Dubois 50
Dubois · Ed Dubois · 2015
Updated
The Dubois 50 is a 14.99 m semi-displacement racing yacht designed by Ed Dubois and built by Dubois, first launched in 2015. It races in Class 0. Across the measured fleet it goes better than its own numbers promise, ahead of 30% of the designs it races against. It is at its best in light air and struggles to hold that once it blows.
Goes better than its own measurements promise, and does it better than 30% of the boats it races against.
8th of 11 in its class.
Updated — Figure recalculated as other designs in its class moved.
Length
14.99 m
49′ 2″
Beam
4.36 m
Draft
3.30 m
Displacement
13.3 t
Sail area
150 m²
On the podium
Where a Dubois 50 finishes when she goes racing.
Not enough data yet to show how this design finishes. It has not been found in the race results we have collected so far.
Recent regattas
The latest events where a Dubois 50 was on the start line, named as the organisers publish them.
No regattas found yet.
Raced one we are missing?
Report a regattaRound the buoys, or offshore
A short windward-leeward and a night at sea ask different things of a boat. Here is how this one does in each.
Round the buoys
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Not enough data yet: no races of 10 NM or less carry a published distance.
Offshore & coastal
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Not enough data yet: no races over 10 NM carry a published distance.
Who she races against
The designs a Dubois 50 actually lines up with, most often first. The bar shows how those meetings ended.
Not enough data yet to say who this design races against. No result we have collected puts it on the water beside another design we track.
Speed at every angle
The shape of this design's speed, drawn from the measured fleet. Pick a wind and watch it stretch.
Upwind VMG
6.69
36°
Beam reach
10.38
90°
Broad reach
11.97
135°
Downwind VMG
9.68
170°
Speed in knots at 20 knots of true wind. Green marks the angles that pay: the closest useful beat and the deepest run worth sailing.
Where it wins and where it pays
Every boat is judged against its own measurements — length, weight, sail area. The quicker those say it should be, the more it has to deliver just to break even. Going fast is not enough: it has to go faster than its own numbers promised.
Soft conditions suit it. Early-season racing and morning breezes play to its strengths; once it pipes up the fleet comes back to it.
Where it gains
Its best ground is to windward in a strong breeze, where it outruns what it looks like on paper, and by a margin worth having.
Where it pays
It falls short downwind when it blows, giving away time it never gets back. That is a hull that will lift and run given enough breeze.
Above the line it delivers more than promised and gains on the fleet. Below, it falls short. Move the wind: plenty of boats sit on one side in the light and the other when it blows.
Full width is 0.6 kn either way.
At 10 knots this design makes back more than its rating asks on the upwind.
How fast is a Dubois 50
Boat speed in knots, by true wind angle and wind strength.
| Angle | 6 kn | 10 kn | 14 kn | 20 kn |
|---|---|---|---|---|
| Beat VMG | 4.38 | 5.87 | 6.38 | 6.69 |
| 52° | 6.62 | 8.39 | 8.86 | 9.14 |
| 60° | 6.96 | 8.62 | 9.10 | 9.42 |
| 75° | 7.20 | 8.80 | 9.40 | 9.91 |
| 90° | 7.05 | 8.80 | 9.54 | 10.38 |
| 110° | 7.03 | 9.08 | 9.90 | 10.79 |
| 120° | 6.86 | 9.05 | 10.16 | 11.35 |
| 135° | 6.14 | 8.65 | 9.86 | 11.97 |
| 150° | 5.15 | 7.64 | 9.13 | 10.89 |
| Run VMG | 4.46 | 6.61 | 8.08 | 9.68 |
How they are set up
The range each sail spans across the fleet.
Nearly all carry a folding propeller. A bowsprit is standard across the fleet. Crew weight is declared around 1190 kg.
Rigging
Dubois 50 rig and sail dimensions
A Dubois 50 carries 20.14 m of mainsail hoist on a 6.62 m boom, a forestay 19.65 m above the deck and a 6.01 m bowsprit. Typical figures across the 6 boats measured under the current VPP, with the range each one spans.
Rig
Sails