Build iom yacht

For anyone interested in sailmaking, I've just finished editing Larry Robinson's "Making Model Yacht Sails" part 1 only booklet and have published it as an "international" edition. I've done this, not to get rich 'cos this isn't going to happen to either me or Larry or anyone else connected with this enterprise! Larry wrote a second "Part 2" booklet mainly dealing with "string" sails, and has kindly agreed to providing it as a free download from Sail making part 2.

From my understanding of sail making, there are two ideas I want to contradict. The first idea is that you can make sails by accurately cutting a curve on a panel, and then attaching it stitching, gluing to another panel.

Well, while you might be able to cut a good curve some of the time, your fingers just don't have laser accuracy in them to stick A to B and you'll hardly ever obtain reproducible or reliable results.

It might be possible to butt-join the curved edge to another curved edge with a little more reliability, but this doesn't yield what the Equipment Rules of Sailing define to be a seam. Such a sail couldn't be used in sanctioned IOM competition, though it would be OK in a development class.

The second idea is that you can drape your panels over a "camber board" and get a nice shape that way. Well, let me be clear about what I'm knocking here. I take a "camber board" to be a length of curved surface, where the curve is like the surface of a cylinder. In this case, your panelled sail will have exactly the same shape as a single un-panelled sail and, if you wanted a three-dimensional shape, you've wasted your time though the result certainly looks the part.

Larry's booklet is the only source I know which carefully explains the use and construction of a sail block. I am sure that this is really the only way in your garage, please, not in some specialist workshop!

Warning: Y'all should know I have ten thumbs and have never made a sail yet. What I have done carefully is to watch and talk to those who do, both professionally and as home builders, and measure the results.

Making Larry's booklet available internationally is my way of telling you what I've learned.

build iom yacht

Bob Wells' e-mail is "bob" at "islandinet. I've attempted an analysis of how blocks work on a new page, Sail blocks analysisand have a new spreadsheet there to help.I was happy with the construction of my first hull, and used the same building jig. This time I made one wide plank from the gunwhale down to the chine with one wide piece of cedar. I made a thin plywood pattern off the building jig, and cut out a piece of cedar to this pattern, fitted and glued my mahogany sheer plank with a cedar plank above it, all on my workbench.

I was pretty fussy in selecting the cedar, it had to be quarter cut which shows the tight grain lines, and I prefer a lighter rather than a darker cedar.

I thought this method was easier than planking this area of the hull with individual planks as the area is flat, and if you pick good looking timber, the end result looks great. For the rest of the hull I used 8 mm x 2. For the centreline plank on the bottom I used a plank of New Zealand macrocarpa, which is harder than the cedar as this plank takes a bit more stress with the keel and rudder post rebated though it.

I do not put pins through the planking as the holes show up in the finished article. Once the planking was completed I sanded the hull fair taking care to only sand with the grain, as any scratches from sandpaper across the grain will show up in the varnish finish. Next step was to fibreglass the outside with 50 gram cloth in WEST resin.

I then gave the hull a second coat of resin to ensure a good covering over the glass cloth. Taking the hull off the building jig, I turned it over and sanded the inside to remove all excess glue, then I fibreglassed the inside.

This time I glassed the inside using two pieces of 50 gram cloth, port and starboard and overlapped the glass cloth in the keel area. This was easier to handle compared to my first V8 where I tried to glass the inside with one piece of cloth and had some difficulty.

I laid up extra layers of cloth in the vicinity of the keel box and rudder stock area. The hull weighed grams at this stage fibreglassed inside and out, probably grams more than a fibreglass hull. For this V8 I decided to use a V8 fibreglass aft deck which has the upstand for the hatch lid, and the well for the mast and vang to sit in.

I also bought the fibreglass keel box, mast box, winch tray, and bulkhead for the chain plates to attach to. I set the yacht up vertically and epoxy glued all these interior fittings in place, and fitted the aft deck. My tube is 8 mm outside diameter and so has a wall thickness of 2 mm.

I made a fibreglass channel section and glued it in place across the boat and then set the rudder tube up through it. For the chain plates I laid up a block of fibreglass about 8 mm square x 40 mm long and glued it onto the hull and the bulkhead to transfer the loads down to the keel box. I then drilled an oversize 4mm hole in the blocks to the depth of my chain plate eyebolts which are 3 mm diameter. Once the deck was fastened to the hull I filled the holes with resin, letting it soak in completely for about 10 minutes then glued the eyebolts into the oversize holes.

The idea of the oversize holes is that there is more surface area and therefore more holding power for the epoxy glue around the chain plate bolts.

Category: IOM Building

For the backstay chainplate I glued a piece of 8 mm square cedar inside the transom and drilled a 4 mm hole down the center and after the deck was glued down I inserted the backstay eyebolt into the hole which was saturated with resin.

I doubled up the gunwhale in this area and lifted the inside piece higher than the actual sheer line so I could fair the foredeck to it. I made a kingplank from 8 mm x 4mm cedar, doubled it up at the aft end to take my tube for the mast ram, and doubled it up for the 3 jib boom positions forward, then made some fibreglass deck beams about 1. I made a 1. At this stage I also glued 3 nuts under the kingplank so I could screw my jib boom eyebolts into them once the foredeck was on. I made a template of these positions with the stem as a reference point so when the foredeck was on I could lay the template on the deck and drill through to locate the nuts.

This is a fibreglass moulding so I rebated the gunwhales and glued it down into the rebate so the deck was flush with the cedar gunwhale, I then laid a strip of 50 gram fibreglass around the gunwhale to seal and protect it. Great care was taken to glue the mast well part of the aft deck to the top of the centercase and mast box to ensure there are no leaks up the keel slot. I then sealed the underside of the.The starting point for a really good rig is ensuring that you set up the mast to match the sails as far as possible.

To halp you achieve this, there are some general guidelines on this page. Most boat builders supply a rigging guide with their hulls, and it is worth getting your hands on the guide for your particular boat.

Prior to commencing the rig building process, make sure you have a plan to follow. Why put pre-bend into an IOM mast? The purpose of using pre-bend is to increase the amount of forestay pressure that can be generated.

Without pre-bend, the end result will be a forestay which sags. The amount of pre-bend and the distance over which it is placed, depends on the luff curve of the mainsail. It is not dependant on the design of boat — often one hears skippers talking about the amount of pre-bend for a particular hull design, but this is not the defining factor.

When ordering sails, you should ask you sailmaker how much pre-bend they recommend for the luff curve of their mainsails. To achieve this, the following factors all need to be right:. The type of mast — diameter, style groovy or round and material. Some typical examples can be found in the rigging guides for the various hull designs — although these assume you are using sails from the hull builder.

Most recommend using Most new masts will not be perfectly straight.

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Find the existing curve in the mast and use that to assist you to achieve your desired pre-bend. Pre-bend around a curve of mm radius works pretty well. You will need to go slowly at first, as some masts bend easily, and only require one or two bends around the jig, whereas others may take quite a few. The top mm of the mast does not bend uniformly, so it is worth chopping that amount off after the bending is complete. It is wise to pre-bend the mast prior to drilling any holes.

Make sure that the mast remains in exactly the same orientation each time you bend it around the curve, otherwise the result will look really wobbly! If you can get your hands on one of these drilling blocks, they are worth their weight in gold! The block on the end of the mast holds the mast in the same orientation all the time and allows for the mast to be rotated through 90 degrees or degrees. The drilling block ensures that the hole will finish up in the centre of the mast every time!

Follow your rigging plan to place the holes in the position you want. As a general guide, shroud height higher up the mast will provide better sideways control of the mast, but allow for less forestay tension. Conversely, lower shroud positions will allow you to generate better forestay tension at the expense of sideways bend. Run your shrouds through the hole, and pull them out the top of the mast. Run both shrouds through a plastic ball, and crimp them off. Once that's done, pull the shrouds back down, so that the plastic ball sits up against the front edge of the mast.

This will spread the load of the shrouds over a larger area. The mast plug can be adjusted so the small metal arm which the top of the sail is tied to, rotates really easily. Sharpen the bottom of the wire arm which swivels, so that it is a point.

When the wire arm rests on the screw, it will rotate easily. The method is shown in the Obsession rigging guide from Craig Smith. The mast crane should be long enough so that the backstay only just clears the leech of the sail. If the crane is too long, it will put too much mast bend into the top of the mast when you pull on backstay tension.

A shorter "lever" is better.I will say these are early days, but we have been very much encouraged by this new design direction.

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Hence we decided to build a series of Banana based yachts across several classes. As explained elsewhere, it is a rather unique approach to the downwind performance of yachts.

The hull should drive in a straighter line when forced down in a gust and spend less time with the deck under the water. Plus there have been some changes in terms of the efficiency of water flow across the first third of the hull, the crucial connection zone. We already know these changes work on smaller hulls RG and Footy now the question is, can it be expanded to the larger hull? We think it can. The major advantage of using 3d printing technology is the speed at which a new design can be printed and constructed.

This one took 24 hours of printing time. This includes coating the inside with alcohol metho diluted epoxy. Drain excess epoxy, then allow overnight to cure. Cover the centre line regions with a good quality masking tape. Establish the centre line top and bottom as accurately as possible, I use a laser to help in this area, but that is an optional luxury. Trace the openings to be cut on the masking tape. Now for a lesson in cutting, I have made more mistakes than anyone so this is worth considering:.

Finally, after trialing many different surface preparations we have found it is easier and far more effective to leave the hull surface raw as it comes from the printer.

The hull is tough, resilient, and UV resistant to fading. The colours are in the printed PLA and therefore nothing needs to be done to the surface. Construction is fairly straight forward. The rest is making sure everything lines up and you prepare the surfaces with some fine sandpaper before epoxy gluing. In my designs everything that possibly can be is made by 3d printing. This image shows the hull partly prepared and all the parts to be installed. It may take you some time to get a keel case designed and nicely fitting.

But it is worth the effort. It can be reprinted over and over again for new models. The struts are there to add extra compressional strength between the hull and the base of the keel case. Whatever you design will be fine as long as they are strong and lightweight.

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I keep them simple with a support strut down the middle for rigidity and turn the 4mm shaft at the end to stop twisting as time goes on. These can be seen faintly through the surface material. Notice the rudder shaft projects up into the support cylinder which will be set under the deck. Lets face it even the best boats leak sometimes, others needed draining after every race.

I got thinking, after a design session with Craig Smith where we designed in a waterproof winch system to be printed with the hull, so I thought about the idea of water sealing the winch, servo and receiver in their own containers. Spares can be pre-attached to their own spare lids ready to change in a jiffy if necessary.This site is primarily intended to help those building a one off IOM International One Metre or a similar radio controlled model yacht.

Where you are intending to build a few similar boats, for example a group of you want to build the same design, a female mould of some form should be made. This is not dealt with here. I spent over a year deciding on what design to build, and was lucky to be lent a one off designed IOM which helped me get to know the class. As this was my first go at such a project, I also decided to try out techniques and make my mistakes hopefully on another build first, so I made one to my own design, a design that I had done drawn up before I got the Vickers plans.

Several other club members built similar boats V8s and Goths, and now Alternatives, so the following pages are mainly from my forst build, but also include other members photos.

To complicate the process, I react to Epoxy resin and many other chemicals, so please read this page to help working with Epoxy. Using Foam. Making foam plug. Glassing Hull. Finishing hull. Making a Wooden Boat. Making a wooden deck. To me, wood is much prettier, but glass is likely to give a lighter, possilby stronger boat, so faster if done well.


You can use correctors and put them in the right place for the conditions.Printable Catalogue. Boat News- photos from sailors around the world we ship to, many pages, lots to see, we hope it gives you ideas! Click on product image or text below. Lots more kitsspeed boats, timber build sailboats, ready to run kits and hulls to build up!

Downloadable files will allow you to print a boat at home in your choice of materials. Choice of colors and cloths, Spectre Sails since ! Boom Vangs, bottle screwspulleysrudder stocks, booms and more from Sailsetc! For these and other new items, keep a check in the New Products pages!

build iom yacht

Sailing in Salt water? You need this! Corrosion xcoat your reciervers and servos in the liquid and it forms a protective membrane that conducts electricity but shields moisture, protects for a long time. Boom VangsBoom Kits and new fittings!

VM01 Lightweight Vang from Varient is now available as a kit with round boom fittings pack,SailsEtc Vangs to suit Rectangular vangs are now also available with I boom fitting to suit round booms. Varient Boom fitting kits are for 11mm round jib and mainsailbooms found here click. Elastic return cord and dek patch material! Some international marblehead racing and then more new stuff!

New stocks of the highly popular Futaba 2HR have arrived along with recievers and parts! The New standard by Futaba. Features a lightweight handset, light reciever and 2 channels at a super low price! And More!!! A picture tells a words so we are slowly updating our drawings of products for items we have here, gives you an idea of what they are like and some are pretty special!

SailsEtc are always very functional and durable and the Australian made Hales Micro pulleys are simply the best, featuring stainless steel ball bearings almost do not need to use Corrosion X on them, almost!

Building a Vickers V8

Prepreg carbon and milled bronze speed machine.RCSails Sailmaking. Follow twitter. Anyway it is not difficult to build well cut and working sails. The more experienced the sail maker gets the better the sails work. This guide is intended to help newbies to cut heir own sails and build their own rigs. Sailmaking Tips: A piece of thin melamine board about 50xcm is very helpful to loft the outline of the sails. Use packing paper to sketch the outlines according the class rules or a finished sail.

Described here is building a sail set for the IOM class. The IOM class has exactly defined sail dimensions unlike other regatta classes. At right angle to this line we draw 3 lines in equal distance to produce the 4 width for the main sail 2 lines for the jib as it requires 3 width by the class rules.

build iom yacht

Wide spread materials for sail making are Mylar or Polyester Drawing Film in thicknesses of 50 or 70 micron. If you have to use rolled polyester drawing film you should roll it against twist on a larger roll for several days to counter the initial twist.

When gluing the prepared sheets don't forget remember to glue sheets with altering twist up and down and in longitudinal direction. We cover our drawn plan with the film and cut the sections with enough excess length. Don't forget to mark the line of maximum camber. Now we glue suitable two sided tissue tape without tension to the lower of two sheets to join.

It is very important to exercise no tension to the tissue tape or the sail, otherwise you will have wrinkles afterwards. When all sheets are prepared we can start joining them. We use a two part jig made from ply wood. We attach the lowest section to the jig using masking tape with the camber mark on the section and the jig in line.

Next we attach the upper section to the bend half of the jig the same way. The two sections should overlap by the width of the tissue tape. When everything is lined up careful remove the protective film of the tissue tape and glue the two sections together without tension and sufficient pressure. We proceed with the following sections the same way. Now we have the raw sail. We transfer the exact outlines from our drawing to the sail and can cut the sails now. The luff of the main sail should be convex to support the bend of the mast.

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To get this line cut easily we fix the luff at both ends with little tension and lay a 2m long cutting ruler along the luff. Now we lift the leech to get the sail off the surface. We can cut the luff along the ruler with a sharp cutter knife now. After cutting we will see a slight curve in the luff.

The solution with cans on the picture is not suitable - it was just made to take the picture. Best have a friend helping you or mark the luff with a pencil and cut it with a pair of scissors if no help is available.

If you wish more camber at the top of the sail simply lift the leech up slightly more - if you wish less then lower it slightly. The author then cuts a wedge of 5mm to the first seam, it is a good idea to cut the leech last when the luff is perfect; it is important to test fit the sail to the mast first in case there are some changes to be made on the luff. Spinnaker repair tape or other cloth tape works well for the reinforcements.

The luff of the main sail can be reinforced with this stuff as well.

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