Located in Helena, Montana, this 1977 24-foot, Thames Structural Plastics J24 is a great sailboat. This one was used to teach young sailers how to race.
This J24 is in great shape. Owner remodeled it over the past year and a half. Now it is structurally sound and has the parts mounted where they are currently placed for racing.
The Johnson 4.5 HP outboard is in good running condition. Serviced in 2019, new impeller installed.
Comes with two sets of sails, one fairly old and the other about five years old. The new set of sails consist of: - One main sail - One jib sail - One genoa sail - One spiniker with pole
Items recently re-conditioned: - Port Bulkhead - Forward Stanchion base Port and Starboard - Multiple places where bad balsa core was replaced on the deck - Balsa core replaced on tiller - Keel newly faired, painted and antifoul - Deck freshly painted included non skid - Interior freshly painted - New bow lights and compass, tiller extension - New PVC Toerails
The J24 has lots of space for your family and friends, and all your boating gear.
Don’t miss out on your opportunity to own this great conditioned sailboat!
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 √LWLA 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)
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