Back to Search
Easterly 30 Brennan
Designer: Mike Brennan  ·  Builder: Easterly Yachts (Usa)  ·  First built: 1969
+ Add to Compare
About the Easterly 30 Brennan

Designed by Mike Brennan and built by Easterly Yachts starting in 1969, this 30-footer represents solid late-1960s cruising boat philosophy with a focus on seaworthiness and comfort. The fin keel and spade rudder configuration provides responsive handling while maintaining the stability expected from a boat carrying 2,200 pounds of ballast in her 7,000-pound displacement. With a comfort ratio of 22.8, the Easterly 30 Brennan leans toward the cruising end of the spectrum, offering motion characteristics that favor extended passages over pure speed. Her conservative capsize screening formula of 1.9 indicates good stability margins for coastal and offshore work, while the masthead sloop rig with 379 square feet of sail area provides adequate power without being overwhelming for a small crew. The hull's 23-foot waterline generates a theoretical hull speed of 6.43 knots, making her well-suited for relaxed coastal cruising and weekend adventures. Her fiberglass construction and moderate draft of 4 feet opens up a good range of anchorages while still providing decent windward performance. The sail area to displacement ratio of 16.62 suggests she'll move well in moderate conditions but may need her 30-horsepower auxiliary in light air.

Core Dimensions
LOA (Length Overall) 30.08 ft / 9.17 m
LWL (Waterline Length) 23.00 ft / 7.01 m
Beam 9.08 ft / 2.77 m
Max Draft 4.00 ft / 1.22 m
Displacement 7,000.00 lb / 3,175 kg
Ballast 2,200.00 lb / 998 kg
Ballast Type Lead
Sail Area (Reported) 379.00 ft² / 35.21 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Mike Brennan
Builder Easterly Yachts (USA)
First Built 1969
Owner Reviews

No owner reviews yet — be the first to share your experience with this boat.

Known Issues & What to Watch For

No known issues documented for this model yet.

Own or have surveyed a Easterly 30 Brennan? Submit a known issue

Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 16.62
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
 31.43
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 256.84
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 22.8
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 1.9
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.43 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 2.07
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 746.21 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 16.62
Rig Dimensions
I (Foretriangle Height) 36.16 ft / 11.02 m
J (Foretriangle Base) 10.67 ft / 3.25 m
P (Mainsail Luff) 31.00 ft / 9.45 m
E (Mainsail Foot) 12.00 ft / 3.66 m
SA Fore 192.91 ft² / 17.92 m²
SA Main 186.00 ft² / 17.28 m²
SA Total (100%) 378.91 ft² / 35.20 m²
Est. Forestay Length 37.70 ft / 11.49 m
Engine & Accommodations
Engine Make Universal
Engine Model Atomic 4
Engine Type Gas w/v-drive
Horsepower 30
Fuel Capacity 15 gals / 57 L
Water Capacity 20 gals / 76 L
Find a Easterly 30 Brennan For Sale
Y YachtWorld Brokerage listings S Sailboat Listings Sailboats only C Craigslist National search F Facebook Marketplace Local listings B boats.com Global marketplace