The Seidelmann 245 is well-powered with enough sail area to move in light air, 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 20.5′, the Seidelmann 245 tops out around 6.1 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √20.5′ LWL = 6.1 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
216s/nm
Heavy or slow cruiser — all about the journey, not the elapsed time.
SA / Displacement
20.6
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Comfort Ratio
13.5
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.22
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
586lbs
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
13.5
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
2.22
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 Seidelmann 245 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser 150–210
Heavy Cruiser 210–300
Seidelmann 24
213s/nm
Seidelmann 245
216s/nm
Heavy or slow cruiser — all about the journey, not the elapsed time.
Captiva 240
222s/nm
Hunter 240
228s/nm
Shark 24
236s/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° |
2.7 |
3.4 |
3.8 |
3.9 |
| Close Reach60° |
3.2 |
4.1 |
4.6 |
4.7 |
| Beam Reach90° |
4.0 |
5.0 |
5.6 |
5.8 |
| Broad Reach120–135° |
3.7 |
4.6 |
5.2 |
5.4 |
| Run150–180° |
2.9 |
3.7 |
4.1 |
4.3 |
These are simplified estimates based on hull speed (6.1 kts),
SA/D (20.6), 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 Seidelmann 245 — 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 Seidelmann 245.
|
Seidelmann 245 |
Captiva 240 |
Hunter 240 |
Martin 242 |
Seidelmann 24 |
Shark 24 |
| Dimensions |
| LOA |
24.2 |
24.0 |
24.1 |
24.2 |
24.2 |
24.0 |
| LWL |
20.5 |
20.5 |
22.1 |
19.3 |
20.5 |
20.0 |
| Beam |
8.0 |
8.2 |
8.3 |
8.0 |
8.0 |
6.8 |
| Displacement |
3 |
2 |
3 |
2 |
3 |
2 |
| Ballast |
1 |
1 |
1 |
930 |
1 |
675 |
| Sail Area |
267 |
280 |
236 |
— |
267 |
— |
| Performance |
| PHRF |
216 |
222 |
228 |
— |
213 |
236 |
| SA/Disp |
20.6 |
25.1 |
16.1 |
— |
20.6 |
— |
| Bal/Disp |
— |
41.7 |
36.1 |
37.2 |
36.7 |
30.7 |
| Comfort |
13.5 |
10.5 |
14.8 |
— |
13.5 |
— |
| Capsize |
2.22 |
2.44 |
2.16 |
— |
2.22 |
— |
| Hull Speed |
6.1 |
6.1 |
6.3 |
— |
6.1 |
— |