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.