The Alpa 21 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 18.6′, the Alpa 21 tops out around 5.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √18.6′ LWL = 5.8 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
19.5
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Comfort Ratio
14.0
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
542lbs
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
14.0
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 Alpa 21 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Us 21
201s/nm
Morgan 22
243s/nm
Santana 21
264s/nm
Aquarius 21
267s/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° |
2.5 |
3.1 |
3.5 |
3.6 |
| Close Reach60° |
3.0 |
3.8 |
4.2 |
4.4 |
| Beam Reach90° |
3.7 |
4.6 |
5.2 |
5.4 |
| Broad Reach120–135° |
3.4 |
4.3 |
4.8 |
5.0 |
| Run150–180° |
2.7 |
3.4 |
3.8 |
4.0 |
These are simplified estimates based on hull speed (5.8 kts),
SA/D (19.5), 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 Alpa 21 — 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 Alpa 21.
|
Alpa 21 |
Aquarius 21 |
Morgan 22 |
Newport 212 |
Santana 21 |
Us 21 |
| Dimensions |
| LOA |
21.3 |
21.0 |
21.4 |
21.2 |
21.3 |
21.3 |
| LWL |
18.6 |
18.3 |
20.3 |
19.1 |
19.3 |
18.0 |
| Beam |
8.2 |
7.8 |
8.0 |
7.7 |
7.5 |
8.0 |
| Displacement |
2 |
1 |
2 |
1 |
1 |
1 |
| Ballast |
800 |
665 |
1 |
400 |
550 |
200 |
| Sail Area |
245 |
163 |
— |
— |
189 |
220 |
| Performance |
| PHRF |
— |
267 |
243 |
— |
264 |
201 |
| SA/Disp |
19.5 |
17.0 |
— |
— |
21.3 |
24.8 |
| Bal/Disp |
— |
35.0 |
51.9 |
26.7 |
32.4 |
— |
| Comfort |
14.0 |
9.9 |
— |
— |
9.0 |
8.7 |
| Capsize |
2.30 |
2.53 |
— |
— |
2.52 |
2.68 |
| Hull Speed |
5.8 |
5.7 |
— |
— |
5.9 |
5.7 |