Lacustre
Lacustre · Copponex · 1938
Updated
The Lacustre is a 9.50 m displacement racing yacht designed by Copponex and built by Lacustre, first launched in 1938. It races in Class C. Across the measured fleet it goes better than its own numbers promise, ahead of 96% of the designs it races against.
Goes better than its own measurements promise, and does it better than 96% of the boats it races against.
8th of 159 in its class.
Length
9.50 m
31′ 2″
Beam
1.81 m
Draft
1.19 m
Displacement
1.7 t
Sail area
43 m²
On the podium
Where a Lacustre 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 Lacustre 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 Lacustre 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
4.22
42°
Beam reach
7.24
90°
Broad reach
9.18
135°
Downwind VMG
7.67
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.
The stronger it blows, the better this design looks. Give it a fresh day and long legs and it delivers more than it promised; in a drifter it is working uphill.
Where it gains
Its best ground is downwind in a strong breeze, where it goes better than its measurements say it should, and by a margin worth having. It holds that advantage on a broad reach as well, so the gain is not down to one leg of the course.
Where it pays
It falls short upwind when it blows, 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 1.2 kn either way.
At 10 knots this design makes back more than its rating asks on the broad reach.
How fast is a Lacustre
Boat speed in knots, by true wind angle and wind strength.
| Angle | 6 kn | 10 kn | 14 kn | 20 kn |
|---|---|---|---|---|
| Beat VMG | 3.42 | 4.06 | 4.18 | 4.22 |
| 52° | 5.15 | 5.90 | 6.05 | 6.14 |
| 60° | 5.39 | 6.10 | 6.25 | 6.36 |
| 75° | 5.55 | 6.31 | 6.54 | 6.75 |
| 90° | 5.50 | 6.43 | 6.82 | 7.24 |
| 110° | 5.37 | 6.52 | 6.97 | 7.61 |
| 120° | 5.21 | 6.56 | 7.28 | 8.14 |
| 135° | 4.64 | 6.35 | 7.34 | 9.18 |
| 150° | 3.96 | 5.84 | 6.88 | 8.79 |
| Run VMG | 3.43 | 5.09 | 6.24 | 7.67 |
How they are set up
The range each sail spans across the fleet.
Most run a fixed propeller. Crew weight is declared around 250 kg.
Rigging
Lacustre rig and sail dimensions
A Lacustre carries 10.14 m of mainsail hoist on a 3.10 m boom, a forestay 8.39 m above the deck. Typical figures across the 6 boats measured under the current VPP, with the range each one spans.
Rig
Sails