X-37
X-Yachts · Niels Jeppesen · 2004
Updated
The X-37 is a 11.35 m displacement racing yacht designed by Niels Jeppesen and built by X-Yachts, first launched in 2004. It races in Class C. Across the measured fleet it goes better than its own numbers promise, ahead of 63% 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 63% of the boats it races against.
60th of 159 in its class.
This design has been found in real race results — 102 starts across 17 events — not only in measurement files.
Length
11.35 m
37′ 3″
Beam
3.47 m
Draft
2.05 m
Displacement
6.7 t
Sail area
82 m²
On the podium
Where a X-37 finishes when she goes racing.
On the podium
16%
of 102 starts by 11 boats
Wins
5%
Read from 102 starts by 11 boats between 2017 and 2026, counting races with six boats or more.
Recent regattas
The latest events where a X-37 was on the start line, named as the organisers publish them.
Edison Next Italian Offshore Sailing Championship - Campionato Italiano Assoluto d’Altura2026- ORC World Championship2026
- XXX Trofeo Punta Stendardo2026
Isbjørnen2026- Bundefjorden Onsdagsseilaser2026
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
6%
of these races end on the podium
Offshore & coastal
—
Not enough data yet: 8 races over 10 NM carry a published distance.
Who she races against
The designs a X-37 actually lines up with, most often first. The bar shows how those meetings ended.
Some of the boats it races against
How the X-37 has fared against each of them, boat against boat on corrected time. Ordered by how often the two meet, not by who wins.
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
5.26
39°
Beam reach
8.42
90°
Broad reach
9.30
135°
Downwind VMG
8.07
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 running deep in a working breeze, where it outruns what it looks like on paper. It holds that advantage upwind as well, so the gain is not down to one leg of the course.
Where it pays
It falls short off the wind in a strong breeze, giving away time it never gets back. That is a displacement hull working to its designed speed.
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 upwind.
How fast is a X-37
Boat speed in knots, by true wind angle and wind strength.
| Angle | 6 kn | 10 kn | 14 kn | 20 kn |
|---|---|---|---|---|
| Beat VMG | 3.60 | 4.84 | 5.16 | 5.26 |
| 52° | 5.49 | 7.00 | 7.32 | 7.46 |
| 60° | 5.78 | 7.20 | 7.53 | 7.69 |
| 75° | 5.98 | 7.35 | 7.80 | 8.06 |
| 90° | 5.88 | 7.37 | 7.93 | 8.42 |
| 110° | 5.79 | 7.51 | 8.19 | 8.75 |
| 120° | 5.61 | 7.42 | 8.23 | 9.12 |
| 135° | 5.01 | 7.07 | 7.99 | 9.30 |
| 150° | 4.23 | 6.39 | 7.60 | 8.80 |
| Run VMG | 3.66 | 5.55 | 6.88 | 8.07 |
How they are set up
The range each sail spans across the fleet.
Nearly all carry a folding propeller. Crew weight is declared around 690 kg.
Rigging
X-37 rig and sail dimensions
A X-37 carries 14.76 m of mainsail hoist on a 5.09 m boom, a forestay 15.50 m above the deck and a 4.43 m bowsprit. Typical figures across the 25 boats measured under the current VPP, with the range each one spans.
Rig
Sails
The spinnaker spreads widest of all — 78 to 139 m² depending on bowsprit and set-up. Before ordering a sail, read the figure on your own measurement record rather than the typical one for the design.