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Riding Sail

7899 Views 24 Replies 13 Participants Last post by  chip
2
Chris Parker forecasted 20 gusting 25 yesterday, so thought I'd try the riding sail here in Big Majors Spot in the Bahamas. I recorded the true and the apparent wind, both speed and direction. I also put a dynamometer on the anchor snubber to monitor the pull on the anchor. The riding sail was set on the backstay and sheeted to the port staysail lead block then back to a cabin top winch. The triangular sail is about 6'-6" along the backstay and 7'-6" on its foot. The water was almost calm in this protected spot.

Here are the recordings:





I put the riding sail up at about the 45 minute mark, had some trouble with the hoist until the 40 minute mark, then all was well.

The riding sail cut the swing in relation to the wind from +/- 30 degrees to +/- 15 degrees, and maybe half of that was due to the true wind variation.

The force on the anchor did not seem to change much, but I had to stand on the bow to read the dynamometer dial, and I quickly tired of doing that. The average force was perhaps 80 lbf and the maximum (the gauge has a tell tale) was 195 lbf.

Bill Murdoch
1988 PSC 34
Irish Eyes
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This past summer, I made a "block" part way up the backstay using a piece of rope and a knot similar to a prussic knot. The line that tightened it had a loop in it. I slid it up into position using 2 dock poles taped together for extra reach. I had it pre-strung with a halyard before doing so.

That setup worked really well. We have a cleat on the backstay 12" above head level, so that served to secure the halyard at the bottom. the halyard was tied into a big loop, so there was no way it could get unthreaded from the top loop.

When not in use, we kept the riding sail connected, but rolled-up and lashed to the backstay.

To raise, run the riding sail's "sheet" loosely to the winch on the mast. Un-lash the sail from the backstay. Loosen the halyard on the cleat, raise the halyard. Cleat firmly in place. Then tighten the "sheet" on the winch on the mast.

Regards,
Brad
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We use a regular flat sail. Toward the end of the summer, we ran the sheet for it forward to the midships cleat. That kept it angled to the wind and applying "straightening force" when the bow is into the wind so the hulls is providing no "straightening force". It minimized the "tiny tacking" of the anchor sail that occurs otherwise.

Net effect is likely similar to using a V sail.

Regards,
Brad
...Bill Murdoch
1988 PSC 34
Irish Eyes
Bill,

Happy St. Patricks Day!

Regards,
Brad
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