Dugout canoe with outrigger
One sound log, fire and an adze: a two-person canoe with walls 2.5 cm thick, and an outrigger float that keeps it upright on open water.
Home: On water, Level 1 · Foothold, level 1 of 6 in its track. Serves 1 step.
Every build on this site has hazards that injure or kill — quicklime, carbon monoxide, molten metal, collapsing ground. Read the safety notice before starting, and read this build's own failure modes below.
What it is and why this shape
The dugout needs no joints, no fastenings and no sealant: fire does most of the work, and stone or iron tools the rest. The Pesse canoe from the Netherlands, about 10,000 years old, is the oldest boat known. Alone it is fast and rolls easily; with an outrigger float 1.4 m out it resists rolling both ways and can carry a sail.
Dugout canoe from a 65 cm log
Fig 1
TimberVoid / air
Outrigger, in plan and end view
Fig 2
TimberWater
Keyed parts
| 1 | Hull | 4.6 × 0.64 m, 0.38 m deep; walls 2.5 cm, bottom 5 cm. |
| 2 | Bulkheads | Two left uncut, 4–5 cm thick, about a quarter of the length from each end, to stiffen the hull against splitting. |
| 3 | Gauge pegs | Every 30 cm along both sides and the bottom, drilled from outside to the finished wall. |
| 4 | Booms | Two, 2.0 m apart, lashed across both gunwales. |
| 5 | Float | 2.8 m × 15 cm, 1.4 m from the hull's centreline. |
| 6 | Float lashings | The float lashed under the boom ends, or on short pegs, so it just rests on the water with the crew aboard. |
Specifications
| Log | 65 cm or more × 4.8 m | Straight, sound to the heart, a light wood. |
| Canoe | 4.6 × 0.64 m, 0.38 m deep | Top cut flat 38 cm up the log. |
| Walls | 2.5 cm sides, 5 cm bottom | Set by gauge pegs. |
| Capacity | 2 people and gear | US Coast Guard rule: 15.1 ft × 2.1 ft ÷ 15 = 2. |
| Draught with 2 | about 20 cm | Leaves about 18 cm of side; FAO asks for 13 cm (0.2 × beam). |
| Outrigger | float 2.8 m × 15 cm, 1.4 m out | On two booms 2.0 m apart. |
| Weight | about 120 kg | Worked green and kept damp: a four-person carry. |
Bill of materials
| Material | Quantity | Notes and substitutes |
|---|---|---|
| Log | 1, 65 cm or more × 4.8 m | A light, easily worked wood: cedar, pine, poplar, basswood, cypress, or a local canoe tree. No rot or hollow at the heart: check both ends. |
| Wet clay or mud | a bucketful, kept wet | Laid along the edges the fire must not burn. |
| Gauge pegs | about 40 | Dry, 1 cm across, of a wood of another colour. |
| Float | 1, 15 cm × 2.8 m | The lightest dry wood you have; it must pass the raft's float test. |
| Booms | 2 × 2.2 m, 8 cm | Straight and springy: ash, hickory, bamboo. |
| Cord | about 40 m, 6–8 mm | For the boom and float lashings. |
| Grease or pitch | — | For the end grain, against splitting. |
| Two paddles | — | From the ground to the paddler's chin. |
Tools: Axe · Adze · Fire, and a way to carry embers · Auger or bow drill, 1 cm · Scrapers of stone, shell or iron · A chalk or charcoal line
Construction
Choose the log
A straight log at least 65 cm across and 4.8 m long, sound to the heart. Check both ends for rot, a hollow centre or long splits; knots in the walls become holes. Light woods float higher and work faster. Work it green, which carves far more easily, and keep it damp and shaded from the day it is felled.
Cut the top flat and shape the outside
Snap a line along the log and cut the top off flat 38 cm above the bottom of a 65 cm log: the widest part stays just below the gunwales, where it gives the most stability. Rough the outside to shape: taper the last 0.8–1 m at each end to a rounded point, lift the ends slightly, and flatten a strip about 15 cm wide along the bottom so it sits upright on the ground.
Drill the gauge holes
From the outside, drill 1 cm holes every 30 cm along both sides and the bottom, to exactly the finished wall: 2.5 cm in the sides and 5 cm in the bottom. Drive a peg of a different-coloured wood into each. Inside, you stop carving wherever a peg shows.
Hollow with fire and adze
Leave two bulkheads uncut, 4–5 cm thick, a quarter of the length from each end. Lay a small fire along the top between them. Pack wet clay or mud along every edge that must not burn, and keep it wet. Let it burn to charcoal, scrape the charcoal out, and repeat; square up with the adze between burns. Stop burning 5 cm from any line: a fire that gets into a wall makes a hole.
Finish to the pegs
Near the walls, work by hand only. Carve until each peg shows, and feel the thickness between finger and thumb, both sides at once: even walls matter more than thin ones. A thick patch makes the canoe list; a thin one splits.
Seal the ends and keep it damp
Rub grease or pitch into the end grain. Keep the canoe in shade, off the ground and damp, or sunk in shallow water between uses: sun and dry wind split a dugout along the grain.
Fit the outrigger
Lash the two booms across both gunwales, 2.0 m apart and square to the hull. Lash the float under their far ends, 1.4 m from the hull's centreline, so that with the crew aboard it just rests on the water. Make each lashing 8–10 turns with frapping turns, and check them before every trip.
Test it
In calm, waist-deep water, two paddlers sit and both lean towards the float: it must not go under. Then both lean away: it must not lift clear. Then load to capacity, two people and their gear, and check that at least 13 cm of side stays clear of the water (FAO: 0.2 × the 64 cm beam).
Tolerances that matter
| Dimension | Target | Why it matters |
|---|---|---|
| Side walls | 2.5 cm ± 0.5 | Thicker is heavy and lists; thinner splits. |
| Bottom | 5 cm | Takes the groundings and the load. |
| Side above water at full load | at least 13 cm | FAO's minimum for an open boat: 0.2 × beam. |
How this fails
Rot or a hollow at the heart, found halfway through: check both ends first, and bore a test hole if in doubt.
Fire in a wall. Keep the fire small and the clay wet, and stop burning 5 cm from any line.
Uneven walls, so the canoe lists or splits at the thin place: use every gauge peg.
Drying in the sun. It splits along the grain; keep it damp and shaded.
No outrigger on open water. A narrow dugout rolls over the moment someone stands or leans out.
How you know it worked
VerificationEvery gauge peg shows inside; the canoe floats level; the lean test passes both ways; loaded with two people and gear it keeps at least 13 cm of side clear; and both paddlers wear floats.
Scaling and variants
Longer canoes for more paddlers need a longer and thicker log, and a float on each side before any sail. Wider canoes: some Pacific Northwest builders widen a finished hull by steaming it (water heated in the hull with hot stones) and forcing thwarts in; it takes practice. Two hulls lashed side by side 1–1.5 m apart make a stable ferry for goods.