MrWolf
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Posts posted by MrWolf
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Yea i was thinking water pressure.. Thinking aloud about what the effect of submerging a sealed tube but leaving half of it at atmospheric pressure would be.? The bottom of the tube still going to crumple or nope? Because fully submerged it wouldnt take alot of depth.
More thinking aloud, what does the Wolf weigh in at? The strain on the cordage would be primarily due to the positive bouancy and trying to re submerge below the centre of bouancy wouldnt it.
That damage is just awful, would be a shame to see it happen to the next one to go down side up.
Take a look at the damage, its on the hard at Okahu.
The area damaged isn't under water when it happens.
The furthest anything goes under the water righting it is only about 3 metres (possibly 5 psi), and there is no other damage to any other sealed hulls ?
Where as the damage is a classic egg shell compressive failure !
Plus I imagine in a water pressure explosion as soon as there is one small hole the pressure would equalise quite quickly ?
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if they righted it end over end then the arse would have sunk down when the bows came up, pressure built up in the hull then finally.. POP!
Wrong Jordan.
This was a compressive failure, we know this because the break is inwards.
Not an outward explosion like you describe.
There is a risk associated with "egg Shell" methods of construction such as Tortured ply, this is what happens when they fail.
If the hole were due to the pressure difference, it would be an inward break would it not.? Plausable explanation i think? I would never have expected a hole such as that, cracks and splits sure but that hole is interesting. I cannot work out how you would place those two surfaces under sufficient compressive load to do that damage, with out completly rooting the a fair bit more. Or to ppl who know, is that a familiar type?
Good luck with the repair.
What water pressure ?
The rope load is in excess of at least 6 tonnes due to the type of ropes they were breaking.
The beam (bridle attachment point) is only 2 metres infront of the boats centre of buoyancy (pivot point).
the way it failed is classic compressive failure, the hole you see on the site is only a baby compared with the outside.
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That is just the saddest sight! Hopefully not too much work to get her sailing again.
Looks like its going to be at least 3 months before wolfy is sailing again
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if they righted it end over end then the arse would have sunk down when the bows came up, pressure built up in the hull then finally.. POP!
Wrong Jordan.
This was a compressive failure, we know this because the break is inwards.
Not an outward explosion like you describe.
There is a risk associated with "egg Shell" methods of construction such as Tortured ply, this is what happens when they fail.
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[Mr Wolf,
Did they right the boat end over end or sideways?
Curious as to how the float saw so much compression
They righted it end over end.
The Main beam is quite far aft on Wolfy, so it has very little leverage just as its coming up, so I'd guess that's what caused it.
i don't know of any tri's righted sideways, they just drag across the surface of the water.
To stop it dragging they had two guys sitting on each float to hold it down so ther back would dig in, then after that happens the bow can lift out.
They broke some very heavy rope so i'd guess they are seeing in the region of 6 tonnes of load.
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excuse my ignorants
how did it turn turtle? just a wind gust? water looks very flat so I would not have thought it would have burred the nose into the back of a wave
They sent it, and it went arse over bow.
No waves were required just a plenty strong gust.
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Was the hole caused in the impact with the water in the capsize, or beforehand? seems pretty nasty!
Best of luck getting her back on the water, The Wolf always looks good out there!
The hole was caused as the boat was being righted, and it caused by the massive amount of compression between the centre of buoyancy and the beam on which the bridle was attached.
The boom also only broke at the very last instant of being righted.
The outside of the boat the hole is the full side of the boat around 2m long and is far worse than the photo's on the site.
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For the life of me I cannot see why Fullfoil is making comments such as those.
I am very grateful for all the help in getting wolfie upright again.
Adam and Russell off Taeping went out of their way to help the Coastguard who were just awesome.
No one should criticise any of the crew, they have all the sailed the boat many times before. I had complete faith in them when I lent them my boat, and I am even more impressed by all of their characters right now, I couldn't have left my boat in better hands.
In Kate we are very lucky to have a super experienced multihull crew who punches miles above her weight and is very willing to get in and do all the dirty jobs. She puts most guys I've ever sailed with to shame, and there isn't another multi out there that wouldn't jump at the chance to have her sail with them.
wolfy is a brute of a boat in those conditions and that is what I love about him.
It is very challenging to push it hard enough to be fast but stay within safe bounds. The Coastal start is a highlight where Wolfy was just on FIRE !
The multi club is a great bunch of guys who band together tightly in times of adversity. The offers of help have been fantastic. I wouldn't want to be doing anything else.
BTW, we won our Badminton tie in Whangarei !
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For what its worth, there is some good advice on here.
Basically the Nova was designed with the large overlapping genoa you currently have.
It needs that sail to get performance in lighter airs.I think a lot of sailing in Auckland is done in less than 15 knots and hence that big genoa will more than pay its way.
As the breeze increases you can get away with a number 2, similar hoist, shorter foot.
I think the correct solution is not so much to cut down the old sail size (as you can probably do with the power in a majority of the sailing you are likely to do) but rather to make the furled sail a lot more efficient.
The padded foam (or whatever) is the solution to that.
In the short term I'm sure you can retrofit that system to your existing sail to try to improve the furled shape.
timberwolf
in MarineTalk
Posted
Its not the ideal time to be making comments such as these.