The Turning Tide. Tom Cunliffe on the relationship of the tide and the moon.
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- čas přidán 21. 07. 2020
- 'Working tidal heights without tables' is really an introduction to the videos on my website www.tomcunliffe.com where the whole subject of tides is tackled in detail.
#tide, #sailing,#yachtmaster,
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That was brilliant! Who knew you could look at the moon, add multiples of forty minutes and know which way the tide would be running out at sea?! If you have more of this type of deductive observation please pass it on Tom! Great stuff
Hi Phil. So pleased you enjoyed that vid. Tom
Tom, the tide difference in the SW (Dartmouth) is due to the funnelling effect of the Channel. The tapering coasts of southern England and France are just at the right angle to manipulate the flood and ebb 6 hour cycle. Add in the Isle of Wight as a damper and this gives the double high tide at Southampton. The SW is not really affected by this as it is in the entrance to the Channel. A similar, but different dynamic creates the Severn Bore at Bristol with its tapering effect of South Wales and North Devon. Also note the 'turkey feathers' vanes used on a jet engine tail pipes to manipulate the gas flow and vary the thrust vector with/without afterburner. Also the tuning of racing two-stroke engines with expansion chambers to create a 'standing wave' to boost engine breathing. Water and air are both fluids so the same principles apply. PLEASE reply along the lines of ".. I did not know that" so I can claim Bragging Rights in the Solihull boozer and give me some sort of cred when by Brummie accent is sniffed at by you southern sea folk. PeterC, Captain, Birmingham Navy. (Solihull)
Ahoy Captain. You have been awarded the Order of Bragging Rights - but not by a southern sea folk. I'm from even further north than you, born on the banks of the Mersey. Seriously, a very interesting comment on the tides. Many thanks Tom.
your words are taken from a book, not yours of course.
@@TomCunliffeYachtsandYarns Same up here on the Yorkshire coast. Many years ago, as a Physics student, naively imagining I understood the tides I glanced at the moon and confidently announced to my friends that we were on a falling tide. Much mockery ensued a few minutes later when the North Sea chased us back up the beach and into the pub. Only years later, having become interested in sailing- thanks to some of your books, by the way- did I understand my mistake. The tide is essentially a tremendously long wave, of a set period, which is excited and kept in motion by the moon. But just like any wave in a confined space, in the north sea and the channel you get standing waves out of phase with the driving force. In effect, the north sea and the channel are just sloshing back and forth in response to the tides in the north atlantic. Much more complicated, and more interesting, than I'd ever imagined!
I'm going to have to watch this again and dissect the technicalities. I never knew you had a website Tom, so I checked it out! Amazing photo's!
Thanks Tom. Look forward to seeing more on your website.
Thanks Tom, keeping me sane in my isolation
Enjoyed, Thx Mr Tom! I recall boats alongside in Beaulieu......never had the cojones to bring my Rival in however! Will watch your other down-to-earth tide related videos! Thanks, Andrew
Beautiful boat, treasure of advice.
Good Morning Tom from Wellington New Zealand.
Brilliant. Thanks
As always, it’s a pleasure listening to you.!
Warren s/y Legend
Another great video Tom!
Best "tide" story I ever heard was from an engineer at a boatyard on the Exe in Devon. A chap shows up at the yard and buys a powerboat on a trailer. Launches it the next weekend and he ties up alongside the quay in Topsham at high water and goes for a few drinks. Comes back and the boat is hanging by the cleats fore and aft with the starboard side about two feet above the water. He calls the boatyard for help and they send the engineer. Engineer says to boat owner "didn't you know about the tides?" Owner replies "I knew they came in and out, but I didn't know they went up and down...".
Cracking anecdote. Love it Daniel. Thanks Tom
I really love this videos, in this fast times of technology dependence witch are really helpful of course. it’s really important to know and identify what nature is doing, like the sailors in generations before us used to do.
I grew up at The Baltic Sea. There isn't any tides here. So tides as a phenomenon always fascinate me. How, when, numbers.... I love it. Thank you for straightforward explanation. Aleks
All good stuff Tom. There will be the odd sailor out there who might end up neaped if they dry out at the very height of the tide. I always made sure I took to the ground just before high water - say if picking my slot on Lymington slip - and also that I was happy that the weather next day wasn't going to leave me there due to an offshore wind and / or a high pressure zone building. Loved bobbing around the Solent before I headed to the West Country! Bucklers Hard is an absolute gem.
Enjoyed that video Tom 👍👍 sitting here studying the tides for Belfast and your bang on with the springs being mid day and at midnight night... give or take 10minutes.
Thank you !
I'm a big fan of this channel. It has everything you need. Interesting stories, facts, and a fascinating history about seamanship. Boat Yard is great also . Especially to see Tom with a younger man's face .. cheers
Many thanks Joey. Good to hear you're enjoying it. Have you signed up for my club at www.tomcunliffe.com? You'll find loads of articles and how-to vids on there which are only available to members. Tom
There’s a couple of marks on the north wall in Ilfracombe, Devon where I lean my old Trapper, works every time...first mark is about a ft and the second is bottom lined up about mid ships on the gunnels!
Haven’t been down for a few years now so must make the effort soon...
Appreciated stories! Keep it up! Well done!
Thanks Jay. Another one being shot today. Tom
Made me smile from ear to ear. i.e. Around or just after full moon at noon the water will get up to the top seam = Highest point of the tide.
In the modern world :
Now if you look on the index page you'll find a reference to........ (don't get me started on the instruction manual for the chart plotter...) Great video. Keep It Simple.
Hoofing!
The power of the moon.....
For several months, I plotted my wife's mood swings against my tide tables using the traffic light colour code. I then found a correlation of about three green days, twelve red, rest Amber, per month. I then only went to divorce settlement meetings on the green days and saved thousands! I kept my boat, my Land Rover and the house!
CHEERS from CANADA! Top of the milk to ya. ( something I learned from watching Coronation St. as a a kid )!!!
Really enjoy your videos Tom.. this one takes me back to my short time at Bucklers Hard. Please keep posting!
Thanks Jonty. I'm off to my boat on Saturday and will be posting some more vids from Denmark. Tom
In east Africa fishermen have their own tidal calander, in which they literally count the 'number of moons'. They count the number of days from the last new moon. From that they can figure out when the next high/low tide will be. They are usually very accurate.
Great video Tom. As always.
Thanks for watching Pete. Tom
Good morning to you sir from wellington Somerset
Some years ago I careened my 19' full keel daysailor at my yacht club in New England. I asked the dockmaster who approved my request, though, as it seems, without really understanding it. Later the club manager was heard to ask "Do we allow that?" To which he replied "I don't know. No one ever asked before." Well it happened that another boat sank in her slip down the dock a way the same day, so there was a parade of spectators watching me on their way to the carnival. Comments ranged from "You know you'll be on the bottom there don't you?" to "What sort of bottom paint is that? It looks brand new!" (It was.) Later someone came by and stopped to watch, finally commenting, "I haven't seen that done in a while!" If you guessed he said it in proper Queen's English rather than American, you would be right!
Hi Tom, I live in Stockholm, Sweden now with only a few inches of water height difference due to air pressure, but this definitely reminds me of fighting to get into Poole harbour with a 6 knot spring tide against use racing for the Poole bridge at 18:30. Good memories of tide. Cheers, Chris
Hi Chris. Last night I hosted my Q&A session for my club members. One of the questions was by a Swedish guy who wanted to know the difference between sailing in Sweden and the UK. Top of the list was tides, closely followed by the price of marinas. All best Tom
Very interesting episode! We also have big tides in the coast of Nova Scotia, Canada. Cheers!
You certainly do Dan. I believe the Bay of Fundy has the largest in the world? Certainly up with North Brittany and the Bristol Channel at up to 50 feet. Tom
Eyup from Derbyshire. The only time we get high tides in the Heart of Derbyshire is when one of the dams on the Derwent gives way or someone left one of the lock gates open on the Trent and Mersey Canal!
I used to sail out of Eling Creek, at the top end of Southampton Water. At the entrance to the creek was an old wooden post, which must have been used in former times to warp vessels out into the River Test. I always knew when I was coming in that if there was water round the base of that post I could get straight on to my berth. But I would never have done without the little blue book of tide tables published by ABP Southampton, full of fascinating stuff about the real reason for the double tides in Southampton Water, etc. I bet you've got one, Tom, if they still do them.
Nice video
I used to moor two miles up river. The channel always had enough to float my 8’ draft, however the bay was not so cooperative. Sailor beware 🤠
good gods that's a keel. wow!
Super job Tom I appreciate the video PS now I know how tall you are....😃
Lucky you, here on the Texas coast you get only a foot or so of tide. Actually can catch you unawares when anchoring close to with current and weather adding or subtracting more than that.
This is Stephanie and Kathryn we love your videos, one day we want to cross the pond and visit England, we love you so please boatman please post more videos
Hi Stephanie and Kathryn. So pleased you love the vids. I'm now on my boat in Denmark and will be making some more very soon. Hope you make it to England very soon. Tom
i've been catching bass for fifty years Tom..always know what the moon's doing
You fisherman always know about these things. Tom
Put my bilge keel boat on the hard at Brightlingsea this weekend to give the boats undersides a good clean and fit new anodes. It's hard compacted gravel but has a good 6" of east coast mud on top. Laying in the thick mud while doing underneath between the keels, it really isn't as bad as you might think. Old T-shirt and some swimming shorts, it's quite therapeutic and only takes a dip in the water to give it a good clean off. Then just sit on the boat, having a coffe and some lunch waiting for the tide to come back. It's not sailing but it's still enjoying time outdoors with the boat. Watching the comings & goings in the harbour at the weekend for several hours is also very entertaining!
There's something satisfying about working with the tides, isn't there Andy - even if you are lying under the bilge! Tom
I live in a small fishing village village in Newfoundland. Anytime I have have a chat with the guys down on the wharf, the first thing they talk about after the 'How she goin', b'y"? is the wind. What direction it's coming from, where it came from yesterday, what they know it's going to do tomorrow, and how it'll affect the cod or lobster or crab. The way those guys can read a sky, the wind and know how that affects the fish is amazing.
Very good to hear from Newfoundland. I was last there, in my 1911 pilot cutter. We made landfall at Griguet, in 1983 and stayed two weeks.. It was the end of my Viking voyage (now in audiobook form on my website). The locals took us to their hearts. All best Tom
@@TomCunliffeYachtsandYarns I'll have a look for your book, thanks!
Grown up on the Waddenzee i do know the tides very well ;)
I'll bet you do. They can certainly run fast there and you don't want to be caught out by them. Tom
Interestingly tides have been getting smaller over the earths life time, as the energy used to slosh that water around the earth generates friction and slowly slows down the spinning leading to the moon moving further away (by conservation of angular momentum) the dinosaurs (and earlier) would have had enormous tides to deal with!
I remember neap meaning 'without power'. Quite big tides up here in the solway. 1/4 moons = neaps and full/dull moons being springers. Highs around 2 days after full/dull moons.
Hi Brann. Very interesting. I hadn't heard of that meaning of neaps, but it makes sense of the word now. Many thanks Tom
It's a very fascinating subject. I enjoy it all very much. Thanx Tom.
Nice one Tom. What always confused me was the tide in a marina or harbour goes up and down but on a beach goes in and out
it's all to do with contours!
In the early 1970s I dated a farmers daughter in Suffolk (I'm a London boy). I thought I would get some local folk lore about the weather so I asked her dad "How do you know what the weather is going to do?" He looked at me as if I was simple and said, "I listen to the weather forecast on the radio." Hahahah, the old bugger must have thought I was simple.
Nice one! What happened to the farmer's daughter? Tom
Tom do you have any logs of sailing in the Chesapeake? Where & what years?
Just curious. Thanx
Yes Keith. I've sailed in the Chesapeake a couple of times when transiting the Intra-coastal waterway. That would be about 1977 and 1983. Tom
💪🌕👍
Dylan Winter used the local tides to get a free ride up the local rivers in his Keep turning left series.
of course it will always be deeper at the deep end of the pool,
Tom, could you please explain this to flat earthers
They were required to vote on the introduction or otherwise of daylight saving in our state. It was rejected because the cows in Mount Isa would get confused. So we have a different time zone to people 50 miles south of here for summer. I can't tell you how much fun it is to get up at 3:30 am to fly to an 8:30 business meeting down in Victoria, arriving back home at 10:30pm.
Sounds like the wonders of Democracy! Tom
The biggest tided at Newhaven are 7.3 metres
💪🌝🌚👍
3:25 the moon, sailing through the clouds👍 the earth is flat Tom🙌🤫
So why is it the night in Tokyo when I skype my nephew and it is midday here? What causes the tides? Why is the moon and all the planets spherical? What causes gravity? How does celestial navigation with a sextant and tables calculated for a spherical earth work? Where is the ISS going when you can see it most nights passing over? Why do airlines use great circle routes? Why do temperatures rise as you go down deep mines or drillholes? Where does lava come from? If the earth is flat, how thick is it? Does any physicist, astronomer, navigator or engineer care what you think anyway? No!!
@@karhukivi
George, you need to provide supporting evidence if you wish to push your "the earth is round" theory. And just supposing you theory was entertained, what is going to stop all those people living on the bottom of the earth from falling off!
@@karhukivi That's what's they want you to think.
@@GlenT1D And just who is "they"? and what is their motive? Anyway it's what we know!!
@@bradmale9989 Nice try! But is the outrageous notion you believe in that needs supporting evidence, of which there is none. Gravity is what keep us all on the planet. If it isn't then why don't we just float upwards? The laws of gravity were known more than 300 years ago and work for all things, stones dropping down wells, bullets and missiles fired upwards, planets and moons orbiting planets. And you think we live on a pizza? You didn't answer a single one of my questions, but it doesn't matter as your opinions are only shared by a few.
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Tom, thanks for posting this interesting video.
Would you please, please, get the person operating the camera a tripod.
Anything, to stop them waving the image about like they were conducting an orchestra.
Thank you.
Every second Sunday or the summer HW Portsmouth is around lunchtime. That’s allows a freedom in my description of lunchtime....
But come 16:00 the world and his wife are coming back into Portsmouth Harbour. So if you get a socially distanced beer at the Still & West you can watch those with the larger engines (me - he said trying to hide a wry smile) slip quietly into the Small Boat Channel and then followed by the owners of the ubiquitous Westerly Centaurs and the like (usually 10hp single cylinder diesel) who thrash their engines till they smoke like the devil in the desire to beat the ebb tide that they knew would be strongest at their chosen time of return.
I know time and tide wait for no man, but those entering Portsmouth Harbour seem to let it slip from their minds as they endeavour to follow the clock (“I must be at home by six”).
If you want a spectator sport that equals watching berthing in any marina I urge you to visit Old Portsmouth and the pubs to give yourself a perfect view of young Mr Cunliffe’s tidal observations.
Hi Phil. I know the Still and West well. Used to drink in there a lot when running courses. Love the photo of HMS Vanguard on the way to the gents. Grand spectacle! Tom
Before tide tables? You don't look that old Tom.
Better not ask bill o'riely....
Beautiful boat, treasure of advice.