The Perfect Yacht ?

Potverdorie, een nederlandstaligen!
Belg of Nederlander? En wat doe jij in Cannes?? Heb jij een eigen jacht, TRY?

Lars the Try 100 is a beautiful design. Who is building her and when will construction begin? You will of course post pics of the project all the way through?

Our friend in Cannes is working hard to get all the pieces in place to launch the TRY project. First in the line is planned to be the TRY 130 and when it happens we hope that the whole process can be posted at YachtForums.

For those who prefer a monohull as The Perfect Yacht I have made a 110´design on the same theme with a raised wheelhouse. Here in Tuxedo Black...

/Lars

Why

On most of the yachts that are being proposed the engine room is inbetween the owners area and the guest cabins
Why share the noise to both, when with the simple modification of moving the engine room aft, you can reduce the running noise to the guest and owner.
Also helps having the engine room near the aft lazerette/garage to facilitate repairs to the notoriously low reliability of toys, jetskis etc.
There are many different gearboxes which allow good shaft angle even with engines further aft, V-drives etc.
Also with relation to long passages, one of the biggest bugbears for crew is their quarters are almost always fwd. This is the worst place to be on a passage.There are a couple of yachts out there with aft crew areas (Philanderer being one) and those crews rave about it. Especially with guests onboard and moored stern-to when late returning crew do not wake the guests!!!!!

Maybe why...?

Designing a yacht is to take many aspects into consideration. What you point at are two of them and you see a design conflict already there. I think all of the yachts in this thread has aft engine rooms, except the two LRC cruisers where the aft stateroom gives the owner a better privacy. On smaller round bilge yachts, it is a better option to have the engine room in the gravity center and the props on shafts not too far aft where they usually get airborne in heavy seas. You also have the stabilizers fitted in the engine room. With all aspects, including available hight in such hulls, the central engine room makes most sense.

With the crew, I agree somehow on sailing yachts or bigger motor yachts. Sailing a modern boat is definitely a slamming experience in the bow, even if you often make the long passages without guests and can move aft. And you can´t mean that the owner should be happier to sleep forward then?

In port you have the problem of where to be when on the yacht. Crew traditionally have the foredeck area with their accomodation below. The owner and guests prefer the aft deck and live below. By shifting these living areas you have created a new problem.

As you see, each yacht has it´s ideal solution and I have examples on all of these configurations in the designers forum. But my best advise to keep the owners happy is to give them these yellow things to put in the ears before going to sleep. It never fails...

Got a message from John Winter (Pacific Harmony)

Seems someone is following our discussion...

www.winteryachts.com

This is a very nice boat, but why would they mount the engines so far forward?? I would mount them rearward using waterjet drives for shallow draft.

This confirms ........

Thanks Carl,

This confirms my views on future market development for larger cats!

Good observation Catman! And an interesting question. There are a couple of reasons why the engines are (and appear) to be mounted further forward than one might expect...

A primary reason is Center of Gravity, but secondary... if you study the artist rendering below, you will see the hull tapers to the exit of the shafts. The props are placed immediately behind this point. The space leading up the buttocks of each sponson becomes progressively more narrow, thus reducing interior engine room width/space. The recessed, flat under-side of the aft deck/swim platform extends beyond this point and serves two purposes... additional lateral stability and a partial planing surface.

What is NOT shown in the original construction picture is the bulbous bow extensions that were added to each sponson. I've attached another picture showing their later incorporation. The bulbs were added after the initial sea-trials, when it was determined they would help the cat run flatter and reduce pitching in various water conditions.

The bow picture below also reflects the relatively narrow cross-section of the sponsons, which is one of the reasons the sponsons have an extended flat running surface under the swim platform. (increased stability)

Pacific Harmony is not typical cat hull configuration. It is actually a displacement hull with wave-peircing attributes. Here is a link that better defines the concept...

http://www.winteryachts.com/catamaran_design/pacific_harmony_design.html

Waterjets could be an option and the narrow cross-section of each sponson would lend itself to a high level of maneuverability, as there is no resistence to backwash.

I must say I didn't see the "buttocks taper". I like another kind of buttocks taper. But that does explain the engine placement a little better than the CG you mentioned(although that was probably a factor as well).

And yes I saw the bulbs on the website and knew there had to be a very good reason for them. I also wondered whether it was semi-displacement or full displacement.

I'm glad to read that you think waterjets could be used in that engine-forward configuration. I assume very long driveshafts would be invovled? I thought that with propellers the draft was too deep for a cat and it would have a hard time navigating the Bahamas.

Yes no doubt. If the interior volume of your cat can be brought up close to that of a monohull of comparable length, your boat will surely sell. I think the yacht-buying public is become better-educated about multihulls and their advantages. And I like your 100' length more than the Winter cat's 86'.

In the case of Pacific Harmony's sponson design, the engines would NEED to remain forward in order to accomodate the intake gullet of the jet pumps. The only problem I foresee is the buttocks of the sponsons would need be flat in order to mount the venturis and thrust directors. This would diminish displacement efficiency.

Because Pac Harm has a deep draft, due to the narrow cross section of the sponsons, the props are not exposed beneath dead bottom plane. This protects the running gear in the shallows.

John Winter and Malcolm Tennant have done a remarkable job with this hull. It's extremely efficient. With twin 800 hp Cats (not alot of HP for an 86' boat!), they are achieving 26 knots, with a 20 knot cruise. Backing off, a 13-15 knot cruise consumes less than half of an equivilent size monohull. And that same 13-15 knots, is the typical speed of Pac Harm's displacement counterparts.

Fast, fuel efficient, stabile. It's all good.

But... there's always a trade-off. Interior, below deck space favors the monohull. And if you think engine rooms are tight on most yachts... try to service an engine located in a sponson! The mechanic better be an ex-racehorse jockey. (a little humor, don't take me to task!)

I don't mind the jockey, but those sponson buttocks have got to go.

...and of course you don't have to sell me on the cat's efficiency. It's very fast, fuel-efficient and STABLE.

volume of a cat

The interior volume of a catamaran is always 30% more compared to a monhull of the same length.
The "missing" volume between the hulls is more than compensated by the extra square metrage on each deck above the waterline.
It's a simple question to re-arrange the layouts. Staterooms on the main deck, technicals and crew quarters in the hulls.
How to do this? Ask Lars!

For me, the perfect yacht would be a more refined Octopus. It would be bigger, widder, and taller and would be a grey or some shade of Black. It would have more power and it would have 4 heli-pads like a project from Lurssen I heard of. I don't think the yacht will every come to life though. I will try to come up with the specs latter.

Got one for you!

The ex-USSR Black Sea fleet still has an aircraft carrier up for sale.

Do you have a link?

The perfect yacht is still to be built


The grey and more power is talking to me but 4 heli-pads........ Ah, a Flying Boat.

Even 4 Sikorsky S-64 couldn't do it.

And I still wait for the call...

/Lars