On 2008-03-27 22:16:30 -0400, cavelamb himself said:

tomdownard wrote:
On Mar 24, 5:41 pm, wrote:

Since often (too often) boats develop problems with 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?

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

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!

--
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/

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?


Richard

--
(remove the X to email)

Now just why the HELL do I have to press 1 for English?
John Wayne

On 2008-03-27 22:48:27 -0400, cavelamb himself 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.)

--
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/

On Sat, 29 Mar 2008 01:12:17 GMT, Jere Lull wrote:

On 2008-03-27 22:48:27 -0400, cavelamb himself 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.


Bruce-in-Bangkok
(correct email address for reply)

"Bruce in Bangkok" wrote in message
...
On Sat, 29 Mar 2008 01:12:17 GMT, Jere Lull wrote:
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.

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.

On Sat, 29 Mar 2008 17:06:05 +0100, "Edgar"
wrote:


"Bruce in Bangkok" wrote in message
.. .
On Sat, 29 Mar 2008 01:12:17 GMT, Jere Lull wrote:
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.

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.


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?

Bruce-in-Bangkok
(correct email address for reply)

"Bruce in Bangkok" wrote in message
...
On Sat, 29 Mar 2008 17:06:05 +0100, "Edgar"
wrote:


"Bruce in Bangkok" wrote in message
. ..
On Sat, 29 Mar 2008 01:12:17 GMT, Jere Lull wrote:
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.

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.


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?

Bruce-in-Bangkok
(correct email address for reply)

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 in message
...
On Sat, 29 Mar 2008 01:12:17 GMT, Jere Lull wrote:

On 2008-03-27 22:48:27 -0400, cavelamb himself
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.


Bruce-in-Bangkok
(correct email address for reply)

They are very popular here in Florida... trademark is Hydrohoist... they are
used to keep boats out of the sal****er. They are ugly but can be moved
and resold easier than a permanent lift.