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"dry dock" in the water???
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"dry dock" in the water???
On Mar 24, 4:41*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? 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 |
"dry dock" in the water???
Bob wrote:
On Mar 24, 4:41 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? 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 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 http://www.flexitank.com.au/salvageequipment.asp |
"dry dock" in the water???
|
"dry dock" in the water???
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? |
"dry dock" in the water???
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 |
"dry dock" in the water???
On Mar 24, 5:13 pm, L D'Bonnie wrote:
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? 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 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. |
"dry dock" in the water???
On Thu, 27 Mar 2008 12:32:49 -0700 (PDT), tomdownard
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 |
"dry dock" in the water???
On Thu, 27 Mar 2008 12:25:35 -0700 (PDT), 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 Google on: Floating Boat Lift Storage Systems There are many commercial makes and models. Bruce-in-Bangkok (correct email address for reply) |
"dry dock" in the water???
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/ |
"dry dock" in the water???
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? -- (remove the X to email) Now just why the HELL do I have to press 1 for English? John Wayne |
"dry dock" in the water???
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 |
"dry dock" in the water???
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/ |
"dry dock" in the water???
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) |
"dry dock" in the water???
"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. |
"dry dock" in the water???
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) |
"dry dock" in the water???
"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. |
"dry dock" in the water???
On Sun, 30 Mar 2008 10:34:40 +0200, "Edgar"
wrote: "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. 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. Bruce-in-Bangkok (correct email address for reply) |
"dry dock" in the water???
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 "Bruce in Bangkok" wrote in message ... On Sun, 30 Mar 2008 10:34:40 +0200, "Edgar" wrote: "Bruce in Bangkok" wrote in message . .. On Sat, 29 Mar 2008 17:06:05 +0100, "Edgar" wrote: "Bruce in Bangkok" wrote in message m... 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. 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. Bruce-in-Bangkok (correct email address for reply) |
"dry dock" in the water???
On Sun, 30 Mar 2008 16:55:10 +0700, Bruce in Bangkok
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 |
"dry dock" in the water???
"John C." wrote in message ... 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 "Bruce in Bangkok" wrote in message ... On Sun, 30 Mar 2008 10:34:40 +0200, "Edgar" wrote: "Bruce in Bangkok" wrote in message ... On Sat, 29 Mar 2008 17:06:05 +0100, "Edgar" wrote: "Bruce in Bangkok" wrote in message om... 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. 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. Bruce-in-Bangkok (correct email address for reply) 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. |
"dry dock" in the water???
"Calif Bill" wrote in message ... "John C." wrote in message ... 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 |
Apology!!
Sorry moron was left over from "marooned", was not intended as a derogatory
statement "Calif Bill" wrote in message ... "John C." wrote in message ... "Calif Bill" wrote in message ... "John C." wrote in message ... 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 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. |
"dry dock" in the water???
"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. |
"dry dock" in the water???
"John C." wrote in message ... "Calif Bill" wrote in message ... "John C." wrote in message ... 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 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. |
"dry dock" in the water???
On Sun, 30 Mar 2008 10:50:55 -0800, "Calif Bill"
wrote: "John C." wrote in message ... 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 "Bruce in Bangkok" wrote in message ... On Sun, 30 Mar 2008 10:34:40 +0200, "Edgar" wrote: "Bruce in Bangkok" wrote in message m... On Sat, 29 Mar 2008 17:06:05 +0100, "Edgar" wrote: "Bruce in Bangkok" wrote in message news:c7hsu3919u7gj3pgtambeai7b20dfsj4o5@4ax. com... 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. 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. Bruce-in-Bangkok (correct email address for reply) 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. 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. Bruce-in-Bangkok (correct email address for reply) |
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