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LOA 3m 10ft Rowing Beam 1. And then rowing and motoring it. Again, if the video doesn't load try here. Normally it sits in davits on the back of our Skoota 28 powercat. Because of it's light weight, it is really easy to lift it up there.
The prototype Duo, above, and a nice bow wave when rowing at over 4 knots! Note the alternative basic inflatable rollers used as buoyancy tubes. Of course you don't need the tubes to sail it.
But if you are using it as a yacht tender as we do then the tubes are highly recommended. After-all there are good reasons why most yacht tenders these days are Ribs or airfloor inflatables. Drier, easy to come alongside without damage being two. It is also available as a nesting dinghy, so it can be stored on a cabin roof or even in the back of a car. Typical build time for the basic rowing boat ready to paint is 35 hours.
Duo is really two boats in one. The detachable, inflatable collars mean the boat is narrow on the waterline, as that makes the boat lighter and faster, especially when rowing or motoring with a 2hp outboard. Yet the collars mean the Duo remains safe, stable, dry and buoyant. Then, in sailing mode, with the collars removed and the "wings" added the Duo is a fast, fun and safe boat.
The photo below shows another Duo with "Dinghy Dogs" fitted. Much neater than the inflatable rollers. The rowing, sailing and nesting plans are now available. A quote from a builder "Thank you very much for the updated plans for the Duo. Just had a quick look over them and I think the solution to the nesting joint is brilliant. A beautifully simple approach to solving this problem! The complete set of plans comprise 27 sheets, which you can print out on A3 paper legal or A4 letter.
Although sensibly only one person or maybe two children or adult and small child will sail the Duo it is safe to take three adults when rowing or motoring.
Not a great photo, but this does show our Duo being rowed with three adults on board. I weigh 80Kgs, the two women with me somewhat less.
The Duo is also used as the main hull for the Tryst trimaran. You can build the Duo and then add outriggers later which is what I did. Detailed Duo Dinghy Design Comments March scroll down for build and nesting photos, videos and the latest news.
I've built and owned a number of my Crayfish dinghies. Despite being a 30year old design, it's a great 8ft plywood yacht tender and still selling well. However, now that we have a powerboat the Skoota 28 powercat as our main cruising boat, I wanted to have a dinghy that sailed better, one that I would enjoy sailing when we were anchored. So I have spent some time developing a new design, the 10ft Duo. I grew up sailing a pram bowed boat the Poole AB so know from personal experience that a stem ie pointed bow would be faster and more seakindly.
Furthermore a longer boat makes a better rowing boat - it tracks better and is easier to row. Obviously the longer the boat, the heavier it is, but I still wanted a boat that would be easy to lift on board and to carry, not drag, up a beach.
It had to be safe and seaworthy for two people or three at a pinch plus have sufficient built-in buoyancy to support the crew if swamped. Inflatables and RIBs are popular as tenders, in part because they don't scratch a yacht's hull when coming alongside. They are also very stable and are easy for swimmers or divers to re-board, while at the same time the tubes help keep the boat drier when motoring.
Cheap inflatable boat rollers are clipped to the outer hull sides. They add lots of reserve buoyancy, yet keep the cockpit clear - just like a RIB. Obviously they can still be easily removed and used as rollers if necessary. And certainly agile, experienced sailors will unclip them when sailing. As our Duo will be used as a tender for our Skoota 28 powercat we have also fitted a "bumper" round the bow.
Unfortunately a RIB doesn't make a very good sailing boat, and some find conventional small dinghies uncomfortable to sail and prefer to have a seat to sit on, not wet floorboards. Such wings have been used for years in International Moths, 49ers and other high performance dinghies, as well as on beach cats like the Hobie 17 and 18, but rarely on small boats.
Note, these wings are not needed for heavier helms sailing in light winds. Duo has a simple unstayed 2 piece mast, which stows on the boat for transport without overhanging, and also makes it possible to rig while in the water alongside the "mothership. It also puts the main thwart further forward, which means the crew weight doesn't drag the transom when rowing.
The hull is not a true planing hull, after all you cannot plane when rowing! The photo above shows the Duo on its first sail, complete with both wing tubes and a partial hull collar. The latter is suggested for beginner sailors, but is not needed for those with more experience, see the later videos and photos below.
A prerequisite had to be that the boat was simple, quick and cheap to build. It also had to be durable. I have found from bitter experience that a fabric dinghy does not last long when "out there doing it. So I designed Duo to be built in hard-chine plywood. Fortunately this is also the lightest building material for a boat this size. There are lots of single sheet plywood boats around, but they are all too small for what I wanted.
So I decided to draw a two sheet boat - hence the name. And as you can see, there isn't much scrap ply left! I also set myself an arbitrary two day build time. That meant I needed to simplify every stage of construction. For example, even though the hull has a pronounced sheer which helps keep the boat dry , the gunwales are actually straight on the ply sheet, so you only need to mark and cut a curve along the keel line. A V-shaped transom reduces drag compared to a flat bottomed boat, especially at low speeds.
But the V is not the whole length of the hull as that adds weight, extra building setup time and more glass taping. Fortunately I only had to compromise the hull slightly to get all the panels for the rowing version but including the daggerboard case and buoyancy compartments fore and aft from two sheets.
As well as a high bow, I also drew a high stern to take an outboard. If it were too low then the transom could go underwater when working on the engine or even starting it. The outboard or an electric motor is offset to port if right handed making it easy to start and control. One final item not seen on small dinghies, but common on racing boats is an opening transom flap, so no bailing after a capsize or a swamping.
Many people build an overweight boat "because it's stronger," but it's also heavier and in fact, unnecessarily strong. I've built 14ft racing dinghies in 4mm ply, while my 15ft trimaran has a 4mm mainhull and 3mm outriggers.
So using 4mm ply for a 10ft dinghy will not cause problems. A bonus is that cutting out 4mm ply takes half the time of 9mm, which speeds construction. And, as 4mm ply only weighs 6kgs a sheet, the whole boat will weigh under 20kgs, making it very easy for one person to lift and carry.
I have also drawn a nesting version, with the join at the front edge of the thwart. That means the Duo can be stored onboard smaller boats, and can fit inside a car, rather than on the roof. Photo below shows an Australian built Duo. The conduit tubes on the outside of the hull will take the inflatable beach rollers. Total build time so far is 15 hours. The weight so far is 40lbs, including the two clamps, which weigh more than the extra glue and glass still needed.
I haven't ever tried to hold a 10ft long boat above my head before, it's more difficult than it looks! It is much easier to lift it with two fingers. Today we launched the Duo and rowed it for the first time. It is effortless rowing with one person. I did try a kayak paddle, but as expected the Duo has a bit too much freeboard for paddling to be efficient. I have not yet fitted the inflatable tubes, which will help stabilise the boat, much as they do on a RIB.
We borrowed the overlong oars, which made it awkward to row. The build time to date, including the daggerboard case, outboard bracket, mast step and two coats of paint is 35 hours.
Weight as seen here, including galvanised rowlocks, outboard bracket, daggerboard case and mast step is Even without the collars the Duo is safe and stable, as the bow stern and thwart are all buoyancy compartments. You can see a rowing video below, or here if it does not load www. Even I am surprised how fast it is in light winds. It's also fun to sail, it's definitely not a "slop along placidly" sort of dinghy. Recently we tried a Suzuki 2. It does 5 knots at less than half throttle. With two people on board we did between 5.
Premier UK cruising magazine Yachting Monthly recently ran a test on alternative yacht tenders ie not inflatables.
For starters a paneling is entrance detached. As others have already remarkableas of September 2010. Earlier than we squeeze the vast yield of plywood from your internal distributor exam a timber to determine it was scrupulously done as well as is honeyed peculiarity prior to we deposit income as well as time in structure your plywood vessel.
We had an old-fashioned 10 HP Briggs plane missile electric proceed engine from an aged pushing mower which build a dinghy from plywood 00 similar to it will compare a check .
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