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Seller's Description

“near-perfect proportions…a distinctive look that stands out even among other vintage boats…sails upwind and reaches well, and handles easily at sea.” –Steve Knauth, Soundings Magazine, 2011

Historic beauty at an attractive price. Few small wooden yachts ever made the transition to fiberglass construction. This 1971 Stone Horse 23 is a great example. Tir na nOg has the added feature of a custom teak deck installed by a previous owner. It has a spruce bowsprit, boomkin, mast and booms along with mahogany coamings and other trim of mahogany/teak. A new set of rock maple belaying pins for winchless line handling add to the vintage character of this fiberglass, yet still salty, old sailor.

The all wood original was designed by Samuel S. Crocker in 1931 and named after a landmark in Nantucket Sound. Massachusetts builder Edey & Duff modified the design and began building the fiberglass version in 1968. The full keel and raised flush deck were designed to handle the rough waters of Buzzards Bay. The ample cutter rig renders it very quick for its length. Tir na nOg is exceptionally well balanced, stable and easy to sail.

Tir na nOgs hull is sound and blister free. The transom-mounted rudder has a solid custom tiller. Tanbark mainsail, jib and yankee are old but free of tears and signs of repairs. All spars are in good shape. Mast was recently repaired professionally, sanded down to bare wood and varnished. V berth and quarter berths below offer cozy overnight accommodations.

The boat can be sailed as is but needs some cosmetic work and is priced accordingly.

“Moves in the merest whisper of a breeze while the long keel holds it on course and facilitates self-steering.” –Cruising World, 2006

Equipment: Trailer

Nissan 5 hp outboard engine that can mount in the boomkin and drives the boat well into current and wind.

Wood-burning Charlie Noble heater stove in the cabin

Two anchors, chain and rode

Cabin cushions

Sail covers

Fenders

Life jackets

Specs

Designer
Samuel Crocker
Builder
Edey & Duff
Associations
?
# Built
150
Hull
Monohull
Keel
Long
Rudder
Transom hung
Construction
wood/FG

Dimensions

Length Overall
22 11 / 7 m
Waterline Length
18 4 / 5.6 m
Beam
6 11 / 2.1 m
Draft
3 6 / 1.1 m
Displacement
4,500 lb / 2,041 kg
Ballast
2,000 lb / 907 kg (Lead)

Rig and Sails

Type
Cutter
Reported Sail Area
339′² / 31.5 m²
Total Sail Area
315′² / 29.3 m²
Mainsail
Sail Area
165′² / 15.4 m²
P
25 9 / 7.9 m
E
12 9 / 3.9 m
Air Draft
?
Foresail
Sail Area
150′² / 13.9 m²
I
28 6 / 8.7 m
J
10 5 / 3.2 m
Forestay Length
30 4 / 9.3 m

Auxilary Power

Make
Westerbeke
Model
Vire
HP
6
Fuel Type
Gas
Fuel Capacity
5 gal / 19 l
Engine Hours
?

Accomodations

Water Capacity
12 gal / 45 l
Holding Tank Capacity
?
Headroom
?
Cabins
1

Calculations

Hull Speed
5.9 kn
Classic: 5.74 kn

Hull Speed

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Formula

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL

5.85 knots
Classic formula: 5.74 knots
Sail Area/Displacement
19.9
16-20: good performance

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

Formula

SA/D = SA ÷ (D ÷ 64)2/3

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
19.9
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
44.4
>40: stiffer, more powerful

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Formula

Ballast / Displacement * 100

44.44
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
325.6
300-400: heavy

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
325.64
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
25.7
20-30: coastal cruiser

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
25.66
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
1.7
<2.0: better suited for ocean passages

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
1.72
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

At least 30 built of wood since 1931. Adapted for Fiberglass construction in 1968.(Edey & Duff).

This listing is presented by SailboatListings.com. Visit their website for more information or to contact the seller.

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