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Old 06-20-2012
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Sailing yacht design

I came across this article while searching for information on yacht hull materials. Fascinating paper here from the 17th International Ship and Offshore Structures Congress.... I found it was very informative.

As one who is putting together plans for his own dream liveaboard sailboat... I am curious to know what would you include if you had a custom sailboat designed?

All opinions and dreams welcome. Let's see where this thread goes.

Here is the link to the paper:
http://139.30.101.246/ISSC2012/Mater...T%20DESIGN.pdf

Cheers,
-RG
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Old 06-20-2012
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Re: Sailing yacht design

[IMG]Sail Plan Sketch[/IMG]

My ideal boat would be sort of be the ultimate updated "coastwise cruiser". Coastwise cruisers were first popularized in the 1920’s. While they were not intended to be race boats, they were fast enough to race competitively, and to get you home when it was time to go back to work. They were not intended as ocean voyagers, yet they were seaworthy enough to stand up to whatever weather encountered and safely make offshore passages. They were not meant to be floating hotel suites but they provided a comfortable place cook and eat and sleep. In the 1970’s, the coastwise cruiser became the cruiser/ racer. They were still boats that could do both. Then came the age of specialization. Today, you’re forced to choose between blue water cruisers that are only intended for ocean voyaging, and race boats only intended for grand prix racing, and so called family cruisers that are designed to carry the maximum number of people crammed into their own little “staterooms”. I may ultimately do long ocean passages, or dream of racing on the grand prix circuit, and be attracted to the image presented in family cruiser literature but I have to ask myself, How do I really use my boat ?

I sail weekends, evenings, and a long cruise now and then. I would love to live aboard but mostly cruise when time permits. I may race a few club races, single-handed distance race and perhaps a beer can series. I have friends and a wife to sail with, but usually sail single or short handed. I am far more likely to face light to moderate conditions than to weather a gale underway and are more likely be hit by short chop and motorboat slop than the “ultimate wave”. I would like to follow the wind’s call but mostly follow a schedule. So my ideal boat comes down to no gimmicks- just a fast and comfortable cruising boat

I would like something like:
Sensible interior:
Full sized berths for a reasonable number of people. Berths that are comfortable underway as well as at a boat show. Comfortable seating for the entire crew and a few visitors more. A galley that works. Canvas clothing lockers that can be packed ashore and carried aboard. Canvas hull liners that are light in weight, provide full access to the hull, and which can be thrown in the washer at the end of the season.


[IMG]Accomodations Plan Sketch[/IMG]


[IMG]Photobucket[/IMG]

Sensible Galley:
The fully equipped galley is located near the companionway where it is within easy reach of the cockpit and dinette. Its position near the center of buoyancy means a galley with the least amount of motion. A top loaded Ice box. Frankly the one item that seems to be the most problematic on boats is refrigeration so I am not sure that I would have refrigeration. As a vegetarian this could work for me.

High Tech Construction:
The careful use of modern materials carefully engineered to produce a boat that is strong, light, and durable. Light to be able to drive through a chop or ghost in light air. Durable since I would rather use my limited time sailing than performing maintenance.


Fractional Rig:
To me the fractional rig is the perfect cruising rig. Since the majority of the sail area is in an easily de- powered mainsail there is no need live with an oversized genoa. This tall rig is very effective in light air. The comparatively small lapper jib works in a wide range of wind speeds. It is easy to tack and furls on a below deck mounted roller furler. As the wind builds the main is easily de- powered, just drop the traveler and crank in a bit of mast bend. When it really blows, the cockpit led reef lines and halyards permits quick on- the- fly reefing.

Daggerboard with Lead Bulb and Water Ballast:
Despite the shoal draft long keel, or wing keel hype, nothing goes to weather like a properly ballasted deep draft keel. Unfortunately, many a great anchorage is inaccessible to a 7’-6” draft. A daggerboard would permit the boat to sail exceptionally well when depths permit and an electric center board winch would allow for quick draft adjustment when shallower venues beckon. Old style Volvo 60 style water ballast would allow the boat to sail safer faster, and carry more sail comfortably in higher winds.

Full Size Tankage:
When a boat can sleep seven people it needs to have proper tankage and storage. Tankage should be something like 120 gallons of potable water storage in separate tanks, a 90 gallon holding tank (less with a treatment system), and a 40 gallon diesel fuel tank.

The sketches were done when I was organizing my thoughts as one of the 'Clients 'in Antonio Dias's book, "Designer and Client". That boat was intended to have stats like

LENGTH OVERALL LOA 44’-0”
LENGTH ON WATERLINE LWL 41’-0”
BEAM ON DECK B 12’-8”
BEAM AT WATERLINE BWL 10’-0” or so
DISPLACEMENT (half load) 17,000 LBS.
DRAFT- BOARD UP 5’-7”
DRAFT- BOARD DN. 7’-7”

BALLAST- LEAD BULB/SS DAGGERBOARD 7500 LBS.
BALLAST- WATER BALLAST 1500 LBS.
SAIL AREA Mainsail 580 S.F.
100% Triangle 440 S.F.
TOTAL 1020 S.F.

DISPLACEMENT/ LENGTH RATIO 140 to 150
SAIL AREA/ DISPLACEMENT RATIO 25
BALLAST/ DISPLACEMENT RATIO 44 %
MAX. GZ Positive To 125 deg (Keel down)
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Last edited by Jeff_H; 06-20-2012 at 11:45 AM.
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Old 06-20-2012
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Re: Sailing yacht design

Jeff, really...Give the question at least a little thought before you throw your half-baked ideas out here
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Re: Sailing yacht design

Here it is, Jeff! Rates 18 as well! Do this with a lifting keel and you're good to go!

Google Image Result for http://www.vanisle360.com/web_images/madrona.jpg

That might be the longest url I've ever seen.
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Old 06-21-2012
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Re: Sailing yacht design

Love it Jeff! I found this the other day... I like the layout a lot.

1993 Custom Built Aluminium Sailing Yacht - Blue Water Cruiser sailboat for sale in
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Re: Sailing yacht design

Thinking about the lockers, "...can be packed ashore." What if the lockers were hard boxes... like the trunks people used to travel with. I am thinking that any locker on the boat could be a trunk that clips in and out of the boat's internal frame - every storage area on the boat could be packed ashore as needed. They could have a seal, make them waterproof etc.. you could even ship them or take them with you on an airplane... hrmmm...

also,

What do you guys think of honeycomb panels for hull material?
aluminum honeycomb panels, aluminium honeycomb- manufacturer from China
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Old 06-21-2012
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Re: Sailing yacht design

Jeff,
You know your boat idea looks like a bigger version of my Etap 26. Lifting bulb keel, fractional rig.

Gary H. Lucas
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Old 06-22-2012
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Re: Sailing yacht design

Jeff's boat kinda resembles the Seaward 46RK

Hake Yachts 46RK
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Old 06-22-2012
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Re: Sailing yacht design

I'm curious about the standing rigging. With the mast canted aft it looks like there are three shrouds each side with slightly swept back spreaders. Is that right? While it seems to give very good support to the mast when the wind is on the beam or to aft, does this design put more force onto the forestay when the wind is forward? Would double forestays be appropriate?
John
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Old 06-22-2012
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Re: Sailing yacht design

"I'm curious about the standing rigging. With the mast canted aft it looks like there are three shrouds each side with slightly swept back spreaders. Is that right? While it seems to give very good support to the mast when the wind is on the beam or to aft, does this design put more force onto the forestay when the wind is forward? Would double forestays be appropriate?
John"


I assume that you are asking about the rig in my sketch. The idea behind this rig is that it has enough spar flexibility that you can easily induce bend in the mast as the wind comes up. Designing a rig like this is a bit of a balancing act. Too much bend and its hard to have proper headstay tension, without using checkstays, because as the mast flexes the hounds move closer to the deck loosening headstay tension. Too stiff and you don't have enough bend to depower the mainsail. I am showing diamond stays to help with headstay tension and to permit a masthead spinnaker.

Structurally, adding an extra forestay is unnecessary, adds nothing to the rig functionally, and frankly would screw up an otherwise great rig for dealing with short handed sailing in variable winds.

In other issues, I am familiar with the Hake Seaward and to me the sad part is that it is not the boat that I describe but should have been.

Aluminum honeycomb probably does not make sense in the marine environment and should not be necessary.
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