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Search took 0.00 seconds. Search: Posts Made By: barnakiel
Forum: Anchoring & Mooring 31-07-2020, 10:36
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

OK, but just when it is 'practically impossible to straighten out' it stops acting as a cushion and starts acting as if you were tied to a rock with a short piece of wire.


So whether the chain...
Forum: Anchoring & Mooring 27-07-2020, 10:04
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Yes.


Mind it is a bridle in one case, but another case will have chain all the way to the surface - some boats opt for 'chain only' rodes. (=99% chain 1% snubber).


I think chain may have a...
Forum: Anchoring & Mooring 27-07-2020, 09:40
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

No problem. Looking forward to hear what you find when the calculation is updated with the density figure.


barnakiel
Forum: Anchoring & Mooring 27-07-2020, 09:35
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

OK. I see. The energy of the boat is this order much bigger. We will feel plenty of drag when handling the rode (e.g. rowing an anchor off in a dinghy,) but when the rode is pulled by the boat,...
Forum: Anchoring & Mooring 27-07-2020, 07:57
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Mathias,


Imagine you are filming a nice anchorage with clear water FROM A DRONE - on a very windy day.


What will you see? Well, as boats sail from side to side, most of the time their...
Forum: Anchoring & Mooring 26-07-2020, 17:01
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Oooppss.


'The German engineer'. But is that not YOU?


I mean the person who did all the mathematical wizardy with chain.


barnakiel
Forum: Anchoring & Mooring 26-07-2020, 08:32
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

@ OP


Have you allowed for the fact that the rode is most of the time not just 'in catenary' but also curved in the horizontal plane?


I mean, we are getting some amount of cushion effect...
Forum: Anchoring & Mooring 26-07-2020, 08:29
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Yes. Explaining to others things that we seem to understand natively ... from thousands of repetitions (aka experience). Not easy.



Studying cryptography (basics) I came across this example:
...
Forum: Anchoring & Mooring 07-07-2020, 07:37
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Yes. Looks excellent solution.



b.
Forum: Anchoring & Mooring 06-07-2020, 16:05
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Quite possibly a cell can be wired onto an Arduino.


This would make reading and logging easy.


b.
Forum: Anchoring & Mooring 05-07-2020, 18:35
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

It could be very beneficial to get load data from boats anchored in various conditions.


Something is telling me there may be a quality shift rather than only quantity change as the wind goes up....
Forum: Anchoring & Mooring 05-07-2020, 18:16
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Yes.


Just think stretch is a % of load, so a fat one needs that extra length you mentioned.


If I assume 10% elongation (and is this a realistic elongation of say a nylon yarn?)


then to...
Forum: Anchoring & Mooring 05-07-2020, 16:09
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Lucky U - a monohull has many advantages.



But now you have the bow on one side and plenty of stretch (some from chain, some from the extra 2 m stretch in the proposed snubber) the wind will...
Forum: Anchoring & Mooring 05-07-2020, 13:50
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

However, anything that stretches 2 meters, adds 2 meters to a very unwelcome ability of some boats to sail to and fro, with their bows getting even further blown off the wind line.


Getting off...
Forum: Anchoring & Mooring 17-06-2020, 16:23
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

As much as possible, excessive rope should be avoided - especially in heavy conditions.


The huge disadvantage of plenty of rope is that now you you have too much of that bungy effect, the boat...
Forum: Anchoring & Mooring 17-06-2020, 13:00
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Coming now backwards (never do!) to 3 ft swell.


Do you mean wind waves.


Or do you actually mean swell.


For 3ft wind waves to build over a 1 mile fetch, it takes 64 knots of wind.
Forum: Anchoring & Mooring 17-06-2020, 12:03
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

This may be a good idea. I wrote my own AIS app as well as a number of non sailing Apps, but here at CF there are people who wrote anchor alarm apps - I believe this popped up in threads some time...
Forum: Anchoring & Mooring 17-06-2020, 11:48
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Your son just wanted his dad off his back. we all did!


All that is required to build is free and is available online.


'To piggy-back on an existing app' I do not understand the meaning....
Forum: Anchoring & Mooring 17-06-2020, 11:32
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Building an Android app is bloody easy. The limitation is in finding the required time to build, test and debug.


Also, most people are afraid of side loading, so such an App would have very few...
Forum: Anchoring & Mooring 17-06-2020, 11:11
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

BTW If your formulas and algorithms are open source then it may be possible to build a neat Android App to input the boat and swell data and get outputs and visualize them.


b.
Forum: Anchoring & Mooring 17-06-2020, 11:08
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

Thank you, Mathias!


barnakiel
Forum: Anchoring & Mooring 17-06-2020, 08:21
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

face: 4.5 sq m,
side: 12 sq m,


weight 4t


I do not the D / Cd but the boat is not boxy, rather plenty of very oblique areas.
Forum: Anchoring & Mooring 17-06-2020, 08:11
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

However, this is exactly what I already have. I am trying to learn how the solutions provided by Mathias bear on the practical solutions I arrived at from experience and from Alain's work expressed...
Forum: Anchoring & Mooring 17-06-2020, 07:52
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

So, now.



PLS endure me, and if somebody can respond in a YES / NO (or close to this model) manner:


According to Math's math:
Forum: Anchoring & Mooring 17-06-2020, 07:43
Replies: 403
Views: 47,570
Posted By barnakiel
Re: Mathematic approach to anchoring scope

OK. I am with you. Thank you for setting this record straight.


Also when it comes to their blog, which I did not follow, thinking only about the context of their original books.


For the...
Showing results 1 to 25 of 37
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