BRUCE ROBERTS
YACHT DESIGN

Bruce[2].jpg (4158 bytes)

Bruce Roberts-Goodson
EMAIL BRUCE


SAILING CATAMARANS



POWER CATAMARANS


CRUISING SAILBOATS


Spray Sailboats


POWER BOAT PLANS


WORKBOATS &
 FISHERMAN



PASSAGE-MAKING TRAWLERS

SEE LATEST LAUNCHINGS - NEW DESIGNS & COMMENTS FROM OUR EXISTING CUSTOMERS.

NEW ! SUPER STUDY BOAT PLANS ... Delivered by DOWNLOAD to your computer.
The study plans have lists of materials & equipment etc & these will be useful in costing out the complete boat. Each STUDY PLAN contains ALL the construction drawings for each material - STEEL, ALUMINUM, FIBERGLASS & WOOD EPOXY as applicable to the particular boat plan - with up to 25 sheets per plan!  Lists of materials - Technical information - Numerous construction drawings are all included. You can view & print the drawings in full or in sections. BUILDING PHOTOS are included in the study plan package. PLUS you receive a FREE (value 79.95) e-book BUILD YOUR OWN BOAT.
STUDY PLAN
 
SPRAY 370-A+B+C  59.95 - us$94.95 - €84.50

ASSEMBLING A SPRAY 36 KIT (Now Spray 370)

Over the past thirty years the Bruce Roberts Design team, lead by chief designer Bruce Roberts-Goodson, has produced hundreds of designs and developed numerous building techniques from which over 20,000 boats have been built world wide, including power and sail pleasure boats, commercial and fishing boats. From this they have gained a depth of knowledge and experience allowing them to participate in advanced computer development for metal boats which has resulted in a range of designs to 50 meter’s and of which the steel designs are now all available in "flat pack" steel kit form for delivery world wide. All steel is "Grade A" (St.44) with Lloyds certificate and cut on an "NC" driven plasma-oxygen cutting machine.

With the advent of this computer assisted three dimensional development it has become possible not only to offer the popular range of Roberts stock designs but to include any steel design at a modest additional cost for the computer development. Radius chine kits are available as well as single and multi chine packages. These kits appear to provide the elusive link between computer-aided design and the latest fabriCATAMARANion techniques. Individuals and shipyards, particularly small enterprises can now benefit from modern cost-effective methods without major investment. With these techniques, you can obtain millimeter accuracy with outstanding surface finish. To quote from one builder, Roger Lasham, building a Coastworker 30 in the UK, "I had completed the bottom plating which was only tack welded in place, yet when it rained overnight and the wind pulled the tarp aside allowing water to collect in the bow, it did not leak away so accurate was the fit".

TYPICAL SPRAY KIT
Looks simple! This kit saves hundreds of hours of making patterns and cutting metal....See below.

Steel kits only require semi skilled labor for assembly and all steel plates, excepting 3mm, are shot blasted and primed with "Sigmaweld-mc" zinc rich primer which is especially formulated to allow the builder to weld the plates without destroying the adjacent prime coating. Another feature of this weld primer is that it does not give off toxic fumes nor is there any weld "splatter". As each kit is "computer developed" and the parts are all nestled including all the plating so that you can easily assemble the hull, deck and superstructure in a very short time compared to conventional building and THERE IS NO WASTAGE. All windows, doors, scuppers, prop and rudder tube holes are cut out and a pre-cut building cradle is supplied. The Bruce Roberts organization is able to develop any existing design into a steel kit or provide modifications to an existing design to be incorporated in a kit. They offer a worldwide service and a special facility for builders and boatyards in developing countries where kits can be supplied tack welded or fully welded and come with full technical backup and access to the latest building techniques and designs. Labor saving can be as much as 75% on conventional hull building times.

These metal kits are produced in such a manner that even an experienced builder will save many hours on the preparation work because the plates, frames, longitudinal and stringers and further necessary parts for the hull and superstructure are supplied pre-cut and accurate. NO TRIMMING IS REQUIRED. All the parts fit perfectly. On radius chine kits, the radius panels are rolled to the correct radius and you will only need to trim the edges after you have installed the rest of the hull plating which, does not need trimming. All plates have marking lines for positioning of frames, etc. and all plates are numbered and come with clear instruction and part drawings showing all items. Maximum plate size 6 x 2 meter. Metal kits are available in STEEL or aluminium.

The following are a series of photo's supplied by our Australian office that show the stages of putting a SPRAY 36 kit together. All the equipment that is needed is a welder, a grinder, a lifting device and for the competent home handyman a spare four to six weeks..

This Spray 36 is being built at Burnett Heads, Queensland, by a man that has had no previous metal working experience at all. As you can see, the parts are all numbered and fit together into precut slots. The plates are all marked where they fit onto the frames. A foolproof method of building your dream boat.


Snipping the binders. This kit was delivered by flat bed truck.


Forward bulkhead. By studying the cut out shapes on the boat plans beforehand,all parts are readily identifiable.


Frame part showing limber holes and the precut slots for the stringers to sit into.


All pieces are marked with code numbers that match with those shown on the plan.


Stringers, frames and solid floor webs laying out on garage floor.


Markings on plate where frames and stringers are first tacked, then after erection, completely welded.


Unloaded pallet. This kit, weighing 7.2 tonnes took four men 1 hour to unload.


Concrete pads laid and cradle welded up.


The frames have been tacked together ready to be erected once keel and hull bottom plate have been laid.


Floor webs being tacked to keel.


Floor webs in place showing lightening holes, notches for sole supports and stringers.


Bulkheads put into position and braced.


Frames and bulkheads starting to be erected.


All bulkhead and frames standing, stringers slotted into place and tacked.


Cockpit tacked into place.


Deck to cockpit bulkhead join. Perfect!


Side deck and cabin sides with windows cut.


Part only of the vast interior.


View of the transom


3D model of the interior layout. This has been made to scale.

s36_interior.jpg (20883 bytes)

s36_hull1.jpg (18905 bytes)

s36_hull2.jpg (17296 bytes)

s36_hull4.jpg (21967 bytes)

The following is a breakdown of the time taken to build this hull.

Arrival of Kit, sorting parts and preparing................... 2 men........................1 days
Assembly of jig(s) and welding web frames.................. 2 men.......................3 days
Assembly of Hull & Deck, tack welding completely..... 2 men......................10 days
Finish welding Hull & Deck........................................ 2 men......................10days
Grinding visible welds................................................ 1 men........................4 days

Total time should be between 350 and 400 man-hours.
The time is more or less reflected on the equipment and expertise available.

BELOW is another Spray 370 being assembled in UK from one of our kits

S370-P1.jpg (22103 bytes)

Picture of us with the assembled S370 'A' Version kit hull

Hi Bruce/Edgar,   Things going OK. The attached photos are a little out of date now as the most recent ones are still in the camera. I'll get them to you as I get them. Currently I'm working on the superstructure with the bow deck and the two main saloon decks in place. The saloon sides are also in place held with quite literally a couple of welds on the No 7 frame/bulkhead.The welder is inside the boat so I've decided to tack weld working from the bow. I'll then move the welder through to the cockpit, then aft cabin and then seam weld in reverse order - inside - i.e.. aft cabin, cockpit, saloon then move to the outside, thus reducing the need to keep moving the welder through unnecessarily. It's going OK. I hope to make some headway in a couple of weeks when I'm at home for 8 days. I've got 8 weeks off in the summer (July & August! No holiday - just more boatbuilding!) At the moment it's back to just the odd hour in the evenings and occasional weekends.

She's a wonderful shape. I love her already! Thanks to you both for the design and cutting.

I'm working on my own since the Easter Holidays so getting plates aloft is quite a challenge - but I like challenges!I got three up today! Anyway I hope the photos are OK.... Regards Andy