This is ‘ridiculously’ great!! Fantastic data & graphics. Brilliant! Will be sharing in comments on other YT videos; hopefully more people will find this. Thank you!

@jamesconger8509

Жыл бұрын

Thanks. Appreciate the posting. Not many sailors find these videos.

@brycenew

Жыл бұрын

@@jamesconger8509 You’re welcome James. Maybe adding new or modifying existing hashtags might assist people to find the series? All the best!

Just want to add my thanks for this really illuminating presentation. The explanation of backwinding alone has transformed my understanding of that issue.

@jamesconger8509

3 жыл бұрын

Thank you. Must admit to having spent some time Wednesday backwinded, but I put another reef in and the boat calmed down. Tango knows what she wants, and will pester me until I do it...

This has helped my understanding of a jib immensely. Thank you.

James, very valuable class for really understanding all that stuff. great explanation and compared to most online sailing lessons your is the best !!! thank you and hope, we get some more of your time and teaching Franz Austria

man recorded a sailing tutorial through a conch shell, that’s dedication

@jamesconger8509

2 жыл бұрын

Thanks for this note. I inspired me to do a new video with better sound that I posted yesterday. Back when those slide decks were put up I was just using a cheap USB microphone. I didn't expect the slides to get much attention.

James, your time and knowledge is a great gift to all of us sailers interested in really understanding and looking behind .... goosebumps when your eyes are seeing the reality. ..... thank you , probably the best education i ever got regarding sailing !!! good luck Franz

@jamesconger8509

4 жыл бұрын

Thanks for the kind words. Fair winds.

This is awesome! If you make more of these my only reccomendation would be to add lines to show the no-sail zone. 😀

@jamesconger8509

Жыл бұрын

Thanks!

this video is an excellent example of what NASA's Glenn Research Center labels "Incorrect Lift Theory #3". The shame is that the illustrations where flow lines are shown actually give a good indication of the actual lift sources, and at 8:59 for example you can see how jib improves sail drive by keeping flow attached to the mainsail and improving the overall redirection of the airmass.

@jamesconger8509

3 жыл бұрын

www.grc.nasa.gov/www/k-12/airplane/wrong3.html for those interested.

What an amazing piece of work.

@jamesconger8509

3 жыл бұрын

Thank you.

@alans172

3 жыл бұрын

It would be great if you could take a look at the questions I sent to your yahoo email account.

Amazing! Great work!! But your simulation result holds true when sail is rigid, while it is actually not. So Bounolli theory does not apply here. What really works is just the component of direct force from wind blowing.

@jamesconger8509

Жыл бұрын

Bernoulli's relationship applies to any moving fluid across any surface, even a flag flapping in the wind. The pressure differentials do cause the sails to change shape, so the simulations try to capture the shape at the sails when in use.

Hi James. Thanks for this, I have just discovered this video. Instead of reefing the mainsail, would a smaller jib not reduce the backwinding on the main? What I am noticing on my masthead rig is to reduce jib size and twist off the top of the mainsail. Your feedback would be appreciated

@jamesconger8509

Жыл бұрын

A reefed jib will reduce back winding the main. However, it will not help moving the center of effort forward to counteract hull forces rounding the boat up. I put two reefs in the main before rounding up my 110% jib. One exception might be if you had a huge jib out. I would reduce it to about 100% first, or better, drop it and get a smaller jib out.

Really interesting and non intuitive effect of the mainsail on the jib air flow and pressure. One would think that the jib would be unaffected by a sail aft of the wind.

@jamesconger8509

2 жыл бұрын

You're right, it is not intuitive. Even more unexpected to me is the effect the jib has on the air flow ahead of the jib itself. Pretty amazing machines we sail.