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“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
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.
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
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.
SA/D = SA ÷ (D ÷ 64)2/3
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.
Ballast / Displacement * 100
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.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
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.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
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.
CSV = Beam ÷ ³√(D / 64)
At least 30 built of wood since 1931. Adapted for Fiberglass construction in 1968.(Edey & Duff).
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