What is I and J on a sail?
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.
What is a boom vang on a sailboat?
A boom vang (US) or kicking strap (UK) (often shortened to “vang” or “kicker”) is a line or piston system on a sailboat used to exert downward force on the boom and thus control the shape of the sail.
What do numbers on sails mean?
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. However, racing sailboats will always have them.
What are halyards on a sailboat?
In sailing, a halyard or halliard is a line (rope) that is used to hoist a ladder, sail, flag or yard. The term halyard comes from the phrase “to haul yards”.
What is i and p on sail measurements?
“ISP” is measured from 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.
What does DWL mean on a yacht?
Normally, draft is used to mean the distance to the design waterline(DWL), but it often depends on its context of use. In addition, the bottom of the boat is usually located at the baseline so that draft refers to the distance from the bottom of the boat to the waterline.
What is the difference between a Cunningham and a boom vang?
A boom downhaul is used on a boom that connects/attaches to a track mounted gooseneck, track is mounted to the mast. 2. A cunningham is used on a gooseneck that is direct attached to a mast (no track to slide up and down on)…
Can you sail without boom vang?
If you don’t use the boom vang in all but the lightest conditions, the boom will rise up as it is eased out and the sail will twist off, spilling power out of the top of the sail.
How do sail numbers attach?
Sail Numbers – Self-adhesive pre-cut Numbers – YouTube
What is a code 1 sail?
Code 1 is a light air reaching sail, where the apparent wind angles at low speeds has a significant effect to create angles of less than 90 degrees. Code 2 is a medium air running sail, used for apparent wind angles over 90 degrees.
What line is halyards on?
Use a blended braid Vectran® or Spectra® line for the halyards, jib sheets, and guys. Avoid using polyester for these high-load applications so that you don’t have to get extra-large diameters. Polyester can be used in control lines and other lower load lines.
What is the Cunningham on a sailboat?
The Cunningham is an adjustment used to tension the luff of the mainsail to move the draft forward, offsetting the wind’s efforts to push the draft aft. Most mainsails come standard with a Cunningham cringle on the luff above the tack.
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 i J P E on a sailboat?
“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 from the highest spinnaker halyard to the deck.
What is Sheerline on a boat?
Definition of sheer line
: the stretched rope of a trail bridge to which a boat or raft is attached and along which it passes.
What is the highest point on a yacht?
Air draft is usually referred to the highest point of the yacht, usually particularly important for large sailing yachts as in many countries there are limitations in some areas. It is measured from water to the top of the yachts most prominent point.
Is cunningham same as downhaul?
The cunningham differs from a typical downhaul in the way that it attaches to the sail. The system usually consists of a line which is secured at one end to the mast or boom below the foot of the mainsail.
What causes lee helm?
The cause of lee helm is the center of pressure exerted by the wind on the sails falls too far forward of the center of resistance of the hull—the natural point at which the hull tries to pivot. This tends to push the bow of the boat away from the wind.
What is the difference between a cunningham and a boom vang?
How tight should boom vang be?
The purpose of the BOOM VANG is to prevent the top of the leech from twisting too far off to leeward and spilling the wind. A little twist in the leech is desirable in light winds, so the vang should not be set up tight in these conditions.
Where do sail numbers go?
The numbers should obviously be on the mainsail, starting or finishing 76 mm from the leech tape, each number should be 66 mm from the next one to it, and the numbers should be laid parallel to and 76 mm above or below the second mainsail batten, counting up from the mainsail foot.
How do Laser sail numbers stick?
Place the number within the pencil outline and press down to stick the peeled back area . Lift the remainder of the number and slowly peel off the backing as you smooth the number onto the sail, taking care to remove air bubbles and creases as you go .
What is a code zero on a sailboat?
5. 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 an A3 sail?
The A3 is the choice for reaching in medium air. It is a full size sail made of medium weight material. The sail is designed flatter than the A2 to improve reaching but with a longer luff than the A1 to sail broader angles in moderate breeze.
Is Dyneema good for halyards?
1 – Main halyard
For cruising polyester ropes or ropes with SK38 Dyneema® or Stirotex fibres are a good choice.