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Spencer 35 Mk I
Designer: John Brandlmayr  ·  Builder: Spencer Boats Ltd.  ·  First built: 1960
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About the Spencer 35 Mk I

Designed by Canadian naval architect C.C. Brewer and built by Spencer Boats of Vancouver, British Columbia, the Spencer 35 Mk I represents a capable and well-regarded offshore cruising sailboat that earned a loyal following along the Pacific Coast of North America. Spencer Boats developed a strong reputation throughout the 1960s and 1970s for producing rugged, seaworthy fiberglass vessels that could handle the challenging conditions of Pacific Northwest waters and beyond. The Mk I designation points to an earlier iteration of the design, reflecting the evolutionary approach Spencer took in refining their hulls over successive versions. Generally speaking, these boats were built with offshore capability in mind, offering a solid, sea-kindly hull that inspires confidence in open water passages while remaining manageable for coastal cruising. The emphasis was firmly on durability and practicality rather than racing performance, making the Spencer 35 a practical choice for bluewater-minded sailors. For anyone considering a used example today, the Spencer 35 Mk I offers an honest, go-anywhere cruiser with a proven heritage and a dedicated community of owners who continue to maintain and sail these boats with enthusiasm.

Market Price Estimate Beta
Small sample size. This estimate is based on fewer than 5 listings and may not be representative of the true market. Use with caution.
$27,000 – $27,000
typical asking price
Median $27,000  ·  1 listing used
All listings
$27,000 – $27,000 1
Rate a listing price
$
About this estimate
  • Prices are based on recent asking prices from public listings — not actual sale prices, which are typically lower.
  • Condition is not factored in. A well-maintained boat with new sails and engine can be worth significantly more than a project boat of the same model.
  • Location affects price. Boats in landlocked states or areas with fewer buyers often sell for less than those on the coast.
  • Year of manufacture is not filtered. Older examples of this model will generally be priced lower than newer ones.
  • Included equipment varies widely. A boat with a full suite of electronics, dodger, and new standing rigging may command a large premium.
  • Outliers are automatically excluded using statistical filtering to improve accuracy, but some bad data may remain.
Core Dimensions
LOA (Length Overall) 35.00 ft / 10.67 m
LWL (Waterline Length) 25.00 ft / 7.62 m
Beam 9.50 ft / 2.90 m
Max Draft 5.25 ft / 1.60 m
Displacement 12,000.00 lb / 5,443 kg
Ballast 4,200.00 lb / 1,905 kg
Design & Construction
Hull Type Long Keel
Rigging Type Masthead Sloop
Construction FG
Designer John Brandlmayr
Builder Spencer Boats Ltd.
First Built 1960
Number Built 64
Owner Reviews

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Known Issues & What to Watch For

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Performance Ratios
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
35.0
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
342.86
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. 5.09 pounds/inch
Rig Dimensions
I (Foretriangle Height) 16.39
J (Foretriangle Base) 13.25 ft / 4.04 m
P (Mainsail Luff) 535.00 ft² / 49.70 m²
E (Mainsail Foot) 342.86
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