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Performance & Speed

Island Spirit 410 Performance

How the Island Spirit 410 performs on the water — racing handicap, speed, sail-carrying power, stability and comfort.

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The Island Spirit 410 is aggressively canvassed for its weight.

Hull Speed

The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.

8.6 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length. With a waterline of 41.4′, the Island Spirit 410 tops out around 8.6 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √41.4′ LWL = 8.6 kts

Performance Ratios

Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.

SA / Displacement
24.2
Performance-oriented — carries a lot of canvas for its weight.
Displacement / Length
104
Ultralight — responsive and fast, but carries less stores.
Hull Speed
8.6kts

PHRF Fleet Position

Where the Island Spirit 410 sits on the PHRF handicap spectrum — lower numbers mean faster boats.

Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Tartan 4100 102s/nm
Catalina 400 Mk Ii 107s/nm

Estimated Speed by Wind

Rough boat speed estimates at different true wind speeds and points of sail — derived from hull speed, SA/D, and displacement, not measured polars.

Point of Sail 6 kts TWS 10 kts TWS 15 kts TWS 20 kts TWS
Close-hauled40–50° 4.0 5.1 5.7 6.0
Close Reach60° 4.9 6.2 6.9 7.2
Beam Reach90° 6.0 7.6 8.5 9.2
Broad Reach120–135° 5.6 7.0 7.8 8.5
Run150–180° 4.4 5.6 6.3 6.5
These are simplified estimates based on hull speed (8.6 kts), SA/D (24.2), and empirical efficiency curves — not instrument-measured polars. Real-world speed varies with sea state, bottom condition, sail trim, and current. Speeds in gold approach hull speed; bold gold means near or at hull speed.

Wind Range & Comfort Envelope

Estimated wind ranges for comfortable sailing on the Island Spirit 410 — based on sail area, ballast, and displacement characteristics.

Ghost
Sweet Spot
Reef
Heavy
0–5 kts 5–16 kts 16–24 kts 24+ kts
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–16 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
16–24 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
24+ kts
Storm conditions. Storm jib or bare poles. Seek shelter if coastal.

How It Compares

Side-by-side with the boats most often cross-shopped against the Island Spirit 410.

Island Spirit 410 Catalina 400 Mk Ii Oceanis 40.1 Beneteau Oceanis 41 Beneteau Oceanis 411 Beneteau Tartan 4100
Dimensions
LOA 41.4 41.5 41.3 41.7 41.3 41.3
LWL 41.4 36.5 35.8 35.8 35.1 35.8
Beam 23.0 13.5 14.1 13.8 13.5 13.5
Displacement 16 19 20 20 20 19
Ballast — 7 7 7 7 6
Sail Area 979 808 883 807 775 810
Performance
PHRF — 107 — — — 102
SA/Disp 24.2 17.8 18.6 17.2 16.8 18.3
Bal/Disp — 36.6 34.7 35.5 35.2 33.7
Comfort — 25.0 25.3 25.5 26.1 24.5
Capsize — 2.00 2.05 2.02 1.98 2.03
Hull Speed — 8.1 8.0 8.0 7.9 8.0