The Johnson 18 Class
A dinghy sportboat sailing community
The Johnson 18 was one of the new generation sportboats. It was the first computer-optimized one-design small sailboat, intended to maximize enjoyment of the sport of sailing across the widest possible range of age, size, and skill level.
The johnson 18 class association is a non-profit organization devoted to the needs of johnson 18 owners, and offering information and contacts to people interested in these boats. come sail with us.
The goal of this web page is to increase awareness of the Johnson 18, the Class Association, and sailing in general.
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- Sailboat Guide
Johnson 18 is a 18 ′ 0 ″ / 5.5 m monohull sailboat designed by Rodger Martin and built by Johnson Boat Works and Catalina Yachts starting in 1994.
Rig and Sails
Auxilary power, accomodations, calculations.
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
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL
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.
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.
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.
Ballast / Displacement * 100
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.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
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.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )
- D: Displacement of the boat in pounds
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
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.
CSV = Beam ÷ ³√(D / 64)
Spinnaker asym. 190 sq. ft. When Johnson Boat Works closed in 1998, the molds for the JOHNSON 18 were sold to Catalina Yachts. The number of boats built by Catalina is unknown (to us).
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COMMENTS
Johnson used sailboats for sale by owner. Home. Register & Post. View All Sailboats. Search. ... Sailboat Added 18-Mar-2015 More Details: Johnson C Scow: Length:
Johnson 18 for sale, 1996, Tampa, Florida, $4,500. Go to Sailing Texas classifieds for current sailboats for sale . 1996 Johnson 18 Dynamic 2-man asymmetrical racing boat. This boat is an excellent racing boat with a good history against both Portsmouth and PERF boats, but is also stable enough for use in day cruisi
The Johnson 18 was one of the new generation sportboats. It was the first computer-optimized one-design small sailboat, intended to maximize enjoyment of the sport of sailing across the widest possible range of age, size, and skill level. The Johnson 18 Class Association is a non-profit organization devoted to the needs of Johnson 18 owners ...
Go to Sailing Texas classifieds for current sailboats for sale Johnson 18, 1996 sailing sportboat/dinghy. Fun boat, bombproof strong and super forgiving! This is hull number 146 (#46 of 100 made) Specs are at Johnson18.org for the class.
Go to Sailing Texas classifieds for current sailboats for sale . Johnson 18, 1997 This is a great boat for anybody looking to improve their sailing skills, learn about spinnakers or just go fast. The Johnson 18 was designed for the 1996 Atlanta Olympics as a 2 person racing boat, so it's quite quick, but isn't overwhelming for beginner to ...
Go to Sailing Texas classifieds for current sailboats for sale Johnson 18, 1996 sailboat for sale On Performance Trailer with Folding Tongue and New Spare Tire. Good Sails. Boat in Very Good Condition and Ready To Go. NOTE: Boat shown under sail is manufacturer photo. Maunufacturer info: The Johnson 18 is a blend of speed, simplicity and stability.
7/25/06, 1996 Johnson 18, Lansing, Michigan, asking $5,500, sold 8/15/06. Go to. This is a boat that was produced for the 1996 Atlanta, Georgia Olympics. They were specifically designed as a new boat that men and women could sail and race with out anyone having an advantage. It is also the 100th anniversary edition of Johnson Boat Works.
Johnson 18 is a 18′ 0″ / 5.5 m monohull sailboat designed by Rodger Martin and built by Johnson Boat Works and Catalina Yachts starting in 1994. Great choice! Your favorites are temporarily saved for this session.
August 25, 2000. Rodger Martin designed the Johnson 18 for Skip Johnson of Johnson Boatworks. The idea was to combine speed and stability without the use of trapezes. The result is an exciting dinghy with some near-novel features. It's a rocket. The Johnson 18. Compared to my own 15-foot Tasar, there are several areas of departure for the Johnson.
Spinnaker asym. 190 sq. ft. When Johnson Boat Works closed in 1998, the molds for the JOHNSON 18 were sold to Catalina Yachts. The number of boats built by Catalina is unknown (to us).