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Our design process is based on rider feedback. We read and answer all your messages. Some of them get published here so as to build a growing knowledge base.


Nexus B vs Nexus

Archived Under Nexus

Question: What’s the difference between Nexus B & Nexus?

Im lookingat getting nexxus b 7.4 to go with my
new quiver of 202 bonzai 6.4 , 55 4.7
What is the difference in feel nexxus b vs normal nexxus.
I have a naish rdm would that work or should i get new mast . Im 220 lbs
and prefer rdm but if sdm is better then i could get


Answer: Both sails are virtually the same, weight wise, and also regarding performance and feel. Nexus B, the augmented Bi-Ply version, is more visual and colorful, as well as durable, due to its increased Bi-Ply UV resistance and longevity. Nexus, the regular Monofilm version, comes as the “less is more” option, visually, while its film should be handled with a touch more attention and care, especially over time. 

I can’t speak to the Naish mast, I haven’t verified the mast myself which would mean measuring the bend curve at least.

I will say that at 460, the required mast for Nexus models 7.4 most masts on the market are on the “constant curve” side of the bend range, and compatibility between brands (sails/masts) is mostly ok.

Not so much on the shorter masts- I design to a more flex top curve in those sizes. On the market generally there is more division on concept there.

Of course I would recommend a Goya mast, but particularly in this season- I have spent the last several years overhauling the range and this year we have introduced such a nice collection of products, they are working really well in the sails, I am stoked.
RDM 460 for Nexus models 7.4 is an excellent choice.
SDM is also a good choice, it has a bit more of a direct feel, and that tends to favor bigger riders who like to “lock and load, point and shoot”.
For you at 220 pounds, it’s up to you- some bigger riders like the more flex, active feeling rig because it supports a more active, maneuver oriented style of riding.
In the Goya mast range, there is a range of choices- generally the higher the carbon content, the lighter the mast, then it’s a matter of choosing the durability level that is right for you. All the models have the same bend curve and IMCS specs so they all fit and support the sail correctly.
Hope this info helps Jim.
Let me know how these new sails are working for you!
Jason Diffin
sail design

400 or 430 for my weight?

Archived Under Nexus


shipped the 430 Goya 99 mast.  I note on the sail bag that the spec mast is 400.  Eddy (who’s great)

says the 430 should be better for me – at 185 pounds – than the 400.

I have the adjustable head extended out about as far as it can go (~13cm) and using the shortest setting on my extension (12cm).  Downhauled so that looseness in the leech is to the dot (or a shade past).  I could go another cm on the downhaul if needed but I’m trying to follow the specs.

How does this look to you –

Do you think the mast is forward enough in the sleeve?

Do you agree on Goya 430 99 RDM instead of 400?

Just getting my questions out of the way up front so I can enjoy the sail the way you intended.  Thanks.



Mega apologies for the delayed reply,,, I’ve been super swamped getting ready to leave for China (Sunday morning) and trying to get and keep all my ducks in a row….!!!

I believe Eddy did you right, and that you will be very stoked on the feel of that 430 99% mast.

At 185 pounds, you have the weight to load the mast properly and get the flex feel out of it, and also get really good low end drive and stability.

If you were 170 or under I would recommend 400 because the mast will flex a little more easily and give a lighter hand feel. The 5.4 Nexus on 430 for this weight rider will start to overpower a little more quickly than 400.

At 185, you will enjoy the low end drive, great flex feel, range and also usability in larger sail sizes.

Your rigging looks great.
Maybe a little more tension on the foot batten to clean the sail up a bit down there. Too much tension on that lowest batten will make it a little more difficult to rotate (a harder “pop”), so if you feel that, then you know you’ve gone too far.

I see you are downhauled to the dot which is perfect, then just control the power with the outhaul. +2-2.5cm of positive tension (after the downhaul is set) is a good starting point. If the sail feels too powerful or pitchy, just add outhaul in 1cm increments until it fells right. Never over-outhaul the sail because you will kill the power and make it difficult to handle in any wind condition.

The sail can be used with a bit less downhaul and outhaul in the lightest of winds to maximize the low end power.

Hope this info helps Nathan, and do keep in touch and let me know how you go!




Difference between 2014 Nexus and 2017 Mark?

Archived Under Nexus

Question:  I have ordered a 2017 Goya Bolt Pro 115 and a  Goya  Mark 8.5 2017.

I already have the 2014 Goya Nexus 6.4m2, 6.9m2 and 7.5m2. I think the sails are still in excellent condition and are very good.

What difference would there be between the 2014 Goya Nexus 7.5m2 and the 2017 Goya Mark 7.2m2 or 2017 Goya Mark 7.8 m2 Mark, apart from one batten and the sizing differences ?

Would a Goya Nexus from 2014 (assuming it is in mint condition) still have the same power delivery and speed (using the same board) as the equivalent or near to sized  Mark ?

Thanks for your assistance.

Answer by Jason Diffin: Thanks for your mail and inquiry!

Main difference between ’14 Nexus 7.5 (7 batten) and ’18 Mark (6 batten all sizes) is yes, batten count, and also general cut and performance.

Less battens equals less weight, and as I was developing the 3 batten wave concept I realized that my carbon stretch control system was doing so so much to stabilize the drafts int he sails that I basically dropped a batten off every model in the line up.

The sails got lighter, quick on the low end, easier to pump, and easier to handle because of it.
I addition, the ’17 sails have a bit shorter boom (easy handling), they are a bit shorter overall (bit more head roach makes the sails a bit softer and more flexible feeling) and the foot outline are revised to be a bit higher- they close the gap properly, but also stay out of the way a bit more. There is more profile and more twist overall in the ’17 Mark compared to ’14 nexus, and this means there is more outhaul range (more range overall) and better high wind control.
I believe with the lighter weight, and overall fuller profiles, the ’17 Mark will power up at least as well as ’14 Nexus, plus have more range.
Jeez, sounds like a sales pitch,,, but it’s true! We’ve been working hard on the sails…
Hope this info helps Richard.
Any more questions, please let me know.
Let me know how you go!

SDM or RDM for 2016 Nexus?

Archived Under Nexus

Question: I bought a Nexus 5.9 2016. Which mast is better for it, SDM or RDM?

Answer:  Thanks for your inquiry and thank you for choosing Nexus!

RDM and SDM are both good, they just offer different things-

RDM offers easy rigging, softer feel, nice hand contact when sailing, and potentially super strength.

SDM locks more power lower in the sail, which can be advantageous for heavier sailors,,, or sailors who prioritize speed over maneuverability… Also, the increased diameter means thinner wall mast to achieve the same stiffness. SDM masts can be very light and “race-ey”…

Our mast range as a point of reference-

We have a nice 70% SDM on offer for the first time this year- very nice blend of light and strong as our single SDM option at the moment.

Our 90% RDM offers excellent feel, nice weight with excellent strength.

Our 99% RDM is an awesome super lightweight option for flatwater/bump/jump use only- the mast is very light and not meant for breaking waves of any kind… The feel in the hands is electric though- for me this is the next level up feeling in a windsurfing rig,,,, just magical…,,, unless there are waves hunting you….!!! ha ha ha

Another option-
Our 70% RDM is actually lighter than the 90% RDM and offers a great blend of weight, feel and strength.

To find the best option, just have to describe your sailing (aspirations) and plug in the mast.

Hope this info helps!
Please let me know how you go with the mast you choose on the Nexus 5.9…
-and just let us know if there is anything more we can do to help.
Cheers LMLG!
jason diffin
sail design
Goya Windsurfing


Rig the Nexus 9m 2014 on SDM masts?

Archived Under Nexus

Question:  Is it incompatible/hard to rig the Nexus 9m 2014 to SDM masts? Looking to buy this sail, so I’ve read this review (, nothing else found on the internet about the specific 9m sail. I am a little bit concerned about rigging on SDM mast and the difficulty of rigging. And also what kind of bending curve should that mast have?

I weigh 90 kg/185cm-looking for sailing in 10-15 knots, flat to choppy.

Answer: Thanks for your mail and question.

Yes, Nexus 9.0 2014 works well on SDM masts.

Also, that Nexus 9.0 will work well on a range of SDM bends, but the basic target is IMCS-30, bend curve 64% (bottom) 77% (top). It’s OK if the mast you use varies a bit from that.

At your weight and height 90/185, the 9.0 Nexus will be a great light wind engine to get you moving- and handle well when powered up.

Hope this info helps!

Wishing you good winds…

Jason Diffin
Sail Design
Goya Windsurfing


Goya Nexus Compatible with NoLimitz or Powerex?

Archived Under Nexus

Question: Does the Goya Nexus rig satisfactorily on No Limitz Skinnys or Powerex RDMs in the appropriate length? Are your masts considered constant curve or flex-top?

Answer: Goya masts are  considered flex top in lengths 370, 400, 430, and more of a constant curve bend in the lengths 310, 340, 460 and 490. Nolimitz masts tend towards constant curve in every length listed here. So, to answer your question- Nexus requiring 460 or 490 will rig OK on NL, 430 is not as good but basically OK.  Nexus 4.3 and 4.9 really do much better on a Goya mast.


Difference between Nexus 2013 & 2014

Archived Under Nexus

Question: Is there a difference between the 2013 and 2014 Nexus?

Answer: Nexus 2014 is changing from 2013 quite a bit. Materials and shape wise, so sails will have pretty much the same structure as our wave sails. It is looking pretty amazing. We will have shots and renderings soon.



Battens in the Nexus Flat or Round?

Archived Under Nexus

Question: Are the battens in the 2013 Nexus flat or round?


*Composite tube brings stiffness, supporting a smooth, straight, fast airflow release off the leech of the sails.


SDM Mast OK on 2013 Nexus?

Archived Under Nexus

Question: Is the Nexus compatible with standard diameter masts?

Answer: It’s SDM compatible for sizes requiring 430, 460, 490 masts.


Can Nexus & Freesurf be used with SDM masts?

Archived Under Nexus

Question: Nexus and Freesurf Eco can be used with SDM masts? (approx. 5,3 + 6,3 sizes). What is approx. weight of these models and do you have them on stock?

Answer: Freesurf and Nexus are SDM compatible in lengths 430, 460 and 490 only.


Nexus concept for a pure wave sail?

Archived Under Nexus

Question: Assuming you’re on Maui our worlds could not be further apart… today I have been skating the ocean ice with my kids to the closest islands, something we very seldom can do here. Very beautiful but it feels like it will be a long time until we carve bottom turns here again. Thank you for explaining your design concepts. I was aware of the size modifications of for example Guru and similar sails but I didn’t know how dramatic they were in Nexus. With the level of individuality of Nexus in mind, don’t you think it would be possible to expand the individuality even further and apply the same idea in a pure wave sail? I guess that is my original question. For Nexus you have identified three different applications and designed the appropriate size accordingly. If you would design for three applications for a wave sail I can see may advantages compared to selecting a line/suite/quiver (I don’t know the word) out of two or three different sail designs. An example of such a selection from Simmer would be BT5.4, BT4.8, iC4.2, MX3.7, MX3.3. Few sailors I know would dare to make that selection being concerned about different handling/feeling and required number of masts. This is where I see a potential for a new wave sail design, an elaborate design with a similar handling/feeling and as few mast lengths as possible. Such a design could perhaps replace a manufacturer’s need for two or even three different wave sails. A wave Nexus perhaps? Do you think it could be done? Which obvious disadvantages do you see? Why hasn’t anyone done this already?

Answer: The thing to remember here is that what you are proposing already exists.
It is a common strategy, and one I use myself, to choose key sizes from each model to suit your particular needs.
For example- I spend 4 months every summer sailing in The Gorge. I choose the control and easy feeling of the GURU up to 4.7, then go for the direct power ECLIPSE in sizes 5.0, 5.3, then from there I use NEXUS in sizes 5.9, 6.4 and +. This is my standard Gorge quiver, and it also works well when I go to the Oregon coast to wave sail (sizes 3.7 – 5.3).
The 5.3 ECLIPSE uses 400 mast, so that gives me basically 4.2 – 5.3 with one mast.
So what you are asking for is already available- You just have to choose what is right for you from the different models.

Here’s another point regarding why we have 10 sizes in one model-

Take GURU or ECLIPSE again, for example-
You have to keep in mind that I’m designing those sail ranges for people who weigh as little as 50kg and as much as 100kg.
The 50kg rider (and I have quite a few of them actually) may have 3.7 as their largest sail (GORGE), whereas the 100kg rider’s smallest sail is going to be a 5.0, and then they go up in size from there.
It’s an extreme example of weight variation, but regardless of the weight of the rider- they are all looking for the same thing from any particular model- power, speed, control, and durability. So, that’s why the “same” model is available in such a wide size range.

Any more comments, please let me know!

Keep warm…




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