Tri Hull

Posted by Ken Fisher 
G'Day all,

I'm considering buying a Tri-Hull approx 5.4m.
Would appreciate if any of you guys have info on Tri-hulls [8|]
What are the pro's & cons, etc, etc, [:-]

Cheers
Ken
Hi Ken

I have a tri-hull, bit bigger though at 7m. It is a great boat, very comfartable to fish from and it is very stable, needs very little power to run and takes the sea very well. It runs very well in any sea except straigh into a head sea, which I take at an angle and then it is no problem. The boat is dry, turns well and seems to have the best of a deep v and a cat.

In saying all the above, my boat is designed quite different to the normal tri-hull, so I do not know how it would compare to the boat you are looking at.

Cheers

Deon[smiling smiley]
G'Day Deon,

Thanks for the info.

Some info given to me is that the tri hulls are similar to cats in that they don't corner/turn very sharp - unlike the mono hulls. What's your experience with this?

They should ride well due to design and obviously very stable. The tri I'm looking at is ali.

Just wanted to know if anyone has had any bad experiences with them [:@]

Cheers
Ken
G'day Ken,

Ive used a 8.5 meter ally tri-hull (built to survey) set up as a dive platform. Very stable boat which handled WA sea breezes well. Had no problems with it except for the fuel tanks being built to far forward. Overall a good work boat.

Regards
Larry
Ken,
There are a lot of variations on the tri hull theme, some with not so good attributes.

Forget anything that is squared off in the bow, like the western whalers. Many of those sort of designs are flopped from old Boston whaler hulls - a far cry from modern thinking.

A good tri hull will have very fine entry on all 3 hulls, tunnels running the full length of the boat, the centre hull will dominate the side hulls. A 3:1 length to beam ratio is good - 2m beam in a 6m boat.

Gavin Mair's Air riders are supposed to be good, and a lot of boat for the money.

Getting a good tunnel shape is hard to do in ali and requires some trick bending and cutting. Can be done as these pics show. 'Glass comes into it's own in getting nice hull shapes.

There are 3 big ali tri hulls operating as crayboats out of Gero, all designed by John Fitzhardinge. Nat Gedero has 2 - Kadicha and K2, and the other is Isle of Erin. K2 with 1400hp, about 45 foot long , outdrives and surface piercing props tops 45 knots in 450mm of water. An awesome boat.

The pic is Isle of Erin, with an 800hp jet in it.

Oh, on the handling thing. A good tri hull will outturn anything. If you can hold on that is. The boat will take the corner but the occupants may not. Warn passengers before doing sharp turns. Like any multi hull they take a bit of getting used to how they handle.
Craig

[image]local://upfiles/9/D86B5514ADBF457CAFFA2C55AC027431.jpg[/image]
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Gavin Mair's Air riders are supposed to be good, and a lot of boat for the money.

Have heard that too, seems quite a few VMRS groups are getting them, including the one I am a part of.

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Oh, on the handling thing. A good tri hull will outturn anything. If you can hold on that is. The boat will take the corner but the occupants may not

Hope so, we (The local VMRS) have ordered one, nimble handling and rough seas performance are two of the many things we need it to have.
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Hi Ken

My boat which is a Eagle Ray 2300, turns just like my old deep V's use to turn. ZThe rear section of the hull has a cut out for the motor, which essentially bring the motor a bit forward and this enables it to turn sharply (well as sharp as I have ever needed) without any problems.[grinning smiley]

As said though, there are numerious different tri-hull designs and they all behave differently.

I am very happy with mine[winking smiley]

Cheers

Deon
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When did you get that Tone ? awsome for 18 k where do you park her ?
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That has got to be one of the most dog ugly boats I reckon I've seen Tony. It would want to have some redeeming features. Who put the Floaties on it?

This is what a proper tri hull looks like[link=http://www.marinekits.com/gallery.php?id=146]Derby Sea Rescue Air Rider[/link]
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is that the tri hull from Ultimate fishing adventures cause IMO that would be a boat i would kill for[sm=icon_cooltext.gif]
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got a spare million or three for me???
What, for fuel?[grinning smiley]

Tony, you mentioned getting your new rig checked over by a marine architect.
For punters like myself looking at buying a used boat it seems like a worthwhile exercise.

Can you give us an idea of what sort of dollars they charge?
What sort of stuff do they look for?
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Tony

She sure is ugly, at least you don't have to sleep with her[grinning smiley][grinning smiley][grinning smiley]