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. It steers with a feather-light helm, planes upwind, flies downwind, and was bred for speed by one of the oldest, family-owned, custom sailboat manufacturers in the world. With an asymmetrical spinnaker, loose footed main and roller-furling jib there is plenty of power to this unique design. The scow-like hull with pointed bow, centerboard and sail shape provide the speed. The Johnson 18 National Class Association has regatta information and tuning tips.
According to a review by Robert Perry, 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. Its a rocket…Reports say the Johnson 18 is a very well-mannered, fast and manageable dinghy. According to the brochure, an adult can stand out at the deck edge, and the boat heels only 8 degrees. The Johnsons 6-foot 7-inch beam also helps keep the boat on its feet in a breeze. A beamy, trapezeless dinghy with speed and stability.
Good Main, Jib and Spinnaker Hull and Cockpit in Very Good Condition Performance Trailer with Folding Tongue and New Spare Tire Boat Cover or phone 770-831-0403
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)
Thank you to Bill Hooper for the photo.
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