Sailing Theory Tutorials - Introduction to Tides

[@howarthsailing]

Hi Everyone, I made some changes to my channel this winter that resulted in YT deleting all of my comments/replies on these videos. It's really a shame, because I feel like I have answered quite a few theory questions in the comments section over the years. If you have a question, even if it looks like it's been asked before, please don't hesitate to post a comment, I'll do my best to get back to you. Cheers, JH

[@christianmarston1362]

Great series of videos Julian. I've been binge watching and it is obvious that you have put a lot of thought into how best to explain so many different technical concepts. Thanks for taking the time to share your work. I think it's great.

[@ccjerrems]

Well done. Very well explained and illustrated. Much appreciated

[@colorocko1]

That was absolutely fantastic, thank you!

[@nicholasjohnson6724]

I won a lot of races at my local club, simply by staying in and out of the tide.

[@richardellard]

This video unfortunately follows common misconceptions about tides (see PBS Spacetime's video on the subject), so the explanations given here are incorrect (you can kind of see the logic start to break down when considering the moon and sun on opposite sides of the earth). Despite this, however, this playlist remains the best explanation of the physics of sailing that I have found (note, for example, the creator avoided the common "air must flow faster along the leeward side of the sail, because it's curved, etc. etc. Bernoulli" fallacy.) Overall, an excellent playlist and I learned a lot from it!

[@howarthsailing]

Thanks for the comment, with all due respect, I believe that my presentation is in line with the material presented here: moon.nasa.gov/moon-in-motion/tides/. I would say tough that the NASA page a higher production quality. I tried my best to avoid the common misconceptions when I recorded these videos, though I'll admit the work is a little stale, I don't know exactly what you'd like to see different in this one.

[@richardellard]

@@howarthsailing In the link you gave, they mention the tangental tidal forces on earths oceans; these tangental forces are essentially responsible for the bulges in the earth's oceans, rather than the tidal forces which act along the earth-moon line as you described, indeed these latter forces would treat all objects equally, and would not only apply to large bodies of fluid; the reason we do not see objects levitate at high tide is that these forces are negligible compared to the earth's gravity. I agree that the website you linked could have put more emphasis on this point. It's a subtle point not appreciated even by most physicists. I would certainly not call your work "stale"; it's an excellent resource.

[@howarthsailing]

@@richardellard You're absolutely right, I neglected the tangential forces.

[@armagan2613]

Thanks a lot

[@sailorzuzu953]

thank you I wish you were my teacher and not the useless prof I have

[@stuartbluefield769]

Might I please ask a very ignorant, amateurish question? For the sake of some medieval research I'm doing ... for example, I'm sailing from a port on a tidal river to the open sea, and assuming a boat where hitting bottom is not a concern .... would I want to leave for the sea with a low tide, since it's going OUT and would not fight me? And conversely, when I want to come back into the river from the sea, enter at high tide, which presumably helps push me in? Apologize for this terribly uneducated question.

[@howarthsailing]

3 considerations come to mind. First is water depth, but you said that's not an issue. The second is speed, the boat will move faster if it is going with the tide (i.e. coming into a bay while the tide is flooding, between low tide and high tide, coming in, or leaving a bay when the tide id ebbing, between high tide and low tide, going out. The third is manoeuvrability. If you have to dock on a pier, depending on the direction and speed of the tidal flow it could help you, or it could make the task harder/more risky.

[@stuartbluefield769]

@@howarthsailing That is precisely the kind of information I was looking for. Greatly greatly appreciate the reply. Take care.

[@zengirl43]

Is anyone else having a problem with the sound?

[@backwaters3660]

Great!

[@SailHosailing]

I like it

[@MisterSolitude]

This diagram is not to scale. LOL