Spinnaker sail design software

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A North Sails Expert is ready to answer all your questions and recommend the best sail for you. Our goal? It works ok in Windows XP, don't know about W7.

It has 3 different softwares: 1- Sailcut 1. Enjoy it! You must log in or sign up to reply here. Show Ignored Content. Similar Threads. Replies: 0 Views: 1, Replies: 13 Views: Tops Jan 8, at PM. Like all other sails, a spinnaker has sectional camber, which is best put in correctly now. Increasing the camber also shortens the straight line leech length — to check the head position again.

Azure only uses Girth as the last major control of sail shape, and not the Luff Curve. They are effectively, but not exactly, the same thing, and change the shape viewed from ahead or behind the spinnaker. This can be altered to fit, of course, but it give a nice sail from which to finesse as you wish.

We looked at this in the theory part of this article, and now we are going to look at this important issue again. Azure gives you the tools to check the Geodesics and gives you both the whole leech geodesic AND the half leech geodesic. We must either reduce the girth, OR increase the camber a more spherical shape to support this girth. An increase of camber will change the Mitre Curve the profile of the sail, so that will need to be checked again. In Azure, only use the Port edge of the sail, the one attached to the pole for judging the geodesic — the other is NOT accurate.

Spinnaker 3-D design is a cyclic process, going through each parameter and checking, over and again until the sail is right in all regards. Once you have a library of good designs for all Aspect ratios then you can simply choose the correct one and have very little to do other than checking girths.

Spinnaker Design I will be talking through a little of what I have discovered over the years about spinnaker design, and will use a common sailmaking design program — SMAR-Azure Project to illustrate some of the concepts. I am going to go through some history and theory first…… 2D Spinnaker Design Traditionally, spinnakers were designed flat on the sail loft floor.

The Head Lets deal with the head first — lets assume we have to design a sail with a leech of 20m and a mid girth of 10m. The upper leech is running down a Geodesic — the line of the shortest distance between two points on a sphere. The girth is 10m also, so that is 90 degrees from one line of longitude to the other — this is the position for the other upper leech of the sail.

This concept can be thought of as cutting an orange into a quarter — the head of spinnaker. Of course this only gives one half of the sail — we now need to consider the bottom half! It also has geodesics, with the same rules as before. To get a flatter sail, the head angle is reduced, therefore making the equator of the sphere get closer and closer to the foot of the sail But what happens if the Aspect Ratio is, say So as aspect ratio reduces the head angle should go up to have the same Vertical Mitre Curve.

Girth Much easier, as this is normally a rule enforced number. The first and important input after the sizes is the Luff Offset. This defines the initial curvature of the spinnaker. And then you must check the position of the head on the rig again!!! Camber Like all other sails, a spinnaker has sectional camber, which is best put in correctly now. This gives a sail that has proved fast and stable both on the water and in the Wind Tunnel. It is important however to understand that relationship.

Other program give you the choice, but you never use both at the same time! You use the girths to meet the rule requirements, which may alter things a lot.