What are IJPE sail measurements?
“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.
What do the numbers on a sail mean?
One word: Racing. The numbers themselves usually don’t mean anything. Usually, the number is essentially “how many sails of this model have been produced before this one”. So, the first boat will have sail number 1, the 1000th will have sail 1000. Not all boats will come with numbered sails.
What is Foretriangle height?
IG is defined as the height of the foretriangle and is the vertical distance from the mast datum point (at the sheerline at the mast) to the forestay attachment to the mast. Similar to IG, ISP is the spinnaker halyard height and is the maximum height that the head of the spinnaker or headsail set flying can be hoisted.
How is forestay length measured?
Measure the distance from the forestay attachment point on the mast to the bottom of the forestay where it intersects the deck. STL is measured with the mast up. It is the longest of any of the following: Spinnaker pole length: Rig the pole at a convenient height horizontally on the mast on the centreline of the boat.
What is luff and leech?
Luff -A sail’s forward edge. The luff of the mainsail is usually hoisted up and attached to the mast. The luff of the jib is attached to the forestay. Leech – The sail’s back edge.
What is the mast height?
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.
How do I choose a sail number?
Sail numbers are generally assigned in consecutive order. They are assigned by either the builder, class association (for inland competitive racing), or national authority (required for offshore racing yachts). It isn’t mandatory to register an official number. If you don’t compete you may assign your own number.
How do you measure foresail?
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).
How do you size a jib?
The jib size as expressed as a percent is found by dividing the “LP”(luff perpendicular) by the “J”(distance from the front of the mast to headstay along the deck) dimension for that particular boat. For example if the LP was 15′ and the J was 10′ then 15/10= 1.5.
What is the difference between J and P on a sailboat?
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. The rigging mast of a sailboat is a tall vertical pole which supports the sails.
What is the area of the main sail and jib?
Mainsail area is approximately (P * E)/2. This is only approximate, since most main sails are cut with some roach. Jib area is approximately (I * J)/2.
What sail dimensions do I need for my sail?
The required sail dimensions for calculating the area of any triangular sails are usually its height and the length of its foot. But that only works for mainsails and mizzens with no roach, and jibs with a 90 degree angle at the clew – and what about high-cut headsails, spinakers and cruising chutes? Read on…
What is the difference between J and P on a mast?
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. The rigging mast of a sailboat is a tall vertical pole which supports the sails. Bigger ships could have several masts.