Constant Camber (CC) is an outside-in building method that results in a "molded plywood" boat. Unlike conventional molds, a single CC mold can produce many different designs. In fact, the mold is actually a laminating form.
Full or partial length panels are laminated from veneer and epoxy to produce frameless two-piece hulls from a single unilateral mold. Series production of panels is made possible by the geometric elimination of spiIing the individual veneer planks. Patented by Jim Brown<link to Jim's about us page here> this constant spile of each plank eliminates the labor-intensive hand-fitting of pieces. Panels can be assembled with various adhesives using either staples or vacuum bag for pressure while the adhesive cures. Vacuum bagging is the preferred method since it is faster and achieves a higher quality laminate with less adhesive. Unlike the complex vacuum pressure methods used in the aerospace industry, wooden veneer bagging is a fairly simple process requiring only common materials, most of which can be purchased at the local hardware store.
Dimensional stability is achieved without an internal skeleton by slightly torturing the compound panels during hull assembly which imparts pre-stressed eggshell rigidity to the panels. The resulting structure has extremely high strength for its low weight. Most material is relegated to the skin, thus gaining adequate skin thickness for good insulation and high impact/puncture resistance. Building a dimensionally perfect hull is accomplished without framing up; the mold and panels are all self-fairing. Hull shape is established by the mold geometry plus the mating perimeters of its panels. Panels are also used for decks, wing fairings, and cabins where appropriate on some designs.
A three-man crew produced two CC panels a day on this 6' X 16' laminating form for a pair of CC44M mid-cockpit trimarans. It took them just 9 days to make all 18 panels for the two boats. Simple construction and alignment assure continued production of smooth, fair panels.
Vessels that have been designed for this method range from large passenger carrying catamarans and sophisticated high-performance yachts to Third World workboats built to withstand repeated heavy use. Rigs, sails, and outfitting are designed to appropriate standards. Furthermore, this design approach is seen as a means by which the large manufacturer of multihulls and the small custom boatshop can both be made viable in the marketplace. For less cost than the investment of framing up a hull, panels may be laminated by individuals wishing to build only their own boats. They retain they important option of being able to produce more panels for other builders. Alternately the mold and vacuum system can be sold to another builder to return some of the cost of construction.
Each Constant Camber plans package includes a complete set of working drawings, a list of veneer suppliers, the descriptive Panelmaking how-to booklet, the Liquid Joinery epoxy guide, our Standard Details booklet, and other articles by the designer. Consultation, to a reasonable extent, is included in the design fee to assure the successful completion of each vessel.
The menu to the right shows our current catamaran designs.
SR32HT—This design is just like the SR32C from the deck down. But its profile appearance differs with its flush deck and trunk cabin. This Coast Guard-certified design will carry up to 20 passengers for day sails or can be converted to a cruising hull for up to four people.
SR36HT—This twin-cabin design is meant for extended cruising for up to six people. This boat can be converted to a day-charter boat for up to 20 passengers.
C440—The C440 cruising cutter has accommodations in both hulls and a large cockpit area on the bridge deck between the hulls.
CC40—Designed for charter or cruising, the CC40 sloop has a large central cockpit and minimal accommodations in the hulls.
SR46HT—The SR46HT is a four-cabin sloop designed for cruising or charter, carrying 20+ passengers on day sails, or extended cruising for 6 persons. This design has been Coast Guard certified.
15M Catamaran—Designed as a luxury cruising boat with four large staterooms, the 15M allows 8 people to cruise comfortable, or could be adapted as a day charter boat for up to 49 passengers.
SR50C—One of our more popular designs, this boat is chartering in a number of locations, on both sides of the Atlantic Ocean. The SR50c is a twin-cabin sloop intended for day sail charters with up to 49 passengers. This design has been Coast Guard certified.
SR50HT—The SR50HT, similar to the 50C, is a twin-cabin charter sloop intended for day sail excursions with up to 78 passengers, or it can be reconfigured for cruising with 8 persons aboard. This design has been Coast Guard certified.
SR55SX—A four-cabin cutter designed to carry up to 8 people for extended cruising. The SR55SX can also be reconfigured for day charter work with a capacity of up to 49 passengers.
SR255—The SR255 will carry more than 100 passengers as a day charter boat. This sloop can also be reconfigured for term charter or extended cruising for up to 8 people. This design has been Coast Guard certified.
SR64—A sloop day charter boat certified to carry up to 149 persons. This design has been Coast Guard certified.