sailboat j measurement

Boat: Every boat has maximum sail dimensions that cannot be exceeded. They are defined as I, J, P and E, (also Py and Ey for Ketchs and Yawls). Unless you have existing sails to use as a reference, it is always best to physically measure the boat and not rely totally on manufacturers specifications. Occasionally rig sizes will vary even between the same make and size boat. Measurements can also be altered as a result of re-rigging.

Main Sails: Attach a tape measure to the main halyard and hoist to the maximum or to the black band around the mast if available. Measure to the main tack fitting for the P measurement. The E measurement is the length of the boom measured from the tack fitting to the clew connection or the black band around the boom if available.

Headsails (Spinnakers require I and J measurements): Attach a tape measure to the jib halyard (or top swivel of the furler) and hoist to the maximum. Measure to the deck sheer line for the I measurement. Also measure to the tack attachment point on the bow (or top of furler) for the maximum hoist measurement. Measure from the intersection of the deck and headstay to the front side of the mast for the J measurement.

Tip: tie a line to the halyard along with the tape measure in the event the tape should break you can easily retrieve the halyard.

Sails: Sails are defined by another set of terms. The luff is the leading edge of the sail. The leech is the trailing edge. The foot is the bottom edge. Jibs and Genoas have a Luff Perpendicular (LP) that is the perpendicular distance from the luff to the clew. The LP defines the sail size in terms of percentage increase beyond the J measurement as in the following examples. Headsails are designated as Number 1, 2, and 3.

Copyright © 2002-2024 by Second Wind Sails. All Rights Reserved.

The Worldwide Leader in Sailmaking

• Sail Care & Repair
• Sailing Gear
• Find A Loft
• Sail Finder
• Custom Sails
• One Design Sails
• Flying Sails
• New Sail Quote
• 3Di Technology
• Helix Technology
• Sail Design
• NPL RENEW Sustainable Sailcloth
• Sailcloth & Material Guide
• Polo Shirts
• Sweaters & Cardigans
• Sweatshirts & Hoodies
• Accessories
• Shop the look
• Mid & Baselayers
• Deckwear & Footwear
• Luggage & Accessories
• Fall Winter '24
• North Sails x 37th America's Cup
• Sailor Jackets
• SALT X North Sails
• NS x Slowear
• T-shirts & Tops
• Sailor Jacket
• Sustainability
• North Sails Blog
• Sail Like A Girl
• 37th America's Cup
• Icon Sailor Jacket
• Our Locations
• Certified B Corporation
• North SUP Boards
• North Foils
• North Kiteboarding
• North Windsurfing

SAIL FINDER

SAILING GEAR

COLLECTIONS & COLLAB

COLLECTIONS

WE ARE NORTH SAILS

ACTION SPORTS

Popular Search Terms

Organic cotton

Scuba fleece

Drawstring hood

Utility pocket

Stand collar

Sorry, no results for ""

Subscription

Welcome aboard.

We want to make our emails as relevant as possible for you.

Interests saved

Something went wrong, please try again

Welcome to North Sails

Stay up to date with the latest North Sails news.

Receive a 10% discount code for your first apparel order. Excludes sails and SUP’s. See our Terms and Conditions .

Yes, I agree to the terms of use and privacy policy.

SAIL PLAN DIMENSIONS

Figure out your rig dimensions when it comes to your sails.

The basic rig dimension for a yacht are generally understood. However, there are some differences in how some sailors describe these dimensions. Here is how we define them at North Sails.

I – Height of Foretriangle Elevation of Forestay, measured down to elevation of main shrouds at sheer line.

J – Base of Foretriangle Horizontal distance measured from front face of mast at deck to position of headstay at sheer line.

P – Mainsail Hoist Elevation of upper mast band or maximum main halyard position, measured down to lower mast band or top of boom.

E- Mainsail Foot Horizontal distance measured from aft face of mast at top of boom to boom band or maximum outhaul position.

Is – Height of Inner Foretriangle Elevation of Forestay, measured down to elevation of main shrouds at sheer line.

Js – Base of Inner Foretriangle Horizontal distance measured from front face of mast at deck to position of inner headstay at sheer line.

Py – Mizzen Mainsail Hoist Elevation of upper mast band or maximum main halyard position, measured down to lower mast band or top of boom.

Ey – Mizzen Mainsail Foot Horizontal distance measured from aft face of mizzen mast at top of boom to boom band or maximum outhaul position.

ISP – Elevation of Spinnaker Halyard Measured down to elevation of main shrouds at sheer line.

SPL – Spinnaker Pole Length

STL – Spinnaker Tack Length Horizontal distance measured from front face of mast at deck, forward and horizontally to position of spinnaker tack attachment point.

GET IN TOUCH

REQUEST A QUOTE

BROWSE ALL SAILS

FIND YOUR SAIL

Featured stories, offshore sailing guide, how to care for your foul weather gear, npl renew faq.

• Refresh page

By Product Categories

Small Boat Blocks

Big Boat Blocks

Complementary Hardware

Travelers & Genoa Leads

Mainsail Handling

Headsail Handling

Mooring Solutions

Spare Parts

Accessories

Harken Canvas

Sportfishing

Fly Soft-Attach Blocks

Carbo Air Blocks

Small Boat Classic

Flip-Flop Small Boat

GP Catamaran Ceramic Mainsheet Systems

Protexit™ Exit Blocks

Through-Deck

Wire High-Strength

Dinghy Vang

Small Boat Deck Organizers

Midrange Classic

Midrange Deck Organizers

Zircon Blocks

Element Blocks

Black Magic Air Blocks

Cruising ESP Blocks

Megayacht Blocks

Stainless Steel Blocks

Black Magic Air Runners

FlatWinder Powered Blocks

Mastbase Blocks

Over-the-Top

Crossover Blocks

Big Boat Deck Organizers

Cam Cleats & Kits

Cam Cleat Accessories

Cam Cleat Bases

Stand-Up Bases

Deck Organizers

Spinnaker Pole Cars

Soft Attachments

Fixed Padeyes

Removable Padeyes

Bolt-Down Fairleads

Grand Prix Jib Leads

Halyard Tensioners

Tiller Extensions

Peter's Desk Drawer

Dinghy Jib Leads

Crossbow Pivoting Self-Tacking Jib Traveler

13 mm Micro

22 mm Small Boat

27 mm Midrange

32 mm Big Boat

Windward Sheeting

42 mm Mini-Maxi

T-Track Genoa Lead

Access Rail System

13 mm AA Battcar System

22 mm A Battcar System

27 mm B Battcar System

32 mm C Battcar System

18 mm Switch Battcar System

26 mm Switch Battcar System

26 mm Trysail Switch

32 mm Switch Battcar System

32 mm Trysail Switch

40 mm Switch Battcar System

40 mm Trysail Switch System

Furling Mainsail Outhaul Systems

Single Line Reefing

Harken Vang-Master

Carbo Racing Foil

Small Boat Furling

Small Boat Underdeck

Reflex Furling

MKIV Jib Reefing & Furling

MKIV Underdeck Jib Reefing & Furling

Furling Accessories

Powered Furling

MKIV Ocean Furling

SnubbAir (Not a Winch)

Grand Prix Winches

Air Winches

Circuit Breakers

Analog Switches

Digital System Switch

Aluminum, Chrome & Bronze Winch Handles

Carbo OneTouch Locking Winch Handle

Service Kits

CLR Mooring Winches

Electric Captive Reel Winches

Hydraulic Captive Reel Winches

UniPower Radial

Single-Acting Integral Backstay Adjuster

Single-Acting Cylinders

Locking Cylinders

Double-Pull Cylinders

Grand Prix Cylinders

Hydraulic Cylinder Rod End Blocks

Hydraulic Cylinder End Fittings

Control Valves

Control Manifolds

Control Panels

Compact Control Panel

Rotary Pumps

Hydraulic Pump Handles

Power Systems

Repair Kits

Ball Bearings

Block Spare Parts

Traveler Cars

Furling Spare Parts

Winch Spare Parts

Winch Service Kits

Blockheads Gear

Promo & Gifts

Marine Grip

Blue Performance

Jeep/Truck tops

Garage storage

One-design Covers

Boat accessories

Canvas bags

By Type of Sailing

Dinghy / One-Design

Offshore Racing

Coastal / Day Cruising

Bluewater Cruising

Megayachts / Custom

Service Guide

Tech/Service

deck layouts

Data Sheets (SDS)

How to choose

System diagrams

Calculators

Reeving diagrams

Traveler Purchase Selection Guide

How to Choose

Testimonials

Hoister Videos

Request a Quote

Request Samples

Fabric details

Cover Styles

Canvas Videos

Contract Services

Materials and Components

Our Equipment

Contract Cut-and-Sew Project Spotlight

• Harken at the front
• Safety & Rescue

Support / Tech/Service Articles

Rig Dimensions

The following abbreviations are often used to describe various measurements on a sailboat. Precise technical definitions exist for each abbreviation, but the following is a list of simple descriptions.

If you would like to link to or reprint this article please contact  [email protected] .

Product Categories

• United States
• New Zealand
• United Kingdom

Home > Resources > Rig Specification Diagram For Sailboats: Mainsail & Headsail

Rig Specification Diagram For Sailboats: Mainsail & Headsail

30 December 2020

Ask Precision Sails , Design , Featuring - Partners , Headsail , Mainsail , Measurements , Sails , Technical Tags: Furling , Headsail , Mainsail , Precision Sails , rig , Sails , Specifications , Specs

Sailboat Rig Specs: Precision Sails Defined

The above infographic shows how Precision Sails label sailboat rig specifications. Continue reading below to see definitions and basic how-to tips on how to measure them below. Rig specs are important for designing a sail suited for your applications and boat. When you decide to get a custom sail from Precision, in most cases, you will be taking your own boats measurements. So it’s important to know about rig specs!

One thing we tell sailors here at precision is “The effort you put into measuring really does translate into the quality of sail you get” If quality measurements are given to designers, it allows them to create an excellent performing sail. It’s essential that good information is passed on to the designers when they create your sail.

The more information you can give to us, the better. One detail we strive to get right with sailors is the sailboats measurements. Taking your own sail boats measurements is an imperative part of creating a custom sail.

Photographs are also a handy tool. They let our designers understand your rigs better and can make suggestions and improvements.

Sometimes sailors think sails are like Lego, or the marine equivalent of a Honda Civic car part, where you can just swap out sails like its nothing. But this isn’t further from the truth. Sailboats are handmade. There can be many differences from one model to the next. Your boat might not be fresh out of the boatyard. It might be 36 or more years old, all this time equates to the boat changing, modifications being made, new parts being installed, break in periods, different maintenance intervals. There are a whole slew of reasons why your boat’s rig specs could be, and probably are, different from the next. This is the main reason we are so thorough with our measurement forms and design process.

Mainsail Rig Specs

P – Maximum Mainsail Hoist Length (Maximum luff): On the main halyard, hoist a measuring tape measure until it stops without jamming the halyard into the shiv. Measure straight down along the mast to the top of the boom at the tack. Disconnect Mainsail from Halyard. Be sure the boom is in the normal sailing position.

E – Maximum Foot Length: Measure from the aft face of the mast to the shackle of the outhaul. Make sure the outhaul is pulled back to it’s tightest position. When you get a maximum foot length we are not actually going to design the sail exactly to that length but rather a couple inches shorter. This allows you to adjust your outhull and not have your adjustments pushed against the shiv at the end of the boom, as well as changing tension in the sail.

Backstay Measurement: This measurement serves as a guide so we know how far the leech of your sail can be pushed without it overlapping the backstay. Sometimes you want this for certain performance reasons, but most cruisers do not want it to overlap, because it results in less wear.

Headsail Rig Specs

I – Foretriangle Height: Measure from the top of the halyard to the side deck on the forward side of the mast.

J – Foretriangle Base: Measure along deck from the forestay to the Forward face of mast. The J measurement is just a secondary check to make sure nothing has been changed over the years and there’s no surprises.

1. First Hank: Measure from tack to the first hank position on headstay wire above turnbuckle.

2. Maximum Luff Measurement: Measure from top of halyard to the bearing point of tack fitting

3. Waterline to Forestay: At the bow, measure the vertical distance from the waterline up to the intersection of the deck and forestay.

4. Waterline to Base: At the front of the mast, measure the vertical distance from the waterline up to the deck.

5. Headstay to Forward Track: Measure from tack attachment on deck to the forward edge of the headsail track you will be sheeting to.

Furling Head Sails

Headsail rig dimensions change slightly with a furling unit. The following videos do a good job of displaying the process of taking the measurements.

Furling drum height: Measure from the deck to the location of the tack attachment point on your furling drum. Measure the pennant separately.

After you get us your measurements. We will start customizing the design of your sail. There will be a consultation during the design process. We get you involved with this process because there are several things you can adjust for your sail – how far do you want the clew off the deck, where do you want the clew to sit and any thing else you might think of.

Put the knowledge you just gained into good use and take some good measurements! If you’re in need of a sail request a quote!

precisionsails

Related Posts

Full Battens vs Partial Battens vs 2 Full plus 2 Partial Battens

 Full Battens    VS    Partial Battens      At 

Precision Sails we are asked every day during our customer quote consultation  “Should I choose Full Battens or Partial Battens for my new mainsail?”  Whether you are cruising or racing you will need to examine the pros and cons of adding full battens to your main sail.Positive Aspects of Full […]

Memories of Sail Repairs, Replacement Sails and FINALLY New Sails

I have had a Tanzer 26 for over 20 years now. The vessel, without much imagination I call The Boat, has served me well and without complaint through yearly cruises on Lake Ontario with my three kids and day sailing with the wife. Did I mention that my wife is a good sport but a definitive lover of a good.

My Need for Cruising Speed Demands a Great Suit of Sails

My Need for Cruising Speed Demands a Great Suit of SailsI like to sail fast mostly in the heavy winds that Lake Ontario throws.

" * " indicates required fields

Thanks for telling us a bit about yourself and your boat. Our team will send you a preliminary quote based on information we have gathered from sailors similar to you.

We will give you a call in order to narrow down the options on your quote and improve the accuracy. If you want us to call you at a specific time, feel free to schedule a time on our calendar!

Thanks for telling us a bit about yourself and your boat. Our team will reach out to offer some suggestions and get started on finding you the perfect sail!

Sailboat Rig Dimensions Database Sail area calculations Mainsail Area = P x E / 2 Headsail Area = (Luff x LP) / 2 (LP = shortest distance between clew and Luff) Genoa Area 150% = ( 1.5 x J x I ) / 2 Genoa Area 135% = ( 1.35 x J x I ) / 2 Fore-triangle 100% = ( I x J ) / 2 Spinnaker Area = 1.8 x J x I No records retreived. S Copyright � 2008 Sailboat Rig Dimensions All Rights Reserved. Sailboat Rig Dimension The Rig Dimension list is helpful in determining your boat's approximate sail area. Once you have determined your sail area, the figures can be used to calculate the loads generated by the sails for any given wind velocity. The loading calculations are essential to selecting gear with adequate strength for its intended application.These definitions are general enough to provide guidelines to approximate your sail area. None of the information here is guaranteed to be accurate, as boat builders often change rig dimensions without notice. You should physically measure your boat and record precise measurements to calculate accurate sail area figures. CLR Marine has over 8000 keelboats specs listed to help you select hardware or calculate loads. Use this list every time you need to determine your boat's sail area. Click on the appropriate letter to find the rig dimensions of your sailboat: HOW TO CALCULATE SAIL AREAS The following formulas will give you approximately areas for: Mainsail = (P x E) / 2 (add 10% for racing mains) 155% Genoa = (( J x I ) / 2) x 1.65 135% Genoa = (( J x I ) / 2) x 1.44 100% Jib = ( I x J ) / 2 Racing Symmetrical Spinnaker = 1.8 x J x I Racing Asymmetrical Spinnaker = 1.8 x J x I Cruising Asymmetrical Spinnaker = 1.65 x J x I  DEFINITIONS "P" is the luff length of the mainsail, measured along the aft face of the mast from the top of the boom to the highest point that the mainsail can be hoisted or black band. "E" is the foot length of the mainsail, measured along the boom from the aft face of the mast to the outermost point on the boom to which the main can be pulled or to the black band. "I" is measured along the front of mast from the genoa halyard to the main deck. The main deck is where the deck would be if there were no deckhouse. "J" is the base of the foretriangle measured along the deck from the headstay pin to the front of the mast. "JSP" is the length of the spinnaker pole or the distance from the forward end of the bowsprit (fully extended) to the front face of the mast. "ISP" is measured form the highest spinnaker halyard to the deck. "PY" and "EY" are, respectively the luff length and foot length of the mizzen of a yawl or ketch measured in the same way as for the mainsail. "IY" is the measurement from the staysail halyard to the deck. "JY" is the measurement from the staysail stay to the front face of the mast. "LP" is the shortest distance between the clew and the luff of the genoa. Please note that the measurement rules for rig dimensions vary from class rule to class rule and from measurement rule to measurement rule. Many yacht designers use different definitions as well. These definitions are general enough to provide guidelines to approximate your sail area. Sailboat Rig Dimensions I = Height of headstay termination above the sheer line. J = Distance between the headstay termination at the deck and the front of the mast at the sheer line. P = Distance between black bands on the mast, or the maximum luff length of the main. E = Distance between black bands on the boom, or the maximum foot length of the main. PY & EY are similar to P & E , but indicate mizzen dimensions. TYPE/CLASS I J P E DSPL 10 METER 65 30 75 30 30000 11 METER 32.17 10.17 36.08 13.58 3600 11 METER ODR 32.17 10.17 36.08 13.58 3600 1D 35 42.49 12.52 44.46 18.58 5900 1D48 57.7 16.75 61.58 23 17860 22 SQ METER           30 SQ METER           5.5 METER           6 METER           6 METER MODERN           6.5 M SERIES 31.7 8.75 30.5 10.8 2350 6.5M 36.42 7.92 33.83 12.42 1550 75 METER           8 METER (PRE WW2) 41 16 54.3 20 18500 8 METER MODERN           Sailboat specifications Last update: 13rd March 2020 J/24's main features J/24's main dimensions, j/24's rig and sails, j/24's performances, j/24's auxiliary engine, j/24's accommodations and layout. Similar sailboats that may interest you: 新艇・中古艇・中古ボートのボートワールドは新艇・中古艇情報をリアルタイムに掲載！ 新艇情報 J BOATS J/40 J BOATSモデル一覧 SHIP DETAIL 新艇情報 J BOATS J/40 046-760-4840 Ｊボート 最高傑作 ・Ｊ/４０ ！ デビューです！！ 専門技術が結集されたこのボートは、今までの４０ﾌｯﾀｰの枠にとらわれず、沿岸レースから外洋レースまで、そして純粋なファミリーフレンドリークルージングを余すことなく実現体感できるスペシャルボートです！ セイリングの純粋な喜び・バランスの取れた安定した高性能ヨットを操るスリルは、まさにＪボートのＤＮＡの一部です！ 名デザイナーとＪコンポジットのコラボレーションによる、自然光あふれ目を引くような全体的な空間感覚を優先したインテリアは素晴らしく、目に見えない船体構造は、類まれなサンドイッチ/インフージョン技術によりカスタム設計され、居住性を犠牲にする事なく、卓越した船体剛性と最適な強度対重量：バランスを実現し提供いたします。 セイリングの喜びと至福の居心地を手に入れたい方々、そして今までのＪ's を愛好する方々にとっても、スペシャルなカスタムボートの誕生です！ ショップホームページへ 販売店の在庫情報を見る 60TH ANNIVERSARY SI LIFESTYLE SI SPORTSBOOK GIFT GUIDES SWIM SEARCH BUY THE ISSUE Ellie Thumann Goes Golden in Deep Yellow Swimwear on SI Swimsuit Set in Mexico Martha zaytoun | 8 hours ago. Welcoming new faces to the pages of the SI Swimsuit Issue is always a pleasure. Around here, where membership in the brand family is concerned, our mentality is always the more the merrier. With that being said, we love when our models return to the set of SI Swimsuit year after year. There is nothing better than getting the chance to catch up with familiar faces during photo shoots for each issue. Among those models we were absolutely thrilled to have join us for another feature this year was Ellie Thumann . The content creator first came to the brand in 2023, when she traveled to Puerto Rico with photographer Derek Kettela and the rest of the brand crew for an unforgettable denim-themed feature. The snapshots from the day were nothing if not a testament to her incredible skill in front of the camera lens—and they earned her a spot within the pages again this year. For the 60th anniversary issue, Thumann traveled to Mexico for a much more vibrant photo shoot. Don’t get us wrong, we loved every bit of the denim and navy styling for her rookie feature. But there was just something about the look of her bright swimwear against the backdrop of the bright blue waters and verdant green trees in the Mexican Caribbean that made for a truly remarkable experience. And of all the swimsuits, we have to say some of our favorites were her two golden yellow looks. The combination of the bright green backdrop and vibrant swimsuits was nothing short of incredible. Check them out below. MARTHA ZAYTOUN Martha Zaytoun is a writer on the Lifestyle and Trending News team for SI Swimsuit. Before joining SI Swimsuit in 2023, she worked on the editorial board of the University of Notre Dame’s student magazine and on the editorial team at Chapel Hill, Durham and Chatham Magazines in North Carolina. When not working, Zaytoun loves to watercolor and oil paint, run and water ski. She is a graduate of the University of Notre Dame and a huge Fighting Irish fan. 371 IMAGES Understanding Sail Dimensions and Sail Area Calculation 1.3 Understanding Sail Dimensions and Sail Area Calculation Sail Measurement Assistance Sailboat Size Guide for Beginners and PROs Understanding Sail Dimensions and Sail Area Calculation VIDEO Sailboat tours Lisbon Sailboat runs aground on reef off Waikiki Beach Spurs Line and Net Cutter New J/111 One-Design: First HD Walkthrough The Sailboat Launch Rowing 12 ft Expandacraft with sailboat frame COMMENTS Understanding Sail Dimensions and Sail Area Calculation Primary dimensions for calculating areas of triangular sails. It's usually calculated as:~. Area = (luff x foot)/1.8, or. Area = (P x E)/1.8, where:~. 'P' is the distance along the aft face of the mast from the top of the boom to the highest point that the mainsail can be hoisted, and. 'E' is the distance along the boom from the aft face of the ... Sail Measurement Assistance Sail Measurement Assistance. Boat: Every boat has maximum sail dimensions that cannot be exceeded. They are defined as I, J, P and E, (also Py and Ey for Ketchs and Yawls). ... The LP defines the sail size in terms of percentage increase beyond the J measurement as in the following examples. Headsails are designated as Number 1, 2, and 3 ... Sailboat Rig Dimensions: J Sailboat Rig Dimensions: J. JA - JE - JO. Definitions: I = Height of headstay termination above the sheer line. J = Distance between the headstay termination at the deck and the front of the mast at the sheer line. P = Distance between black bands on the mast, or the maximum luff length of the main. E = Distance between black bands on the boom ... SAIL PLAN DIMENSIONS Here is how we define them at North Sails. I - Height of Foretriangle. Elevation of Forestay, measured down to elevation of main shrouds at sheer line. J - Base of Foretriangle. Horizontal distance measured from front face of mast at deck to position of headstay at sheer line. P - Mainsail Hoist. Rig Dimensions If your boat is near one of our lofts, we'll come over and measure; if not, we'll mail you a measurement form. When you see this form, you will quickly appreciate how "customized" every one of our sails is. The following rig dimensions designated by "I", "J", "P", and "E" are needed to produce a price quote. They are ... Rig Dimensions The following abbreviations are often used to describe various measurements on a sailboat. Precise technical definitions exist for each abbreviation, but the following is a list of simple descriptions. LOA Length Overall - overall tip-to-tip length of the boat LWL Length Waterline - length of waterline of the boat DWL Design Waterline -theoretical waterline length of boat as opposed to LWL ... How to Measure for a New Headsail (Jib or Genoa) Rig Measurements - Now we are going to get onto the boat and start to take the measurements of the rig as it sits today. This will ensure that your sail designer is designing a sail for your boat and not the boat that it started as. The two measurements that are required are the I measurement and the J Measurement. The I is the the distance ... Rig Specification Diagram For Sailboats: Mainsail & Headsail Headsail Rig Specs. I - Foretriangle Height: Measure from the top of the halyard to the side deck on the forward side of the mast. J - Foretriangle Base: Measure along deck from the forestay to the Forward face of mast. The J measurement is just a secondary check to make sure nothing has been changed over the years and there's no surprises. PDF PHRF-NW Standard Dimensions and Sail Measurements v.012023 SAIL DIMENSIONS: "SLE""SGM""SGF""SPL""H""WPL"Rig foretriangle height measured along the foreside of the mast fro. the main deck datum to the top of the jib halyard sheave. The height of the deck used as datum for "I" measurement shall be ta. n as 4% of beam above the shear line abreast of the mast. For boats similar to ... Sailboat Rig Dimensions Official Website Sailboat Rig Dimensions Database. Sailboat Rig Dimensions Database. Sail area calculations. Mainsail Area = P x E / 2. Headsail Area = (Luff x LP) / 2 (LP = shortest distance between clew and Luff) Genoa Area 150% = ( 1.5 x J x I ) / 2. Genoa Area 135% = ( 1.35 x J x I ) / 2. Sailboat Calculator A tool to calculate performance ratios for monohull sailboats. Use the search bar to look up dimensions for boats currently in our database. You may also enter a boat's dimensions directly in Part 2. ... RIG MEASUREMENTS (when available): Definitions I: J: P: E: Press Reset CALCULATE. to see the derived quantities displayed below in Part 3. Jib Overlap Calculator Calculate jib overlap by entering the sail and "J" measurements below and pressing the "Calculate" button. Any unit of measure is okay as long as it's consistent and just a number. So meters, inches, or feet will work, but you may need to use "decimal feet" to keep it precise. For example, 35.5 will work, but 35' 6" will not. SAILBOAT RIG DIMENSIONS Use this list every time you need to determine your boat's sail area. Click on the appropriate letter to find the rig dimensions of your sailboat: The following formulas will give you approximately areas for: Mainsail = (P x E) / 2 (add 10% for racing mains) 155% Genoa = ( ( J x I ) / 2) x 1.65. 135% Genoa = ( ( J x I ) / 2) x 1.44. Sailboat Rig Dimensions Sailboat Rig Dimensions. I = Height of headstay termination above the sheer line. J = Distance between the headstay termination at the deck and the front of the mast at the sheer line. P = Distance between black bands on the mast, or the maximum luff length of the main. E = Distance between black bands on the boom, or the maximum foot length of ... J/30 Kelsall Sailing Performance (KSP): Another measure of relative speed potential of a boat. It takes into consideration "reported" sail area, displacement and length at waterline. The higher the number the faster speed prediction for the boat. A cat with a number 0.6 is likely to sail 6kts in 10kts wind, a cat with a number of 0.7 is likely ... J/105 Technical Specifications White gel coat hull with single (1.50" to 3.00") tapered bootstripe. Large sit-in cockpit with 6.5' seats with backrests, suitable for cockpit cushions. One lazarette locker and two cockpit seat lockers w/flush spring loaded latches. Swimming and boarding platform sculptured into transom with integral ladder. J/24 (J/Boats) Sailboat specifications. Last update: 13rd March 2020. The J/24 is a 24' (7.32m) one design sailboat designed by Rod Johnstone (United States). She was built since 1977 (and now discontinued) by J/Boats (United States). J/22 Technical Specifications Spinnaker Launching Bag (installed). Above specifications are subject to change without prior notice or obligation, J Boats reserves the right to periodically upgrade specifications through additions, deletions and substitution. J/22 Technical specifications & dimensions- including layouts, sailplan and hull profile. J/80 technical specifications J/80 Specifications (Sample Specification) Composite hull and deck of GRP balsa sandwich with E-glass fabrics, additional reinforcing in way of highly loaded hardware. Vinylester and ISO NPG gelcoat in hull for osmotic gelcoat blister protection. Molded GRP main bulkhead to absorb the direct loads of the shrouds and mast compression. J/24 Kelsall Sailing Performance (KSP): Another measure of relative speed potential of a boat. It takes into consideration "reported" sail area, displacement and length at waterline. The higher the number the faster speed prediction for the boat. A cat with a number 0.6 is likely to sail 6kts in 10kts wind, a cat with a number of 0.7 is likely ... 新艇情報 J Boats J/40 Jボート 最高傑作 ・J/40 ! デビューです!! 専門技術が結集されたこのボートは、今までの40ﾌｯﾀｰの枠にとらわれず、沿岸レースから外洋レースまで、そして純粋なファミリーフレンドリークルージングを余すことなく実現体感できるスペシャルボートです! Ellie Thumann Goes Golden in Deep Yellow Swimwear on SI ... MARTHA ZAYTOUN. Martha Zaytoun is a writer on the Lifestyle and Trending News team for SI Swimsuit. Before joining SI Swimsuit in 2023, she worked on the editorial board of the University of Notre Dame's student magazine and on the editorial team at Chapel Hill, Durham and Chatham Magazines in North Carolina. J/109 Kelsall Sailing Performance (KSP): Another measure of relative speed potential of a boat. It takes into consideration "reported" sail area, displacement and length at waterline. The higher the number the faster speed prediction for the boat. A cat with a number 0.6 is likely to sail 6kts in 10kts wind, a cat with a number of 0.7 is likely ... Windsor: Campaigners end three-day climate protest at castle Climate activists from campaign group Extinction Rebellion (XR) have ended a three-day series of protests near Windsor Castle. Tents, stages and speakers were set up without permission in Windsor ... catamaran gulet motorboat powerboat riverboat sailboat yacht