This tuning guide has been put together by Ethan Bixby from North Sails in North America, who is the designer of our newest sails. The calibration scheme below does not reuse existing 505 sailing boat zip schemes. We have tried to develop a calibration scheme that supports the following:. Uses zero as the neutral, or basis datum setting. If that is not clear, the light air settings are on the negative side of the datum and the positive numbers are heavier air settings, finally forward is negative, aft is positive.

Measure from the back of the mast along the top of the CB cap, aft, over transom, to the aft most point of the hull it may be slightly aft Sailing Boats For Sale Windermere Zip of the transom. Ignore the rudder fittings. Note: 505 sailing boat zip aft end of the hull is where the class rule measurements are taken, not the actual face of the transom.

This value is more reproducable across different hulls. With no 505 sailing boat zip hoisted, connect a tape measure to the end of the jib halyard. Take the jib halyard or topping lift forward and measure from the end of the halyard at the same tension to the top of the rail at the bow.

This is the top forward part of the boat, regardless of where the headstay is. The shrouds should not be excessively tight, but snug. Mark that setting on the forestay tackle in the boat, where you can see it. For future reference record the distance from the eye to the fork pin to some reproduceable point on the boat.

This is the best repeater and easy to see! Mark one inch increments at additonal inches, i. Note: that the forward rake measurement is much less sensitive to mast bend, shroud tension, hull rocker, and height of transom.

Sight down lead lines on the jib clew. Move jib cars fore or aft until the jib sheet is lined up with the more vertical line. That is the standard power setting. Number holes with negative numbers forward from there, and positive numbers aft of that hole. The angled aft slightly closer to the horizontal line is for heavy air depowering when raked. In practice, you may not need to actually move the jib car for heavy air, as rake changes the lead angle for you.

You may need to move the jib lead aft for light air, flat water. With the jib still sheeted as. Mark a spot on the jib sheet that is clear of the cleat and turning blocks. You will be calibrating the jib lead tension based on that mark, so mark the corresponding point on the seat tank as. Pull board out and put it in 505 sailing boat zip down position.

Set the leading edge of the CB perpendicular to the bottom of boat at the centreboard trunk. Mark the head of the board perhaps aft end of the 505 sailing boat zip level with the top of the CB cap. Also mark a position with 505 sailing boat zip board as far down raked forward as possible. Also measure from the top of the centreboard to the aft end of the hull on the centreline. This measurement will result in different effects with different CB planforms.

I think what we are really trying to measure is where the centre of area or pressure is fore and aft and below the hull. Set the spreaders to Note: that this measurement is from the shrould to the closest part of the mast, along the spreader.

This measurement assumes that your spreaders are inches above 505 sailing boat zip level old US specs AND assumes your shroud chainplates and mast step locations 505 sailing boat zip the same as other boats.

If any of spreader bracket height, mast step position and shroud chainplate location are different on your boat, these measurements will not result in the same effects we.

We have a comprehensive measurement system to relate spreader height, hounds height, spreader details, and triangulation of the chainplates. Please contact us for this as it is a much better tool to obtain the actual deflections and angles.

Gosport, United Kingdom thomas. Cumbley northsails. St Petersburg, Florida Lin. Robson northsails. Adelaide, Australia sandy. Annapolis, Maryland Austin. Last Updated: August 23, Sandy Higgins Adelaide, Australia sandy. Austin Powers Annapolis, Maryland Austin.

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