The Irwin 39 Citation is well-powered with enough sail area to move in light air, with acceptable motion comfort for coastal passages, and respectable in club racing.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 31.2′, the Irwin 39 Citation tops out around 7.5 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √31.2′ LWL = 7.5 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
PHRF Rating
132s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
SA / Displacement
18.8
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
38.5%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
249
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
27.7
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.90
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
1lbs
Weight needed to sink the hull one inch — loading sensitivity.
Motion & Offshore Suitability
Two ratios that matter most when you're planning passages — how the boat feels in a seaway, and whether the hull geometry is suitable for open ocean.
Comfort Ratio
27.7
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.90
Below the 2.0 offshore threshold — acceptable for ocean passages.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the Irwin 39 Citation sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
North American 40
90s/nm
Nordic 40
105s/nm
Irwin 39 Citation
132s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
Nautilus 40
132s/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° |
3.1 |
4.0 |
4.4 |
4.6 |
| Close Reach60° |
3.8 |
4.8 |
5.3 |
5.6 |
| Beam Reach90° |
4.6 |
5.9 |
6.6 |
6.8 |
| Broad Reach120–135° |
4.3 |
5.4 |
6.1 |
6.3 |
| Run150–180° |
3.4 |
4.3 |
4.8 |
5.1 |
These are simplified estimates based on hull speed (7.5 kts),
SA/D (18.8), 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 Irwin 39 Citation — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–6 kts
6–18 kts
18–26 kts
26+ kts
Ghosting
0–6 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
6–18 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
18–26 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
26+ 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 Irwin 39 Citation.
|
Irwin 39 Citation |
Allied 39 |
Mistress 39 Allied |
Nautilus 40 |
Nordic 40 |
North American 40 |
| Dimensions |
| LOA |
39.8 |
39.8 |
39.7 |
39.8 |
39.7 |
39.7 |
| LWL |
31.2 |
28.8 |
29.8 |
30.5 |
32.5 |
32.0 |
| Beam |
12.2 |
10.5 |
12.0 |
10.8 |
12.4 |
12.6 |
| Displacement |
16 |
17 |
20 |
19 |
18 |
17 |
| Ballast |
6 |
6 |
5 |
9 |
7 |
7 |
| Sail Area |
769 |
680 |
— |
696 |
756 |
— |
| Performance |
| PHRF |
132 |
— |
— |
132 |
105 |
90 |
| SA/Disp |
18.8 |
16.5 |
— |
15.5 |
17.7 |
— |
| Bal/Disp |
38.5 |
39.4 |
26.9 |
— |
39.4 |
45.2 |
| Comfort |
27.7 |
35.7 |
— |
37.5 |
28.0 |
— |
| Capsize |
1.90 |
1.64 |
— |
1.62 |
1.90 |
— |
| Hull Speed |
7.5 |
7.2 |
— |
7.4 |
7.6 |
— |