useful.
>
>Bruce-in-Bangkok
>(correct email address for reply)
My yacht club has a variation on the floating drydock concept that we
call a "lifter". The lifter floats are never flooded - instead, a
platform between the floats is raised an lowered using an electric
winch. When lowered, the boat can be driven onto the platform, then
the platform is raised to allow work on the boat.
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
Calif Bill
"John C." <jcas...@optonline.net> wrote in message
news:47ef7eaf$0$25045$607e...@cv.net...
Because lots of places that boats cruise do not have travel lifts, etc.
Drakes Bay here in Northern California is where Sir Francis Drake careened
his ship to repair the bottom. So every 6 hours they dealt with the water
and tides. Unless they built a coffer dam around the boat.
John C.
"Calif Bill" <bmcke...@ix.netcom.com> wrote in message
news:13uvknn...@corp.supernews.com...
>
> "John C." <jcas...@optonline.net> wrote in message
> news:47ef7eaf$0$25045$607e...@cv.net...
>> This crazy...........a three day haul in NY costs a couple of hundred
>> dollars. It take 30 minutes for the boat to go from floating to blocked.
>> Its on dry land the entire time and can be replaced in the water at any
>> time. Your truck can be a few steps away electric and water is often
>> included. Why do people always try to reinvent the wheel??
>>
>> John
> Because lots of places that boats cruise do not have travel lifts, etc.
> Drakes Bay here in Northern California is where Sir Francis Drake careened
> his ship to repair the bottom. So every 6 hours they dealt with the water
> and tides. Unless they built a coffer dam around the boat.
>
The original post reference an in water repair instead of hauling. It is
unlikely that he expects to cruise the coast of California to a secluded bay
with his coffer in tow just in case a repair is needed. And as to Sir
Francis Drake did he have the choice to travel to a marina with a travel
left? He lived from 1540 to 1596 moron. He landed in the bay in 1579
http://en.wikipedia.org/wiki/Drakes_Bay
Calif Bill
You call me a moron? No where did we talk about Drake having a travel lift
available! We talked about in water or beaching a boat to repair it. Drake
did just that. And you do not bring a coffer dam with you, you build it.
With lots of shovel work in 1579.
John C.
statement
"Calif Bill" <bmcke...@ix.netcom.com> wrote in message
news:13v0brg...@corp.supernews.com...
Bellsouth Newsgroups
They are very popular here in Florida... trademark is Hydrohoist... they are
used to keep boats out of the saltwater. They are ugly but can be moved
and resold easier than a permanent lift.
Bruce in Bangkok
It is a common practice to tie boats up against a dock, prop them up
with "legs" or is a cat just sit it down on a couple of logs and do
the work while the tide is out. I have cleaned and anti-fouled a 40
ft. sloop in one tide; seen people install through hull fittings and
do a multitude of other work between tides. A friend of mine got off
course and hit a rock and knocked a hole in his 50 ft. boat. He
plugged the hole with pillows and beached the boat. Epoxied a piece of
plywood over the hole and re-floated on the next tide and left for
India a few days later - a three week out of sight of land voyage.....
As I implied in my original post it is a poor idea.