The Friendship 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 18.5′, the Friendship 21 tops out around 5.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √18.5′ 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
21.7
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Displacement / Length
153
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
10.4
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.53
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
543lbs
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
10.4
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
2.53
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 Friendship 21 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser 150–210
Heavy Cruiser 210–300
Merit 22
213s/nm
Cal 22
246s/nm
Starwind 22
273s/nm
Seaward 22
287s/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° |
2.6 |
3.3 |
3.7 |
3.8 |
| Close Reach60° |
3.1 |
4.0 |
4.4 |
4.6 |
| Beam Reach90° |
3.9 |
4.9 |
5.5 |
5.9 |
| Broad Reach120–135° |
3.6 |
4.5 |
5.0 |
5.5 |
| Run150–180° |
2.9 |
3.6 |
4.0 |
4.2 |
These are simplified estimates based on hull speed (5.8 kts),
SA/D (21.7), 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 Friendship 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 Friendship 21.
|
Friendship 21 |
Cal 22 |
Merit 22 |
S2 69 |
Seaward 22 |
Starwind 22 |
| Dimensions |
| LOA |
22.1 |
22.0 |
22.0 |
22.0 |
22.0 |
22.0 |
| LWL |
18.5 |
19.5 |
18.0 |
18.8 |
20.6 |
19.0 |
| Beam |
8.2 |
7.8 |
8.0 |
8.0 |
8.3 |
7.8 |
| Displacement |
2 |
2 |
2 |
2 |
2 |
2 |
| Ballast |
— |
775 |
600 |
770 |
750 |
775 |
| Sail Area |
227 |
223 |
227 |
228 |
— |
— |
| Performance |
| PHRF |
— |
246 |
213 |
— |
287 |
273 |
| SA/Disp |
21.7 |
21.8 |
22.9 |
21.6 |
— |
— |
| Bal/Disp |
— |
36.9 |
— |
35.0 |
34.1 |
29.8 |
| Comfort |
10.4 |
10.5 |
10.1 |
10.8 |
— |
— |
| Capsize |
2.53 |
2.42 |
2.54 |
2.46 |
— |
— |
| Hull Speed |
5.8 |
5.9 |
5.7 |
5.8 |
— |
— |