Sly 47
Sly Yachts · Marco Lostuzzi · 2005
Updated
The Sly 47 is a 14.23 m semi-displacement racing yacht designed by Marco Lostuzzi and built by Sly Yachts, first launched in 2005. It races in Class A.
Length
14.23 m
46′ 8″
Beam
3.98 m
Draft
2.67 m
Displacement
9.5 t
Sail area
128 m²
On the podium
Where a Sly 47 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 2026, counting races with six boats or more.
Recent regattas
The latest events where a Sly 47 was on the start line, named as the organisers publish them.
151 Miglia - Trofeo Cetilar2026
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
—
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: 1 race over 10 NM carry a published distance.
Who she races against
The designs a Sly 47 actually lines up with, most often first. The bar shows how those meetings ended.
Met too few times for a figure:
Grand Soleil 43 (Maletto) (1 meeting), Grand Soleil 47 (2 meetings), Comet 45 (1 meeting), First 35 (Farr) (1 meeting), J/122 (1 meeting), Farr 40 (1 meeting), Bashford 41 (1 meeting), First 36.7 (3 meetings), Xp 44 (1 meeting), Bolt 37 (1 meeting), Italia 12.98 (Cossutti) (1 meeting), X-35 (1 meeting), J/109 (1 meeting), First 40.7 (1 meeting), X-41 (1 meeting), Pierrot 9.16 (1 meeting), Elan 310 (1 meeting), Impala 36 (1 meeting), Bonin 31 (1 meeting), Este 31 (1 meeting), X-43 (1 meeting), Hallberg Rassy 34 (1 meeting), Elan 340 (1 meeting), Dufour 34 (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
5.96
39°
Beam reach
9.95
90°
Broad reach
12.21
135°
Downwind VMG
9.59
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.
Reaching and running is where this one pays. A course with long free legs suits it better than a windward-leeward.
Where it gains
Its best ground is running deep once it pipes up, where it goes better than its measurements say it should, and by a margin worth having. It holds that advantage cracked off 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 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 0.8 kn either way.
At 10 knots this design makes back more than its rating asks on the broad reach.
How fast is a Sly 47
Boat speed in knots, by true wind angle and wind strength.
| Angle | 6 kn | 10 kn | 14 kn | 20 kn |
|---|---|---|---|---|
| Beat VMG | 4.13 | 5.49 | 5.82 | 5.96 |
| 52° | 6.32 | 8.03 | 8.38 | 8.55 |
| 60° | 6.68 | 8.33 | 8.66 | 8.85 |
| 75° | 6.95 | 8.59 | 9.04 | 9.37 |
| 90° | 6.80 | 8.59 | 9.36 | 9.95 |
| 110° | 6.88 | 8.84 | 9.59 | 10.45 |
| 120° | 6.71 | 8.89 | 9.93 | 11.09 |
| 135° | 6.07 | 8.49 | 9.83 | 12.21 |
| 150° | 5.08 | 7.54 | 9.01 | 11.07 |
| Run VMG | 4.39 | 6.53 | 7.85 | 9.59 |
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 750 kg.
Rigging
Sly 47 rig and sail dimensions
A Sly 47 carries 19.44 m of mainsail hoist on a 6.34 m boom, a forestay 19.26 m above the deck and a 7.08 m bowsprit. Typical figures across the 2 boats measured under the current VPP, with the range each one spans.
Rig
Sails
The spinnaker spreads widest of all — 182 to 215 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.