Dear Windsurfers,
I manufactured my sixth homemade sail. This time I added an additional wing to this sail. Result is one sail two sizes 4.9 m2 or 5.1 m2. Normal sail size is 4.9 m2 however if you assemble the additional wing to this sail, sail becomes 5.1 m2. An additional wing area is 0.2 m2.
Finally, I don't see any important progress in windsurf sail technology since last 20 years except new sail materials. In my new sail I used three extra battens and slots for this wing. To stop the air flow between main sail and additional wing I used CIRT polyester strips. You can see on the photographs black polyester strips. I haven't tested my new sail yet. In July I will test this sail at Aegean Coast I hope this additional wing won't make any surprise to me.
Bye Melih..
Select to expand quoteLeeD said..
Delta sails.
Dear LeeD,
I appreciate delta sails innovation but the concept is totally different. Thanks for your interest.
Waste of time, 4.9 to 5.1.
Simple tuning covers more range.
Worse, you kill the main sail using it all the time.
Just like Delta sails.
How the hell is sailquik going to calculate sail twist on that bad boy 
Keep experimenting i say 
Do it on the whole length of the leach so you can choose between a high aspect and a low aspect ratio sail.
forum needs improvement .. the green thumbs-up bar is maxed out and my green thumbs-up isn't reflected :(
Select to expand quotemelih said..
Dear Windsurfers,
I manufactured my sixth homemade sail. This time I added an additional wing to this sail. Result is one sail two sizes 4.9 m2 or 5.1 m2. Normal sail size is 4.9 m2 however if you assemble the additional wing to this sail, sail becomes 5.1 m2. An additional wing area is 0.2 m2.
Finally, I don't see any important progress in windsurf sail technology since last 20 years except new sail materials. In my new sail I used three extra battens and slots for this wing. To stop the air flow between main sail and additional wing I used CIRT polyester strips. You can see on the photographs black polyester strips. I haven't tested my new sail yet. In July I will test this sail at Aegean Coast I hope this additional wing won't make any surprise to me.
Bye Melih..
Nice work on making that sail, but I'm not sure how much the additional panel will help.
Because it's attached to the loose part if the leach I don't think it would add much active sail area(won't generate anymore lift) and because it isn't one single piece of sail I'm not sure how well you'll be able to tune the sail, it just looks like adding a panel to a loose leach wont helpfully changethe sails profile.
But please let me know if I'm wrong and congrats again on making a sail.
This is a old design from the 80s
It has a zipper along the foot between the foot panels.
Does anybody else think that needs more downhaul? Or was that a typical 80s tuning
Select to expand quoteLeeD said..
Waste of time, 4.9 to 5.1.
Simple tuning covers more range.
Worse, you kill the main sail using it all the time.
Just like Delta sails.
LeeD, bugger off with your negativity, your attitude is the enemy of creativity.
Windsurfing needs people to go out and build their ideas.
Well done Melih for building this and be sure to let us know how it goes. Of course it's not going to be perfect 1st go but that's why we prototype things isn't it ?
I think it's a cool idea!
Select to expand quoteLeeD said..
Waste of time, 4.9 to 5.1.
Simple tuning covers more range.
Worse, you kill the main sail using it all the time.
Just like Delta sails.
It was his time.
You are the person who's glass is always half empty, further you don't realize it can still be filled.
Hey, why don't you dreamers buy a MW sail to match your FRP fin, Manta nosed board, and Zboom?
Or maybe upgrade your beloved Hypersonic with a reverse pointer fin, extreme mast bend sail, and plastic clamp on harness lines.
Don't forget completing your dream setup with breakaway footstraps and releasable harness bar.
Select to expand quotehoop said..LeeD said..
Waste of time, 4.9 to 5.1.
Simple tuning covers more range.
Worse, you kill the main sail using it all the time.
Just like Delta sails.
LeeD, bugger off with your negativity, your attitude is the enemy of creativity.
Windsurfing needs people to go out and build their ideas.
Well done Melih for building this and be sure to let us know how it goes. Of course it's not going to be perfect 1st go but that's why we prototype things isn't it ?
I think it's a cool idea!
But development is created by an honest assessment of the physics and other factors involved, as well as by creativity.
Secondly, Melih said " I don't see any important progress in windsurf sail technology since last 20 years". That seems to be VERY negative towards the work of all the sailmakers who have spent two decades working on modern sail designs! Why can Melih be negative but not Lee?
Select to expand quoteChris249 said..hoop said..LeeD said..
Waste of time, 4.9 to 5.1.
Simple tuning covers more range.
Worse, you kill the main sail using it all the time.
Just like Delta sails.
LeeD, bugger off with your negativity, your attitude is the enemy of creativity.
Windsurfing needs people to go out and build their ideas.
Well done Melih for building this and be sure to let us know how it goes. Of course it's not going to be perfect 1st go but that's why we prototype things isn't it ?
I think it's a cool idea!
But development is created by an honest assessment of the physics and other factors involved, as well as by creativity.
Secondly, Melih said " I don't see any important progress in windsurf sail technology since last 20 years". That seems to be VERY negative towards the work of all the sailmakers who have spent two decades working on modern sail designs! Why can Melih be negative but not Lee?
For me its attitude, Melih may have English as a second language and his comments were not particularly negative more about challenging, but to start your unnecessary and unhelpful comment about something someone has put their heart and soul into (whether a good idea or not , a new idea or not an innovation or not) with a blatant nasty "waste of time" to me is insulting. This sail is beautifully constructed, and as the work of an amateur exemplary. Time will tell if it is a great sail or a dud not one glance at an image and some keyboard warriors nasty negativity.
Hello Melih,
Well done on giving this a try and I am sure we are all interested in hearing how it goes. I am interested in the placement of the panel, is it designed to be a method of increasing power and drive? If so perhaps it would work better lower on the sail. Regarding your sail shaping I am assuming by looking at the sail that it has very little or no horizontal shaping and is relying purely on luff round, is that correct?
If so for your Version 2 I would encourage you to add some horizontal seam shaping to the bottom half of the sail to give it some pre-shape, it is rigging very flat.
I love people who are willing to have a go and try stuff out, great to see.
Select to expand quoteLeeD said..
Hey, why don't you dreamers buy a MW sail to match your FRP fin, Manta nosed board, and Zboom?
Best booms ever - Sail performs better, much better comfort also looks high tech
It's a shame they didn't go mainstream and slowly faded away 
Select to expand quotejusavina said..
Do it on the whole length of the leach so you can choose between a high aspect and a low aspect ratio sail.
Dear Jusavina,
This is just a test sail. If I do that (your idea) sail becomes complicated project.Select to expand quotepeterowensbabs said..Chris249 said..hoop said..LeeD said..
Waste of time, 4.9 to 5.1.
Simple tuning covers more range.
Worse, you kill the main sail using it all the time.
Just like Delta sails.
LeeD, bugger off with your negativity, your attitude is the enemy of creativity.
Windsurfing needs people to go out and build their ideas.
Well done Melih for building this and be sure to let us know how it goes. Of course it's not going to be perfect 1st go but that's why we prototype things isn't it ?
I think it's a cool idea!
But development is created by an honest assessment of the physics and other factors involved, as well as by creativity.
Secondly, Melih said " I don't see any important progress in windsurf sail technology since last 20 years". That seems to be VERY negative towards the work of all the sailmakers who have spent two decades working on modern sail designs! Why can Melih be negative but not Lee?
For me its attitude, Melih may have English as a second language and his comments were not particularly negative more about challenging, but to start your unnecessary and unhelpful comment about something someone has put their heart and soul into (whether a good idea or not , a new idea or not an innovation or not) with a blatant nasty "waste of time" to me is insulting. This sail is beautifully constructed, and as the work of an amateur exemplary. Time will tell if it is a great sail or a dud not one glance at an image and some keyboard warriors nasty negativity.
Dear Peterowensbabs,
You are right English is my second language and my English level is intermediate or upper intermediate not more than that. Sometimes I don't understand people's article. My new sail is simple, practical, easy to use ,standart equipment and sturdy. For the result we must wait July.
Select to expand quoteGestalt said..
whats the theory?
Dear Gestalt,
The theory is very simple, different wind power against to it variable sail area.
Bye Melih...
Hi Melih.
I'd like a variable-area sail since I want to do some offshore cruising, but obviously with sails a significant factor is trying to reduce the amount of variation in the vortex wake coming off the leach. A squared outline as in your sail seems likely to create a vortex, like aircraft wing flaps can;
Select to expand quotemelih said..jusavina said..
Do it on the whole length of the leach so you can choose between a high aspect and a low aspect ratio sail.
Dear Jusavina,
This is just a test sail. If I do that (your idea) sail becomes complicated project.peterowensbabs said..Chris249 said..hoop said..LeeD said..
Waste of time, 4.9 to 5.1.
Simple tuning covers more range.
Worse, you kill the main sail using it all the time.
Just like Delta sails.
LeeD, bugger off with your negativity, your attitude is the enemy of creativity.
Windsurfing needs people to go out and build their ideas.
Well done Melih for building this and be sure to let us know how it goes. Of course it's not going to be perfect 1st go but that's why we prototype things isn't it ?
I think it's a cool idea!
But development is created by an honest assessment of the physics and other factors involved, as well as by creativity.
Secondly, Melih said " I don't see any important progress in windsurf sail technology since last 20 years". That seems to be VERY negative towards the work of all the sailmakers who have spent two decades working on modern sail designs! Why can Melih be negative but not Lee?
For me its attitude, Melih may have English as a second language and his comments were not particularly negative more about challenging, but to start your unnecessary and unhelpful comment about something someone has put their heart and soul into (whether a good idea or not , a new idea or not an innovation or not) with a blatant nasty "waste of time" to me is insulting. This sail is beautifully constructed, and as the work of an amateur exemplary. Time will tell if it is a great sail or a dud not one glance at an image and some keyboard warriors nasty negativity.
Dear Peterowensbabs,
You are right English is my second language and my English level is intermediate or upper intermediate not more than that. Sometimes I don't understand people's article. My new sail is simple, practical, easy to use ,standart equipment and sturdy. For the result we must wait July.
That's where the fun begins
Select to expand quoteNotWal said..
Another approach for variable sail might be to make a sail with vents.
Now you're bumping into my old idea of installing a venetian blind in the middle of the sail, just open or close as needed.
Of course you'd have to modify it a little, but not much. 
It could even roll up with the sail!
Just to complicate things.
why not have the extra panel longer and hinge. Then with some line connected that could open or pull in the flap.
Sort of use kite lines and a version of a kitesurfing clicker bar.
so flaps could be added on the fly.
sure a similar thing is done by an adjustable outhaul, but the above may be a good idea for smaller sails.
