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## How is sail area calculated?

The nominal sail area is calculated as **the sum of the foretriangle area** (one-half the base, or J dimension, multiplied by the height, or I dimension) and the mainsail area (one-half the foot, or E dimension, multiplied by the hoist, or P dimension).

## How do you calculate jib size?

The best way to measure the tape is to use **Calipers that can measure in millimeters**. If you don’t have a set use a set of drill bits and either slide them up the track in your furling system or hold them up to the luff tape on your existing sail to determine the proper size.

## What is a good capsize screening formula?

The capsize screening value for any boat is found by **dividing the cube root of the boat’s displacement volume into its maximum beam (Bmax)**. The higher the resulting number is than a value of 2.0, the greater the chance that the boat will be unduly prone to capsize; if it is below 2.0, it should be safe offshore.

## What is the difference between a jib and a genoa?

Jibs are typically **100% to 115% LP** and are generally used in areas with heavier winds. … Typically a jib will be no greater than 115% of the fore-triangle dimensions. A genoa is similar to a jib but is larger and reaches past the mast. It will typically overlap a mainsail to some extent.

## What is a code zero sail?

A code zero is strictly **a downwind sail**.

A code zero is often classified as a spinnaker in terms of racing, hence the restriction on the length of the mid-girth, but it’s not a true downwind sail. If you’re going downwind, you’ll use either a symmetrical or asymmetrical spinnaker.

## What is a #4 jib?

# 4 Jib. **Reduced size** Jib for use when the mainsail is reefed or nearly reefed. This sail is short of maximum luff length and has a reduced foot length to allow effective steering in large waves and reduce mainsail backwind.

## What do the numbers on the mainsail mean?

it’s a racing thing. the **sail number lets the race committee know which boat is which, so it can record their finishing order**. 21-01-2010, 18:28.