Most replacement spinnakers begin with the dimensions of the existing sail. Boat and rig measurements become important when there is no reliable specification to copy.
If you have the sail dimensions
Enter the known finished dimensions:
| Configurator field | Meaning |
|---|---|
| Luff | One side edge of the sail |
| Leech | The other side edge; on a symmetric sail it normally matches the luff |
| Foot | The distance between the two lower corners |
| Half Width | The width between the side-edge midpoints |
For a symmetric spinnaker, the two side edges and two lower corners are mirror images. The separate Luff and Leech fields let an existing measured specification be entered as it is recorded; if the leech is omitted, the system uses the luff.
If the old sail sets well, send its measurement report or a clear photograph of the written specification. This is usually more useful than reconstructing the sail from the boat.
If you do not have reliable dimensions
Select the correct boat and rig first. The sailmaker can then establish a starting size from the boat record and the intended use.
Additional information may be requested where the record is incomplete or the rig has changed. That can include the spinnaker hoist, the pole length and photographs of the masthead, pole and deck arrangement. These are design inputs when a new size has to be established; they are not required again when a reliable finished-sail specification already defines the order.
Half width and area
Half Width is part of the entered sail specification and describes how much width the sail carries through its middle. The system also displays SHW / SFL and Pricing Area as calculated results.
Those results help review the specification, but they do not replace the four finished dimensions.
Before production
A sailmaker checks the dimensions against the selected boat, usage and cloth. Any difference between an existing specification and the boat record is resolved during Sailmaker Review, not silently changed.