সোমবার, ২ ফেব্রুয়ারী, ২০১৫
Sport Fishing Boat Plans
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রবিবার, ১ ফেব্রুয়ারী, ২০১৫
Design 1834 Intrepid
One description has been repeatedly used to describe the 12-meter racing yacht Intrepid: a breakthrough yacht. Built to the Third International Rule, Intrepid (US22) was constructed of wood by the Minneford Yacht Yard of City Island and launched in 1967. She successfully defended the America"s Cup in both 1967 and 1970.
Her extensive tank test program at the Davidson Laboratory at the Stevens Institute in Hoboken, New Jersey, included eight models, 35 modifications and 18-months of work. Heres a rather poor quality image of Olin at the towing tank at the time.
Intrepid was the first 12-meter to use a separate keel (with trim tab) and rudder successfully. Her knuckle bow was an innovation as was the placement of much of her deck gear (and crew) below decks, allowing the boom to be lowered dramatically, and thus also lowering her center of gravity. This included her coffee grinder winches. Heres a diagram from a 1967 Time magazine article which demonstrates this arrangement well.
Here is a nice image - her chief designer contemplating what is to come as she exits the building shed.
And the moment of her launch.
Here are the plans. I apologize for the poor quality of the deck plan. I will try to find a better copy when I am back in the office on Monday.
Principal Dimensions
LOA 64-0"
LWL 48-0"
Beam 12-3"
Draft 9-0"
Displacement 60,000 lbs
Ballast 39,000 lbs
Sail Area 1,756 sq ft
She is currently on the used boat market. Information and additional images can be found by clicking here. More information can also be found on our website by clicking here.
Mystery of the Blue Moon
For my entire 2000 mile cruise around Florida and up the east coast of the US, I was never satisfied with the way the Blue Moons sails were rigged. The staysail, for instance, didnt self-tack without adjustment. The mainsheet was awkward to use. And the mizzen was downright dangerous!
Being new to gaffers and wooden boats, I blamed myself. I figured I just didnt know how to use the gear properly. But gradually I began to suspect the problem went deeper than that.
And now Im convinced the Blue Moon was rigged all wrong!
For example, lets just look at the worst offender: the mizzen. Referring to the drawing above, the mizzen is the left-most sail -- the one hanging 8 off the Blue Moons stern.
It looks pretty small, right? Just one of the cute little sails that give the Blue Moon its character.
The sail itself is 50 square feet, about the same size as Vintages mainsail. The mast is about 14 tall, the boom 8 long, and the yard 11.
This type of sail is called a standing lug sail, which has a reputation for being powerful and easy to use.
So whats the problem? Check out the mizzen spars, which I have taken off the boat for painting.
Notice anything odd? There are virtually no fittings on these spars, except for a couple of small, plastic blocks that have obviously been added fairly recently. There is a 1.5" cheek block at the top of the mast, and a turning block hanging from the boom (not visible in photo.)
Otherwise, the only fittings are the shoulders at the top of the mast, and holes drilled at each end of the boom and yard.
I believe the Blue Moon was built by a builder named Randy Hill down in NC. Ive never met Mr. Hill, though I would love to. I havent been able to track him down, so far. But Mr. Hill knew a thing or two about wooden boats. He knew how to build them strong, and he knew how to rig them simply, without a lot of shiny geegaws screwed into the spars.
But somehow his knowledge was not passed down through all the Blue Moons owners.
Someone, at some point, looked at this set of mizzen spars and asked, "How the heck do you hoist up the sail?" and "Where does the dangburn sheet go???"
Lets look at the halyard first. The halyard is the rope used to pull the sail to the top of the mast. To do this, the halyard is led from the cockpit, up through some sort of block at the top of the mast, and down to the top of the sail, where it is tied off. To hoist, you just pull on the loose end of the halyard.
But how was this done before the plastic cheek block was installed?
A mystery.
Next, lets look at the mizzen sheet. You can see from the diagram above that the Blue Moons mizzen sheet is a simple affair. Just a rope attached to the end of the boom, led through a turning block on the boomkin, back up through another turning block on the boom, and into the cockpit. Could not be simpler.
But again, there is no hardware on the boom. No place to tie off the sheet. No turning block. How was the sheet set up before someone screwed a tiny plastic turning block into the boom?
Another mystery.
What is my problem with these small plastic blocks? Simply put, they are unsafe. The two 1.5" screws holding the cheekblock to the top of the mast pulled out in a fairly light wind. Thats how much power this small sail can generate.
And thank King Neptune that they pulled out when they did. Even in a light breeze, it was a heck of a job to pull the yard, sail, and boom, plus a bunch of tangled rope, out of the water and back into the cockpit. Id hate to think what would have happened if it pulled out on a dark night, offshore.
I screwed the cheekblock back into the mast after the first disaster, but never had the nerve to try it again.
There are other problems. Suppose the halyard was set up more securely. What happens when you let the sail down?
Think about it. The only thing holding up the yard, sail, and boom is the halyard. When you slack off on the halyard, the boom drops down onto the boomkin, the sail comes down behind it and starts to drag in the water. Finally the 11 yard comes down, swinging around, uncontrolled, threatening to drag the sail, you, and whoever happens to be hanging onto your feet, down to Davy Jones locker.
Supposing you dont get dragged overboard, how do you get sail ties around all that stuff when its hanging off the back of the boat, out of reach?
Another mystery.
I have some clues: four small holes drilled into the bottom of the boom, and two small footprints in the paint.
What were these holes for? I believe there were two pad eyes attached to the bottom of the boom, roughly dividing the boom into thirds.
My first thought was that they were for attaching the end of the sheet and the turning block, but they are in the wrong place for that. The plans show the end of the sheet tied off to the end of the boom, with the turning block close to the middle. But these pad eyes were installed 1/3rd of the distance from either end.
More importantly, I cant see the conservative Mr. Hill depending on four short screws to control all the force generated by the mizzen sail. If he did attach the mizzen sheet to the boom with pad eyes, they would also tend to pull out just when you needed them most. Not the kind of strong and simple construction that he seemed to favor.
So what were those pad eyes for? And how did he hoist and sheet the mizzen without any hardware?
Thats what puzzled me and at least one other Blue Moon owner. But I think Ive finally solved the mystery...
To be continued
>>> Next Episode: Mystery solved!
Read More..
 |
| Blue Moon Sails, from left to right: mizzen, main, staysail, jib topsail above the main drawing Tom Gilmer |
And now Im convinced the Blue Moon was rigged all wrong!
For example, lets just look at the worst offender: the mizzen. Referring to the drawing above, the mizzen is the left-most sail -- the one hanging 8 off the Blue Moons stern.
It looks pretty small, right? Just one of the cute little sails that give the Blue Moon its character.
The sail itself is 50 square feet, about the same size as Vintages mainsail. The mast is about 14 tall, the boom 8 long, and the yard 11.
This type of sail is called a standing lug sail, which has a reputation for being powerful and easy to use.
So whats the problem? Check out the mizzen spars, which I have taken off the boat for painting.
 |
| Mizzen spars From right to left: Mast (14), Boom (8), Yard (11) photo jalmberg |
Otherwise, the only fittings are the shoulders at the top of the mast, and holes drilled at each end of the boom and yard.
I believe the Blue Moon was built by a builder named Randy Hill down in NC. Ive never met Mr. Hill, though I would love to. I havent been able to track him down, so far. But Mr. Hill knew a thing or two about wooden boats. He knew how to build them strong, and he knew how to rig them simply, without a lot of shiny geegaws screwed into the spars.
But somehow his knowledge was not passed down through all the Blue Moons owners.
 |
| Blue Moons Mizzen - click for closer look drawing Tom Gilmer |
Lets look at the halyard first. The halyard is the rope used to pull the sail to the top of the mast. To do this, the halyard is led from the cockpit, up through some sort of block at the top of the mast, and down to the top of the sail, where it is tied off. To hoist, you just pull on the loose end of the halyard.
But how was this done before the plastic cheek block was installed?
A mystery.
Next, lets look at the mizzen sheet. You can see from the diagram above that the Blue Moons mizzen sheet is a simple affair. Just a rope attached to the end of the boom, led through a turning block on the boomkin, back up through another turning block on the boom, and into the cockpit. Could not be simpler.
But again, there is no hardware on the boom. No place to tie off the sheet. No turning block. How was the sheet set up before someone screwed a tiny plastic turning block into the boom?
Another mystery.
What is my problem with these small plastic blocks? Simply put, they are unsafe. The two 1.5" screws holding the cheekblock to the top of the mast pulled out in a fairly light wind. Thats how much power this small sail can generate.
And thank King Neptune that they pulled out when they did. Even in a light breeze, it was a heck of a job to pull the yard, sail, and boom, plus a bunch of tangled rope, out of the water and back into the cockpit. Id hate to think what would have happened if it pulled out on a dark night, offshore.
I screwed the cheekblock back into the mast after the first disaster, but never had the nerve to try it again.
There are other problems. Suppose the halyard was set up more securely. What happens when you let the sail down?
Think about it. The only thing holding up the yard, sail, and boom is the halyard. When you slack off on the halyard, the boom drops down onto the boomkin, the sail comes down behind it and starts to drag in the water. Finally the 11 yard comes down, swinging around, uncontrolled, threatening to drag the sail, you, and whoever happens to be hanging onto your feet, down to Davy Jones locker.
Supposing you dont get dragged overboard, how do you get sail ties around all that stuff when its hanging off the back of the boat, out of reach?
Another mystery.
I have some clues: four small holes drilled into the bottom of the boom, and two small footprints in the paint.
 |
| Mystery holes drilled into the bottom of the boom photo jalmberg |
 | |
| Pad eyes photo Jamestown Distributors |
 |
| Mizzen boom setup diagram jalmberg |
So what were those pad eyes for? And how did he hoist and sheet the mizzen without any hardware?
Thats what puzzled me and at least one other Blue Moon owner. But I think Ive finally solved the mystery...
To be continued
>>> Next Episode: Mystery solved!
 |
| Helena standing at the bottom of an inlet in Cornwall. The ocean comes back and floats the boats half-hidden behind her. photo jalmberg |
Planking a Dhow with Sewn Fastenings
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| The boom Sohar under main and mizzen. She also flew a jib. (Click any photo to enlarge.) All photos are from The Sinbad Voyage except where noted. |
In 1980, Tim Severin built and launched the dhow Sohar, a twin-masted boom of sewn-plank construction. Although he referred to the expedition for which Sohar had been built as The Sinbad Voyage
, in honor of that legendary -- and probably fictional -- Arab sailor, Severins objective was to complete a historically accurate voyage of reenactment on the well-documented trade route from the Middle East to China followed by Arab merchants in the 8th through 10th centuries. (Ive written previously about some of Severins other voyages of reenactment: The Brendan Voyage; The China Voyage; and The Jason Voyage.)
Dhow is an imprecise term used only by Westerners for Indian Ocean vessels of traditional, mainly Arab or Indian, design. Arabs and Indians never use the term, but refer to a variety of specific craft, distinguished by hull shape and rig, by different terms. Before large commercial sailing dhows essentially disappeared around the end of the 20th century, the boom was one of the more popular types. Booms are distinguished mainly by their long, perfectly straight stem that rakes far forward. They are ketch-rigged, in the sense that they have two masts, the mizzen being ahead of the rudder post. But both masts hoist settee sails, unlike any Western ketch. (See a discussion of the settee sail.)
, in honor of that legendary -- and probably fictional -- Arab sailor, Severins objective was to complete a historically accurate voyage of reenactment on the well-documented trade route from the Middle East to China followed by Arab merchants in the 8th through 10th centuries. (Ive written previously about some of Severins other voyages of reenactment: The Brendan Voyage; The China Voyage; and The Jason Voyage.)Dhow is an imprecise term used only by Westerners for Indian Ocean vessels of traditional, mainly Arab or Indian, design. Arabs and Indians never use the term, but refer to a variety of specific craft, distinguished by hull shape and rig, by different terms. Before large commercial sailing dhows essentially disappeared around the end of the 20th century, the boom was one of the more popular types. Booms are distinguished mainly by their long, perfectly straight stem that rakes far forward. They are ketch-rigged, in the sense that they have two masts, the mizzen being ahead of the rudder post. But both masts hoist settee sails, unlike any Western ketch. (See a discussion of the settee sail.)
 |
| Sohar careened to reapply antifouling. This shot gives a good sense of her underwater shape, and the plank stitches can be plainly seen. |
Whether booms existed in the 8th-10th centuries is not certain (the evidence Severin cites is not convincing), but Arab long-distance trading vessels of that period were certainly built shell-first and without forms or pre-set frames, with their planks stitched together. (Heres a view of a 9th century Arab dhow based on more recent research.)
Sohar was 80 feet LOA, 63 feet LWL, 20 feet in beam, and 6 feet in draught. The backbone -- the timbers for which were all single, full-length pieces -- consisted of a 52-foot keel, 12"x15" in section, a 363" stem, and an 18 sternpost. Ill allow Severin to describe the planking:
Each strake was 8-12 inches broad, and between 2 1/4 and 3 inches thick depending on its position. No stealers were used. The strakes were normally divided into four or five sections, between 5 and 15 feet long, butted end to end with tongue and groove joints. The edge-to-edge surfaces between the strakes were flat; that is, there was no step or groove, though every 18 inches or so a locator dowel was used. The entire form was held together with coir stitching, done with four-strand cord. Stitch holes were approximately 4 inches apart, and placed 2 inches from the edges of the strakes.As is typical in traditional forms of shell-first construction, the planks were cut to the needed shape without patterns or spiling: the builders simply know what shape to cut and how it will lie when bent and twisted into position. Planks were gotten out and fined up with soft iron chisels. Getting the mating surfaces to lie flush against one another to the required accuracy of 1/64" inch necessitated several trial fittings for every plank. Severin does not say whether the thick planks were steamed or fire-bent, but it was evidently hard and time-consuming work getting them into place.
No caulking in the regular sense was used. Instead, long narrow bundles of coir (coconut husk) fiber, which the builders called pythons, were placed along the interior seams, and the plank stitching wrapped around them, compressing them against the seams and holding them in place. To quote Severin on the installation of the first garboard section:
 |
| Lashing the first garboard plank to the keel. The worker at the bottom is using a short pole as a lever to tighten the lashing. The "python" can be seen at the left, just inboard of the plank. |
When Kasmikoya, the senior ropeworker, was ready, he divided his men into pairs, an inside man and an outside man. Each pair worked at passing a strand of the finest-quality coir cord out through a hole in the plank, back through the opposite hole in the keel, round the python and out again. There the outside man took a turn of the cord around his lever of stout wood, put his feet against the hull, leaned back, and hauled the string as tight as he could. On the inside, his partner tapped on the string to help it tighten.... Three times, stitch and overstitch, they lashed together plank, keel and python until finally the last stitches were plugged with little tufts of raw coconut fiber.
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| The complete garboard, installed; the next plank clamped in place and ready for stitching to begin. |
The exterior, below the waterline, was coated with antifouling made from lime mixed with mutton fat. Even in the teredo-infested Indian Ocean, this was entirely effective.
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| Applying lime-and-fat antifouling by hand. (The vessel shown is not Sohar.) One can only imagine what this does to your skin. |
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| Oiling the interior. Note how the lashings are neatly set into the frames, and how the frames are also notched over the pythons, which run lengthwise over the plank seams. The floors and partial frames are not fastened to one another -- indeed, they do not even touch. |
 |
| Compare the unfinished frames in this working dhow to Sohars nicely-gotten-out frames and floors in the previous photo. (Source: The Dhow: An Illustrated History of the Dhow and its World by Clifford W. Hawkins) |
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Excellent Suggestions On Picking A Pontoon Boat
With regards to purchasing for pontoon boats you will find several items you should contemplate. The following pontoon boat suggestions will help you to think about the numerous aspects involved in purchasing a pontoon boat in order that youll be able to get the ideal match for your fishing wants. The very first thing to consider is if you want an inflatable pontoon boat or a solid pontoon boat.
Inflatable Vs. Strong
Each the inflatable and strong pontoon boats have their benefits and disadvantages; it all depends upon how you strategy to use the pontoon boat. The largest benefit to an inflatable pontoon boat is their portability. Following deflating the air bladders it is possible to match them in most trucks. Considering that they may be inflatable they are able to also be lighter to carry into remote lakes and ponds.
The inflatable pontoon bladders may not be strong, however they are nevertheless extremely robust. They could hold up against encounters with rocks and logs without having puncturing easily. Even though a puncture happens, inflatable air bladders are easy to patch. Nonetheless, inflatable pontoon boats are more challenging to setup and take down. It might take about five to ten minutes to set up depending on the type of pump you use.
On the other hand, solid pontoons are produced from forms of challenging plastic. They by no means have to be inflated and are equivalent to catamaran sailboats. They are more tough than the inflatable models and practically absolutely nothing can puncture them. Even so, they are a lot more tough to transport - often requiring the bed of a truck a minimum of. They are less complicated to set up because you do not have to do any inflating. You only have to attach the frame towards the pontoons and also you are prepared to go.
Picking A Size
Subsequent you have to contemplate the size in the pontoon boat you will need for fishing. You can find quantity of sizes in relation to pontoon boats. Each size may have its own advantages according to how you plan to utilize it. In case you plan on carrying a lot more supplies then you will need a larger pontoon boat as a result of its improved weight capacity. Nevertheless, you must by no means overload a pontoon boat. It is not easy to tip a pontoon boat, but it will occur should you exceed the weight capacity.
You also wish to think about how you are going to make use of the boat. Should you strategy on making use of it to get a extended river trip or spending several days around the lake then a larger boat will provide you more room for all of your gear. In the event you program on traveling farther distance to a remote place then a smaller pontoon boat is less complicated to carry.
Lastly you ought to think about how a lot of people are going to be with you. In case you are going fishing by yourself then a tiny pontoon boat could be all youll need. But if you will find instances that a pal or family member is going to go with you then you definitely might desire to consider a medium to larger model depending on how a lot of individuals will travel with you. Choosing the best pontoon boat implies you need to cautiously take into account how it will be used.
With regards to purchasing for pontoon boats you will find several items you should contemplate. The following pontoon boat suggestions will help you to think about the numerous aspects involved in purchasing a pontoon boat in order that youll be able to get the ideal match for your fishing wants. The very first thing to consider is if you want an inflatable pontoon boat or a solid pontoon boat.
Inflatable Vs. Strong
Each the inflatable and strong pontoon boats have their benefits and disadvantages; it all depends upon how you strategy to use the pontoon boat. The largest benefit to an inflatable pontoon boat is their portability. Following deflating the air bladders it is possible to match them in most trucks. Considering that they may be inflatable they are able to also be lighter to carry into remote lakes and ponds.
The inflatable pontoon bladders may not be strong, however they are nevertheless extremely robust. They could hold up against encounters with rocks and logs without having puncturing easily. Even though a puncture happens, inflatable air bladders are easy to patch. Nonetheless, inflatable pontoon boats are more challenging to setup and take down. It might take about five to ten minutes to set up depending on the type of pump you use.
On the other hand, solid pontoons are produced from forms of challenging plastic. They by no means have to be inflated and are equivalent to catamaran sailboats. They are more tough than the inflatable models and practically absolutely nothing can puncture them. Even so, they are a lot more tough to transport - often requiring the bed of a truck a minimum of. They are less complicated to set up because you do not have to do any inflating. You only have to attach the frame towards the pontoons and also you are prepared to go.
Picking A Size
Subsequent you have to contemplate the size in the pontoon boat you will need for fishing. You can find quantity of sizes in relation to pontoon boats. Each size may have its own advantages according to how you plan to utilize it. In case you plan on carrying a lot more supplies then you will need a larger pontoon boat as a result of its improved weight capacity. Nevertheless, you must by no means overload a pontoon boat. It is not easy to tip a pontoon boat, but it will occur should you exceed the weight capacity.
You also wish to think about how you are going to make use of the boat. Should you strategy on making use of it to get a extended river trip or spending several days around the lake then a larger boat will provide you more room for all of your gear. In the event you program on traveling farther distance to a remote place then a smaller pontoon boat is less complicated to carry.
Lastly you ought to think about how a lot of people are going to be with you. In case you are going fishing by yourself then a tiny pontoon boat could be all youll need. But if you will find instances that a pal or family member is going to go with you then you definitely might desire to consider a medium to larger model depending on how a lot of individuals will travel with you. Choosing the best pontoon boat implies you need to cautiously take into account how it will be used.
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