Finesse 21 — Information, Review, Specs

Alan Platt / Laurie Harbotell·1968·A F Platt Ltd.
Approximate drawing

Hover a measurement to read its value

Hull type
Monohull · centerboard
Rig
Fractional Sloop
LOA
21' · 6.4 m
Displ.
3,500 lbs · 1,588 kg
First year
1968

The Finesse 21 is a quintessential English "creek crawler," a traditionally styled pocket cruiser designed and originally built by Alan Platt at LeighonSea. First appearing in the early 1960s, these vessels were birthed from the demands of the Thames Estuary—a landscape defined by shifting sands, drying harbors, and shallow, tidal guts. Constructed primarily using clinker (lapstrake) methods, the Finesse 21 was built to be a robust, characterful alternative to the emerging fiberglass massproduction boats of its era. While Alan Platt’s yard produced various custom iterations, the 21 remained the bedrock of the range until the introduction of its larger sibling, the Finesse 24. According to The Finesse Owners Association, the design emphasizes a balance between traditional aesthetics and practical coastal cruising, often featuring a signature "raked" transom and a highvolume hull that belies its modest 21foot length.

Measurements

Dimensions 01

LOA
21 ft
LWL
18.25 ft
Beam
7.5 ft
Draft
6 ft
Max headroom
-
Air draft
-

Construction & hull 02

Construction
Wood
Hull type
Monohull
Keel type
Centerboard
Rudder
1× —
Ballast
850 lbs (Iron)
Displacement
3500 lbs
Water
-
Fuel
-

Rig & sails 03

Rig type
Fractional Sloop
P · main luff
-
E · main foot
-
I · fore ht.
-
J · fore base
-
Forestay (est)
-
Sail area
180 sqft

Calculations 04

SA/D ratio
12.49
Ballast/Disp.
24.29
D/L ratio
257.06
Comfort ratio
19.36
Capsize screening
1.98
Hull speed
5.72 kn

Sailing Performance & Handling

The Finesse 21 is characterized by a "sea-kindly" motion that stems from its relatively heavy displacement and traditional clinker hull form. Unlike modern fin-keeled boats that pivot sharply, the 21 tracks with a reassuring steadiness. Most models utilize a shallow-draft configuration featuring a small stub keel supplemented by a heavy steel centerboard, though a few twin-keel variants exist. This allows the boat to access extremely shallow anchorages or settle upright on a drying mud berth—a core requirement for East Coast sailing.

Under sail, the boat is generally rigged as a Bermudan sloop, though some owners have retrofitted gaff rigs to match the traditional hull. It is not a high-performance racing machine; its wide beam and clinker lands create a fair amount of drag. However, it is noted for being surprisingly stiff under canvas. Technical discussions within the sailing community suggest that the boat feels most at home in a Force 3 to 5, where the weight helps it punch through a short chop that would stop lighter dinghy-hybrids. Handling is predictable, though the large barn-door rudder can require some muscle when the boat is pressed hard or running downwind in a swell.

Interior Comfort & Variations

For a 21-foot vessel, the Finesse offers an impressive amount of internal volume, largely due to its high topsides and generous beam. The layout typically features a classic "V-berth" in the bow, a small central saloon with two settee berths, and a compact galley area. Because these boats were often built to order or finished by owners, interior fit-outs can vary wildly. High-quality mahogany or iroko joinery is common, creating a warm, traditional atmosphere that is increasingly rare in modern yachting.

The headroom is notable for a pocket cruiser, often allowing an average-sized adult to sit upright comfortably—and in some custom versions, nearly stand—near the companionway. The transition from the 21 to the larger Finesse 24 offered more dedicated "living" zones, including an enclosed head (toilet), which is often just a "bucket-and-chuck-it" or a chemical toilet tucked under a berth on the 21. Potential buyers should look for the "Companion" variant, which occasionally appears with slight modifications to the coachroof profile to increase interior light.

Known Issues & Buyer’s Checklist

As a wooden vessel, the Finesse 21 requires a vigilant maintenance schedule that differs significantly from GRP (fiberglass) boats. Prospective owners must conduct a thorough survey focusing on the following areas:

  1. Centerboard Casing: The steel centerboard and its wooden casing are prone to corrosion and rot, respectively. Because the casing is often integrated into the furniture, repairs can be invasive and expensive.
  2. Fastenings and Ribs: Traditional clinker construction relies on copper rivets. "Nail sickness," where the wood around the fastening softens or the fastening itself fails, can lead to persistent leaks. Additionally, check for cracked steamed-oak ribs, especially in the turn of the bilge.
  3. Iron Ballast: Some Finesses used internal iron ballast. If water gets trapped beneath the ballast, it can lead to accelerated rot in the floors and keel plank.
  4. Deck Leaks: Many models feature marine plywood decks covered in epoxy or canvas. Any breach in this membrane can lead to core rot in the deck or the carlins (the longitudinal beams supporting the deck).

Community & Resources

The Finesse 21 enjoys a dedicated following, primarily centered around the Finesse Owners Association. This group maintains an archive of technical drawings, historical build logs, and a registry of surviving hulls. For owners looking to restore a 21, the association is the primary source for identifying original specifications and sourcing specific wooden boat-building advice tailored to Alan Platt’s unique construction methods.

The Verdict

The Finesse 21 is a "proper" little ship that appeals to sailors who value craftsmanship and traditional lines over raw speed and low maintenance. It is an ideal entry-point into wooden boat ownership for those who sail in shallow, tidal waters.

Pros:

  • Exceptional Draft: The centerboard configuration allows for "creek crawling" and drying out in tidal harbors.
  • Aesthetic Appeal: One of the most handsome pocket cruisers ever built in the UK.
  • Strong Community: The Owners Association provides excellent technical support and social opportunities.

Cons:

  • High Maintenance: Requires annual painting, varnishing, and structural monitoring typical of wooden hulls.
  • Weight and Drag: The clinker construction and displacement make it slower than modern 21-footers in light airs.
  • Aging Systems: Many 21s still carry older inboard petrol engines or early diesels that may require replacement.

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