No love for trimarans - why?

[Skip JayR]

Reconfiguring an Orma60? I find this idea sexy. Any concrete budget calculations would be helpful.

I just found a Lock Crowther Kraken 33 on the hard round the corner of my own boat place. Seems an abandoned Tri. Mast seems also still available. Might be a fun project ... still waiting for the answer if the owner likes to give her away.Attachment 256796Attachment 256797Attachment 256798

[pbmaise]

Something I have been working on may pan out, and I love spending money before it is in my bank. Therefore, I have been dreaming.

When it comes to really big multihulls, catamarans seem to be losing the battle with trimarans.

Two big trimarans have caught my attention. They are both 45 meters (148 ft).

Seaffinity

https://www.vplp.fr/wp-content/uploa...lkglpvxmjc.jpg

and and Komorebi
https://cdn.denisonyachtsales.com/im...4_1_XLARGE.jpg

Of the two, hands down Seaffinity wins in my book. I still have this crazy notion of sailing in Patagonia. Therefore, I am not be comfortable with the amount of window area that was drawn in the plans. I also wouldn't be able to accept the giant swim platform in the back. I can't imagine the stress of a breaking wave coming from behind landing on that. I love the way the roof slopes, but I would certainly need some safety attachments before I, or any crew of mine, would be allowed up there.

It is really fun to watch the video at:
https://robbreport.com/motors/marine...ls-1234639982/

and

https://www.vplp.fr/en/cruising/seaffinity/

Beam on the Seaffinity is 16.8m (55ft) so hauling it out would be really fun. Probably more fun than my last trimaran. Oh, the airdraft 35.5 m (116.5 ft) happens to be the maximum airdraft for the St. Lawrence. Sailing the Great Lakes is mandatory for any vessel I buy. So it needs to be just a tad shorter.

[pbmaise]

Today I also came upon an ad for a Neel 51 built in 2018. They claimed only 750 engine hours and that they just completed rebuilding the sail drive. I was happy not to have a sail drive on my last trimaran. They also reported new trampolines, new auto-pilot, new house batteries. Other than perhaps the batteries, this sure seems to me like a maintenance intensive boat.

[Redreuben]

Originally Posted by pbmaise

Today I also came upon an ad for a Neel 51 built in 2018. They claimed only 750 engine hours and that they just completed rebuilding the sail drive. I was happy not to have a sail drive on my last trimaran. They also reported new trampolines, new auto-pilot, new house batteries. Other than perhaps the batteries, this sure seems to me like a maintenance intensive boat.

Probably been in charter ? Quickest way to accelerate wear and tear.

[goboatingnow]

Tbd first looks like something Geogre foreman would design

[pbmaise]

I found another one. These huge trimarans seem to be concept yachts that designers put out as feelers. I gather they are hoping someone comes along and hires them to complete the design to give to a yard.

This one is called Domus. I think a better name is The Pizza Box.

In the article about this proposed vessel: Rob Doyle and Van Geest Design have done extensive research into the practicalities and safety elements associated with trimarans. “We strongly believe if you want the benefits of multihulls at a 40-metre-plus size the only practical solution is a trimaran," the design team added.

These are statements I largely agree with.

This said, I want to pick apart their design.

....................Seaffinity...................D omus (aka Pizza Box)
Length...........45 m (147.5 ft)..........40 m (131 ft)
Beam.............16.8 m (55 ft)............35 m (115 ft)
Rig.............2 Unstayed Ayro Wing.......Stayed Sloop
Airdraft...........35.5 m (116.5 ft).......Looks like 60 m (197 ft)

The Ayro masts proposed for Seaffinity are carbon fiber. https://ayro.fr/projects/yachting/
These look low speed to me, this is actually a feature I love. I would need to know a lot more about the electric motors that make the adjustments before feeling comfortable.

The designers of Domus have used the word "performance" within an interview and quote a speed under sail of low 20 knots. I think they only just stuck a sloop rig on and tried to make it look proportional to the length.

https://yachtharbour.com/news/40m-tr...481?src=_pos_2

Notice the proposed standing rigging on this mast. They appear to have run two backstays right thru the mainsail. Or the boom cannot turn more than a few degrees off center. Speaking of the boom. Where in the world would you attach a gybe preventer?

Anyone have any idea what all the railings are for on the roof of the Domus?

I was frequently turned away by smaller marinas because my trimaran was 40 ft wide. I learned which ones were okay with it. There are several in SE Asia that would be fine with the 55 ft wide Seaffinity. However, I sure don't know any place that would like to see the Pizza Box at 115 ft wide.

Anyone even know of a marina that would accept a 115 ft wide yacht?

[goboatingnow]

On port you could freeze the upper deck and make money selling roller skating access’s

[Rohan]

Originally Posted by pbmaise

Anyone even know of a marina that would accept a 115 ft wide yacht?

That boat IS a floating marina

[purvisgs]

Under ~40 tri's have my vote 9/10 times. Over some point around 40ft it's hard to overlook the payload advantages of cats. Although I'm sure (comparing "like-to-like") big tris are just as/if not more fun.

[deminimis]

Love our Corsair 970. Definitely not a big cruiser, but if you've ever camped in a camper van, it's huge by comparison. I doubt I'd want to live on it six months at a time, but it's doable. What am I saying? I'd love to live on it six months at a time, as opposed to living in an office 40 hours a week. Eventually we'll likely end up with a cat, but giving up the performance will be difficult. The 970 tacks on a dime and goes lickity split. It suits our current needs perfectly.

[pbmaise]

I am finally back onto the computer doing my favorite thing...looking at sailboats.

I have lately been looking at the work of Walter Schurtenberger which is a name new to me. He is closely associated with Nigel Irens, whom I have heard of.

Nigel designed, and then Walter built The "RUSTIC SCHOONER" also called "CLASSIC CATAMARAN" is a 64 ft long and 28 ft wide day charter catamaran.

It was built in Florida at Constellation Yachts. CATAMARAN MOTOR YACHT

If my final budget proves to be more modest, a schooner rig will likely be the way I go. Had I continued to own my Kantola, I might very well have converted it into a schooner. You can see from my profile picture I was already headed in that direction.

Hmm...I wonder if I could get Kurt Hughes to scale up pipeline to create something closer to 85 ft by 55 ft with a schooner rig, some more topside living space.

[pbmaise]

If on the other hand, my final budget is higher, I am thinking of declaring my love for someone's work I never heard of before today. The work of Mathis Ruhl deserves attention!

Mathis speaks to me like he is an engineer who understands rig forces. This graphic of his illustrates why larger multihulls will move away from conventional rigs.

His slide show can be seen here: Juicebox Gallery

Notice how short this rig is compared to the length of the vessel. The reason is how much more efficient it is.

[Sand crab]

That rustic schooner classic catamaran was interesting. It was purpose built for a resort to do charters which never worked out. But in the "I don't know what they were thinking" dept:
There is no weather protection of any kind
There is also no designated seating.
I think the bridgedeck was planked like the deck at your house. Water could splash and some may not like that.

The booms especially the mizzen are pretty low so standing or working can be precarious.


Maybe it was too "rustic" for some.