# How do I determine my sail size?

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Hook a long tape measure up to your jib halyard (or top furling swivel on a furler see “Furler Hoist” below) just as if it were the head ring of the sail. Hoist it all the way until it stops at the top. Measure down to whatever point you intend to attach the sails tack to. This will be your MAX.

## How is sail calculated?

The conventional way to find sail area is to calculate the area of the foretriangle (FT) between the mast, headstay, and deck; the area of the mainsail triangle (M) between the mast and the boom; and add them: SA = FT + M (= IJ/2 + PE/2).

## How do you calculate jib size?

This is taken by hauling a tape measure up your halyard until it reaches the top and measuring straight down to the base of your mast. While you have your tape at the top take the time to also measure the maximum luff length by measuring to the attachment on your furler or on the deck (hank on sails).

## What are the numbers on sails?

There are four types of sail numbers, and they all get issued by different parties:

• Factory numbers – issued by the builder.
• Class numbers – issued by the class association.
• International numbers – issued by the national authority.
• Creative numbers – issued by you.

## What is I and J on a sail?

© Jesus Renedo. 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.

## How do you calculate sail load?

A: The load on a sail is proportional to the sail area times windspeed squared. The formula is: (sail area [in ft2] x windspeed2 [in knots]) coefficient = load. In our shop we use a coefficient of 0.00431. For a 350ft2 sail in 30 knots this yields a load of 1,358lb.

## What is the P measurement on a sailboat?

“P” is the luff length of the main-sail, measured along the aft face of the mast from the top of the boom to the highest point that the mainsail can be hoisted.

## What is a 100% jib?

Jibs are typically 100% to 115% LP and are generally used in areas with heavier winds. The smaller area of a jib allows it to be able to perform more efficiently in greater wind speed without the need to furl away sail shape. Typically a jib will be no greater than 115% of the fore-triangle dimensions.

## How is Genoa size determined?

Hoist your tape measure on your regular genoa halyard and measure to your regular tack fitting. If you want a 150% genoa, measure 1.5 x J from the tack fitting to the rail. Working from this position establish the minimum and maximum leach and foot dimensions.

## How tall should a sailboat mast be?

As a general rule of thumb, the height of a boat’s mast will be somewhere between 1.25 to 1.35 times the boat’s length, for an average of about 1.3 times the length overall (LOA) of the boat. An aspect of 2.5 or lower will be a low-aspect rig; above that is considered a high-aspect ratio.

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## What is an Australian sailing number?

How do I get an Australian Sailing number? In being a member with an Affiliated Club, you will be registered in the national system, are set up with an online profile, and receive an Australian Sailing Number.

## How do I get a laser sail number?

Where is your sail number located

1. For Laser sailboats built after 2010 the sail number is located in the rear of the cockpit on a sticker.
2. For Laser Sailboats Built Prior to 2010 the sail number can be decoded from the Hull Identification Number Located on the stern or on very early lasers under the bow eye.

## What’s the difference between a jib and a genoa?

A jib is a foresail that does not extend aft beyond the mast; a genoa, on the other hand, is larger and will overlap the mast and part of the mainsail. A jib sail is used for strong winds and is easy to handle, while the genoa is perfect for downwind sailing in light winds.

## What is luff and leech?

The luff is the forward or leading edge of a sail. The leech is the back edge of the sail. The clew is the bottom back corner of the sail (furthest from the mast).