Dinghy Boat Plans | Hull Turning Methods

Dinghy Boat Plans

I have shown a few projects in this blog over the past few months with the hulls being turned using different methods. The bigger the boat the more critical this operation is. The risks of damage to property and injury to people increase exponentially as the boat becomes more bulky and increases in weight. Imagine the difference between turning over a plywood hull that is 6.4m (21ft) long, 2.4m (710") wide, 1.2mm (311") deep and weighing 200kg (440lb) or a 50% scaled up version of the same hull. At 9.6m (316") long, 3.6m (1110") beam and 1.8m (511") deep, it will weigh 675kg (1488lb).

It has only increased 50% in all directions but the weight is more than 3x that of the smaller boat. The bulk becomes more difficult to manage and the weight to lift and lower becomes a major factor. If, at the same time as increasing the size, you also change to steel as the construction material, that same size hull could weigh 2500-2750kg (5500-6000lb). Now you are talking about some serious loads that can get out of control, yet the boat is still only 50% bigger in each direction.

Those smaller projects are easily turned over by hand, with friends and neighbours supplying the motive power and the boat having a soft landing on tyres or some other cushioning material. Years ago a client of mine in South Africa turned his 32ft hull by himself. He jacked it up on one side until it reached the balance point, then let gravity take it the rest of the way. It fell against a young tree, then slid down the tree and came to rest flat on the ground. Luckily his hull was relatively undamaged but the tree didnt survive the experience.

There are many ways to turn a hull but that is not one of them. I have a whole chapter on this subject in my book "Shaped by Wind and Wave", to give guidance on how to safely turn your hull. The two Didi 950 hulls that were turned recently in USA and Australia both used the spit-roast method. For each of my own big boats I have used a chain block to do the work, another of the methods explained in the book.

Turning the 38ft "Black Cat" using a chain block on a scaffold tower.

The book can be ordered either as a paperback or as digital for reading on whatever screen device suits you.

To see our range of designs, go to http://dixdesign.com/.

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Boat Plans Skiff | DS15 Didi Sport 15 Build in South Africa

Boat Plans Skiff

Until now I have only shown the DS15 prototype, being built in Virginia Beach, USA, by Aussie Hunter Gall. Hunters project is currently stalled due to circumstances but one of the the other builds is steaming ahead apace. This one is being built by Jim Foot in Port Elizabeth, South Africa. This weekend Jim applied the last coat of epoxy to the outside of his hull and is preparing to paint it.

This series of photos shows the basics of Jims project up to this stage. This is a radius chine plywood design, with hard chine along the topsides. It is the same family of designs as the Didi Mini Mk3 and Didi 950.

Frames set up on building stocks, with stringers going on.

Stringers all done and bottom panels fitted.

Same stage, showing stringers running into forefoot.

Side panels fitted and first layer of radius progressing.

Stitch-&-glue detail of topside chine.

Second layer of radius going over first layer.

Completed radius chine, running smoothly into flat panels.

Glass taping centreline seam. Jigsaw joints of bottom panel can be seen.

Epoxy coatings started.

Nice finish starting to show.

Clean stern and nice finish.

Final coat of epoxy, ready for sanding and painting.

I will show more of Jim Foots project as it progresses toward launch date. I tend to show the projects for which I receive the best photos, so please send me your best pics if you want to see your project on this blog or the Dudley Dix Yacht Design main website.

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