The Mac Dinghy 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.
3.9 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
Displacement / Length
64
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
2.3
Quick, snappy motion — better for day sails and racing than long passages.
Hull Speed
3.9kts
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
2.3
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
How It Compares
Side-by-side with the boats most often cross-shopped against the Mac Dinghy.
| Mac Dinghy | Cape Dory 10 | Dyer Dink | Heron | Mirror Dinghy Int | Topper | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 10.0 | 10.5 | 10.0 | 11.3 | 10.8 | 11.2 |
| LWL | — | 10.0 | — | — | — | — |
| Beam | 4.1 | 4.1 | 4.5 | 4.5 | 4.6 | 3.9 |
| Displacement | 88 | 150 | 135 | 140 | 135 | 99 |
| Sail Area | — | 68 | 66 | 70 | 69 | — |
| Performance | ||||||
| SA/Disp | — | 38.6 | — | 41.6 | — | — |
| Comfort | 2.3 | 3.5 | 3.1 | 2.9 | 2.8 | 2.5 |
| Capsize | — | 3.07 | — | — | — | — |
| Hull Speed | 3.9 | 4.2 | 3.9 | 4.1 | 4.1 | 4.1 |