Medusa 25 Information, Review, Specs

Make
Medusa
Model
25
Builder
F1 Glass Dev. Ltd.
Designer
Marice Griffiths
Number Built
Production Year(s)
1960 - ??

The Medusa 25 is a robust, British-built coastal cruiser that emerged during the "golden era" of GRP production in the late 1970s. Designed by the prolific David Feltham—widely known for his work on the Cobra and Seawolf ranges—the Medusa 25 was built by Medusa Marine in Suffolk. It was conceived as a stiff, seaworthy alternative to the lighter, more flighty cruisers of the time, targeting sailors who prioritized safety and interior volume over raw racing speed. While production numbers were more modest than its Cobra counterparts, the Medusa 25 remains a respected sight in European waters, particularly favored by those navigating the tidal estuaries of the United Kingdom.

Sailing Performance & Handling

The Medusa 25 is characterized by a high displacement-to-length ratio, which translates to a steady, predictable motion in a seaway. Unlike modern flat-bottomed yachts that may "slam" into head seas, the Medusa's traditional hull form and substantial ballast ratio allow it to punch through chop with minimal loss of momentum. Most models were produced with twin bilge keels, a design choice driven by the demand for "drying" moorings in tidal regions. While the bilge keel configuration limits pointing ability compared to the rarer fin keel variant, it provides a stable platform for coastal exploration.

In terms of sail area-to-displacement, the Medusa 25 is conservatively rigged. It requires a decent breeze—typically Force 3 or 4—to truly come alive. Owners often note that the boat feels "stiff," meaning it resists heeling even when overpressed, a quality that makes it an excellent starter boat for nervous crews or families. The tracking is generally reported as reliable, though the boat's heavy displacement means it can be sluggish in very light airs. Technical insights from historical reviews in Practical Boat Owner suggest that the boat's rudder is well-balanced, though the helm can become heavy if the genoa is not reefed early.

Interior Comfort & Variations

For a 25-foot vessel, the Medusa 25 offers a surprising amount of internal volume, a hallmark of David Feltham’s design philosophy. The layout typically accommodates four to five berths, featuring a double V-berth in the forward cabin and a convertible dinette in the main saloon. The headroom is notable for a boat of this length, often exceeding 5'10", which prevents the "cave-like" feel found in many of its contemporaries.

The galley is usually positioned to starboard, equipped with a two-burner stove and a small sink, while a dedicated heads compartment is situated between the saloon and the forward cabin—a luxury in the 25-foot class. Materials used in the interior are generally functional, utilizing thick teak or mahogany veneers and molded GRP headliners that are easy to maintain. While there are no major production variations in terms of the hull (aside from the keel options), some owners have modified the quarter berths to accommodate larger navigation stations. The Medusa 25’s larger sibling, the Medusa 31, shares many of these aesthetic cues but offers significantly more beam and storage capacity.

Known Issues & Buyer’s Checklist

Prospective buyers of a Medusa 25 should focus on the typical stressors associated with 40-year-old GRP hulls. While the lay-up is notoriously thick, osmosis is a common finding in hulls of this era that have not been treated with an epoxy barrier coat.

  • Deck Core Integrity: Check for "spongy" areas on the side decks and coachroof. Like many boats of this period, the Medusa 25 uses a balsa or plywood core in certain areas which can rot if deck hardware (stanchions, cleats) has not been periodically re-bedded.
  • Keel-to-Hull Joint: On bilge keel models, the stresses of drying out on hard sand or mud over decades can lead to "weeping" at the keel joint. Inspect the internal floors and stringers for stress cracks or evidence of movement.
  • Engine Serviceability: Many Medusas were originally fitted with the Yanmar 1GM10 or Bukh engines. While reliable, these original units may be approaching the end of their service life. Check for excessive smoke or signs of salt-water cooling blockages.
  • Chainplates: The rigging loads on the Medusa are significant given its stiffness. Inspect the chainplate attachments under the deck for signs of water ingress or rust staining, which can indicate structural fatigue.

Community & Resources

Owners of the Medusa 25 often find technical support and social connection through the Cobra and Seawolf Owners Association. Although the Medusa was built by a different yard, the shared design heritage of David Feltham means that many structural components, rigging specs, and sailing characteristics are nearly identical to the Cobra 25. This association serves as the primary technical wiki for the model, offering advice on everything from rudder replacement to window resealing.

The Verdict

The Medusa 25 is a quintessential "pocket cruiser" that sacrifices high-speed performance for safety, comfort, and durability. It is an ideal vessel for coastal hopping and is particularly well-suited to regions with significant tidal ranges.

Pros:

  • Exceptional stability and "big boat" feel in rough weather.
  • Generous interior headroom and volume for a 25-footer.
  • Sturdy construction capable of withstanding years of use.

Cons:

  • Limited light-wind performance due to high displacement.
  • Bilge keel models lack the weatherly performance of more modern fin-keelers.
  • Requires vigilant inspection for osmosis and deck core rot due to age.

Measurements

Construction & Hull

Construction Material
Fiberglass/Wood Composite
Hull Type
Monohull Sailboat
Keel Type
Twin
Rudder
1x —
Ballast
-
Displacement
4704 lbs
Water Capacity
-
Fuel Capacity
-

Dimensions

Length Overall (LOA)
24.5 ft
Waterline Length (LWL)
18.75 ft
Beam
8 ft
Draft
2.5 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Masthead Sloop
P (Main Luff)
-
E (Main Foot)
-
I (Foretriangle Height)
-
J (Foretriangle Base)
-
Forestay Length (est)
-
Sail Area
256 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
14.59
Ballast / Displacement Ratio
Displacement / Length Ratio (D/L) Ratio
318.58
Comfort Ratio
22.24
Capsize Screening Formula
1.91
Hull Speed
5.8 kn