Rule of Twelfths - using it to avoid going aground - Ep 59
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- Опубликовано: 3 окт 2018
- The "Rule of Twelfths" is a rule-of-thumb that we use frequently to decide if a location is safe to anchor or if a passage is safe to do. It only takes a few minutes and does not need tidal curves or templates. All you need is the tidal range and High Water height.
We use the Rule to decide the best passage north from Dublin to Skerries where we get a surprise in the night.
www.saltylass.co.uk/rule-of-tw...
---- Music ----
Morning Sun - Nicolai Heidlas
Royalty Free Music from HookSounds
www.hooksounds.com
Nicely explained, I hadn't considered the shape of the tidal curve before in determining if the rule of 12ths can be applied or not but it makes sense. Thank you.
Thanks Steve 👍
Good explanation again on your chartwork/prep.
Thanks. Let us know if we need to change anything or make a blooper. Thanks for commenting - always appreciated.
We used to walk out to St Pats island and climb the tower..
I thought all the towers were bricked up...
@@SailingYachtSaltyLass they are at the bottom. Up about 3m there was an opening and once you climb up there’s an stone stairs on inside you can go up to roof on…
Something to keep in mind... 😉
excellent- just found your channel - Thank you! - Vin
Hi Vin - I hope you enjoy it. We have videos of two Moodys - a 35 and a 376. We started to make an offer on the 376, it was our "reserve boat", but then we got Salty Lass and we love her to bits :-)
ruclips.net/video/Mt1L5eqkjWw/видео.html (Moody 376 - and you can get a glimpse of the anchor and bow if you are quick)
ruclips.net/video/HbIJi_5M-nI/видео.html (Moody 35)
is 3.6 the range? If 4m is high water?
Yes - 3.6 was the range. In doing the calculations the range is what determines the size of a 1/12th and then you can add or deduct from HW or LW depending on what you are calculating
Ha, watching your time warp. ---.. Xmas!
Let's do the TimeWarp dance - ruclips.net/video/umj0gu5nEGs/видео.html
Thought it was calculated after LW
As long as you know the range you can work it with either HW or LW depending on your needs. The trick is to know how quickly the tide changes each hour
@@SailingYachtSaltyLass and if geographic area totally messes up the flow eg Wexford harbour caused extra 3 hrs flow at Roslare ( not mentioned in pilot guide only by RNLI) the 1st time we were there trying to sail to safety because engine overheated due to kink in fuel line only evident when moving through swell.
@@WavedancerWesterlyfulmar - The rule of twelfths only applies to regular tidal flow areas, so in "oddball areas" like the Solent, Menai or Wexford you cannot use it and need to use the curves in Reeds Almanac
@@SailingYachtSaltyLass has to be solid sinusoidal curve no blips