J/100 Standard
Sailboat specifications.
- Last update: 13rd March 2020
J/100's main features
J/100's main dimensions, j/100's rig and sails, j/100's performances, j/100's auxiliary engine, j/100's accommodations and layout.
Similar sailboats that may interest you:
Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.
- Sailboat Guide
J/100 is a 32 ′ 9 ″ / 10 m monohull sailboat designed by Rod Johnstone and built by J Boats starting in 2005.
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)
Shoal draft: 4.5’. Carbon spar opt. Removable Hoyt (self tacking) jib boom opt.
Embed this page on your own website by copying and pasting this code.
- About Sailboat Guide
©2024 Sea Time Tech, LLC
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
IMAGES
VIDEO
COMMENTS
Two-tone (beige) molded nonskid floor in head area. Teak trimmed backrest outboard of each settee berth. Marine head with 14 gal holding tank and "Y" valve. Molded sink with overboard drain in head. Holding tank overboard discharge manual pump. Teak trimmed storage bin to starboard of head.
Time’s too precious and the alternatives too numerous to put up with any boat less than what will recapture those simple joys of sailing. J/100 is designed to do just that. The comforts that experienced sailors appreciate are part of the package. A two cylinder inboard saildrive hums along at 6.5 knots like a sewing machine, when you can hear it.
Sailboat specifications. Last update: 13rd March 2020. The J/100 is a 32’10” (10m) dayboat designed by Rod Johnstone (United States). She was built since 2004 (and now discontinued) by J/Boats (United States). The J/100 is as well listed, on Boat-Specs.com, in Shoal draft version ( see all the versions compared ).
Of last year's high-profile class of luxury daysailers—including the Morris 36, Hinckley DS42, and Friendship 40—the J/100 is the only performance boat in the group and arguably its only true daysailer. A few things make this boat a joy to sail. Under main and jib alone—478 square feet of sail—the 6,500-pound boat has ample horsepower.
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. 37.69. <40: less stiff, less powerful.