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Old 24-10-2017, 07:33   #16
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Re: Lagoon 42 loses mast

Quote:
Originally Posted by jugga View Post
And the video BlueBuddha is referring to is not really a Lagoon 42 promo, but made by a german crew on a 400. I'm still having doubt on all the given numbers in that video ... Did you see and hear that wake ?! Crazy !
hmm, The boat on the video I was referring to is not a 400, it is clearly a new L42. We may be talking about a different video. I met one of the crew at the Annapolis show who was on the boat when the video was shot in the Bahamas. They were flying the kite in 24knts of wind and reached speeds of 16knts. At least that is the report.

I do agree that the stays were likely very loose and I hope now Lagoon reconsiders the size of the mast foot.
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Old 24-10-2017, 07:54   #17
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Re: Lagoon 42 loses mast

You're right BlueBuddha, we must be talking about different videos then. The one I've seen is this one :
https://youtu.be/rmKWwCUEOsQ
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Old 24-10-2017, 08:26   #18
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Re: Lagoon 42 loses mast

My step is a bit shallow also.
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Old 24-10-2017, 10:39   #19
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Re: Lagoon 42 loses mast

I'd agree the shrouds must have been slack but also that step appears inadequate. JMHO
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Old 24-10-2017, 10:54   #20
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Re: Lagoon 42 loses mast

The owner posted a video of him flying the parasailor with 21 knots of wind.

The parasailor puts lots of upward pressure on the rigging. In fact, one of the benefits stated in marketing materials is that it keeps the bow from digging into the waves when surfing.

My question to the owner as to whether he was flying the parasailer when the mast came down was deleted.



I could see a perfect storm.
- Boat flying the kite in 20+knots
- Rigging loose
- Step shorter that it should be
= lost of mast.
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Old 24-10-2017, 11:29   #21
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Re: Lagoon 42 loses mast

Quote:
Originally Posted by BlueBuddha View Post
The owner posted a video of him flying the parasailor with 21 knots of wind.

The parasailor puts lots of upward pressure on the rigging. In fact, one of the benefits stated in marketing materials is that it keeps the bow from digging into the waves when surfing.

My question to the owner as to whether he was flying the parasailer when the mast came down was deleted.



I could see a perfect storm.
- Boat flying the kite in 20+knots
- Rigging loose
- Step shorter that it should be
= lost of mast.
I had the same thought. I've seen several Lagoon mast steps and the newer ones, like the one pictured on the 42, seem too shallow. The forces mentioned could, IMHO, cause a mast to be lost.
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Old 24-10-2017, 12:19   #22
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Re: Lagoon 42 loses mast

Have you considered 'flex ' in the mast step cross beam ? I comment because my old Crowther , when hard on the wind, noticeably slackened the lee rigging.Crowther's mast step fitting was approx 75mm nest and thru' bolted to the mast.
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Old 24-10-2017, 12:44   #23
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Re: Lagoon 42 loses mast

As a monohull guy, the lack of lowers on catamarans always makes me nervous. The mast is just a wet noodle if something goes wrong with the diamond stays or jumpers. I could easily see it lifting a few inches. I'm among those who think that the Gunboat 55 lost her rig because the middle of the mast "whipped" fore and aft when the boat first accelerated in the micro burst (or whatever) and then decelerated as it buried the bow into the back of the next wave. Of course, we'll never know.

How many people tune and inspect their diamond stays as carefully as the main shrouds? Hard to do without going up in the chair.
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Old 24-10-2017, 13:01   #24
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Re: Lagoon 42 loses mast

I need to have opinions- How do you check a rig for tension , in a cruising situation? My original rigger , Allyacht Brisbane ,carries out a professional inspection every 2 years but after a tough passage I went up in the bosun's and ' discovered' one ( out of 10) diamond stays not resonating like a bow string .Clearly needs a tightening " until it rings ". Is there a better way of judging tension ?
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Old 24-10-2017, 13:15   #25
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Re: Lagoon 42 loses mast

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Originally Posted by jugga View Post
You're right BlueBuddha, we must be talking about different videos then. The one I've seen is this one :
https://youtu.be/rmKWwCUEOsQ
I like this one

https://youtu.be/RlQcTerEs_U
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Old 24-10-2017, 14:10   #26
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Re: Lagoon 42 loses mast

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Originally Posted by BobFord View Post
I need to have opinions- How do you check a rig for tension , in a cruising situation? My original rigger , Allyacht Brisbane ,carries out a professional inspection every 2 years but after a tough passage I went up in the bosun's and ' discovered' one ( out of 10) diamond stays not resonating like a bow string .Clearly needs a tightening " until it rings ". Is there a better way of judging tension ?
Pro riggers usually tune by experience and feel...for the rest of us, there are tension gauges. "Till it rings"...is very tight...that would concern me...you can cause problems by over tensioning too.

A tension gauge, and the recommended numbers for your rig, are one way to do this.

For diamonds especially it is very important they are tuned symetrically or the mast will not be true.
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Old 24-10-2017, 14:53   #27
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Re: Lagoon 42 loses mast

http://loosnaples.com/tension-gauges
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Old 24-10-2017, 17:42   #28
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Re: Lagoon 42 loses mast

I don't see how the parasailor puts upward pressure on the rigging. The halyard angles down to the head of the sail. That would be contrary to the "can't push a rope" theory.?
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Old 24-10-2017, 17:49   #29
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Re: Lagoon 42 loses mast

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Originally Posted by Library70 View Post
I don't see how the parasailor puts upward pressure on the rigging. The halyard angles down to the head of the sail. That would be contrary to the "can't push a rope" theory.?
You are assuming that the head of the sail will always be below the halyard block. That is not always true with the Parasailor.
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Old 24-10-2017, 17:50   #30
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Re: Lagoon 42 loses mast

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Originally Posted by Library70 View Post
I don't see how the parasailor puts upward pressure on the rigging. The halyard angles down to the head of the sail. That would be contrary to the "can't push a rope" theory.?


You are right. The upward pressure is unlikely at the mast. I saw some pics where the kite is flying so high that the head is above the mast, but most often is below. I think the likely relevant pressure is forward leading to inversion.
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