Boden Boat Plans Australia | More Argie 15 Sailing

Boden Boat Plans Australia

John Read in Cape Town built himself an Argie 15  and has been sailing it a year or two. He has made a video of him sailing it in breezy and gusty conditions on Rietvlei, in the suburbs of Cape Town. John has learned much about his boat and is now very comfortable with her characteristics. In this video she shows some of the speed that these boats manage to achieve.

John is obviously enjoying his Argie 15, which is our most popular design.

The beautiful Table Mountain stands guard over Cape Town and is visible in the background of some of the shots.

Please visit our website at http://dixdesign.com/ for more on this and out other designs.

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Plywood Boat Plans Australia | Water Tanks

Plywood Boat Plans Australia

My current boat ( 28 Carver Mariner) has a whopping 25 gallon water tank and Im amazed at how long we can make that 25 gallons last. On the current boat we use water primarily for washing dishes and an occasional quick shower. The head on the Carver is raw water flushed so we dont tap into that precious 25 gallon supply.

The water tanks on the trawler ( I guess Im going to have to name her soon so I stop calling her the " trawler ") are constructed out of stainless steel. I went with stainless steel vs plastic for a few reasons. Stainless is considered top of the line in regard to potable water tanks. Due to where Im placing the tanks it made more sense for me to fabricate the tanks vs having them fabricated out of plastic. I used 14 gauge 316L for fabricating the tanks. All the associated fittings for the tanks are 3/4 NPT stainless ( fill, vent, supply) couplers welded in place. All the tanks have one center baffle running across the width of the tank. The tanks fit between the frames of the forward area so the tanks have to fit into a 30" wide space. Because of the 2" flange I welded on to the frames I had to make the tanks 27" in width to give me a little room for the install. I might be kicking myself in the ass years down the road, but I decided to not install inspection covers in the tanks. I have a total of 8 tanks giving me approximately 350 gallons of water.

The tanks are held in place with a flange welded on to the front and back of each tank. The forward mounting system consists of a bracket welded to the hull with 3/8 studs welded to that bracket. The forward tank flange fits over those 4 studs and is bolted down. The rear mounting system consists of a similar bracket only I welded nuts to that bracket and used four 3/8 bolts through the tank flange to mount the rear part of each tank. I used studs on the forward mounting system because the bracket is so deep it was easier to get a nut started vs getting a bolt started. It was also easier installing the tank by dropping the tank over the studs then having a little wiggle room to get the bolts started in rear of the tank. For 3/8 studs and bolts I drilled the corresponding mounting flange to 1/2 " and used thick washers for the mount. I made a gasket out of flexible PVC to help isolate the tank bottom from the mounting brackets ( no metal to metal contact other than the mounting hardware). I allowed myself 4" of clearance between the front of the tank and the center longitudinal frame ( center spine). 4" of clearance was barely enough room, as it is a tight fit to get my arm in there. All the tank mounting hardware is stainless steel

To supply water to the pump I welded a 3/4 stainless coupler in the the bottom of each tank. Having given this a little more thought I now wish I had used a pick up tube entering the top of the tank and going to the bottom. Too late for the pick up tube method now, but again I wish I had gone that route. So each tank has a coupler welded in for supply, followed by a gate valve for each tank,followed by a "T" for each tank, all of this terminates into a common supply line leading to the pump. I went with this set up so I could isolate each tank vs all eight tanks having a shared liquid level. If I ever have a catastrophic failure of a tank, I can take that tank off line and not loose all my water. I also have the choice of just filling a couple of tanks if I want. Since I am able to isolate the supply side of the tanks, I also have to be able to isolate the vent side of the tanks. All the vents will terminate at a manifold that can be valved before venting at the wheel house deck above the fill point. The tanks will fill from two points on the wheel house deck via port or starboard fill pipes. Because of the large cabin and wheel house roof areas Im making provisions to be able catch water off the roof to fill the tanks.

I air tested each tank to 6 psi as this will be more than the static head the tanks will see once the vent tube fills to the deck level. After I fabricated the tanks I installed them to check fit and make sure all my brackets would work so I could start the interior painting. If I had been a little more careful with my measuring and fabricating I could have squeezed another 50 gallons of storage in my system, but all in all Im happy with 350 gallons.

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Boat Plans Canada | Didi 950 Build Started

Boat Plans Canada

Michael Vermeersch of Ohio commissioned the Didi 950 design and has now started construction of his boat. He is building from a pre-cut plywood kit that was supplied by Chesapeake Light Craft in Annapolis. The kit arrived as 61 sheets of plywood with all components accurately cut by CNC router and packed on 2 pallets.

Michael reports that he is progressing well with the assembly of the backbone and bulkheads and that everything is fitting together beautifully. A few more bulkheads to go, then he will be ready to start setting up on the building stocks.

Michael with wife Pat & daughter Catherine.

Since adding this design to our stock design list, another three boats have been started. They are in Australia, Greece and Latvia.

The Didi 950 is drawn to the Class 950 Rule and detailed for building by the radius chine plywood construction method. It can be built from plans only or from a kit. Kits are currently available in USA but can be supplied by most of our international kit suppliers as well. Enquire with the supplier in your area and I will send the files to them for pricing. Note that for USA you must order from us, you cannot order it directly from Chesapeake Light Craft.

For our full range of designs, please visit http://dixdesign.com/.

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Plywood Boat Plans Australia | Cape Henry 21 Launched in Croatia

Plywood Boat Plans Australia

Dean Ivancic lives in Porec, Croatia. He bought plans from us a few years ago for the Cape Henry 21. He has been working steadily on his boat and reported to me today that he launched her in April. He has sent me some rather nice photos of her under sail. She is still incomplete down below but has all that is needed to sail.

She is named "Scintilla", Italian for "spark", also the meaning of "Iskra", the Croatian name of Deans youngest daughter.

We wish Dean and his family lots of fun and adventures in their Cape Henry 21.

"Scintilla" on one of her first outings.

Pretty from any angle.

Dean has done a nice job of building "Scintilla".

The Cape Henry 21 is surprisingly quick and has delightful manners. These boats prove that a boat doesnt have to be ugly to be fast.

For more on this design and others in our range, go to http://dixdesign.com/.

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Kayak Boat Plans | Didi 950 Hulls Taking Shape

Kayak Boat Plans

The Didi 950 projects of Fred Grimminck in Australia and Mike Vermeersch in USA continue in parallel. Freds build is from plans only and Mikes is from a kit that was cut by CNC router. Both have completed the flat sheet panels of the sides and bottom and are now skinning the radiused parts of their hulls. This is the stage that the hull shape really starts to show.

Some of the photos that I show of these two projects show minor differences, due to building from a pre-cut kit or with the builder cutting all components. Both produce the same boat at the end of the process but they may look a little different at times while being built.

Side and bottom panels all completed, ready for radius to start.

The photo above is of Mikes kit boat, with neat edges at the sheer (where hull and deck will meet). The photo below is of Freds boat with irregular edges at the sheer. This is because the kit panels are supplied with a uniform strip of waste to be trimmed off to the final line after turning the hull over, while the boat built without a kit has the panels inividually cut by the builder and the waste width may vary.

Same stage, Freds boat. Backbone still to be trimmed at forefoot.

The radius is skinned in two layers, made with narrow transverse strips. The first layer lies on the stringers and the doublers of the tangent stringers, fitted between the edges of the side and bottom panels. These edges have rebates pre-cut into them and onto which the second layer will be laid.

First layer of radius being fitted to Mikes boat.

The rebate along the edge of the side panel can be seen in this photo.

Final hull shape starting to become clear.

Construction of the boat in Latvia has now started and the boat in Greece will soon follow. To see more of this design and others in our stock design range, please visit http://dixdesign.com.

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Boat Plans Pdf | Dudley Dix Yacht Design Calendar 2015

Boat Plans Pdf

Our 2015 calendar is ready and our first stocks arrived today. If you are a lover of our designs then this calendar will be a great piece of art to fill that empty space on the wall of your office, home or workshop.

The cover photo (also November) is a beautiful sunset photo sent by Phil Semenov of his self-built Didi 34, sailing in Ukraine.

Here are a few other sample pages.

June is a collage of photos showing the Cape Henry 21 built by Roeboats of Co Cork in Ireland. They used some interesting and very pretty detailing in this boat, built for a customer from France.

August is the Didi Sport 15 project of Hunter Gall in Virginia Beach, USA. She is named "Scallywag", which is what Hunters grandfather called him as a child. The main photo is an interesting view during construction and has a somewhat spiritual feel.

December is Petr Muziks Shearwater 39 "Shoestring III" sailing in St Helena Bay, South Africa. Petr circumnavigated on this boat when well into his seventies.

Order your calendar from our website via the link on our homepage at http://dixdesign.com/ and we will mail it to you.

Alternatively, click here to order from our  publisher, Lulu. They will print and ship one copy, or as many as you want, from their closest affiliate to your delivery address.

Either way, get yours now to be ready for January 2015.

If you have one of our boats and would like to see it featured in one of our calendars, please send me some nice high resolution photos of her. The pics need to show her in pretty surroundings or to be interesting in some other way. Now is a good time to start with the 2016 calendar.

And if you want to see more about our designs, please visit our website at http://dixdesign.com/.

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Boat Plans And Kits | New rig for Didi 29 Retro

Boat Plans And Kits

The Didi 29 Retro was commissioned by a client in Cape Town, to build for himself for competition in the classic yacht races in the Caribbean. He wanted a boat with modern underbody and appendages but with a large gaff rig of classic configuration, to race in the modern classic division.

Underbody of Didi 29 Retro

Last year I was asked to draw a more conservative cruising gaff rig for the design, to better suit those who have no aspirations to race with a big crew or simply want to cruise. That resulted in the cruising gaff rig with about 20% less sail area on the same foretriangle height.

Didi 29 Retro racing gaff rig at left, cruising rig at right

This year I was asked to draw a more modern rig for it, which developed into the squaretop Marconi rig. This one will better suit most sailors, being easier to handle and easier to understand for those who dont know gaff rigs. On sail area, it fits between the two gaff rigs and it will be interesting to see how the three compare on the water.

Didi 29 Retro with squaretop Marconi rig

The squaretop Marconi rig suits the aesthetics of this hull rather well. It would be my choice if I were building this boat for myself. Should be an exciting boat to sail too, able to take advantage of the power of modern stable sail fabrics.

To see more of this and our other designs, go to http://dixdesign.com/

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Boat Plans At Mystic Seaport | Didi 950 Up and Over

Boat Plans At Mystic Seaport

This seems to be a period of hull-turning. About 10 days ago I posted about the Didi 26 being turned in Hood River, OR. Now I am doing the same for Mike Vermeerschs  Didi 950 in Ohio.

Mike turned his hull this weekend and it went very smoothly and safely. It is a much bigger boat, with more weight that can potentially get out of control and more height needed to successfully accommodate the hull on its side as it goes through the process. Bigger and heavier boats need more care, preparation and equipment than is the case with smaller boats.

Mike chose to turn it using the spit-roast method. This is only one of many methods that I describe in my book "Shaped by Wind & Wave".

Turning by this method is done by attaching axles to both ends of the hull to suspend it on supports (Mike used engine hoists) while it is rotated on the axles. Care must be taken to get the axles on centreline and close to the vertical centre of gravity of the hull, to keep the rotational forces small. In this case Mike asked me for the position of the VCG, which he says proved to be spot-on. Once lifted, he turned it by himself, exerting about 20lb of force to rotate the hull. These photos tell the story.

Spit-roast axles ready to be fitted.

Axle bolted to transom.

Axle bolted to bow.

Axle in chain sling attached to boom of engine hoist.

Lifted on engine hoists and turn started.

Almost over.

Cradle ready for the hull, on castors for easy moving.

Safely settled in her new cradle and ready for interior work.

Thanks Mike Vermeersch for the great photo series.

To see more of this and our other designs, please visit. http://dixdesign.com/

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Dinghy Boat Plans | More on Stability with Water Ballast

Dinghy Boat Plans

John Gilbert asked a question in response to my recent post, Stability with Water Ballast.

I do not get why the red and blue curves do not meet up at 180 degrees. Inverted the boat has no windward side as you point out, so you have water ballast on one side and none on the other side. As you have drawn the curves you have powerful stability in the  inverted position with the water on one side (red), but actually a righting moment if you have water on the other side(blue). What is the difference?

To help with understanding this I thought it better to write a new post that expands on the dynamics of stability than to try to answer it in the comments section after that post.

This will be more easily understood by seeing a diagram showing the stability graph expanded through a full 360 degrees rather than all conditions overlaid on top of each other in a 0-180 degree range. This is exactly the same stability info for the Didi 950 as shown in the graph of my earlier post but shown in a different manner.

Diagram of Stability through 360 Degrees

I will start with the green curve. This shows the stability without water ballast. The centre of gravity (CG) is on centreline. The stability curve intersects with the horizontal grid line at 0 degrees heel and increases identically both to left and right of the 0 degree line, so the boat will float without any heel to either side when right way up. The boat will stay that way in the absence of any wind, wave action or crew movement on the boat.

Follow the green curve until it comes down past 130 degrees to again intersect with the horizontal line at the Angle of Vanishing Stability (AVS). Then it enters a range of negative stability where it will proceed toward upside-down. At 170 degrees it crosses to above the horizontal line again. This indicates that the superstructure volume is trying to turn it back upright and doesnt want the boat to lie totally inverted. It will easily flop back and forth between the 170 and 190 degree points. The boat can return to upright along either green curve.

This all depends on a totally waterproof superstructure, of course. In practice water is likely to enter the boat at a rate that depends on what is open at the time, which will affect the inverted stability. 

Moving on to the stability with water ballast, in my earlier post I said that the boat will capsize along the red curve and recover along the blue curve. I explained the relationship between the two curves but that relationship is not easy to visualise if only seen across the 180 degree range.

In the diagram above you can see that the red and blue curves only meet in two places and both are on the horizontal line. These are the two points at which the boat will rest when there are no outside influences from wind, waves or crew movement.

The boat cannot rest totally upright nor totally upside-down because the weight of the water to one side is heeling it toward that side. It will rest at approximately -5 degrees heel instead of upright and at 200 degrees instead of upside-down when inverted.

Bearing in mind that the areas of the curves below the horizontal line indicate how much energy it needs for the boat to get past the AVS points so that it can right itself when in that 200 degree situation, it is now easy to see that it will take a large amount of wave energy to get past the AVS of the red curve but a very small amount of wave action to get past the AVS of the blue curve.

This graphic shows that if a water ballasted boat capsizes it will do so along the red curve but it is very unlikely to return along that same path, nor is it likely to stay capsized for long. Once past the AVS of the red curve the negative stability will push it to 20 degrees past upside-down. After that the blue curve will take over and almost guarantee that the boat returns to right-way-up pronto.

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Boat Plans For A Chesapeake Deadrise | Didi 950 Construction Starts

Boat Plans For A Chesapeake Deadrise

Michael Vermeersch has started building his Didi 950 prototype in Ravenna, Ohio. This is the prototype of a very new design. Micheal is building from a pre-cut kit that we supplied and reports that the quality and fit have been excellent thus far.

Didi 950 Kit, ready for unpacking

 Yesterday Michael and a friend set up the bulkheads on the building stocks and he is now preparing to fit the backbone components to tie the bulkheads together.

Didi 950 Bulkheads set up and waiting for backbone.

This design has been drawn to comply with the Class 950 Class Rules. Watch this space for progress reports on this boat and the other Didi 950s being built in Australia, Latvia and Greece.

Please note that precut kits for our plywood designs supplied in USA must be ordered from Dudley Dix Yacht Design and not from the company that cuts them, Chesapeake Light Craft. For more info and pricing go to our plywood kits page.

To see our full range of designs please visit http://dixdesign.com/ .

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Wood Boat Plans And Kits | Kits for our Plywood Boats

Wood Boat Plans And Kits

Kits for our plywood boats have been available in USA for more than 10 years. This has had mixed success, depending on who was cutting the kits. Following on the sale of the company that had the rights to cut our kits, the quality of service deteriorated to a level that was no longer tolerable, so I rescinded the cutting rights. That brought us to the current arrangement of marketing the kits ourselves and sub-contracting the cutting to Chesapeake Light Craft in Annapolis.

This has worked out very well. The quality of the kits supplied to date has been excellent and the shipping has been both economically priced and efficient. They have cut numerous dinghy kits, including the Dixi Dinghy  and the Paper Jet.

Plywood Dixi Dinghy, fun little 3:1 dinghy to row/motor/sail.

The are currently preparing to cut a large kit, comprising 61 sheets of plywood, for a Didi 950 that will be shipped to a builder in Ohio. This is a radius chine plywood boat with topside chine that is designed to the Class 950 Rule and makes a very nice fast cruiser, in addition to its primary racing purpose.

3D image of radius chine plywood Didi 950

We have also sent them an order for a smaller but nevertheless substantial kit. This is for a Didi 29 Retro that will be shipped to a builder in North Carolina.This is also a radius chine plywood boat but without the topside chine. It is a development, in classic image, from our popular Didi 26 trailer-sailer design and will be rigged with the cruising rig option of the two gaff rigs that we supply with the design.

3D image of radius chine plywood Didi 29 Retro

I have reworked the panel files for these large kits so that all parts that are larger than a sheet of plywood are jointed with jigsaw joints. These joints are easy to assemble and produce very accurate panels.  Click to read about jigsaw joints.

The range of plywood kits that we can offer in USA is expanding fast. Click to see the full list. If there is a plywood design for which you want a kit, please email Dudley and ask for a price. It may take a week or two to rework the panel files to suit the Chesapeake Light Craft format then get a price for the kit but we will get that info to you as speedily as we can.

If you are outside of the USA, you can still order one of our kits from our suppliers in other countries .

To see our full range of boat designs, please visit http://dixdesign.com/

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Boat Plans Aluminium | Long Distance in a Bigger Boat

Boat Plans Aluminium

My last post was about people going long distance in small boats and most of my readers know that I am soon to go long distance in a slightly bigger boat. This will be on the Didi 38 "Black Cat".

She is well on the way to being ready, with smaller items like installation of new electronics going on and the major still outstanding items being to tune the rig and test the new sails (which have still to be delivered). She is looking awesome, after a full repaint and new graphics. This 18-year old lady is looking young again.

"Black Cat" with her new paint & graphics.

Preparation of "Black Cat" for her next adventure has been a lengthy process but a worthwhile one. It was unfortunately extended by 2 weeks due to damage sustained at Royal Cape Yacht Club during a gale just after she was relaunched when the repaint had been completed. Cape Town is well known for furious winds and this one apparently gusted to 75 knots in the yacht basin. Some mooring chains holding the marinas broke and "Black Cat" was in the unfortunate position of serving as the meat in a steel sandwich, not good for a plywood boat.

My navigator for this race is Dave Immelman, nicknamed Wavy. Dave has been in charge of the preparations and has done a great job of it. That includes getting the extra work done that resulted from poor "Black Cat" getting squeezed tighter than any lady in a corset. She has been freed, repaired, repainted (again), given the OK by the doctor (scrutineer) and is raring to go.

New Cat logo on port side. Starboard has the butt end.

 This is a boys adventure on which we are embarking. As in 1996 and 2000, "Black Cat" will be the only lady enjoying it with us. That said, we would not be doing it without the support of the other ladies in the lives of all of the crew, namely wives, mothers, daughters and others. They tolerate our passion for boats, adventures and ocean crossings. Maybe some of them look forward to our departure to get us out of their hair, I dont know. I do know that they will be happy to see us again when we return and we will be equally happy to be greeted by them when our adventure is over. We will return home with another big drawer full of images in our memory banks, memories that cannot be equalled by any travel documentary or computer game, no-matter how good the filming or graphics may be.

For those who have never experienced this, it is a big one to add to your bucket list. Having done it 3 times before, I can say that it will take a big bucket if it is to hold other items that are bigger than this one. But you have to have a strong sense of adventure and not be easily scared. If you dont have those qualities you will be petrified at times, incapacitated by sheer terror while your shipmates are enjoying a great roller coaster ride that goes on for 2-4 weeks (depending on the speed of your chosen boat), with no chance of getting off the ride.

We have sailed this boat very hard in the past and the new go-fast goodies on her will help us to do so again. We sail her safely but we do so sometimes at very high speed, with lots of spray flying by and mixed in with flying fish, squid, albatross  and even the occasional sword fish. "The Cat" enjoys it and allows us to enjoy it with her.



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Boat Blind Plans | Didi Mini Mk3 Kit from CKD Boats

Boat Blind Plans

I would have to dig deep in my files to find when CKD Boats first started cutting kits to our plywood designs. Owned by Roy McBride, this Cape Town company has the longest history of cutting our kits and has shipped kits for our plywood boats to many countries around the world. They also have the most experience with packaging large or small kits securely enough to arrive at their destination without damage or loss.

The most remote was a Didi 38 kit sent to Johnston Atoll in the North Pacific. It was a very comprehensive kit that included all plywood, complete rig, keel, engine, sterngear, galley equipment, deck hardware, pulpits, sails and even pre-cut window panels and all the cushions pre-upholstered. This was all packed into a standard 20ft container and had to be shipped via New Zealand and Hawaii, all expertly managed by Roy, his staff and his subcontractors.

CKD Boats has just completed cutting a kit for the Didi Mini Mk3 for a customer in France. It will be packed next week for shipping.

Didi Mini Mk3 sheet fresh from the CNC router.

The plywood components are held in place in the sheets by thin tabs that are left between the full-depth cuts. They are released from the sheets by cutting through the tabs with a box-cutter or jigsaw. This system keeps the plywood as full 8x4 sheets for easy packaging and protection of the components from loss or damage.

Didi Mini Mk3 hull skin panels with jigsaw joints.

The Didi Mini Mk3 is one of the first boats that I converted to jigsaw joints instead of the stepped scarph joints that we used previously. This results in easier assembly and is easier to cut, with less machine time involved. These two panels both show a narrow cut on one side and a wide cut on the other. The wide cut is at the junction between flat and radiused panels, so it has a half-depth rebate pre-cut full length of the panel for the structural joint of the radius panel to the flat sheet.

When this kit is out of the shop, the next will start cutting. This is for a Didi Sport 15 to fill an order from a South African builder.

To see these designs and others in our very broad range, please visit http://dixdesign.com/.

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