What is the Castle 650's sail area to displacement ratio?

The Castle 650 has a Sail Area to Displacement ratio (SA/D) of 27.13. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

Is the Castle 650 safe for offshore sailing?

The Castle 650 has a Capsize Screening Formula value of 2.67. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

How much does a Castle 650 weigh?

The Castle 650 has a displacement of 1,689.00 lb and a length overall (LOA) of 21.52 ft.

Who designed the Castle 650?

The Castle 650 was designed by Steven Douglas, first built in 1980.

Castle 650 Performance — PHRF, SA/D, Hull Speed & Sailing Characteristics

The Castle 650 is aggressively canvassed for its weight.

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

27.1

Performance-oriented — carries a lot of canvas for its weight.

Ballast / Displacement

32.6%

Typical cruising ballast — balanced stability and motion underway.

Capsize Screening

2.67

Above the 2.0 offshore threshold — best suited for coastal and protected waters.

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.

Capsize Screening Formula

2.67

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 Castle 650 sits on the PHRF handicap spectrum — lower numbers mean faster boats.

Cruiser 150–210

Heavy Cruiser 210–300

Laguna 22 240s/nm

Cs 22 249s/nm

Hunter 22 252s/nm

Catalina 22 Mkii 270s/nm

Wind Range & Comfort Envelope

Estimated wind ranges for comfortable sailing on the Castle 650 — based on sail area, ballast, and displacement characteristics.

Ghost

Sweet Spot

Reef

Heavy

0–5 kts 5–16 kts 16–24 kts 24+ kts

Ghosting

0–5 kts

Light air, motor-sailing likely. Need patience and a light genoa.

Sweet Spot

5–16 kts

Comfortable under full sail. Best speed-to-comfort ratio.

Time to Reef

16–24 kts

Time to shorten sail. Reef the main, swap to a working jib.

Heavy Weather

24+ 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 Castle 650.

	Castle 650	Catalina 22 Mkii	Chrysler 22 Fk	Cs 22	Hunter 22	Laguna 22
Dimensions
LOA	21.5	21.5	21.6	21.6	21.5	21.6
LWL	—	19.5	19.0	17.5	18.5	19.0
Beam	7.9	8.0	7.8	8.0	8.0	8.0
Displacement	1	2	3	2	2	2
Ballast	551	870	725	1	1	900
Sail Area	240	212	—	194	213	206
Performance
PHRF	—	270	—	249	252	240
SA/Disp	27.1	18.4	—	18.4	17.8	19.1
Bal/Disp	32.6	34.9	24.2	50.0	37.7	39.5
Comfort	—	12.4	15.3	11.4	13.1	11.2
Capsize	2.67	2.26	2.15	2.46	2.32	2.43
Hull Speed	—	5.9	5.8	5.6	5.8	5.8