Dehler 31
Dehler · E.G. van de Stadt · 1982
Updated
The Dehler 31 is a 9.43 m heavy displacement racing yacht designed by E.G. van de Stadt and built by Dehler, first launched in 1982. It races in Class C.
Length
9.43 m
30′ 11″
Beam
3.10 m
Draft
1.51 m
Displacement
3.9 t
Sail area
49 m²
On the podium
Where a Dehler 31 finishes when she goes racing.
0
Wins
0
Seconds
0
Thirds
1
Starts
Not enough races yet for a percentage — these are the counts so far. We keep collecting results, so this will fill in.
Read from 1 start by 1 boat between 2019, counting races with six boats or more.
Recent regattas
The latest events where a Dehler 31 was on the start line, named as the organisers publish them.
50 Mijl Doublehanded2019
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 Dehler 31 actually lines up with, most often first. The bar shows how those meetings ended.
Met too few times for a figure:
X-312 (1 meeting), Pogo 850 (1 meeting), Waarschip 101 (1 meeting), X-362 (1 meeting), Stadt 34 (1 meeting), First 31.7 (1 meeting), Spirit 32 (1 meeting), Winner 950 (2 meetings), Varianta 37 (1 meeting), X-34 (1 meeting), Dehler 34 (Judel/Vrolijk) (1 meeting), UFO 34 (1 meeting), Comfortina 38 (1 meeting), Brise De Mer 34 (1 meeting), J/92 (2 meetings), F & F 95 (1 meeting), X-372 (1 meeting), Seascape 24 (1 meeting), X-99 (1 meeting)
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
4.44
40°
Beam reach
7.25
90°
Broad reach
8.11
135°
Downwind VMG
7.00
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.
It does most things without giving much away. It rewards preparation and crew work more than it rewards picking the right day.
Where it gains
Its best ground is on a reach in the light stuff, where it goes better than its measurements say it should. It holds that advantage off the wind as well, so the gain is not down to one leg of the course.
Where it pays
It falls short on a broad reach when it blows, giving away time it never gets back. That is weight that has to be driven rather than released.
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 0.4 kn either way.
At 10 knots this design makes back more than its rating asks on the beam reach.
How fast is a Dehler 31
Boat speed in knots, by true wind angle and wind strength.
| Angle | 6 kn | 10 kn | 14 kn | 20 kn |
|---|---|---|---|---|
| Beat VMG | 2.94 | 4.02 | 4.42 | 4.44 |
| 52° | 4.54 | 5.91 | 6.32 | 6.41 |
| 60° | 4.81 | 6.10 | 6.50 | 6.62 |
| 75° | 4.98 | 6.26 | 6.70 | 6.94 |
| 90° | 4.99 | 6.43 | 6.87 | 7.25 |
| 110° | 5.08 | 6.52 | 7.10 | 7.91 |
| 120° | 4.91 | 6.46 | 7.13 | 8.07 |
| 135° | 4.42 | 6.20 | 6.98 | 8.11 |
| 150° | 3.76 | 5.64 | 6.60 | 7.52 |
| Run VMG | 3.26 | 4.89 | 6.05 | 7.00 |
How they are set up
The range each sail spans across the fleet.
Nearly all carry a folding propeller. Crew weight is declared around 400 kg.
Rigging
Dehler 31 rig and sail dimensions
A Dehler 31 carries 11.15 m of mainsail hoist on a 4.07 m boom, a forestay 10.58 m above the deck. Typical figures across the 5 boats measured under the current VPP, with the range each one spans.
Rig
Sails