Tuning Guides

Moderator: GreenLake

Tuning Guides

Postby prochase » Sat Dec 12, 2020 12:29 pm

I plan on racing next year. Does anyone have a North or other sail manufacturer's tuning guide?

Thank you,

Eric
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Re: Tuning Guides

Postby jalmeida51 » Sat Dec 12, 2020 4:35 pm

I have a North and a DieBall tuning Guide. I Googled Daysailer 1 Tuning guide. I couldn't find the one for Doyle.
Hope this helps, John
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Re: Tuning Guides

Postby tomodda » Mon Dec 14, 2020 4:09 pm

Internet WayBack Machine to the rescue, I've pasted the Doyle DS Tuning Guide from 2006 below the break. Here's the links for the other two guides:

http://feverj.org.br/Classes/DaySailer/2012%20Day%20Sailer%20Tuning%20Guide.pdf
https://www.northsails.com/sailing/en/resources/daysailer-tuning-guide

Also of interest:

http://members.tripod.com/~daysailers_colorado/tuningguide.html

Happy sailing!

Tom


--------------------------------------------------
SETTING UP YOUR DAYSAILOR FOR DOYLE/CURTIS SAILS

BEFORE STEPPING THE MAST:

1. Make sure turnbuckles are clean and turn easily.

2. Make sure spreader adjusters are clean and turn easily.

3. Tape or tie a string to the tang or the upper end of each shroud. Strings should be slightly longer than the shrouds. Taping, rather than tying the strings, will allow them to be pulled off later without removing the mast.

AFTER STEPPING THE MAST:

1. Put the boat in the water and adjust the headstay, shrouds and mast foot so that the mast rakes slightly aft from vertical.

2.. If the mast can move more than 1/8 inch fore and aft in the mast partner (deck opening), wedge the front of the mast to remove the play.

3. Center of plumb the mast by adjusting the shrouds with the empty boat in the water. Check by dropping a plumb bob from the main halyard or by taping a level to the side of the mast and reading it from the dock.

4 Tension shrouds and headstay so there is NO slack. If you use a tension gauge, a Loos model A should read about 50 pounds. Sight up the mast to make sure there is no fore, aft, or sideways curvature.

5. Take the strings attached to the top of the shrouds. Bring each one down leading it aft of the spreader and tie it to the outer end of the clevis pin in the chainplate. Each string will now be a straight line from the top of the shroud to the bottom.
6. Adjust each spreader so that its aft edge is 1" forward of the straight line described by the string. The outer end of the spreader should be 1 1/2" to 2" outside of the string line.

SETTING THE MAST RAKE AND BALANCE:

1. Sail the boat upwind in 4-6 knots of wind. Sails should be trimmed normally for upwind legs. Skipper and crew should be in their normal positions and should keep the boat FLAT. The cunningham should be off and the centerboard should be all the way down.

2. Release the tiller so the boat steers itself. It should turn slowly into the wind.

3. If the boat goes straight or turns downwind, lengthen the headstay, tighten the shrouds, and move the mast butt forward to increase mast rake. Again sight up the mast to make sure there is no curvature.

4. Repeat steps 2 and 3 until the boat turns slowly but steadily into the wind each time it is allowed to steer itself.

5. Recheck that mast is plumb and straight and shrouds and headstay are properly tensioned.

6. If the boat turns sharply into the wind the tiller is released and carries a heavy weather helm, reduce the mast rake by tightening the headstay and moving the butt back. This condition is unlikely.

SETTING THE MAST BEND:

1. This may take several tries in different wind conditions.

2. Sail the boat upwind with the traveler set to bring the boom to the center and the top batten parallel to the boom. Make sure the cunningham and vang are off. Look for diagonal wrinkles running from the center of the mast to the boom. These should begin to appear in about 8 knots of wind and become more prominent as the wind increases.

3. If the wrinkles appear in winds below 8 knots, the mast is bending too much. To correct this, sight up the mast while the boat is sailing. If most of the bend is in the upper part of the mast tighten the spreader adjusters slightly to push the ends of the spreaders forward. If most of the bend is in the lower part of the mast, move the butt forward. Don't change the length of the headstay as this will change the mast rake and the balance of the boat.

4. If the wrinkles do not appear at 8 to 10 knots, loosen the spreader adjustments and/or move the foot of the mast aft until the wrinkles do appear. Again do not change the headstay length.

5. Repeat steps 3 or 4 until the wrinkles appear at 8 to 10 knots.

6. When the mast bend is correct, recheck the shroud and headstay tension and the mast rake balance.

TRIMMING THE SAILS UPWIND

1. Boom should be on center and the top batten parallel to the boom. If the boom cannot be brought to center without cocking the top batten inward, pull the mid-boom traveler more to windward, or make the stern traveler triangle higher.

2. The outhaul should be moderately tight in light air and progressively tighter as the wind increases. In a drifter, a tight outhaul may help to loosen the leech of the main.

3. The cunningham should be used to keep the maximum draft point 50% back in the main. this will usually mean no cunningham up to 10 knots and progressively more cunningham in higher winds to remove most of the wrinkles.

4. Keep the vang off going upwind.

5. The jib leads should be barber-hauled in 15" to 18" from the outer edge of the cuddy in light air and eased off as the wind increases.

6. The jib luff should be tensioned so that small wrinkles appear along the luff in up to about 10 knots of wind. Above 10 knots increase the tension to remove most or all of the wrinkles. In chop and light air ease the luff to get more drive.

7. Keep both windward and leeward jib telltales flying whenever possible.

8. In heavy air, tighten the outhaul and cunningham and ease the traveler to allow the boom to go to leeward. Hike HARD. It is very important to keep the boat flat even if this means that much of the main is luffing.

SAILING OFF THE WIND

1. Centerboard up as much as possible.

2. Set the vang so the top batten is parallel to the boom.

3. Ease cunningham and outhaul.

4. Raise spinnaker pole until spinnaker clews are level.

5. Trim the spinnaker so there is 6 - 12" inches of curl in the luff.

6. Keep the pole perpendicular to the apparent wind.

7. While reaching, keep your speed up by heading higher in the light spots or choppy water. Head off only in the puffs and don't sail unnecessarily high early in the leg.

8. On the runs, jibe in the windshifts to stay on the headed tack.

OTHER HELPFUL HINTS

1. When in doubt, let it out.

2. Remember that you must change your trim or "shift gear" as conditions change. As you come into a light spot or a choppy spot, ease the main and jib slightly and bear off to power through. As the wind fills in or the chop subsides, trim in carefully and come back up to your proper course.

3. Keep centerboard, rudder and bottom in the best shape possible.

4. Get a good start, do not overstand marks or sail in another boat's bad air.

NOTE: These are guidelines not gospel. What is fast for your boat may vary slightly from our charts. Remember this is only a game we are playing. Have fun and good sailing. Special thanks to Dan Duggan for preparing this tuning guide.

Jud Smith or Dave Curtis
Phone: 781-639-1490 or 781-631-4735
Fax: 781-639-1497 or 781-631-7880
judsmith@aol.com




Doyle Sailmakers, Inc.
89 Front Street
Marblehead, MA 01945
Tel: 781-639-1490, Fax: 781-639-1497
E-Mail: info@doylesails.com
Webmaster: Adam Dexter
Dealer Dock
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Re: Tuning Guides

Postby Fly4rfun » Mon Dec 14, 2020 9:17 pm

Tom,
thank you for posting this information. very helpful to me.

G.
"Sail Aweigh" 1966 DS1 #2675
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Re: Tuning Guides

Postby prochase » Tue Dec 15, 2020 2:13 pm

Thanks guys!

Eric
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Re: Tuning Guides

Postby RobH912 » Sat Dec 19, 2020 11:30 am

When I now google North Daysailer Tuning Guide I get a good description from North, but not any pictures.

A couple of years ago I downloaded from North a 7 page tuning booklet from North with good pictures... cover looks like this... can not seem to find it again on line.

North Tuning Guide Image 12-19-20 at 8.14 AM.JPG
North Tuning Guide Image 12-19-20 at 8.14 AM.JPG (122.66 KiB) Viewed 6614 times


Would be happy to email the .pdf version of this booklet to anyone who is interested. Send me a PM with your email address.
Rob


DS1 #2444
Cape Cod
Eastham, MA
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Re: Tuning Guides

Postby GreenLake » Sat Dec 19, 2020 12:20 pm

For now, this link still seems to work: there's a "download" style button at the to of https://www.northsails.com/sailing/en/resources/daysailer-tuning-guide.

One of the pictures in it shows the jib sheets both rigged to the same side of the main; which is, I am sure, because it was taken on land just to demonstrate the barber inhaul. Still, amusing for a tuning guide :)

PS: be aware, there may be a difference in whether you access their site from a desktop or mobile browser. It depends on the site.
~ green ~ lake ~ ~
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Re: Tuning Guides

Postby RobH912 » Sat Dec 19, 2020 7:15 pm

GL - yes thanks for that link.

I now realize that I was clicking on the Print PDF button which removes all of the pictures, should have been clicking on the PDF button to the left of print.

You could just remove my post.

Thanks
Rob


DS1 #2444
Cape Cod
Eastham, MA
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Re: Tuning Guides

Postby GreenLake » Sat Dec 19, 2020 8:37 pm

Rob, it is what it is. Anybody following along will be able to get to where they want to be, but this is not the Wikipedia. While it's nice that things are archived, we don't have to edit how we got there.

I'd like to add that, to a degree, all tuning guides are relative to the sailmaker's sail design. Things like mast bend interact with the cut of the sail, and a good sailmaker will give you a different sail for a tapered mast, for example.

Whether your own skills in sailing and trimming ever come to the point that those differences matter, is another question. I still have days where nothing seems to want to work, interspersed with days where I feel I totally get it.
~ green ~ lake ~ ~
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