75 Years of crafting the best cruising sails

The Semi Square Head

Why Choose a Semi Square Head?

Challenge

  • Wish to have better performance
  • Wish for a classy looking sail
  • Wish to refine your sail tuning

Result of a semi square head main

  • Increased performance
  • More power even when reefed down
  • Higher off-wind efficiency
Catamaran Mainsail Semi squarehead fathead multihull mainsail
Semi Square Head Mainsail
May we introduce

The Semi Square Head

This sail is taking the concept of the large roach mainsail one step further. Originally made for performance offshore racing yachts, square-top mainsails have now also found their way on board more moderate cruising yachts. The semi square head is the middle way between the max-roach main and the radical, full square head sail. It delivers more power but is slightly less of a challenge to handle, especially when taking down and folding on the boom, than the full square head mainsail.

As in the max-roach sail but in a greater measure, the sail will twist to leeward on the top section when hit by a gust, de-powering and lowering the centre of gravity instantly. This can help to prevent overpowering and might tempt the crew to reef later than they otherwise would.

What's in the box?

Standard Specifications

Options and Accessories

lagoon dacron heavy sail with twinply leech
Your sail will be carefully designed, inspected, packaged, and shipped.

Compare Our Multihull Sails

Material
Premium Dacron
Performance
75%
Durability
90%
Price
$$
Colors

Semi Square Head Mainsail

Catamaran Mainsail Semi squarehead fathead multihull mainsail
Material
Premium Dacron, Hybrid Dynema
Performance
80%
Durability
80%
Price
$$$
Colors
Material
Premium Dacron, Hybrid Dynema
Performance
85%
Durability
70%
Price
$$$$
Colors
Material
Premium Dacron
Performance
75%
Durability
90%
Price
$$
Colors
Material
Premium Dacron, Laminate
Performance
85%
Durability
80%
Price
$$$
Colors
Sunset sailing
Clark Beam
Rated 5 out of 5
Can’t wait for the new sails to arrive to keep us moving fast

I have used several sails from Rolly Tasker and was always pleased with their construction and performance. Our main and jib for our Lagoon 440 Cat (tall rig) are well-constructed offshore capable sails. Excellent reinforcement and hand sewn chafe leathers. And the sails are priced well below many other options. 60,000 miles later, the mainsail has done its job. Probably could have gotten many more miles out of it if we didn’t sail quite so aggressively. We have had our cruising Cat at speeds in the mid to upper teens, with our top speed of 19.2 knots in 30+kts. I ordered the same sail again and can’t wait for it to arrive. The jib is still performing well, and I expect it will go another 10,000 miles.

Choose your Sail

Required Measurements

mainsail measuring form
Download Mainsail Form PDF

This is how it’s done

Buying New Sails has Never Been Easier
1 Semi Square Head Mainsail

Choose your sails and get a quote

Fill in the form as far as you like, hit send and get the ball rolling.

2 Semi Square Head Mainsail

We contact you within a few weekdays

To answer all your questions and advise you on your individual sail. You will then also get your final quote.

3 Semi Square Head Mainsail

We deliver your new sail swiftly

Depending on your location and time of ordering, you will receive your new sails within a few weeks.

4 Semi Square Head Mainsail

Just enjoy
your sailing!

Hoist your brand-new sails and enjoy a whole new sailing experience.

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