Carbon and advanced composites give the same stiffness for far less weight. After racing boats they spread to fast cruising yachts and masts. In return they cost more, need more careful production, and damage may not be visible.
Production
- Prepreg
- Fabric pre-impregnated with resin, cured at controlled temperature. A consistent, light laminate.
- Infusion
- Dry carbon fabric filled with epoxy under vacuum.
- Core
- Sandwich construction with foam or honeycomb core.
Points to watch
- Galvanic corrosion: carbon in contact with aluminium corrodes the aluminium fast; joints must be isolated.
- Hidden damage: an impact can separate inner plies without a mark on the surface.
- Measurement: carbon conducts and distorts moisture meter readings. Inspection relies on records made during production and on specialist methods.
- Lightning and electrics: the conductive structure is allowed for in the bonding design.
- Repair: needs specialist skills and proper cure conditions.
Why carbon and advanced composites?
Carbon fibre and advanced composites build far stiffer, lighter structures than glass fibre. That is why they are used in racing boats, high-performance yachts, masts and highly loaded special parts. Lightness and stiffness raise performance; but material cost, production precision and repair demands rise too.
Production precision
In advanced composites, fibre content, resin system and curing conditions directly decide a part's strength. Much production uses pre-impregnated fibre and curing at controlled temperature. Records of these processes, temperature-time charts and material certificates are the evidence of quality and go into the build file.
Carbon and metals
Carbon conducts electricity and can cause galvanic corrosion in contact with metals such as aluminium. So insulation and the right fastening materials matter where carbon parts meet metal fittings.
Damage that hides
In carbon structures, impact damage can leave a small mark on the surface while causing wider separation between plies inside. So inspection after an impact is not visual only; sounding and, where needed, ultrasonic methods are used.
Repair
Carbon repair is done by an experienced shop, matching the original ply schedule and materials; method and materials are documented.
On survey
The survey focuses on connection points, impact marks and metal contact areas; where needed, a specialist composite inspection is recommended.
Value
A documented build and repair history is especially important for carbon boats, since buyers cannot judge hidden laminate quality by eye.
Carbon masts
Carbon masts deserve the same care: fittings, spreader roots and any impact marks are inspected closely, and the maker's inspection intervals are followed.
Buyers of carbon boats rely on paperwork more than on any other type, so a complete file is worth keeping current.
UV protection
Carbon surfaces are protected from ultraviolet light by a suitable coating; exposed resin degrades over time. The coating's condition is checked regularly at survey and maintenance, and renewed when needed, before the laminate underneath is affected.
For the owner of an advanced composite boat, production records are the most valuable document of all; repairs are documented with the same care and added to the file.
Carbon parts are light and strong but unforgiving of error, so the same rigour applies in production, maintenance and repair. A careful owner treats every impact as worth inspecting, however small it looks from the outside.
Any suspect mark on a carbon part is inspected carefully before the part is used again; a small-looking impact can hide wide separation inside, so the decision rests on measurement, not appearance.
When in doubt, inspect before sailing.