These videos are simply the most easily understood guide to sail shape and performance on the net. Start with the video (not part of the series) on Lift and Drag then follow these videos through from 1 to 4 then repeat as necessary. It will change your sailing from Monkey see, Monkey do, to that of a sailing Goddess or God - well, perhaps a few more sessions on the water, but with this knowledge, you will be a hell of a lot better. Thank you very much for such clear and helpful videos.
James, Thank you for the wonderful feedback. You describe exactly what we set out to do with Sailzing.com. We want to make learning advanced sailing concepts simpler and give sailors who want to sail faster and smarter one place to go for free learning. Thank you again! Please make sure to visit SailZing.com where most of the learning happens.
Thanks for the feedback. We feel your pain. 😉 We have companion articles on SailZing.com that usually document the top points from our videos. You can revisit those for quick glances to remind yourself.
3:29 "this drawing is exaggerated: with batons in the sail you probably couldn't achieve this shape". Wanna bet? Kirby 25, we were clawing behind an island, I was looking at exactly that shape! When I went to adjust the leach line skipper told me not to touch it, that it was perfectly set for when we come out into open air. I wanted to tell her that at the rate we were crawling along that may never happen. I closed my mouth 😁. It's a control: it's meant to be adjusted. My opinion of course.
It will depend heavily on the hull. If you are already reaching the hull speed of a displacement boat with OK trim, then perfect trim will add nearly nothing.
@@SailZing thanks! Ok let me re-phrase my question: in many books like high performance sailing / illustrated sail tuning I read: draft position should normally be around 45-50%. And ideal camber/draft depth is 16% in medium conditions. Where should I measure this / look at the sail? Can i just do it at the easiest place, the boom with a tape measure? Or is it somewhere half-way up the sail, so you have an average?
@@MartijnDesijn It's best to measure at several places. The easiest way to measure is with software, such as SailPack Vision. This is a free download. Take a picture of your sail while sailing upwind, then upload the picture to the software. Draw draft stripes at various heights as instructed in the program. The software will give you the amount of camber as well as the max draft position at each stripe. Hope this helps.
Best explanation of sail shape I’ve ever seen!
Thanks! We appreciate that.
You are the G.O.A.T. man
These videos are simply the most easily understood guide to sail shape and performance on the net. Start with the video (not part of the series) on Lift and Drag then follow these videos through from 1 to 4 then repeat as necessary. It will change your sailing from Monkey see, Monkey do, to that of a sailing Goddess or God - well, perhaps a few more sessions on the water, but with this knowledge, you will be a hell of a lot better. Thank you very much for such clear and helpful videos.
James, Thank you for the wonderful feedback. You describe exactly what we set out to do with Sailzing.com. We want to make learning advanced sailing concepts simpler and give sailors who want to sail faster and smarter one place to go for free learning. Thank you again! Please make sure to visit SailZing.com where most of the learning happens.
Excellent explanation, so understandable. Now my problem will be to remember it in the heat of the moment on the water
Thanks for the feedback. We feel your pain. 😉 We have companion articles on SailZing.com that usually document the top points from our videos. You can revisit those for quick glances to remind yourself.
Thanks for the interesting videos on the sail trim. Looking forward to watch Part 4!
Thanks for the feedback!
Thankyou :) You've put this video together really well, very clearly explained.
Thank you for the detailed explanation. Can't wait for the parts on the foresail and reaching!
You are welcome!
I need advice on the inevitable separation bubble just behind the mast, please explain.
Really, really good.
3:29 "this drawing is exaggerated: with batons in the sail you probably couldn't achieve this shape". Wanna bet?
Kirby 25, we were clawing behind an island, I was looking at exactly that shape! When I went to adjust the leach line skipper told me not to touch it, that it was perfectly set for when we come out into open air. I wanted to tell her that at the rate we were crawling along that may never happen. I closed my mouth 😁. It's a control: it's meant to be adjusted. My opinion of course.
I always wonder the percent increase in speed of an “OK” sail trim vs a very good sail trim. It would be great to see some videos on this.
We'll see what we can find.
It will depend heavily on the hull. If you are already reaching the hull speed of a displacement boat with OK trim, then perfect trim will add nearly nothing.
Very good lessons
Thanks for watching
if you mention: "the draft is 40% aft", at what height of the sail is this measured? boom level, half way, top batten?
The draft position is likely to be slightly different as you move vertically up the sail, so it's not one number.
@@SailZing thanks! Ok let me re-phrase my question: in many books like high performance sailing / illustrated sail tuning I read: draft position should normally be around 45-50%. And ideal camber/draft depth is 16% in medium conditions. Where should I measure this / look at the sail? Can i just do it at the easiest place, the boom with a tape measure? Or is it somewhere half-way up the sail, so you have an average?
@@MartijnDesijn It's best to measure at several places. The easiest way to measure is with software, such as SailPack Vision. This is a free download. Take a picture of your sail while sailing upwind, then upload the picture to the software. Draw draft stripes at various heights as instructed in the program. The software will give you the amount of camber as well as the max draft position at each stripe. Hope this helps.
I'm confused about 11:30. Does tension on the leech help flatten it or hook it?
More tension hooks the leech.
Awesome! Keep it up! Would you like to be CZcams friends? :]