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 Oday 20 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.
PHRF Rating
280s/nm
Heavy or slow cruiser — all about the journey, not the elapsed time.
Ballast / Displacement
17.0%
Light ballast — tends to be tender; reef earlier than the numbers suggest.
Displacement / Length
204
Moderate — a good balance of speed and load-carrying ability.
Hull Speed
5.6kts
Pounds/Inch Immersion
3lbs
Weight needed to sink the hull one inch — loading sensitivity.
PHRF Fleet Position
Where the Oday 20 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Oday 20
Heavy or slow cruiser — all about the journey, not the elapsed time.
Hunter 20
Montego 19
How It Compares
Side-by-side with the boats most often cross-shopped against the Oday 20.
| Oday 20 | Corinthian 19 Alberg | Hunter 20 | Montego 19 | Nordica 20 | Rhodes 19 Cb | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 19.6 | 19.5 | 19.8 | 19.5 | 19.5 | 19.2 |
| LWL | 17.3 | 14.5 | 17.5 | 17.8 | 16.5 | 17.8 |
| Beam | 7.0 | 6.5 | 7.8 | 7.2 | 7.7 | 7.0 |
| Displacement | 2 | 2 | 2 | 1 | 2 | 1 |
| Ballast | 400 | 1 | 750 | — | 1 | 165 |
| Sail Area | — | 193 | 175 | 167 | 188 | 175 |
| Performance | ||||||
| PHRF | 280 | — | 285 | 288 | — | — |
| SA/Disp | — | 15.9 | 17.6 | 20.0 | 16.3 | 27.5 |
| Bal/Disp | 17.0 | 40.4 | 37.5 | — | — | — |
| Comfort | — | 21.7 | 11.1 | 9.5 | 14.8 | 6.6 |
| Capsize | — | 1.86 | 2.46 | 2.48 | 2.26 | 2.78 |
| Hull Speed | — | 5.1 | 5.6 | 5.7 | 5.4 | 5.7 |