Can anyone share some good pictures of the bridle foil for the 5.8 or 6.0? I plan on fabricating one using parts from the hobie beams/dolphin striker for my 5.7.
I found several but they are a little fuzzy.
I also want to know if the foil is solid or elliptical hollow tube? Hard to tell from the pictures I found. Thanks in advance for responses and feedback.
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Zach
Yorktown, VA
1984 Nacra 5.7
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Nacra Bridle Foil help
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Posted: Aug 13, 2013 - 11:28 AM
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Posted: Aug 13, 2013 - 12:06 PM
it is definitely not a solid extrusion as the end caps fit inside of it in the same fashion the end caps fit on your nacra beams.
if i find a reason to head over to my brother's house i'll take some pictures of mine.
Edited by matt922 on Aug 13, 2013 - 12:07 PM. -
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Posted: Aug 13, 2013 - 03:37 PM
Zach,
I can get you some pics. The kingpost (striker) on the foil is stainless female threaded rod, with a male SS treaded rod to adjust prebend. The V shape SS rod is attached over the kingpost and terminates at the end into SS tangs. The factory foil is an asymmetrical extrusion, but the complete design is very robust and can accommodate tremendous loads. For starters, look in my album and you can see several pictures. If you need more I can email you some high resolution pics directly.
http://thebeachcats.com/pictures/?g2_itemId=18279
Here are some pics you might find helpful
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Philip
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Posted: Aug 14, 2013 - 11:10 AM
P.M.
Those are great pictures and information. I do have a couple requests.
1) What is the length of the foil for a 5.8?
2) Can you get a good close up picture of the foil ends and also a close up of the kingpost(striker)?
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Zach
Yorktown, VA
1984 Nacra 5.7
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Posted: Aug 16, 2013 - 09:42 AM
Hopefully I don't end up hijacking this thread but at the risk of asking a dumb question, could someone elaborate what the bridle foil's function is, how and why? I've heard that they increase pointing ability but I don't know how and it if is just the foil itself or adjustments that you make to it while sailing....
Also, found on a site trying to find more info that the foils are 70" long
http://www.catsailor.com/…=showflat&Number=176521)
Thanks
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Cesar (Cez) S.
Hobie 16 (had a few)
Nacra 5.2 "Hull Yeah"
Vectorworks XJ - A class (not named yet)
West Michigan (Grand Rapids/Holland Area)
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Posted: Aug 16, 2013 - 09:55 AM
Steve (on this forum) has the Original P19 MX and the difference in sail size & horse power from the regular P19 is impressive.
I am sure P.M. (or others) can fill in all the details of imploding cats in the 80's but i think Prindles were failing with the addition of bigger jibs and mains and needed to add strength in this part of the rigg.
adding a foil (often a mast section) or beam to the front of a catamaran will disperse the load that is pulling your bows inward
and by adding it it will also stiffen up the bows - reducing flex twist of the front beam (and hulls) which will reduce it in the middle and rear beam and recapture all the speed & pointing loss associated with flex.
Edited by MN3 on Aug 16, 2013 - 10:07 AM. -
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Posted: Aug 16, 2013 - 10:16 AM
The foil pulls up on the hull more than in. On your 5.2, if you went up your bridle wires from the hull 6 inches, chopped the off, put on a foil, you could:
1) keep the angle of the stress on the hull same
2) have a lower tack point for the jib, keeps the power low in the sail
3) have more room so you can add a larger jib.
The foil itself has nothing to do with pointing or speed.
The Nacra 5.5 SL and 6.0 NA were designed with the foil, the 5.8 adopted the foil and added a larger jib and became the 5.8 NA
I'll see if I can get some pics this weekend and measurement.
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Ron
Nacra F18
Reservoir Sailing Assn.
Brandon, Mississippi
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Posted: Aug 16, 2013 - 11:24 AM
All makes sense thanks guys, maybe I'll do that some day. Saw a 5.2 and a 5.5 earlier this week with them on and started wondering, once I saw this post I had to ask.
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Cesar (Cez) S.
Hobie 16 (had a few)
Nacra 5.2 "Hull Yeah"
Vectorworks XJ - A class (not named yet)
West Michigan (Grand Rapids/Holland Area)
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Posted: Aug 16, 2013 - 02:18 PM
x
Edited by MN3 on Aug 16, 2013 - 02:18 PM. -
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Posted: Aug 18, 2013 - 04:18 PM
I'll be happy to post pics of the progress/results when I get a chance. Just getting the parts I need first before I start fabricating it. 70" was what I guessed for the bridle foil length based on the measurements I took from my boat.
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Zach
Yorktown, VA
1984 Nacra 5.7
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Posted: Oct 24, 2013 - 10:39 PM
Hey Zach any progress on the foil, I want to fab one myself for my 5.8
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Carl
Dart 18x2
Nacra 5.8
Acat
Windrider Rave x2 for sale
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Posted: Oct 25, 2013 - 04:26 AM
The supercat design may be easier to manufacture at home. -
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Posted: Oct 25, 2013 - 06:19 AM
http://thebeachcats.com/pictures/?g2_itemId=106194
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Zach
Yorktown, VA
1984 Nacra 5.7
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Posted: Oct 25, 2013 - 06:30 AM
This was done using the H16 side bar, kingpost and rods. The rest we fabricated ourselves. I agree with carolinacatamarans - it would probably be easier to do the supercat design at home.
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Zach
Yorktown, VA
1984 Nacra 5.7
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Posted: Oct 25, 2013 - 11:31 AM
Zac your foil looks plenty strong, I will search for a photo of the supercat design
cheers
carl
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Carl
Dart 18x2
Nacra 5.8
Acat
Windrider Rave x2 for sale
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