UV Protection
UV Protection Systems
Section titled “UV Protection Systems”Headsail UV protection specifications and options for furling systems.
Acrylic UV Layer
Section titled “Acrylic UV Layer”Material Specifications
Section titled “Material Specifications”Material: Acrylic fabric only (e.g., Sunbrella)
Properties:
- Excellent UV resistance (5-7 year lifespan)
- Solution-dyed for color fastness
- Lightweight compared to Dacron alternatives
- Breathable (reduces mildew)
- Available in many colors
Weight Impact: +3-5% of sail weight
Available Colors
Section titled “Available Colors”Headsails use the same standardized UV color palette as mainsails. See UV Protection Systems for the full list of available Acrylic (Sunbrella) and Film colors.
UV Coverage Specifications
Section titled “UV Coverage Specifications”Standard Furling Coverage
Section titled “Standard Furling Coverage”Width of UV strip depends on sail size and furling drum diameter.
| Sail Size (Luff Length) | Leech Strip Width | Foot Strip Width | Overlap at Clew |
|---|---|---|---|
| < 10m (33ft) | 150-200mm | 150-200mm | Continuous |
| 10-14m (33-46ft) | 200-250mm | 200-250mm | Continuous |
| 14-18m (46-59ft) | 250-300mm | 250-300mm | Continuous |
| > 18m (59ft+) | 300-400mm | 300-400mm | Continuous |
Coverage Extent:
- Leech: Full length from head to clew
- Foot: Full length from tack to clew
- Clew Overlap: UV strips overlap to ensure full protection when furled
Enhanced Coverage (Tropical/High UV)
Section titled “Enhanced Coverage (Tropical/High UV)”For boats in tropical climates or extended UV exposure:
| Area | Standard Width | Enhanced Width |
|---|---|---|
| Leech strip | 200-300mm | 300-400mm |
| Foot strip | 200-300mm | 300-400mm |
| Extension | Up to clew only | Extended higher up leech (reefing positions) |
Construction Methods
Section titled “Construction Methods”Sewn UV Strips
Section titled “Sewn UV Strips”| Feature | Specification |
|---|---|
| Attachment | Double-stitched to sailcloth |
| Thread | PTFE (Tenara) recommended for UV exposure |
| Overlap | 25-50mm at joints |
| Edge finishing | Folded and stitched for clean edge |
Advantages:
- Serviceable (can be re-stitched)
- Traditional, proven method
- Easy to replace when worn
Thread Specifications:
- PTFE (Tenara): Lifetime UV resistance, recommended for all UV seams
- V92 Polyester: Acceptable for budget builds, 5-7 year lifespan
Bonded UV Strips (Laminate Sails)
Section titled “Bonded UV Strips (Laminate Sails)”| Feature | Specification |
|---|---|
| Attachment | Adhesive bonded to laminate |
| Material | UV film integrated into laminate |
| Replacement | Not serviceable, permanent |
Application: Laminate racing sails, integrated UV layer
Furling Alignment Specifications
Section titled “Furling Alignment Specifications”Proper Furling Sequence
Section titled “Proper Furling Sequence”Critical for ensuring UV strip is on outside when furled.
| Furling Direction | UV Strip Position | Verification |
|---|---|---|
| Counter-clockwise (most common) | UV strip on port side (outside when furled) | Visual check when furled |
| Clockwise (less common) | UV strip on starboard side | Check coverage |
Installation Note: Luff tape or bolt rope orientation determines which side the UV strip is sewn to. Always verify furler rotation direction before sail construction.
Alignment Verification Checklist
Section titled “Alignment Verification Checklist”| Check | Method | Pass Criteria |
|---|---|---|
| Full coverage | Visual inspection when furled | No exposed sailcloth visible |
| Edge sealing | Check seams when furled | No gaps, continuous protection |
| Strip tension | Check for wrinkles | Smooth, no diagonal wrinkles |
| Clew overlap | Inspect clew area | Full wrap-around protection |
Genoa Sock (Snuffer) Alternative
Section titled “Genoa Sock (Snuffer) Alternative”Genoa Sock Specifications
Section titled “Genoa Sock Specifications”Full sail cover for non-furling headsails.
Construction
Section titled “Construction”| Component | Material | Specification |
|---|---|---|
| Outer shell | UV-resistant nylon or acrylic | Sunbrella or equivalent |
| Inner lining | Soft, non-abrasive fabric | Prevents sail chafe |
| Hoisting line | UV-resistant braid | Dyneema or polyester |
| Bottom opening | Reinforced grommet | Heavy-duty #6-#8 grommet |
Sizing
Section titled “Sizing”| Sail LP | Sock Circumference | Application |
|---|---|---|
| 100-120% | 2.5-3.0m | Small-mid genoas |
| 120-140% | 3.0-3.5m | Standard genoas |
| 140-160% | 3.5-4.0m | Large overlapping genoas |
Installation
Section titled “Installation”| Component | Specification |
|---|---|
| Hoist point | Head fitting or masthead halyard |
| Storage | Rolled when not in use |
| Deployment | Top-down hoisting over furled/lowered sail |
Advantages:
- Full sail protection (entire sail, not just leech/foot)
- Suitable for long-term storage
- No UV strips required on sail itself
Application: Hank-on headsails, offshore cruising, extended anchoring
UV Protection Maintenance
Section titled “UV Protection Maintenance”Inspection Schedule
Section titled “Inspection Schedule”| Component | Interval | Check For |
|---|---|---|
| UV strip condition | Seasonal | Fading, brittleness, tears |
| Stitching integrity | Seasonal | Thread UV damage, loose stitches |
| Color fading | Annual | Assess replacement need |
| Sock condition (if applicable) | Annual | Clean, inspect seams |
Replacement Indicators
Section titled “Replacement Indicators”| Condition | Severity | Action |
|---|---|---|
| Thread breaking at edges | Moderate | Re-stitch with PTFE thread |
| Fabric tears | High | Replace UV strip |
| Significant fading | Low-Moderate | Assess aesthetics, plan replacement |
| Brittle/cracking fabric | Critical | Immediate replacement |
UV Protection Lifespan
Section titled “UV Protection Lifespan”Expected Lifespan by Climate
Section titled “Expected Lifespan by Climate”| Climate | Sunbrella Acrylic | PTFE Thread | Polyester Thread |
|---|---|---|---|
| Temperate (Northern Europe, Pacific Northwest) | 7-10 years | Lifetime | 5-7 years |
| Mediterranean (Southern Europe, California) | 5-7 years | Lifetime | 3-5 years |
| Tropical (Caribbean, Southeast Asia) | 4-5 years | Lifetime | 2-3 years |
Factors Affecting Lifespan:
- UV intensity (latitude, altitude)
- Time spent furled vs sailing
- Dew/moisture exposure (mildew risk)
- Cleaning frequency
Special Considerations
Section titled “Special Considerations”Racing vs Cruising
Section titled “Racing vs Cruising”| Application | UV Coverage | Material Selection |
|---|---|---|
| Racing | Minimal (just enough for storage) | Lightweight, narrow strips |
| Cruising | Full (extended use furled) | Heavy-duty, wide strips |
| Offshore | Extended (tropical climates) | Maximum coverage + Genoa sock option |
Integration with Hardware
Section titled “Integration with Hardware”| Hardware Component | UV Consideration |
|---|---|
| Clew fitting | Must be accessible through UV strip |
| Leech line exit | UV strip must accommodate exit point |
| Hanks (if hank-on with UV) | UV strip sewn between hanks |
| Telltales | Installed before UV strip application |
Cost Considerations
Section titled “Cost Considerations”| Feature | Cost Impact |
|---|---|
| Standard UV (Sunbrella) | +10-15% of sail cost |
| Extended UV (tropical) | +15-20% of sail cost |
| PTFE thread upgrade | +5-10% of UV cost |
| Custom colors | +0-10% (depends on availability) |
| Genoa sock | Separate product, ~20-30% of sail cost |