Duotone Duke - 5 Battery Wave and Cross Over Windsurfing Sail

Our most successful 5-batten sail ever came back with a bang in SS23, and for SS25 we have given it a facelift!

The DUKE combines our LIGHT DONE RIGHT construction and all the other build concepts developed over the past decade to set a new benchmark for wind-range oriented handling sails.

When it came to developing the DUKE, it was a 1.5 year project, with you, the final user always at the center of the development. As a starting point we involved “real” end-consumers who use these kinds of sails regularly and our surf centers to define a bucket list for the reincarnation of the DUKE, and here is the outcome and how we went about it:

Maximum wind range especially in changing and/or super gusty conditions.

This is the most important factor and the major advantage when going for a 5-batten handling sail. As a simple rule, more battens give you more control and a bigger wind range. Usually this has a negative effect on the low

end power as more battens make it harder for the wind to inflate the sail and it becomes less efficient for pumping. Therefore, we have incorporated the BATTEN FREE CENTER concept from the SUPER_HERO. Instead of the usual even batten distribution the DUKE features a bigger gap between the foot batten and the batten above the boom. This makes the boom area easier to inflate plus increases the stability in the top (due to the increased batten density in this area). The second downside is that every batten increases the weight of the sail. That’s the reason why there was a trend towards fewer battens for wave sails in the past years.

Superlight feeling in your hands but without falling apart after 1-2 seasons.

The reduced weight of 4-batten sails was the major reason for the disappearance of the 5-batten sails in the past decade. Fortunately, we have made some major construction improvements over the last 10 years. The outcome of this development was the LIGHT DONE RIGHT CONSTRUCTION which got introduced in 2022. By replacing the usual multilayer reinforcements with a single layer of high-quality fabric and introducing the ONE PIECE SLEEVE we were able to reduce the overall weight by 300g. Most important we are the only brand out there where these weight savings have been achieved without reducing the thickness of the film and XPly panels. Only this way we can still guarantee our unmatched 5 year warranty. Another issue when reducing the film thickness is that the sail becomes spongy as the energy fizzles out in the increased elongation. This leads to the sail feeling heavier in your hands. So in contrary to others our sails are not just lighter on the scale but especially in your hands on the water when you use them. Cause this is where it really counts!

Early planing power even without excessive pumping

To achieve maximum planing power the DUKE features a high draft distribution combined with a deep profile which helps lifting the board onto the plane.

Super neutral in maneuvers

To make tricks and turns as easy as possible the sail should go completely neutral during maneuvers. Therefore, the DUKE comes with a more forward oriented draft position. The forward draft turns the power off and goes completely neutral as soon as you sheet out or shift the sail. This results in a much higher success rate.

Good lift and control for jumping

The higher draft position also increases your airtime as it generates lift while the more forward oriented draft position helps you to always remain in control.

Maximum range of use

One of the greatest assets of the DUKE is its versatility. It’s pure extasy in bump & jump conditions on your freewave board or as a smaller sail for blasting around on your freeride board. The forward/up draft position makes it also very capable for classic and even new school freestyle tricks. And last but not least it’s a great sail for medium wave and/or jumping conditions especially in gusty or challenging wind conditions. So, the new DUKE is a real all- round high performance contender challenging any handling sail out there.

Straight forward and fast to rig

With all the features, markers and hints we have developed over the past 40 years it’s safe to say that there is no other sail which is faster or more precise to rig than a DUOTONE sail. This means even if you aren’t a pro who is rigging and trimming their sail every day you will still achieve the same correct trim. As only with the correct trim can you unlock 100% of the sail’s performance.

Similar feeling than your bigger Freeride/Performance sails

Another important factor is that all the sails in your quiver should have a similar feeling/behavior. This even counts for professionals as it usually takes even them a full day to get used and adjust their style to a sail which feels very different. The major reason why sails feel different is the position of the draft in the sail. Fortunately, also here the DUKE has got you covered as it features a very similar draft position to the vast majority of all modern freeride sails.

So, you see we have thrown our entire know-how and experience into the mix to create the most sophisticated Jump N’ Ride high performance sail ever.

Key Features

Draft Forward: Forward draft turns power off and goes completely neutral during manoeuvres → results in a much higher success rate.

Batten Free Center: Larger gap between the foot batten and the batten above the boom → better inflation (planing power) in the boom area and improved stability in the upper sail.

Light Done Right Construction: Noticeable 200–300 g weight reduction without reducing the thickness of the main panel, maintaining Duotone’s renowned durability and longevity.

VTS Tail Outhaul Specs: Each sail carries individually defined visual indications for the correct outhaul extension (requires VTS TAIL boom).

iROCKET 2.0: Factory-calibrated individual batten tensions using a torque wrench for 100% accuracy and consistency.

Available in HD: Also available in a monofilm-free HD construction for extra durability.

Tech Features

2+3 Year Warranty

Guaranteed quality — no other brand offers anything close. Duotone strikes the perfect balance between low weight and durability. Almost all sails include a 2+3 year warranty (excluding monofilm).

👉 Register at www.duotonesports.com after purchase to activate. Valid for original owners only.

3D Top Cap

Transfers downhaul tension three-dimensionally across the sail body, eliminating top flutter and ensuring a progressive loose leech for extended wind range. Integrated abrasion ribs reduce the need for extra reinforcements.

Double D Buckle

Inspired by climbing harnesses and Formula 1 helmets. A unique two-part metal buckle replaces traditional vario top solutions → guarantees best trimming and zero webbing slippage.

Double Seam Technology

Double seams with triple-stitch zig-zag → twice the durability and up to 50% less stretch compared to single-seam sails. Crash zones reinforced for tear resistance and profile stability.

Dura Luff Patch

Flexible reinforcement around boom cutout prevents “accordion effect” wear when inserting/pulling the mast. Softer transition avoids monofilm breakage.

Duratech Foot

Plastic-channel protection at the sail foot → seams never chafe against non-slip coatings. Long-term durability guaranteed.

Epoxy Batten

Extremely strong epoxy laminate battens prevent breakage under high load → outstanding stability and longevity.

HTS 2.0 Harnessline Trim System

Printed indicators on the sail show the exact harness line centre → never misplace lines again. Quick, symmetrical setup every time.

Individual Boom Length Indication

Boom length markings printed directly on the luff sleeve → correct setup without trial and error.

Mini Batten

Short support battens prevent unwanted leech flutter between main battens.

One Piece Sleeve

No seam at the leading edge → 80g weight reduction, improved elasticity, no “hard spot.”

Polyester Webbing Only

Unlike polypropylene, polyester webbing has negligible stretch → sails retain full luff tension long-term with no re-trimming required.

Set & Go Vario Top

Clear indicators for mast length → instant correct setup, no trial and error.

Sleeve Opener

Ingenious Duotone logo design gently opens the sleeve during mast insertion → frictionless rigging with one hand.

Super-Light Bumper incl. VTS Slot

Lightest protector on the market. Vinyl window lets you view mast end trim position. Velcro patch can “save” trim setting for repeatable rigging.

Triple Tack Roller 3.0

Nickel-plated brass triple roller reduces downhaul forces → easier rigging and finer trim control.

TT Top

Concave shape improves three-dimensional top twist under high winds → neutralises gusts, stabilises rig, broadens usable wind range.

Twin Strap

Keeps sail compact when rolled and secures mast protector snugly to mast during use.

VTS – Visual Trim System

Loose leech trim markers for “lower wind limit” and “upper wind limit.” Allows any rider to trim sail to 100% accuracy in seconds.

VTS Tail Outhaul Specs

Individually defined outhaul indicators printed on sail (requires VTS Tail boom).

XPLY PLUS

Exclusive laminate with 150 or 100 micron films → maximum puncture resistance, UV resistance, and minimal stretch. Used worldwide by surf centres for proven durability.

iROCKET 2.0

Factory-calibrated batten tension system. Each batten set at 100% accuracy with torque wrench and locknut adhesive. Never needs re-adjustment → lifetime correct batten tension.

iBUMPER incl. VTS Slot

Lightweight mast protector + integrated trim tool. Vinyl window shows mast end position for trim accuracy; Velcro patch saves settings for repeatable rigging.

Tech Spec