The Knockabout 24 Ss is 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.
5.6 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 17.3′, the Knockabout 24 Ss tops out around 5.6 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √17.3′ LWL = 5.6 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
Comfort Ratio
15.7
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
1.91
Below the 2.0 offshore threshold — acceptable for ocean passages.
Hull Speed
5.6kts
S# (Speed Number)
3.1
Pounds/Inch Immersion
385lbs
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
15.7
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
1.91
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 Knockabout 24 Ss sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Shark 24
Islander 24
Dolphin 24 Ss
Columbia 24
How It Compares
Side-by-side with the boats most often cross-shopped against the Knockabout 24 Ss.
| Knockabout 24 Ss | Columbia 24 | Dolphin 24 Ss | Islander 24 | Shark 24 | Weekender 24 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 24.2 | 24.3 | 24.2 | 24.0 | 24.0 | 24.2 |
| LWL | 17.3 | 18.0 | 19.0 | 20.0 | 20.0 | 17.3 |
| Beam | 6.3 | 8.0 | 7.7 | 7.8 | 6.8 | 6.3 |
| Displacement | 2 | 4 | 4 | 3 | 2 | 2 |
| Ballast | 1 | 1 | 1 | 1 | 675 | 1 |
| Sail Area | — | 285 | 297 | 294 | — | — |
| Performance | ||||||
| PHRF | — | 258 | 247 | 237 | 236 | — |
| SA/Disp | — | 18.0 | 18.2 | 21.3 | — | — |
| Bal/Disp | — | 44.4 | 38.8 | 51.5 | 30.7 | 54.4 |
| Comfort | 15.7 | 19.7 | 21.2 | 15.5 | — | — |
| Capsize | 1.91 | 2.01 | 1.90 | 2.11 | — | — |
| Hull Speed | 5.6 | 5.7 | 5.8 | 6.0 | — | — |