| Re: main sail issues
[Re: David Ingram]
#153323 08/25/08 03:13 PM 08/25/08 03:13 PM |
Joined: Dec 2001 Posts: 5,590 Naples, FL waterbug_wpb
Carpal Tunnel
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Carpal Tunnel
Joined: Dec 2001
Posts: 5,590 Naples, FL | I thought 700-800 lbs of tension was the top end of the scale for my N20 (carbon mast).
Higher diamond tension would (I guess) reduce the leeward bend of the mast under tension (at least up to where the diamonds meet the mast) as well, no?
Jay
| | | Re: main sail issues
[Re: WindyHillF20]
#153325 08/25/08 03:20 PM 08/25/08 03:20 PM |
Joined: Jul 2001 Posts: 851 US Western Continental Shelf hobiegary
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old hand
Joined: Jul 2001
Posts: 851 US Western Continental Shelf | Is there a way to induce the bend and then tighten the wires to hold it? Yes there is, but you go about it sort of backwards from the way you stated it. The process goes something like this: With the mast already tensioned, remove the diamond wire on one side by pulling with two hands and pushing the diamond spreader portion of the mast with one or two of your feet. Two if seated, one if standing. Tighten up the wires some more (make a guess) and then use the same bowing technique to replace the diamond wire onto the spreader tip. Measure and repeat as necessary. <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" /> Turning the turnbuckles when they are fully loaded is asking for galling and seizure in the turnbuckle bolts. GARY
Santa Monica Bay Mystere 6.0 "Whisk" <--- R.I.P. | | | Re: main sail issues
[Re: SurfCityRacing]
#153326 08/25/08 07:46 PM 08/25/08 07:46 PM |
Joined: Nov 2003 Posts: 749 Santa Cruz, CA SurfCityRacing
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old hand
Joined: Nov 2003
Posts: 749 Santa Cruz, CA | 800-1000 lbs? I am not sure my mast could take that load at the rotator bolt... Like I said... The diamond wires, spreaders and attachment points are not designed for it. You may have to rig up a diamond wire/ spreader set-up like on the Tiger. | | | Re: main sail issues
[Re: mikekrantz]
#153327 08/25/08 07:52 PM 08/25/08 07:52 PM |
Joined: Aug 2005 Posts: 2,921 Michigan PTP
Carpal Tunnel
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Carpal Tunnel
Joined: Aug 2005
Posts: 2,921 Michigan | A few years back, Mitch Booth showed Dave and I how to tune our Tiger mast to match the luff curve of the main. He had us flip the boat on it's side, connect the main on the halyard hook, connect the downhaul, and mainsheet and sheet in hard as though you were going up wind. Note - the main is not in the luff track, it is outside the mast. Look at the luff curve of the sail, and compare it to the curve of the mast track. Adjust your diamonds and spreader rake accordingly to get them to match. That is your new "base setting". We found that we were carrying anywhere from 800 to 1,000 lbs of diamond tension to get some mainsails dialed in. Question: You only want the curve of the mast to match the luff curve when the downhaul is maxed out, correct? If you made it so that the mast had the luff curve at no downhaul then wouldn't downhauling do nothing to depower the sail? because the sail would be board flat to start with. | | | Re: main sail issues
[Re: PTP]
#153328 08/25/08 09:08 PM 08/25/08 09:08 PM |
Joined: Mar 2006 Posts: 1,246 Orlando, FL tback
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veteran
Joined: Mar 2006
Posts: 1,246 Orlando, FL | When one does a diamond wire adjustment, do you care whether the endcap that holds the diamond wire at the spreader is loosened?
USA 777
| | | Re: main sail issues
[Re: PTP]
#153331 08/26/08 04:34 PM 08/26/08 04:34 PM |
Joined: Mar 2006 Posts: 1,246 Orlando, FL tback
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Joined: Mar 2006
Posts: 1,246 Orlando, FL | I assume you are talking about the little screws that pinch the wire on the spreader tips. Yes, those...just thought it would be easier if you didn't have to adjust those, then you wouldn't [necessarily] have to put your boat on its side.
USA 777
| | | Re: main sail issues
[Re: PTP]
#153332 08/26/08 08:18 PM 08/26/08 08:18 PM |
Joined: Nov 2002 Posts: 606 League City, TX flumpmaster
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addict
Joined: Nov 2002
Posts: 606 League City, TX | I assume you are talking about the little screws that pinch the wire on the spreader tips. I would loosen them and keep an eye on how much adjusting the tension on the diamonds deflects the spreaders. you will have to bang them up or down the diamonds a little to recenter them after you have changed the tension. I went through this on my 6.0 but there was no captive mechanism - other than a slot- on the spreader tips. After it was all set, you use seizing wire. If you wind up your wires to 900lbs of tension then banging on the spreaders is probably a bad idea - you want to keep them in compression and not deflect them out of column with all that force on them. You can set up the spreaders so they are pointing up slightly, and they then come back perpendicular to the mast when you apply full tension to the diamond wires. | | |
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