class 950 yacht

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Didi 950 by Dudley Dix

Radius chine plywood class 950.

URL: http://www.dixdesign.com/didi950.htm

Description:

Build yourself a performance boat

• Economy of plywood
• Modern radius chine hull with topside chine
• Stitch & glue cabintop & topside chine
• Developed from Didi Mini Mk3 concept
• Strong steel keel with lead ballast bulb
• Twin transom-hung rudders
• Round bilge from sheet material
• Amateur or pro builders
• Very comprehensively detailed drawings
• High performance racing in a boat that you can build at home

The Didi 950 is the newest boat in our range of radius chine plywood designs and has been drawn to fit into the Class 950 box rule. This is a level class rule for short-handed offshore racing that produces a strong boat of reasonable proportions. This also makes it a rather nice performance cruiser suitable for two couples or a small family.

All structural drawings are done and ready for builders to start. Steering and some minor detailing is still in progress and will be supplied to builders when ready. Kits are already available in USA.

The interior layout shown is the first one drawn, with aft heads and the sleeping cabins separated for good privacy. There will also be an alternative with the heads moved into the forepeak and mirrored double aft cabins. It will be drawn when someone wants that layout.

This is a good seaworthy interior, safe in rough seas. It is set out around the central engine location, under the centre galley unit. This places the engine over the top of the keel and close to the centre of pitch, for reduced pitching and improved performance in waves. It also allows a very snug U-shape galley where the cook has plenty to brace against and can jump out of the way quickly, without any need to be strapped in. The galley counters house lots of storage as well as a large icebox or freezer.

The settees in the saloon serve as additional sea berths. The spaces under the seats house integral water tankage that can be the 100 litre minimum required by the Class 950 Rule or can be as much as 400 litres if all of the space is used for tanks. Outboard of the backrests are shallow cave lockers. The base of the saloon table houses two 100ah batteries and an optional third battery can be placed under the nav table. The nav table is large for this size boat and proportioned so that it can be used either seated facing forward or standing facing outboard.

The aft berth is 2.13m (7ft) long to suit the tall client who commissioned the design. Outboard of it are deep cave lockers above the water ballast tanks. The heads on starboard has a wet locker aft of the WC, convenient to the companionway for wet foul weather gear.

Ballast water tanks are 450 litres each side of the boat and span the length of the aft cabin. They are placed low in the boat where they will be of maximum benefit for righting from a knock-down situation, whether knocked down to leeward or to windward.

Aft is a large lazarette that can be accessed from the aft berth or through a hatch in the starboard cockpit seat. In the quarters are a gas locker to port and a liferaft locker to starboard, accessed through flush deck hatches. Both are vented and drained through the transom.

Hull shape is radius chine with a partial hard chine in the topsides. The radius chine runs from the transom through to the forefoot and produces a shape close to round bilge, with a shallow v-bottom. The hard chine runs from the transom through to the mast, where it fairs out into the topsides. The resulting shape is fine in the bow, with a broad, clean and powerful stern. Low drag and fine bow for wave penetration and upwind sailing, powerful aft for planing downwind in the strong stuff.

The deck configuration uses stitch & glue construction methods for cabin and cockpit details. This gives simple and speedy construction along with a pleasing appearance. It also gives a cleaner interior, with less longitudinal framing.

Cockpit coamings are shaped to form a backrest and cubby holes for sandwiches, winch handles etc. The top is shaped to be a comfortable seat for helming on the weather rail.

Detailing is based on the series of radius chine plywood designs that started with my DIDI 38 "Black Cat", and was followed by a string of designs through to the Didi Mini Mk3 .

Construction is with sheet plywood panels to hull sides and bottom as well as all of the deck and superstructure. The hull radius is done in two layers. All of the skin is 9mm thick, designed to exceed the requirements of ABS Offshore Yacht Rules. The hull can be skinned with 12mm as an option for increased strength for cruising.

The keel is a hollow steel fabrication with through-bolted beaver tail ballast bulb. It is bolted through the hull to a steel support box on the inside and which is bolted laterally and fore/aft to glass reinforced plywood backbone and bulkhead components. This support box also incorporates the engine beds and bearers, for a strong and compact structural unit. The loads of keel and engine are ditributed laterally through the bulkheads and floors as well as fore/aft through the backbone components. These members also tie into the mast support structure. Linked twin rudders are steered by central tiller.

The deck layout is a fairly conventional 4-winch arrangement. All halliard and reefing lines are led to the two cabin roof winches. All headsail and asymmetrical spinnaker sheets are led to the winches on the cockpit coamings.

Spars can be either carbon for performance or aluminum for reduced cost.

Drawings include full size Mylar patterns of the backbone, bulb & rudders. Optional full size Mylar patterns for the bulkheads are also available.

Boats about same size as Didi 950

Questions? Suggestions? Contact us at: [email protected]

Professional BoatBuilder Magazine

A lesson in tolerance (and other tips for joining plywood).

By Melissa Wood , Oct 23, 2014

In his Design Brief in Professional BoatBuilder No. 152 , yacht designer Dudley Dix writes about the Didi 950 (9.5m/31′2″), the plywood raceboat he designed to meet Class 950 rules. It is the latest iteration of radius-chine-plywood racers designed to approximate the shape of a round-bilge fiberglass boat that began with his own Didi 38 (37′9″/11.5m), Black Cat . He writes, “The idea was to help amateur builders build boats that didn’t look amateur-built and so would be more attractive in the resale market.”

For his Didi 950, yacht designer Dudley Dix switched from scarf to puzzle joints after he began working with kit supplier Chesapeake Light Craft.

Dix was an amateur boatbuilder before beginning his professional yacht design career in 1979. Throughout, he has worked with plywood. His blog with tips for boatbuilders  includes an explanation of the types of plywood, methods for joining them, and lessons learned along the way. Before the Didi 950, for example, Dix had been joining panels for kit-boat designs with stepped scarf joints. According to Dix, these joints—the mechanically produced equivalent of hand-planed sloping scarf joints—easily slide, making them tricky to align. In a post about stepped scarf joints , he shares some of the various methods that companies have adopted to overcome this problem.

For the Didi 950, Dix switched to puzzle, or jigsaw, joints in kits supplied by Chesapeake Light Craft in Annapolis, Maryland (also featured in PBB No. 152), which are CNC-cut to lock together like puzzle pieces. Unlike scarf joints, these pieces won’t slide apart. However, panels with tightly fitted jigsaw joints can be assembled only on a large table or floor before being moved upright to the boat. As he explains, that construction method might work for a professional shop with many hands to lift large, pre-built sections, but he was developing a kit that would also be built by amateur—often solo—builders.

“Building with jigsaw joints and gluing the joints in position requires a slightly different approach. It is not practical to hammer a tight joint into place with a rubber mallet. The stringers and other supporting timbers are springy and will bounce away when hit, making it difficult to get the fingers properly flush,” he writes. Another challenge is achieving accurate longitudinal alignment. If the first piece is even slightly out of alignment, the degree of misalignment increases with each additional panel, so that “an error of 1mm (0.04″) on the first of four panels will grow to an error of 4mm (0.15″) by the end of the fourth piece.”

To solve these problems, Dix recommends machining tolerance into the joints. If the jigsaw pieces are a tiny bit slimmer and shorter at the ends, they can be pushed into place without hammering, allowing for upright construction. Tolerance in the joints also provides space to correct minor misalignments. You can find more details about his method of working with jigsaw joints here .

Also check out Dix’s entries on sawtooth stepped joints  and  butt joints .

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Mathieu VENOT

[Naval] || {Computation} || Architecture

(With Jeremie LABASSE & Leila SALOMON)

Study, presizing and preliminary design of a class 950 sailboat.

Our choice was to target offshore racing purposes, maximizing performances and deck ease of maneuvering.

We performed structural analysis, velocity prediction, and regulation validation.

{REFERENCES}

- HYDROSTATICS / STABILITY

- WEIGHT ESTIMATE / SCANTLING / GENERAL ARRANGEMENT

- Y. d'ARMANCOURT (Mecanique du voilier) [2015]

- F. NEUMAN (Structure des voiliers composites) [2007]

Software : Rhinoceros3D

Grasshopper3D / Nemo / Orca3D

Teacher : Frederic NEUMAN

Yannick d'ARMANCOURT

Christophe BARREAU

David RAISON

Year : 6 (2018)

All content © 2011-2024 by Mathieu VENOT

Dudley Dix Yacht Design

News about what is happening at Dudley Dix Yacht Design, from new designs to boat shows or anything else of interest to our followers.

Saturday, January 7, 2017

Didi 950 project in australia.

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9.5m ‘Classe 950’ Offshore Racing Yacht

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About BAYESIAN , brought to you by BOATPro

BAYESIAN is a 56.0 m Sail Yacht, built in Italy by Perini Navi and delivered in 2008. She is one of 10 56M models.

Her top speed is 15.5 kn, her cruising speed is 13.0 kn, and she boasts a maximum cruising range of 3600.0 nm at 12.5 kn, with power coming from two MTU diesel engines. She can accommodate up to 12 guests in 6 staterooms, with 9 crew members waiting on their every need. She has a gross tonnage of 473.0 GT and a 11.51 m beam.

She was designed by Perini Navi , who has designed 45 other superyachts in the BOAT Pro database.

The naval architecture was developed by Ron Holland Design , who has architected 59 other superyachts in the BOAT Pro database, and the interior of the yacht was designed by Rémi Tessier , who has 26 other superyacht interiors designed in the BOAT Pro database - she is built with a Teak deck, a Aluminium hull, and Aluminium superstructure.

BAYESIAN is in the top 5% by LOA in the world. She is one of 31 sailing yachts in the 55-60m size range, and, compared to similarly sized sailing yachts, her cruising speed is 1.28 kn above the average, and her top speed 1.05 kn above the average.

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Specifications

• Name: BAYESIAN
• Previous Names: SALUTE
• Yacht Type: Sail Yacht
• Yacht Subtype: Motorsailer
• Builder: Perini Navi
• Naval Architect: Ron Holland Design
• Exterior Designer: Perini Navi
• Interior Designer: Rémi Tessier
• Refits: 2016

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Does anyone here have latest verions of Classe950 box rules?

Discussion in ' Boat Design ' started by pironiero , May 6, 2022 .

pironiero Coping

Hello! Does anyone here have latest verion of Classe950 box rules(preferably in english)? im asking here because classe950.com is dead and there is no way to download rules from it, i've managed to find year2007 edition of the rules, but i'd like to get the latest one.  

luckystrike Power Kraut

Hello, the class 950 is not existent. A few boat have been built but a aktive fleet never formed. I think it was because they went the normal way with rules allowing everything what makes a racing boat fast and very expensive. In the end design and construction was as expensive as a class 40.  

I don't think you're right, because 950s are being built, slowly but surely fleet is getting bigger. 950s appeared in a wrong time bracket  

Anyways, I've found what i wanted.  

Skyak Senior Member

pironiero said: ↑ Anyways, I've found what i wanted. Click to expand...

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Statuts de l'association http://statuts950.blogspot.com/ 9,50 Rules http://rules950.blogspot.com/ Jauge 9,50 (version Française) http://jauge950.blogspot.com/ Open 9.50 http://www.open950.com/classe_9.50_010.htm  

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