Forums > Windsurfing Foiling

Ezzy Hydra

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Created by Paducah 4 months ago, 8 Jun 2018
Paducah
175 posts
8 Jun 2018 12:26PM
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Not feeling this one
review: 2xs.co.uk/ezzy-hydra-windsurf-foiling-sail/


Maddlad
WA, 263 posts
8 Jun 2018 2:01PM
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Yeah i saw that online somewhere earlier today and it looks bizarre to me.

seanhogan
2928 posts
8 Jun 2018 4:15PM
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not to mention the race ltd model :




The Windsurfing Shed
NSW, 275 posts
8 Jun 2018 6:51PM
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seanhogan said..
not to mention the race ltd model :





Good photoshop skills

seanhogan
2928 posts
8 Jun 2018 4:53PM
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hahah not me, from wind33 (I barely use mspaint )

RichardG
WA, 1855 posts
11 Jun 2018 5:55PM
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I am not a foiler and have never tried it although I am interested in it.

I found this on facebook re the Ezzy Hydra:

"HYDRA: The new windsurfing foiling sail from EZZY Sails:

David Ezzy fell in love with foiling over a year ago: "I got into windsurfing 45 years ago because I loved it. I had no idea that it would take me on the journey that is my life. When kiting came around, I tried it, and I said: nope, not for me. When SUP started, again, I said: nope. But I tried foiling last summer, and I can't get it out of my head. I go every day. I literally go foiling every day. All I need is 7 or 8 knots of wind, and I love it."

Like all Ezzy sails, the Hydra is born from David's passion and attention to detail. The first thing that David noticed about foiling is that it opens up a whole new challenge for sail design. The fundamentals of foiling are simply different than normal windsurfing, which is why the Hydra looks nothing like a normal windsurfing sail.

First off, because the foil can fly through the water with so little drag, the wind angles are different, which means that the apparent wind (the wind created by your movement) shifts forward. Second, you need a powerful sail to pump up onto the foil, but once you're on the foil, you want a very easy to control, light sail. And third, you're above the surface of the water when you're flying on the foil.

The elongated foot on the Hydra takes advantage of the board's height off the water to create a hyper efficient sail. On a normal windsurfing sail, a long foot like this would hit the water when cruising and simply not work, but when foiling, we can take advantage of this "free" space created by flying above the water. The extra long foot forms an end-plate with the board. This is very similar to how winglets work on a jet wing, and aerodynamic theory tells us that an end-plate like this greatly improves the efficiency of the sail. For example, David can ride a 4.0 in conditions he would normally ride a 6.5.

The extra long foot provides the needed low-end power to get up on the foil without using cambers or an extra batten below the boom, saving close to a kilo in weight. Being able to ride a smaller, lightweight sail makes foiling more fun by giving you the sensation of flying with nothing in your hands. You want a sail that "goes away."

The extra long foot also makes the sail more stable. This means that you are less vulnerable to gusts throwing you off balance when you're flying on the foil, which makes foiling a lot easier. But at the same time, because only the foot is extended and not the entire sail, the pull of the sail remains forward for a more comfortable sailing experience. The Hydra also borrows the 3/4 batten concept from our hardcore wave sail, the Taka.

A 3/4 batten allows the sail to luff, which means that it can easily go from full to flat. This is important for many aspects of foiling. This helps the Hydra to be extra powerful when you're pumping it but flat and responsive when flying on the foil. And, the Hydra's 3/4 batten is the reason it can de-power so easily and change its shape for the needs of the foil. When you sail up wind, you want a flat sail, and when you sail downwind, you want a full sail. The 3/4 batten allows both to occur without having to adjust the outhaul.

Overall, we had 5 goals when designing the Hydra and we are happy to say that the design accomplishes each one. The goals are:

1) Must be more efficient than a normal sail

2) Must be less sensitive to gusts than a normal sail

3) Must have early power to get up and going but also controllable when flying

4) Must be able to de-power easily

5) Must be super light weight

The Hydra is a dramatic new look for a dramatic new form of windsurfing.

Available in 4.0, 5.0, 5.5, 6.0, 7.0. In love with the flying of foiling, David is happy to release the Hydra to everyone who already loves foiling and everyone yet to discover its magic."

Seems similar in concept to this Andre Lefebvre Cutaway sail from the late 1980s.



On the Hydra the extra long foot provides the needed low-end power and drive to get up on the foil without using cambers or an extra batten below the boom, saving weight and claimed providing stability. I guess it works better on a foil because it well above the waterline as opposed to on a normal windsurfer, as pictured above.

jimbob SA
SA, 892 posts
11 Jun 2018 9:04PM
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I'll be ordering one soon as they are available, 5.5 for me. I hate big gear with a passion. one sail option on my hover and then normal windsurf over 15 knots. Have used a older 97 ezzys 5.0 and 5.5 last summer ( after trying many later sails ) and it's been fantastic, knowing and meeting David and seeing how passionate he is can't wait to be on the water with his new sail.
Its not all racing and speed but getting out on light warm days with your wife and family and having fun again.
only Robby and Dave seen to get this.



Bought these new in 97 and still bloody good condition.


Paducah
175 posts
12 Jun 2018 1:36AM
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Dave isn't the only one. Bruce Peterson has had a line of foil sails out for a year now and he's a pretty proficient foiler himself. Having used a cammed sail for foiling in light winds after using an Ezzy Cheetah for a year, I prefer his approach.



Bruce is on the yellow/red sail in this vid:


btw, I have huge respect for Dave Ezzy and what his sails do for the avg windsurfer - I own four. I'm just not convinced on this one, yet. I suspect that you could lose 30 cm off that foot batten and have no significant effect on the sail's behaviour.

RAL INN
VIC, 2556 posts
14 Jun 2018 11:10AM
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Loft sails seem to have their fingers on the foil sails as does Sailworks.
both have been at it a while.
For someone to be barely a year into foiling then come up with this radical approach seems like a rush to different rather than a serious study of what really works.

19 Jun 2018 10:57AM
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Paducah said..
Dave isn't the only one. Bruce Peterson has had a line of foil sails out for a year now and he's a pretty proficient foiler himself. Having used a cammed sail for foiling in light winds after using an Ezzy Cheetah for a year, I prefer his approach.



Bruce is on the yellow/red sail in this vid:


btw, I have huge respect for Dave Ezzy and what his sails do for the avg windsurfer - I own four. I'm just not convinced on this one, yet. I suspect that you could lose 30 cm off that foot batten and have no significant effect on the sail's behaviour.


I agree loosing 30cm off the batten might improve handling - adding cams will improve stability. The guys at Sailworks brought out the best qualities in the FLYER.

RichardG
WA, 1855 posts
23 Jun 2018 7:32PM
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The Hydra looks the business out of the bag. Reports may come out of the Gorge on them soon.

CJW
NSW, 1472 posts
24 Jun 2018 1:01AM
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I mean I get it...but I also don't get it. The segment of the market ezzy are going for with this sail is the freefoil end...not the racing market. That thing is never going to win races, it's been proven already you you need big sail area and effecient foils (read cams) to be fast racing. Ezzy's have always been Super stable, bomb proof wave sails and this translates well to the freefoil market...I guess Dave just added 'end plating' for market differentiation?

RichardG
WA, 1855 posts
24 Jun 2018 6:34PM
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CJW said..
I mean I get it...but I also don't get it. The segment of the market ezzy are going for with this sail is the freefoil end...not the racing market. That thing is never going to win races, it's been proven already you you need big sail area and effecient foils (read cams) to be fast racing. Ezzy's have always been Super stable, bomb proof wave sails and this translates well to the freefoil market...I guess Dave just added 'end plating' for market differentiation?


Would not the free foiling end be where the market is ?

If Kevin Pritchard enters a foiling race he may well win using a Hydra.




CJW
NSW, 1472 posts
25 Jun 2018 4:24PM
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Yeah you're right. I guess I was surprised they were trying stuff like 'end plating' which is more of an Americas cup or Moth kinda deal, not something most people who use a sail for free foiling are going to notice/care about; Reason I say this is you're talking super marginal gains right at the top end of the performance envelope.

I mean they claim other performance benefits but the claim you can use a 4.0 when normally you'd use a 6.0, I call BS. And Kevin is never going to win a foil race on that sail on the PWA tour unless it's pure survival conditions and he's the last person standing.

Don't get me wrong, love the initiative and Ezzy has never followed the crowd but it smells like pretty heavy marketing spin to me, which is why I mentioned market differentiation

RichardG
WA, 1855 posts
25 Jun 2018 2:39PM
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CJW said..
Yeah you're right. I guess I was surprised they were trying stuff like 'end plating' which is more of an Americas cup or Moth kinda deal, not something most people who use a sail for free foiling are going to notice/care about; Reason I say this is you're talking super marginal gains right at the top end of the performance envelope.

I mean they claim other performance benefits but the claim you can use a 4.0 when normally you'd use a 6.0, I call BS. And Kevin is never going to win a foil race on that sail on the PWA tour unless it's pure survival conditions and he's the last person standing.

Don't get me wrong, love the initiative and Ezzy has never followed the crowd but it smells like pretty heavy marketing spin to me, which is why I mentioned market differentiation








Yes I am interested in this foiling game but am not a foiler yet and your comments do support one interpretation of the innovation but the proof will be in the handling and speed on the water. I would defer to you on the foiling theory. I guess the jury is still out on this innovation. I don't believe Dave Ezzy would promote this unless it had technical benefits, but I could be wrong of course. He could easily use the Taka 4F "modified" or an Ezzy Lionfoil modified and release just another foil sail. He "does not do fads" and I suspect didn't see the benefit in repackaging and rebadging an existing sail like many others might, and I am not suggesting any sailmaker has done that in any event. I think Ezzy would be seeking a step change. It pays to remember he was one of the first fully battened sailmakers along with Malte Simmer of Simmer Style and Monty Spindler of NP, as he then was.

RichardG
WA, 1855 posts
Thursday , 11 Oct 2018 8:34PM
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Cluffy said..
www.ezzy.com/sails/2018-sails/ezzy-hydra/

An interesting approach indeed. From a noob/freeride foiler point of view I like the soft section and the idea behind the long foot batten but I don't know if it needs to be that long lol. Ezzy have never been afraid to think outside of the box but they are a long way from mainsteam on this one. I think I get where they are coming from though. The hydra looks like a very noob friendly foiling sail.



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RichardG said..
TESTIMONIALS (from Ezzy website)

Sailed the Hydra 6.0 yesterday. Light north east wind 8-17 mph. Starboard formula 158.I rigged the sail in the shop when I first received it and it looked small for a 6.0. (probably because of the shape). Yesterday, rigged it and was pretty sure I would be right back in for a 7.5 (it really looks small). This sail is extremely light, making it very easy to handle and pumping takes a lot less effort (same with uphauling).Pumped it up on a plane (which did not require that much effort, much to my surprise). I was able to set the Hydra, lock in, and start driving with my feet and slight body movements. I was able to keep the foil at the level I wanted and sustain it with very little effort.I think not having so much weight aloft is a hell of advantage (really reduces the pitching moment) for being much easier to handle. Anyone can balance a 6 ft dowel on their nose, add a ? ounce lead sinker to the end of the dowel and it is impossible. For beginners like myself, I think this sail is a must have. Because you can set it and concentrate on body movements to maintain foil height and drive the board. In my opinion after sailing the Hydra, I think the traditional windsurf sail allows way too much sail movement for foiling. The hydra will pretty much set itself and allow you to concentrate on driving with your feet and slight body movements.-Shawn Kempton, USA

Been using the hydra in Greece. Yesterday, no one else on the water was planing. Other foilers were trying to plane on 6.5 5-batten rigs- regular windsurfers on 8.0's not planning. I was using the 5.5 Hydra and flying-- could not believe it .It's interesting windsurfers just don't believe you can foil with a smaller Ezzy Hydra sail ....Many non believers to be converted.Once you are going, you don't really need the harness. It was like flying across the water.-Simon Basset, UK

Sounds good.


Following this with interest.

RichardG
WA, 1855 posts
Thursday , 11 Oct 2018 8:43PM
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David Ezzy and Kevin Pritchard make some interesting comments on these sails.

It appears Ezzy has made his own personal foiling boards and is quite enthused.

Using starboard foils.





jimbob SA
SA, 892 posts
Friday , 12 Oct 2018 8:54AM
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Hey Richard I'll have my 6 metre in a couple weeks and let you know my impressions.

RichardG
WA, 1855 posts
Friday , 12 Oct 2018 7:29PM
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jimbob SA said..
Hey Richard I'll have my 6 metre in a couple weeks and let you know my impressions.


Thanks Jimbob. David Ezzy emailed me the following overnight, it would be interesting if you could please, consider these points when you gather your impressions:

"I prefer the Hydra over the Lion [for foiling]. I made a two cam version of the Hydra, but I like the current, no-cam Hydra better. I have also tested a camber below the boom on the Hydra and found it was not better.

Here are some of my thoughts:

1) For foiling, we need two sails in one. First we need a very deep and draft forward sail to get us going in the light wind. Then once flying, we need a flatter sail because the apparent wind shifts so far forward.

2) The hydra can be rigged incredibly deep for light wind. Much deeper than you can rig a cambered sail.

3) The hydra luff can "deflate" when up and flying and you don't feel any disturbance.

4) Even if you could rig a cambered sail as full, it would be a handful when flying, so you would need to pull very hard on your adjustable outhaul to flatten the sail.

5) If you overly flatten a camber sail, the cams end up de-rotated and the draft is further back.

6) Another interesting thing that I notice with the hydra when set very full, is that the luff is "deflated" at the boom, but not above. This indicates that the apparent wind angle is less at the bottom of the sail, than it is above. We know this is because the [true] wind speed increases as you go up off the water. Which also means the apparent wind angle gets greater as you go up the sail. So this indicates that we need a more forward draft (and twist) higher in the sail. The Hydra is able to 'self adjust" by luffing in the boom area and remaining full in the upper part of the sail. [See diagrams at the foot of this post]

7) I think the biggest speed limiter right now with foiling is the foil itself. This is because the induced drag of the foil increases with the speed.

8) That is why in strong wind a slalom board is still faster than a foil, because a normal windsurf board does not have to deal with induced drag.

9) But, if you look at it this way, you see that the sail on a foil is not so much the speed limiter, as is the foil.

10) Furthermore, applying normal windsurfing sail theory for racing sails, i.e., cambers, may not be the right approach when it comes to foiling.


For me foiling is all about the speed off the wind and into the wind. I line up with the guys on cam'd sails foiling and I am not seeing that they are going faster, or pointing higher, in fact I am finding just the opposite."




jimbob SA
SA, 892 posts
Saturday , 13 Oct 2018 5:17PM
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Richard isn't it great how Dave who owns the company will get back to anyone who emails him. Had a great conversation with him last week about why the Hydra doesn't have his signature vinyl window, apparently l was the first person to notice this. If you're ever at Kanaha sailing with a ezzy he will have a talk and check you have it rigged properly and give you any pointers.

RichardG
WA, 1855 posts
Sunday , 14 Oct 2018 10:38AM
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jimbob SA said..
Richard isn't it great how Dave who owns the company will get back to anyone who emails him. Had a great conversation with him last week about why the Hydra doesn't have his signature vinyl window, apparently l was the first person to notice this. If you're ever at Kanaha sailing with a ezzy he will have a talk and check you have it rigged properly and give you any pointers.



Yes he is great and excellent at customer service and technical advice.



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"Ezzy Hydra" started by Paducah