Mono or multihull for rough weather?

[Pedro_The_Swift]

The Tassie Gov thought about this,,
and bought these-
https://www.aulro.com/afvb/images/imported/2014/12/360.jpg

remember?

according to the Maritime Museum in Devonport the reason they stopped using them was --

seasickness with passengers AND crew.

Bass Straight 1
Tassie Gov 0

I have been on one and they were bloody fast!!!:eek::eek::eek:

[incisor]

wave piercing cat.... i bet the hull fractured continually till it became uneconomic to maintain it

having worked on a north sea tug @ 110' and having built and sea trialled several twin hull 110" vessels

i personally much prefer single hull

once you have been on a big cat that buries it's nose you might realise why ...

nice in good water tho.....

[benji]

Yes they certainly did fracture the hull, and the superstructure also. After every rough trip they would be welded back up in Melbourne. Pretty soon they stopped running in rough weather.
Having sailed through 8 meter seas on a 120' vessel, I'd agree a mono Hull is better in rough weather. But they can't get near the minimal wetted suurface area of a cat.

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[DBT]

I don't have any naval design experience, but based on first principles, I'm guessing a multi hull will have a shallower draft and thus move faster. However it would also be more buoyant and thus get tossed around more in rough seas.

A mono would be a stronger structure (closer to a "tube" shape in cross section) and would dampen the vertical movement in rough seas' as it sinks into the waves more.

A mono might roll more, but then if a multi rolled over ... it ain't coming back.

Making a lot of assumptions here, but I suspect a mono can handle rougher sea than a multi, all else being equal.

[incisor]

Fastest thing I got to play on was an old pt boat ala mc hales navy..... Ex kiwi manned unit with twin v8 diesels

Nice bit of kit but not real flash in big water

[Bobeland]

I love a good multihull !

A poor designed multi is a death trap but a well built / well designed multihull is good for the back and the soul !

Just my 2 cents worth.....

[Alex 110]

Power- I like multihulls
Sail - monohull
Absolutely no reason just personal preference

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[austastar]

Hi,
The best hull in rough weather has to be a sub, preferably at a reasonble depth.

Yep, I get sick on a see-saw.

Cheers

[Tombie]

The good old vomit comet...

Wave piercing isn't suitable for that run...

Incat are looking at supplying TT with a new design Cat in the future - around 150mtrs...

For private / commercial in rough seas I've always loved the Harris Shark Cats.

Rough seas I've done on FFG and DE vessels... A fun experience for sure...

Just for the record, I don't get sea sick:angel:

[Roverlord off road spares]

I traveled on the Cat to Tassie many times and foud it great, fast. but I have sea legs. A lot of oldies and kids were green gilled.
The only pain was driving to PT Welshpool to catch the Ferry, 1.5 hours drive for me. I think it was a 6 hour trip from memory across the Strait.
It was only a summer months event, in Winter I think it went to Canada summer.

[dero]

What I have gathered from local pros , is that cats are great in chop . Ab divers love them . stable at rest to .

[Tombie]

Love the Cats
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[Chenz]

Scariest trip of my life was on a Marlin Broadbill twin hull in 2m swell and chopped up to buggery. Coming in with a trailing sea it kept wanting to turn onto the crest of the swell and on more than one occasion took water over the side.

Give me a good single hull like my Barcrusher cutting one hole and then pulling or riding through

[Tombie]

Love the Barcrushers too...
Marlins were known for that issue.
Never had the problem on the Shark Cat.

A lot of it comes down to the operator at times.

What BC have you got?

[Bearman]

I will agree with that Tombie, I have had 2 Bruce Harris Sharkcats over the last 15 years and have never had a problem in rough water. And I always run more HP than recommended. One of my beliefs is that it is better to overpower than underpower a boat - you can always back off the throttle a bit but you can't push it further forward if you are already on full revs. Lots of people have come to grief in rough weather particularly with a following sea and an underpowered rig. You can't beat a genuine Sharkcat in poor conditions:D

[incisor]

But they are little things

Big things behave differently

[Avion8]

This powered catamaran seemed to be doing quite well off Steep point back in June, a little slow going up the swell/waves, but fast down the other side:

https://www.aulro.com/afvb/images/imported/2015/01/778.jpg (http://s938.photobucket.com/user/jodel1050/media/Steep%20Point/P1000704_zpsaac401a7.jpg.html)

https://www.aulro.com/afvb/images/imported/2015/01/779.jpg (http://s938.photobucket.com/user/jodel1050/media/Steep%20Point/P1000705_zps4187f269.jpg.html)

Just glad I wasn't on it!

https://www.aulro.com/afvb/images/imported/2015/01/780.jpg (http://s938.photobucket.com/user/jodel1050/media/Steep%20Point/P1000706_zps30cd0dee.jpg.html)

Here he is finally going around the point.

I always thought I wanted a full displacement mono hull with flopper stopper stabilizers, like a Nordhavn or Kadey Krogan - sadly non in my price range:(

[Tombie]

These do alright too.. Some horrible water there! Been on it several times in huge swells.

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