The Luth is aggressively canvassed for its weight, with a quick, snappy motion best suited to day sailing.
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 19.1′, the Luth tops out around 5.9 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √19.1′ LWL = 5.9 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
24.3
Performance-oriented — carries a lot of canvas for its weight.
Comfort Ratio
14.6
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.30
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
610lbs
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
14.6
Quick, snappy motion — better for day sails and racing than long passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
2.30
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the Luth sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Edel 820
195s/nm
Cs 27
204s/nm
Pearson 27
204s/nm
Catalina 27
207s/nm
Tartan 27
234s/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° |
2.8 |
3.5 |
3.9 |
4.1 |
| Close Reach60° |
3.3 |
4.2 |
4.7 |
4.9 |
| Beam Reach90° |
4.1 |
5.2 |
5.8 |
5.9 |
| Broad Reach120–135° |
3.8 |
4.8 |
5.3 |
5.6 |
| Run150–180° |
3.0 |
3.8 |
4.3 |
4.5 |
These are simplified estimates based on hull speed (5.9 kts),
SA/D (24.3), 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 Luth — 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 Luth.
|
Luth |
Catalina 27 |
Cs 27 |
Edel 820 |
Pearson 27 |
Tartan 27 |
| Dimensions |
| LOA |
26.9 |
26.9 |
27.0 |
26.9 |
26.9 |
27.0 |
| LWL |
19.1 |
23.0 |
23.9 |
22.5 |
22.5 |
21.4 |
| Beam |
8.9 |
9.2 |
9.3 |
9.7 |
9.2 |
8.6 |
| Displacement |
3 |
6 |
6 |
7 |
5 |
7 |
| Ballast |
1 |
2 |
2 |
2 |
2 |
2 |
| Sail Area |
366 |
323 |
453 |
386 |
332 |
— |
| Performance |
| PHRF |
— |
207 |
204 |
195 |
204 |
234 |
| SA/Disp |
24.3 |
14.3 |
21.8 |
16.9 |
16.5 |
— |
| Bal/Disp |
— |
39.4 |
39.3 |
37.5 |
— |
32.4 |
| Comfort |
14.6 |
25.0 |
19.4 |
22.3 |
19.7 |
— |
| Capsize |
2.30 |
1.86 |
2.05 |
2.02 |
2.04 |
— |
| Hull Speed |
5.9 |
6.3 |
6.6 |
6.4 |
6.4 |
— |