Didi 27 Retro

It has been a few years since we introduced the Didi 29 Retro, a gaff-rigged cruiser-racer based on our popular Didi 26 trailer-sailer sportboat. Bruce Mierke of North Carolina built his "Arabella" to this design with a modified (shorter) cabintop. Sisters are also being built in Africa, Europe, Asia and Australia.

Didi 29 Retro "Arabella", built by Bruce Mierke.

Inspired by "Arabella", another client commissioned a boat on the same basis but heading in a slightly different direction. The new boat is a classically-styled day-sailer with enough horsepower for exciting sailing.

The hull is based on the Didi 26, with some modifications. It has a plumb bow and aft the lines have been extended for a clean and powerful stern, ending in a radiused vertical transom. Along with that it has bulwarks forward, which taper aft into a normal toerail. The result is a more springy sheer curve.

Clean flush deck and centre cockpit

Bulwarks, bulb fin keel and spade rudder.

Being a dayboat, it has a clean flush deck with centre cockpit and no cabin structure. My client wanted only two settees down below with sitting headroom but I included a double forward berth to add the option of camp-cruising. A Porta-Potti and camp stove can be stowed under the cockpit and a boom tent can extend sleeping space to include the cockpit.

Powerful Marconi rig.

The rig is a powerful fractional Marconi sloop configuration, with square-head mainsail. The asymmetric spinnaker is flown off the end of a retracting and pivoting bowsprit. The deck-stepped mast is supported by double swept spreaders and there are also runners to help with the loads from the asymetrical in strong winds.

Camp-cruiser accommodation

My client wanted a fixed keel and a lifting keel will also be available. The foils are wood, sheathed in uni-directional glass, with a cast lead ballast bulb. The rudder is in a cassette that allows it to be lifted for servicing and for the lifting keel boats to get into shallow water.

We will be offering CNC kits for this boat, including the interior components. Plans are available immediately and kits in the near future.

To see our other designs, go to our main website or our mobile website.

Framing the 26ft Sportfisherman

The 26ft sportfisherman project now has its building stocks and is ready for framing to begin. The frames have been built, most of them permanent and a few temporary. A boat in construction often needs framing to be more closely spaced than it needs in use on the water. Temporary frames fill in the gaps where needed to add rigidity or to help shape parts of the hull where wood won't naturally take on the form needed.

Before setting up that first frame we needed to know how level the rails were that are going to support the frames until the hull is ready to be turned over. There is no point setting up the first frame sitting hard against the rails then finding as you progress that it is the lowest point on the rails. Using a laser level and a long batten we compared heights all over both rails to find the high points. Plywood spacers were added to the rails at the first frame position to get it above the highest point on the rails. All other frames are lifted as needed on plywood spacers and/or wedges to get them to the correct level.

Spacers under frames to get them level. The legs are screwed to rails and frames are screwed to the legs.

For this design I aligned Station 1, a temporary frame, with the forward transverse frame of the building stocks. For simplicity this frame is set up accurately in that position, then all others are referenced from that same location. It is good to measure all from that one position to reduce the chances of longitudinal errors. If you set up each frame measured from the previous one, the incremental errors can easily add up to 1/2" or more of cumulative error over the length of the boat. If you make one big error, that error would carry through the rest of the boat. You would discover it eventually when you attempt o lower the girders into place and find that they don't fit. At that stage you would have to reset all frames to their correct positions, wasted time and energy that is saved by doing it correctly from the start.

Station 1 (temporary) is on the left, set up first, secured and braced. The one on the right is a permanent bulkhead, supported by a temporary base and with light battens holding it stable. The deep slots in the upper edge are for permanent plywood girders that will be dropped in later to stiffen both hull and deck. The girders have matching slots and will accurately space and align the tops of the frames. Legs secure the frames to the rails. 

The frames are set up vertical and level by using a plumb line hanging from a line above the centreline of the boat and a laser level. The laser should be self-levelling for accuracy and should be set up so that it can shine onto all frames at the same time. Now is the time that you will discover whether or not your accurately-drawn waterline and centreline are really at 90 degrees to each other, as they need to be. The waterlines on one side are set up level for all frames while setting up the frames, then checked on the other side. There will likely be some minor errors on the second side to correct. Lift or lower that side of each frame where needed, bearing in mind that the frame will rotate around the contact point on the other rail, so the centreline of the frame will also move a small amount. So, correct the waterline to suit the laser and the centreline to suit the plumb line simultaneously. After all frames have been adjusted, move the laser back to the first side and check that, then adjust if needed.

All of the frames have been set up, accurately positioned fore/aft by measurement along the stocks and set up vertically with the aid of the plumb line that hangs from the centreline above the boat and level with the aid of a laser level. The light-coloured plywood is temporary, the darker pieces are permanent.

In this photo the frames have all been set up, checked and checked again. The laser level is at left, clamped to a post on the router table. The light is shining on all frames onto the waterlines that were drawn accurately from the drawings.

The forward two frames don't extend to waterline, so the laser won't shine onto them. To set the levels for these two you can attach a batten to the plywood with the waterline marked on it, or you can set the spacers to the correct level before setting up the frames.

Here one of the girders has been lowered into its slots in the frames to check accuracy. Other girders are lying against the frames. They are scarphed into long lengths from plywood. 

The next post in this series will cover laminating the keel and stem.

This design is not yet complete, so is not on our pricelist. See our full range of designs on our main website or our mobile website.

Another Kit for Kidz at Sea

I wrote a few weeks ago about the launching of a Didi 26 in Sint Maarten, built by school children participating in the Kidz at Sea program. The students enjoyed the build process, during which they learned useful woodworking and boatbuilding skills to help them in the future. This program has attracted considerable attention, with the Sint Maarten authorities welcoming the launching of the new boat and supporting both expansion of training of boatbuilders and increasing employment opportunities in the boating industry on the island. Prior to this build, the students have built a few smaller boats and this is their biggest project to date.

Last week Garth Steyn, who started the program, contacted me to order plans and a kit for the 2nd boat. This kit will be shipped to them within the next two weeks. The Didi 26 is a radius chine plywood racer/cruiser trailer-sailer that is available with either a short cruising cockpit that allows a transverse double berth under the broad bridgedeck or a long racing cockpit with port and starboard single quarter berths. The boats being built by Kidz at Sea are the racing long-cockpit version, with a fixed keel.

Garth Steyn speaking at the launch, with the instructor and students of Kidz at Sea.

Garth Steyn and Kidz at Sea students racing in the 2016 Heineken Regatta.

To see more about the Didi 26 and our other other designs for all materials, visit our website or mobile website.

Inlet Runner at the Wooden Boat Show

This time last week we were in Connecticut,  participating in the 24th annual Wooden Boat Show at Mystic Seaport. We drove there with two boats in tow, the Paper Jet prototype that we have exhibited the past few years, and the prototype of our new Inlet Runner 16 garvey powerboat design. Sorry, no hyperlink for that one yet, I am still working on the design package.

Paper Jet and Inlet Runner 16 nested for long-distance travels.

The Inlet Runner was built by Kevin Agee and exhibited by him in the "I Built it Myself" section of the show. As a first-time amateur boatbuilder with little woodworking experience, he made such a great job of his project that he took 2nd place in the amateur-built powerboat division, winning the Honourable Mention Award. Congratulations to Kevin for a job well done. I helped out at the end of the project with a bit of sanding but Kevin did everything else himself.

Inlet Runner in the "I Built it Myself" section of the Wooden Boat Show.

The Inlet Runner has my interpretation of a classic garvey hull.

 The Inlet Runner received a lot of interest and we have a few builders waiting for completion of the plans. Also a few requests for both bigger and smaller versions of the same concept. Watch for those on this blog in the next year or two but they must wait in line behind other projects that are currently in progress.

This boat has side seats aft and foredeck with lockers under for stowage, icebox, bait well etc. It also has a self-draining wet deck that can be left clear for fishing space or fitted with a swivel seat for flat-water fishing. We will also offer a Jonboat format with transverse seats and a centre console format on the wet deck.

Deck layout of Inlet Runner, set up for flat water fishing.

Overall, a successful show for us. Thank you Wooden Boat Publications, for organising this show for the benefit of lovers of wooden boats of all types. I look forward to being there again in 2016.

To see our full range of designs, please visit http://dixdesign.com or, for the mobile viewers, http://dixdesign.com/mobile