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Old 19-09-2019, 09:51   #16
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Re: catamaran flipped in Auckland tornado

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Originally Posted by fxykty View Post
I wonder whether she will be a write off?
Update: Rosella is currently sitting in her regular berth in Westhaven with a "For Sale" sign hanging off the back.
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Old 19-09-2019, 19:00   #17
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Re: catamaran flipped in Auckland tornado

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Originally Posted by Seaslug Caravan View Post

Having learnt the hard way that during a decent gust the windage on a 2:1 halyard is enough to partially hoist the main, I have no intension of letting that happen again..
What boat?
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Old 22-09-2019, 00:00   #18
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Re: catamaran flipped in Auckland tornado

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Update: Rosella is currently sitting in her regular berth in Westhaven with a "For Sale" sign hanging off the back.

As-is or repaired? Does she have her rig? I donít have access to that dock unfortunately to look for myself.
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Old 22-09-2019, 10:21   #19
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Re: catamaran flipped in Auckland tornado

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As-is or repaired? Does she have her rig? I donít have access to that dock unfortunately to look for myself.
Only saw her from the water, from a distance. No mast, some obvious damaged stainless fittings, "For Sale" sign hanging off the back & visible from the channel, looking very "as is"
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Old 29-09-2019, 02:55   #20
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Re: catamaran flipped in Auckland tornado

If you look at the video frame by frame it looks like the sail was out, maybe it came loose and helped end for end the cat
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Old 29-09-2019, 03:01   #21
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Re: catamaran flipped in Auckland tornado

Yes, that was already stated earlier in the thread.
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Old 29-09-2019, 03:11   #22
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Re: catamaran flipped in Auckland tornado

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Yes, that was already stated earlier in the thread.
Thanks, missed that. It's a bit worrying seeing a lovely cat flip like that. I like to think it might not have if the sail didn't come out. Anyway who knows.
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Old 29-09-2019, 03:23   #23
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Re: catamaran flipped in Auckland tornado

It has been mentioned in other threads too about mainsails stowed in stack pack type arrangements subsequently coming loose and partly hoisting accidentally in thunderstorm or microburst type weather.

One monohull was knocked down in a microburst because of this.

Mainsails in stack packs should still be physically secured with sail ties, and the main halyard itself should be physically secured down too.

There are a few options and different ways to do this.

I think that it's basic seamanship to always secure such things but it is clear from many comments in other threads that it is common not to do this, or at most to just rely on the stack pack zipper.

This is insufficient.

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Old 29-09-2019, 06:01   #24
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Re: catamaran flipped in Auckland tornado

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Thanks, missed that. It's a bit worrying seeing a lovely cat flip like that. I like to think it might not have if the sail didn't come out. Anyway who knows.
What amazed me was it didnt just flip it was absolutely thrown like it was weightless.
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Old 29-09-2019, 06:25   #25
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Re: catamaran flipped in Auckland tornado

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What amazed me was it didnt just flip it was absolutely thrown like it was weightless.
Yeah, that part is pretty concerning and is a reminder about just how much windage there is on a yacht, and even more so on a multihull.
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Old 29-09-2019, 06:28   #26
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Re: catamaran flipped in Auckland tornado

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Yeah, that part is pretty concerning and is a reminder about just how much windage there is on a yacht, and even more so on a multihull.

To be completely honest, I have felt that sort of feeling on my catamaran before. Like the wind was going to literally lift it out of the water. However, being on a mooring or at anchor means it wouldn’t really go anywhere or go flying like that. I think being at a dock is what causes that type of problem. Because it is not facing the right way.

A single point of attachment on the Windward side makes it a lot like the wings on the back of a dart. Even if it were to experience enough wind to lift, it would stay facing in the right direction.

At least that’s what I told myself. Ha ha ha
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Old 29-09-2019, 06:31   #27
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catamaran flipped in Auckland tornado

Now this is not an attempt to beat on a Cat, but I think they are subject to a form of compression lift with the two hulls and bridge deck, but ground effect from the waters surface would greatly enhance the lift.
https://en.m.wikipedia.org/wiki/Compression_lift

Think pickle fork tunnel hull.
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Old 29-09-2019, 06:33   #28
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Re: catamaran flipped in Auckland tornado

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What amazed me was it didnt just flip it was absolutely thrown like it was weightless.
You're right, that was pretty mental. Good to know that if mother nature wants to mess with you it doesn't matter what boat you're on, you're screwed. Small differences in odds notwithstanding.
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Old 29-09-2019, 06:35   #29
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Re: catamaran flipped in Auckland tornado

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You're right, that was pretty mental. Good to know that if mother nature wants to mess with you it doesn't matter what boat you're on, you're screwed. Small differences in odds notwithstanding.


Just from looking, I think that was a tornado, and not much survives a tornado direct hit
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Old 29-09-2019, 06:36   #30
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Re: catamaran flipped in Auckland tornado

Exactly, that's my point.
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