Re: bent mast, they are all bent!

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GYXU > Kites, widsurfing, waterski > Re: bent mast, they are all bent! 29 May 2006 06:54:09

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Re: bent mast, they are all bent!
Sailquik 28 May 2006 07:32:32
	Hi Andy, Not all masts "take a set" but most do. Normally the 100% carbon race masts do not "set" as much as those with less carbon on them. When we had fiberglass masts, and aluminum masts nearly all of them would "take a set" in one direction or another. One of the things that almost ensures that your masts will "take a set" is leaving your rigs with full tension on them for long periods of time. It's always better to release the outhaul then slack off the downhaul on your rigs if you intend to leave them rigged overnite or for more than a few hours if you are not actually sailing them. When I used to use North masts, I always "aligned" the logo on the base section and top section with each other, then put the logos to the front of the luff sleeve. Over time, even the 100% Vipers seemed to take a very small set away from the logos as this was the direction I always bent them when rigging. Now I use a bit more random "orientation" with all my masts, and have noticed alot less "set" over time. If I do a multi- day demo, and leave the sails rigged, even with complete release of the outhaul and slacking off the downhaul a couple of inches (be careful here as if you leave cambered sails (and no cam free race sails like the Retro) with not enough tension to keep the battens from "poking" through the front of the luff sleeve, you can damage your sail or break the cams or battens) the masts will still take some degree of "set". Best policy is to de rig your sails and masts each nite, and not rig up sails you aren't going to use immediately. Rigs that lay horizontal on the beach suffer several times the UV damage per hour than rigs that are standing up and being actively sailed. For maximum sail life, and mast life and reliability, it's best to derig them when not in actual use. Also a UV impervious cover over any rigs you leave laying out in the sun will extend the life of your sails by years. Using a more random "orientation" of the mast to the luff curve has kept most of my masts pretty "bend free" and they actually seem to straighten themselves back out (memory in the plastic and fibers) if they get bent in a variety of directions, vs always being bent in the same direction. Hope this helps, aprevelige@yahoo.com wrote:> Okay, I was putting together my mast the other day and the mast when> assembled had a clear bend to it. It seems that the mast is bent at> the joint as well as on the bottom where the extention levers against> the mast when rigged. Both the top and bottom are out of round.> Depending on how I assemble them, the bent is large (both the top and> bottom curve are aligned for max bend) or small. So, I thought I had a> defective mast and since it is just about 2 years old, I call NP and> they say take a picture and email to their warranty site.> While working to take a picture, I start looking at other masts when> assembled. It seems that they all have the same slightly blown out> points as noted above. I call my friend and tell him what I see, so he> checks his masts and finds the same bend.> So, it seems that mast material stretches out, which must untimately> lead to failure.> Has anyone else observed this? Take a look at your masts when> assembled and let me know> Andy>
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Charles Jutkins 28 May 2006 11:24:54 [ permanent link ]
	I have heard the way to fix this is to tape the mast at the joint between top and botton. then with the mast in the sail attach the boom such that the bend is oposite what it would be in the set direction and then downhaul the sail . This causes the bend to be reversed helping to take out the set. <aprevelige@yahoo.com> wrote in message news:1148778724.675588.290540@38g2000cwa.googlegroups.com...> Okay, I was putting together my mast the other day and the mast when> assembled had a clear bend to it. It seems that the mast is bent at> the joint as well as on the bottom where the extention levers against> the mast when rigged. Both the top and bottom are out of round.> Depending on how I assemble them, the bent is large (both the top and> bottom curve are aligned for max bend) or small. So, I thought I had a> defective mast and since it is just about 2 years old, I call NP and> they say take a picture and email to their warranty site.> While working to take a picture, I start looking at other masts when> assembled. It seems that they all have the same slightly blown out> points as noted above. I call my friend and tell him what I see, so he> checks his masts and finds the same bend.> So, it seems that mast material stretches out, which must untimately> lead to failure.> Has anyone else observed this? Take a look at your masts when> assembled and let me know> Andy>
		Add comment


Bob A. 29 May 2006 06:54:09 [ permanent link ]
	I remember some years back when Gulftech masts had a white line at the bottom. You were supposed to insert the mast into the sail with the line forward. The top section was always in the same orientation with the bottom due to an angled ferule joint that could only be assembled one way. In this manner you were supposed to get symmetrical performance from the mast regardless of what tack you were on. They called it the "neutral axis" or something like that. I think these masts had a predetermined neutral axis due to the manufacturing process. And after rigging these masts the same way every time of course any set was going to be aligned with your sail's luff too. Makes sense to me that a mast's natural set should be aligned with the luff curve so that the bending loads from the wind are not resisted differently for port tack versus starboard tack. I also like the idea of inserting the mast the same way every time for fiber fatigue reasons. Seems to me that if you've got a mast with a set in it, that means the mast fibers at the front of the luff have stretched a little beyond where they can spring back to neutral. Trying to take this set out by bending the mast along a different axis may make all those nicely/gracefully aligned helical mast fibers become slightly "squiggly". Same kinda thing went on with the older radial tires it you reversed the side of the car a tire was on. That tire would eventually become out of balance and be prone to early failure. Just my two cents. --Bob A. "Charles Jutkins" <ctuna@surfnetusa.com> wrote in message news:O6WdnVmBNdbUzeTZnZ2dnUVZ_vmdnZ2d@surfnetusa.com...> I have heard the way to fix this is to tape the mast at the joint between> top and botton.> then with the mast in the sail attach the boom such that the bend is oposite> what it would be in the set direction and then downhaul the sail . This> causes the> bend to be reversed helping to take out the set.> <aprevelige@yahoo.com> wrote in message> news:1148778724.675588.290540@38g2000cwa.googlegroups.com...> > Okay, I was putting together my mast the other day and the mast when> > assembled had a clear bend to it. It seems that the mast is bent at> > the joint as well as on the bottom where the extention levers against> > the mast when rigged. Both the top and bottom are out of round.> > Depending on how I assemble them, the bent is large (both the top and> > bottom curve are aligned for max bend) or small. So, I thought I had a> > defective mast and since it is just about 2 years old, I call NP and> > they say take a picture and email to their warranty site.> > While working to take a picture, I start looking at other masts when> > assembled. It seems that they all have the same slightly blown out> > points as noted above. I call my friend and tell him what I see, so he> > checks his masts and finds the same bend.> > So, it seems that mast material stretches out, which must untimately> > lead to failure.> > Has anyone else observed this? Take a look at your masts when> > assembled and let me know> > Andy> >
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GYXU > Kites, widsurfing, waterski > Re: bent mast, they are all bent! 29 May 2006 06:54:09

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Re: bent mast, they are all bent!

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