Ridas 31
Ridas · Dieter Blank · 2012
Updated
The Ridas 31 is a 9.29 m displacement racing yacht designed by Dieter Blank and built by Ridas, first launched in 2012. It races in Class C.
Length
9.29 m
30′ 6″
Beam
3.10 m
Draft
2.02 m
Displacement
3.7 t
Sail area
52 m²
On the podium
Where a Ridas 31 finishes when she goes racing.
On the podium
15%
of 39 starts by 3 boats
Wins
3%
Read from 39 starts by 3 boats between 2021 and 2026, counting races with six boats or more.
Recent regattas
The latest events where a Ridas 31 was on the start line, named as the organisers publish them.
Klaipėda ORC European Championship2026
Viittakari Cup2026- Garmin ORC World Championship2025
E4 Championship W/L2024- Tallinn Championship W/L2023
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
17%
of these races end on the podium
Offshore & coastal
—
Not enough data yet: 6 races over 10 NM carry a published distance.
Who she races against
The designs a Ridas 31 actually lines up with, most often first. The bar shows how those meetings ended.
Also met, too few times for a figure:
Waarschip 36 (7 meetings), Farr 40 (7 meetings), Dehler 30 OD (7 meetings), X-99 (7 meetings), First 27 (Manuard) (7 meetings), Ridas 35 (7 meetings), Melges 32 (6 meetings), Salona 38 (5 meetings), J/112 (5 meetings), Grand Surprise (5 meetings), Dufour 390 (5 meetings), Finnflyer 36 (4 meetings), J/97 (4 meetings), Italia 11.98 (4 meetings), X-37 (4 meetings), Finnflyer 34 (4 meetings), Finn Express 83 (4 meetings), Melges 24 (4 meetings)
Some of the boats it races against
How the Ridas 31 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
4.94
39°
Beam reach
7.99
90°
Broad reach
9.13
135°
Downwind VMG
7.63
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.
This design is even-tempered. It rewards preparation and crew work more than it rewards picking the right day.
Where it gains
Its best ground is cracked off in a strong breeze, where it goes better than its measurements say it should, and by a margin worth having. It holds that advantage running deep as well, so the gain is not down to one leg of the course.
Where it pays
There is no condition where it falls away badly, which is worth something over a season of mixed weather.
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 Ridas 31
Boat speed in knots, by true wind angle and wind strength.
| Angle | 6 kn | 10 kn | 14 kn | 20 kn |
|---|---|---|---|---|
| Beat VMG | 3.31 | 4.51 | 4.86 | 4.94 |
| 52° | 5.02 | 6.47 | 6.85 | 6.98 |
| 60° | 5.28 | 6.64 | 7.05 | 7.22 |
| 75° | 5.45 | 6.78 | 7.28 | 7.64 |
| 90° | 5.39 | 6.91 | 7.44 | 7.99 |
| 110° | 5.42 | 7.04 | 7.79 | 8.44 |
| 120° | 5.23 | 6.95 | 7.82 | 8.95 |
| 135° | 4.66 | 6.62 | 7.56 | 9.13 |
| 150° | 3.91 | 5.99 | 7.11 | 8.26 |
| Run VMG | 3.38 | 5.20 | 6.46 | 7.63 |
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 450 kg.
Rigging
Ridas 31 rig and sail dimensions
A Ridas 31 carries 11.85 m of mainsail hoist on a 4.30 m boom, a forestay 11.50 m above the deck and a 4.49 m bowsprit. Typical figures across the 3 boats measured under the current VPP, with the range each one spans.
Rig
Sails
The spinnaker spreads widest of all — 56 to 65 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.