Single-piece cross beam
One continuous structure.
Laid up and cured as one piece, so the load runs hull pad to hull pad with no bonded joint at the point of highest bending moment.
SparsForward beams
Where the forestay pulls hardest.
Cross beam, longeron and martingale, engineered as one structure to carry the forestay load.
01What it is
A tight forestay
starts here.
On a catamaran the forward beam and longeron carry the forestay. With a hard-sheeted jib or genoa the forestay pulls the longeron up and aft, and the martingale triangulates that pull back to the hulls, so the longeron works in compression rather than bending. Any bend that remains goes straight into forestay sag, and sag costs you pointing and headsail shape. Stiffness is the whole brief.
Section depth and laminate are set to your displacement, beam and rig geometry. Send us the specification form and we refine the structure with you against the full load case.
Send us your specification
02Intentional design
Everything inside.
Nothing bolted on.
Section depth does the work, not rig tension.
Forestay sag is set by how far the longeron deflects under load, so we take it out in the structure rather than asking the rig to carry more tension. Section depth and laminate are sized to your displacement and sail plan, and the martingale closes the load loop back to the hulls.
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03How we build
Modelled first,
then laid up.
- 01
FEA validation
Working and peak load cases modelled before any carbon is laid up.
- 02
Single-piece cross beam
Prepreg carbon, cured as one piece for uniform consolidation.
- 03
Two-part longeron
Built in two sections so internal systems are fitted and checked on the bench.
- 04
Co-cured trampoline tracks
Bedded into the flange during layup, so load goes straight into the laminate and there is no fastener line to seal or re-bed.
- 05
Prepreg martingale stays
Supplied by Smart Rigging.