Seascape 18
ISSA · Sam Manuard · 2009
Updated
The Seascape 18 is a 5.55 m planing racing yacht designed by Sam Manuard and built by ISSA, first launched in 2009. It races in Class C.
Length
5.55 m
18′ 3″
Beam
2.38 m
Draft
1.50 m
Displacement
0.5 t
Sail area
24 m²
On the podium
Where a Seascape 18 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 Seascape 18 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 Seascape 18 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
4.40
37°
Beam reach
8.34
90°
Broad reach
12.34
135°
Downwind VMG
8.82
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 is a boat that wants breeze. 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 on a broad reach 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
It falls short upwind once the breeze fills, giving away time it never gets back.
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 4.4 kn either way.
At 10 knots it gives away time on the downwind — the rating asks more than the boat returns.
How fast is a Seascape 18
Boat speed in knots, by true wind angle and wind strength.
| Angle | 6 kn | 10 kn | 14 kn | 20 kn |
|---|---|---|---|---|
| Beat VMG | 2.98 | 3.98 | 4.28 | 4.40 |
| 52° | 4.46 | 5.63 | 6.09 | 6.37 |
| 60° | 4.65 | 5.80 | 6.41 | 6.77 |
| 75° | 4.76 | 5.97 | 6.90 | 7.50 |
| 90° | 4.89 | 6.33 | 7.16 | 8.34 |
| 110° | 4.96 | 6.59 | 8.02 | 9.79 |
| 120° | 4.80 | 6.44 | 8.30 | 11.12 |
| 135° | 4.33 | 5.99 | 7.61 | 12.34 |
| 150° | 3.71 | 5.40 | 6.62 | 10.19 |
| Run VMG | 3.21 | 4.68 | 5.73 | 8.82 |
How they are set up
The range each sail spans across the fleet.
Most run a fixed propeller. A bowsprit is standard across the fleet. Crew weight is declared around 250 kg.
Rigging
Seascape 18 rig and sail dimensions
A Seascape 18 carries 6.65 m of mainsail hoist on a 2.84 m boom, a forestay 6.67 m above the deck and a 3.70 m bowsprit. Typical figures across the 4 boats measured under the current VPP, with the range each one spans.
Rig
Sails
The spinnaker spreads widest of all — 28 to 35 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.