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C&C 39 a SEA Sailmakers Radial Cut Furling Genoa

Sailmaking

Custom Genoa and Jib Headsails

SEA Sailmakers builds custom genoas and jibs for cruising and club-racing keelboats and multihulls, designed in ProSail and finished by hand in our Phuket loft. Find your boat among 12,463+ models for instant pricing, or send your rig measurements for a custom quote. Jibs from around $650 and genoas from around $900 for a 30 ft cruiser.

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Upwind, the headsail does most of the work, and a genoa or jib cut to your rig's foretriangle does more for pointing and balance than simply flying the biggest sail the boat can carry.

Headsail types and options

We build non-overlapping jibs and overlapping genoas, set up for a roller furler or hanked on to the forestay. Sizes are given as LP (luff perpendicular) as a percentage of J, the distance from the front of the mast to the forestay at deck level. Every size can be priced online on your boat's page; choose by your usual wind strength, crew size and sailing style.

Jibs

A jib's clew stops short of the mast, which keeps sheet loads low, sheet leads simple and tacking quick. We offer jibs online at 90%, 95% and 100% LP. A 90% or 95% working jib suits boats sailed in windier home waters and short-handed crews who value easy handling and a clear view to leeward. Jibs also suit fractional rigs and performance cruisers, where the mainsail carries a larger share of the sail plan.

Price it on your boat
A furling jib made by SEA Sailmakers with the Andaman ocean in the background.
Jibs diagram

Panel layout

Cloth and construction

We build headsails in cross-cut and radial layouts, in woven Dacron or laminate, matched to how and where the boat is sailed. The right combination of panel layout and cloth keeps the draft where it was designed to be, season after season.

  • Cross-cut vs radial panels: Cross-cut woven Dacron, with panels running roughly perpendicular to the leech, is the cost-effective default for cruising genoas and jibs and handles coastal and passage loads well. Radial layouts, in IYU Dacron or Dimension-Polyant laminate, align the panels with the load paths radiating from each corner, so the sail holds its shape under high sheet loads. A coastal cruiser in moderate winds will get years of service from cross-cut Dacron; a boat regularly pushed upwind in a breeze benefits from radial construction.

Cross-cut genoa with panels running perpendicular to the leech

Cross-cut

Radial genoa with panels fanning out from each corner

Radial

A range of sailcloths in different weights stacked on a shelf

Sailcloth

Cloth chosen for how you sail

  • Cruising Dacron or laminate: Woven Dacron from IYU and Challenge Sailcloth is durable, tolerates folding and flogging, and is easy to repair, so it remains the standard for bluewater and long-term cruising. Dimension-Polyant laminates, cross-cut or radial, stretch less and hold their shape for better pointing, but are more sensitive to UV and creasing, so they suit crews who look after their sails. Black Dacron is also available, cross-cut or radial. Read more in our sailcloth guide.

  • UV protection for furling sails: A headsail left rolled on the forestay needs a UV strip on the leech and foot to shield the exposed cloth from the sun. We use Sauleda or Solartex, with Helios PTFE thread on the UV strip as an option for tropical and high-UV sailing grounds, where ordinary polyester thread tends to fail first. On a boat kept on a mooring all year, good UV protection adds seasons to a sail's working life.

  • Details that come as standard: Every headsail leaves our loft with a leech line and cleat, an overhead leech line where accessible, tell-tales, draft stripes and a sail bag. The leech line controls flutter, the draft stripes let you read the sail's shape at a glance, and the tell-tales show the airflow on both sides. Each sail is designed in ProSail, digitally plotted and finished by hand in Phuket.

Why SEA Sailmakers

Very large genoa laid out down the length of a bright loft hall with sailmakers working on other sails
  • Built in our own loft, shipped worldwide

    Every headsail is designed, plotted, cut and sewn in our sail loft in Phuket, Thailand. We ship worldwide with tracked delivery, so you can follow your sail from the loft floor to your berth.

  • Instant pricing or a custom quote

    Our boat database covers 12,000+ sailboat models with instant headsail pricing. Custom rigs, one-offs and less common boats can send their I, J and forestay measurements for a tailored quote.

  • Modern design, durable cloth

    Headsails are shaped in ProSail and digitally plotted before hand finishing, in woven Dacron from IYU and Challenge Sailcloth, or Dimension-Polyant laminate where lower stretch matters.

  • A warranty and a rating you can check

    Every headsail carries a one-year warranty on materials and workmanship, and our 4.7-star Google rating reflects the build quality and communication sailors get. Read the reviews before you order.

FAQ

Headsail questions

How much does a new genoa or jib cost?

Price depends on boat size, LP, cloth and options such as a UV strip or offshore reinforcement. For a typical 30 ft cruiser, jibs start from around $650 and genoas from around $900 in cross-cut Dacron. If your boat is in our database, its page shows an instant price for every size; for a custom rig, send your measurements and we will quote by email.

Genoa or jib: which do I need for my boat?

Masthead cruising boats sailing in light to moderate winds usually benefit from a 135% to 150% furling genoa, which gives enough sail area to sail well without a sail change. Performance cruisers, fractional rigs and boats sailed in windier areas are often better served by a 95% to 100% jib, which is easier to handle and keeps control in a breeze. Tell us your home waters and rig for a recommendation.

What do 135% and 150% mean on a genoa?

The percentage is LP, the shortest distance from the clew to the luff, as a percentage of J. A 150% genoa is a larger sail than a 135%, with its clew further aft, so it has more area for light air but more overlap past the shrouds, higher sheet loads and more work to tack. A 135% covers a wider wind range; a 150% suits light-wind sailing grounds where extra power matters most.

Do I need a UV strip on my furling headsail?

Yes, for any genoa or jib that stays furled on the forestay in sunlight. The strip shields the exposed leech and foot from UV, which otherwise shortens the cloth's life. Racing boats without furlers, and owners who take the sail off between trips, can leave it off, but most cruisers, especially in tropical waters, should specify Sauleda or Solartex.

How do I measure for a new headsail?

For most production boats we already hold the rig data. Otherwise we need I (the foretriangle height, from deck to the forestay attachment or highest halyard sheave), J (from the front of the mast at deck to the forestay fitting), your preferred LP, and the luff length available between the furling drum and the top swivel or hounds. Note any hardware clearances; our measuring guide walks you through each one.

What is the lead time for a custom genoa or jib?

Typical build time is 4–6 weeks from confirmed order, plus shipping to your location. Order ahead of a cruising season or passage to avoid delays, and ask about current schedules when you request a quote. If you have a firm departure date, tell us when you order so we can plan the build around it.

Can I have a laminate headsail for cruising?

Yes. Dimension-Polyant laminate, cross-cut or radial, suits sailors who want better shape holding and pointing, particularly on performance cruisers pushed hard upwind. Long-term liveaboards often still choose woven Dacron for its tolerance of UV, folding and repairs on the go. We can help you weigh the trade-offs for your sailing.

What comes as standard with a SEA Sailmakers headsail?

Reinforced corners, a leech line with cleat, an overhead leech line where accessible, tell-tales, draft stripes and a sail bag. Every headsail is designed in ProSail, digitally plotted and finished by hand in our Phuket loft, and is covered by our one-year warranty on materials and workmanship.

Further reading

Our Process

How ordering works

Whether your boat is in our database or fully custom, ordering a new headsail is straightforward.

  1. Step 1

    Find your boat or send measurements

    Search our database of 12,000+ sailboats for instant genoa and jib pricing at every LP size for your rig. A Catalina 30, for example, shows its rig dimensions and headsail prices straight away. If your boat is not listed, send us I, J, your preferred LP and the luff length between drum and swivel; our measuring guide walks you through each one.

  2. Step 2

    Confirm the design and quote

    We review your order and talk through cloth, LP, furling or hanks, and options such as a UV strip or offshore reinforcement. You receive a clear specification and price to approve; nothing is cut until you confirm.

  3. Step 3

    Built in our Phuket sail loft

    Your headsail is designed in ProSail, digitally plotted and cut, then assembled and finished on the loft floor. Typical lead time is 4–6 weeks from confirmed order.

  4. Step 4

    Tracked shipping worldwide

    Finished sails are packed and shipped with tracking to marinas and private addresses worldwide, and you can contact us at any time during the build or transit for an update.

The right genoa or jib helps your boat point higher, balance better and sail more easily. Find your boat for instant pricing, or send us your measurements for a custom quote. Every sail is backed by our one-year warranty on materials and workmanship.

We want to hear from you

Get a quote from us today

Can’t find your sailboat in our database or have some specific requirements for your project? We are here to help customise our products to your needs. Please give us all the details we need in the form and we will be in contact within 24 hours.