| Re: Self tacking jib track
[Re: yurdle]
#210767 05/11/10 08:31 PM 05/11/10 08:31 PM |
Joined: Jun 2001 Posts: 1,911 South Florida & the Keys arbo06
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Posts: 1,911 South Florida & the Keys | OK, debate.... Curved or straight?
With the straight traveler, as the pressure increases it sheets the jib, is that a disadvantage?
Eric Arbogast ARC 2101 Miami Yacht Club | | | Re: Self tacking jib track
[Re: arbo06]
#210995 05/13/10 07:08 PM 05/13/10 07:08 PM |
Joined: Mar 2006 Posts: 337 Arizona AzCat
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Posts: 337 Arizona | Straight track dosnt work worth a s#$%! Curved track rules. cANT GET SHEET TENSION WITHOUT CUTTING OFF THE SLOT. I wasnt yelling. As far as using the 1x1x1/8 SQ stock for supports, I had what I had, so I used it. Worked great, If you come up w a better option, it's your boat.
I have some great pics. if someone tells me how to post them, I will.
As long as the 1x12's are cut square, the sq stock stays in pretty well. I had a plastic mallet to tap it around a little if it started to move up or down.
OH, IT HAPPENED ALL RIGHT!!!
Auscat MKV 444 A class NACRA I-20- 440/CATHATKA | | | Re: Self tacking jib track
[Re: yurdle]
#210996 05/13/10 07:20 PM 05/13/10 07:20 PM |
Joined: Mar 2006 Posts: 337 Arizona AzCat
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Posts: 337 Arizona | I'm somewhere between 'Greatest. Post. Ever.' and 'Pics or it never happened.' Extremely informative and interesting.
The aluminum stock - that's a square tube, right? The base pieces for the connections to the beam in the last part - can they rotate and put the supports in a bind if the goop lets go? or do they have more than 1 rivet apiece? Your Hail Mary - compressing the tube - Did you have any way to secure it in the clamp? I'd be concerned about it popping out (or snapping) given too much pressure. Did you consider welding (or having someone else weld) the extra stock to the curved support instead of using the spreaders?
Thanks! I used 2 rivets for each. Its very important to make sure that the holes are all lined up straight, square, etc. also, remember that you have camber in the main beam. mines not perfect as if it were made at a factory, but its pretty close and works awesome!! BTW, if someone can tell me how to get this screen to show what i am typing, it would help a lot with the coherancy of my post. I have to scroll down every time I hit a key to see what I just wrote. I guess I could cutand paste from word.
Auscat MKV 444 A class NACRA I-20- 440/CATHATKA | | | Re: Self tacking jib track
[Re: AzCat]
#210997 05/13/10 07:22 PM 05/13/10 07:22 PM |
Joined: Aug 2007 Posts: 70 ButchG
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Posts: 70 | Great write-up AzCat. . .THANKS!! (putters off to the shop)
"There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."
ButchG Prindle 19 w/Spi | | | Re: Self tacking jib track
[Re: ButchG]
#212290 05/30/10 11:41 PM 05/30/10 11:41 PM |
Joined: Mar 2006 Posts: 337 Arizona AzCat
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Posts: 337 Arizona | facebook Here are some pictures of the self tacker.
Last edited by azcat; 05/30/10 11:44 PM.
Auscat MKV 444 A class NACRA I-20- 440/CATHATKA | | | Re: Self tacking jib track
[Re: AzCat]
#212299 05/31/10 06:56 AM 05/31/10 06:56 AM |
Joined: Nov 2005 Posts: 807 Hillsborough, NC USA Isotope235
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Posts: 807 Hillsborough, NC USA | BTW, if someone can tell me how to get this screen to show what i am typing, it would help a lot with the coherancy of my post. I have to scroll down every time I hit a key to see what I just wrote. I guess I could cutand paste from word. I have the same problem, and have taken to composing my posts with Notepad, and pasting them in. Regards, Eric | | | Re: Self tacking jib track
[Re: davefarmer]
#212347 06/01/10 09:21 AM 06/01/10 09:21 AM |
Joined: Jan 2009 Posts: 5,525 pgp
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Posts: 5,525 | there is a set of arrows in the upper R.hand corner. Arrow down for additional blank screen. Still a pita, but this will help.
Pete Pollard Blade 702
'When you have a lot of things to do, it's best to get your nap out of the way first.
| | | Re: Self tacking jib track
[Re: Isotope235]
#212358 06/01/10 10:48 AM 06/01/10 10:48 AM |
Joined: Jun 2002 Posts: 1,658 Florida Suncoast, Dunedin Caus... catman
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Posts: 1,658 Florida Suncoast, Dunedin Caus... | Look at the address bar to the right. If your using IE you'll see a broken page icon. Click on that before you start typing and it will fix the problem. Some times you have to click it twice to get the compatibilty view to work. That solved the problem for me anyway.
Have Fun
| | | Re: Self tacking jib track
[Re: SGalway]
#212463 06/02/10 01:30 PM 06/02/10 01:30 PM |
Joined: Mar 2006 Posts: 337 Arizona AzCat
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Posts: 337 Arizona | Im glad that worked for you. Did you have a chance to check out the pictures I linked? I was afraid that I might snap the track, but it bent fine. When I bent it, I made sure that the radius was pretty constant throughout the length of the track. I think I used 5 or 6 clamps.
Auscat MKV 444 A class NACRA I-20- 440/CATHATKA | | | Re: Self tacking jib track
[Re: SGalway]
#212481 06/02/10 09:28 PM 06/02/10 09:28 PM |
Joined: Jun 2001 Posts: 1,911 South Florida & the Keys arbo06
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Posts: 1,911 South Florida & the Keys | OK... I am still stuck on whether the staight track might be more "automatic" than a curved track. Think about it for a minute. As the pressure increases, the jib is forced to leeward. If the track is straight, the jib auto flattens. With a curved track, it will retain a belly.(?) I am knot an engineer but I do seek to understand.
Eric Arbogast ARC 2101 Miami Yacht Club | | | Re: Self tacking jib track
[Re: arbo06]
#212482 06/02/10 09:40 PM 06/02/10 09:40 PM |
Joined: Apr 2004 Posts: 713 WA, ID, MT davefarmer
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Posts: 713 WA, ID, MT | Hey Eric, My experience with a straight track(Reynolds 21) was that when you sheeted the jib hard to flatten the sail for upwind work, the clew would move towards centerline because the distance between the jib car and the jib's tack is shorter the closer the car gets to the mast. This would close off the slot too much. This is mostly a problem in ligher air, when it's blowing harder there can be enough pressure to force the clew outboard. With the curved track, you can sheet hard or soft without the tension influencing the clew position relative to centerline, as the distance between jib tack and jib car is always the same. This allows jib shaping with sheet tension without changing the clew location. That make sense?
Dave
Last edited by davefarmer; 06/02/10 09:51 PM.
| | | Re: Self tacking jib track
[Re: cyberspeed]
#212509 06/03/10 10:11 AM 06/03/10 10:11 AM |
Joined: Nov 2003 Posts: 99 Chicago, IL Krisu13
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Posts: 99 Chicago, IL | On my N20 I have curved track. How do you adjust how far your traveler can go? I currently have piece of line attached to mast rod under the ball. However it takes some time for me to adjust it.
Thx Kris
I20
| | | Re: Self tacking jib track
[Re: Krisu13]
#212517 06/03/10 12:08 PM 06/03/10 12:08 PM |
Joined: Mar 2002 Posts: 984 2017 F18 Americas Site Dan_Delave
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Posts: 984 2017 F18 Americas Site | On my N20 I have curved track. How do you adjust how far your traveler can go? I currently have piece of line attached to mast rod under the ball. However it takes some time for me to adjust it.
Thx Kris On the Formula 18s there is a jam cleat with an eye on the spinnaker pole. You would tie a line to the traveler car like you do now but on the other side (front) then adjust with the cleat. Dan | | | Re: Self tacking jib track
[Re: Krisu13]
#212518 06/03/10 12:18 PM 06/03/10 12:18 PM |
Joined: Jan 2008 Posts: 3,655 Portland, Maine ThunderMuffin
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Posts: 3,655 Portland, Maine | On my N20 I have curved track. How do you adjust how far your traveler can go? I currently have piece of line attached to mast rod under the ball. However it takes some time for me to adjust it.
Put a eyestrap centered on the beam right in front of the mast ball. Offset a small cam cleat somewhere on the front beam close to the center - opposite side as where your spin halyard cleat works. Run a line from cam cleat, to center eyestrap to the traveller car. Its a "travel limiter" in much the same way as the main traveller is. | | |
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