
- Andar per mare
-
by sara
RUBRICA SETTIMANALE “PAROLA DI SKIPPER” | I “CENTRI” DELLE BARCHE
La barca
7.1 I “centri” delle barche
Centro di gravità, centro di deriva, centro di carena, centro velico, centro di resistenza all’avanzamento, metacentro… Quanti centri in barca! A che serviranno poi? Premesso che la posizione di questi centri non è mai esattamente definita, anche perché è continuamente variabile, sia pure entro limiti contenuti, i “centri” servono, e come, soprattutto in fase di progettazione. Ma aiutano parecchio anche chi vuole avere le idee chiare sul comportamento della sua barca in mare, in modo da sapere come migliorarne le prestazioni. Non per niente gli sforzi del progettista e dello skipper sono tesi a creare una barca “centrata”, possibilmente in ogni condizione.
Che vuol dire “centrata” o “equilibrata”? Sono in tanti a parlarne o a scriverne, ma in pochi ad avere le idee davvero chiare. Talvolta infatti il centro velico (CV) viene messo con disinvoltura in relazione al centro di gravità (CG) o al centro di carena (CC) e la maggior parte di chi legge o ascolta non si accorge neppure dell’errore, piuttosto grave se commesso da un “addetto ai lavori”. E’ un fatto che questi centri vanno considerati sempre in coppia. Si deve però imbroccare la coppia giusta! Accade anche che lo stesso centro possa “accoppiarsi” con un altro per studiare una certa concatenazione di causa-effetto, e con un altro diverso per approfondire lo studio.
Come raccapezzarsi? Occorre innanzi tutto avere compreso bene le definizioni, che, in fin dei conti, non sono affatto difficili. Il CG, è baricentro, tutti sanno cos’è: il punto in cui si immagina applicata la forza peso di qualunque corpo, nel nostro caso della barca. Gli architetti sanno come scovarlo in sede di progetto, con un’accurata analisi dei pesi e della loro ubicazione. Va messo in relazione al CC per studiare la stabilità della barca dove si immagina applicata la “spinta di Archimede”, quella verticale, dal basso verso l’alto, uguale al peso dell’acqua spostata dalla carena, appunto, che poi è esattamente uguale al peso della barca, detto anche “dislocamento” proprio per questo motivo. Il CC della barca ferma e in assetto di progetto è localizzato nel centro di volume della carena, od opera viva, e viene individuato dagli architetti con un procedimento geometrico. CG e CC, in acqua calma e in assenza di vento o di altre forze che possono disturbare la barca ferma, sono dislocati sulla stessa verticale e, se la barca è stata ben progettata e non è stata appesantita poi in modo errato, la linea di galleggiamento di progetto coinciderà con quella reale.
E’ questa una prima verifica, da effettuare al momento del varo, ma anche in seguito, ogni tanto, perché inesorabilmente le barche vengono appesantite dagli armatori in maniera non sempre corretta. Ed è importante, perché, se l’assetto è quello giusto, la barca navigherà “sulle sue linee d’acqua”, opponendo la minima resistenza all’avanzamento. Se la barca risulta appoppata, o appruata, le sue prestazioni ne risentiranno negativamente.
Tratto dal libro Parola di Skipper, Editrice Incontri Nautici di Giancarlo Basilestabilità
zoritoler imol
I’ve read some good stuff here. Certainly worth bookmarking for revisiting. I surprise how much effort you put to make such a fantastic informative web site.
https://www.zoritolerimol.com
The Best Neighbourhoods to live in Busan (South Korea)
My brother recommended I might like this website. He was entirely right. This submit actually made my day. You cann’t believe simply how much time I had spent for this info! Thanks!
https://nftepubs.com/epub-profile.php?symbol=book-33353
copywriter Milano
When I originally commented I clicked the -Notify me when new comments are added- checkbox and now each time a comment is added I get four emails with the same comment. Is there any way you can remove me from that service? Thanks!
https://www.beatriceverga.it
How to Start a Catseye Reflector Business (Beginners Guide)
My brother recommended I might like this blog. He was entirely right. This post truly made my day. You cann’t imagine simply how much time I had spent for this info! Thanks!
https://nftepubs.com/epub-profile.php?symbol=9781505957464
Top Places to See in Manchester (United Kingdom)
I am constantly invstigating online for articles that can benefit me. Thanks!
https://nftepubs.com/epub-profile.php?symbol=book-67021
Nürnberg
What i don’t understood is in fact how you are no longer actually a lot more well-favored than you may be right now. You are so intelligent. You already know thus considerably relating to this matter, made me for my part believe it from a lot of numerous angles. Its like women and men aren’t interested until it’s one thing to do with Woman gaga! Your personal stuffs outstanding. At all times care for it up!
https://www.c-rown.it
An Adventurous Guide to Wild Swimming (Extreme Activity Guide Volume 1)
Great write-up, I?¦m normal visitor of one?¦s site, maintain up the excellent operate, and It is going to be a regular visitor for a long time.
https://nftepubs.com/epub-profile.php?symbol=book-14301
contabilità Online
Wow! Thank you! I always needed to write on my blog something like that. Can I take a fragment of your post to my site?
https://studiocontabileonline.net/
commercialista Online
Wonderful web site. Plenty of helpful info here. I am sending it to a few buddies ans also sharing in delicious. And obviously, thanks for your effort!
https://studiocontabileonline.net/
https://stone-islandestore.com/
Fantastic site. Lots of useful info here. I am sending it to several buddies ans additionally sharing in delicious. And of course, thanks in your sweat!
https://stone-islandestore.com/
The Best Romantic Restaurants in Krasnodar (Russia)
Hey just wanted to give you a brief heads up and let you know a few of the images aren’t loading properly. I’m not sure why but I think its a linking issue. I’ve tried it in two different browsers and both show the same results.
https://nftepubs.com/epub-profile.php?symbol=book-53120
The Best Places to Retire in Auckland (New Zealand)
Hi, Neat post. There is an issue together with your website in internet explorer, may check thisK IE still is the marketplace leader and a huge component of people will pass over your great writing because of this problem.
https://nftepubs.com/epub-profile.php?symbol=book-46967
www.webyoda.com
Definitely believe that which you said. Your favorite justification appeared to be on the internet the simplest thing to be aware of. I say to you, I definitely get irked while people consider worries that they plainly don’t know about. You managed to hit the nail upon the top and also defined out the whole thing without having side effect , people could take a signal. Will probably be back to get more. Thanks
https://webyoda.com/
La casa di carta: Corea Cineblog01
Wow! This could be one particular of the most helpful blogs We have ever arrive across on this subject. Actually Wonderful. I’m also a specialist in this topic so I can understand your effort.
https://altadefinizione.foundation/serie/la-casa-di-carta-corea/
monopattino elettrico
I?¦ve recently started a site, the information you offer on this web site has helped me tremendously. Thanks for all of your time & work.
https://www.isinwheel.it/
출장op
Good day! Would you mind if I share your blog with my facebook group? There’s a lot of people that I think would really enjoy your content. Please let me know. Many thanks
https://misskimanma.com/
hop over to here
We are a gaggle of volunteers and starting a new scheme in our community. Your web site offered us with helpful info to paintings on. You have performed an impressive task and our entire community will probably be thankful to you.
https://www.hambistro.it/italiana/
https://manuali-it.com/descrizione-del-design-e-delle-funzioni-della-inkjet-stampante-canon-pixma-ts7450a/
Real clean site, appreciate it for this post.
https://manuali-it.com/descrizione-del-design-e-delle-funzioni-della-inkjet-stampante-canon-pixma-ts7450a/
estrazioni crazy time
Undeniably believe that which you said. Your favorite justification seemed to be on the internet the simplest thing to be aware of. I say to you, I definitely get irked while people think about worries that they just don’t know about. You managed to hit the nail upon the top and also defined out the whole thing without having side-effects , people could take a signal. Will probably be back to get more. Thanks
https://city-app.it
Slot Pulsa
Good post. I study something more challenging on different blogs everyday. It’s going to all the time be stimulating to learn content from different writers and observe just a little something from their store. I’d prefer to use some with the content material on my weblog whether you don’t mind. Natually I’ll provide you with a hyperlink on your net blog. Thanks for sharing.
https://semanario.vanguardia.com.mx/slot-pulsa/
Scrittura Tesi
When I initially commented I clicked the -Notify me when new comments are added- checkbox and now every time a comment is added I get four emails with the identical comment. Is there any method you’ll be able to remove me from that service? Thanks!
https://scritturatesi.it/
dove giocare al crazy time
I believe this web site has got very good written subject material articles.
https://reteedicole.it
Macedonia del Nord
Nell’808 il sovrano bulgaro Krum avanzò verso Syar. Durante il regno di Khan Presian (836 – 852), a partire dall’837, la maggior parte dell’area rientrò nei confini del Primo Stato bulgaro fino al Mar Blu. Durante il regno del principe Boris-Michael (852-889) la Bulgaria si convertì al cristianesimo e la Scuola di Letteratura di Ohrid divenne il più importante centro culturale ed educativo, insieme alla capitale, del regno bulgaro.
https://mazedonische-geschichte.com/it/macedonia-del-nord/
Produzione Video Documentari in Italia
I have not checked in here for some time since I thought it was getting boring, but the last several posts are good quality so I guess I will add you back to my everyday bloglist. You deserve it my friend 🙂
https://orbispro.it
Art Director
I genuinely enjoy studying on this website , it holds great posts. “When a man’s willing and eager, the gods join in.” by Aeschylus.
https://portfolio.veccia-scavalli.net
erc20 batch transfer
An impressive share, I just given this onto a colleague who was doing a little analysis on this. And he in fact bought me breakfast because I found it for him.. smile. So let me reword that: Thnx for the treat! But yeah Thnkx for spending the time to discuss this, I feel strongly about it and love reading more on this topic. If possible, as you become expertise, would you mind updating your blog with more details? It is highly helpful for me. Big thumb up for this blog post!
https://faq.bulktokensender.com/faq/how-can-i-send-bsc-tokens-to-multiple-addresses
siti non aams rischi
Have you ever considered writing an ebook or guest authoring on other blogs? I have a blog centered on the same information you discuss and would love to have you share some stories/information. I know my subscribers would enjoy your work. If you’re even remotely interested, feel free to send me an email.
http://tsaeurope.com/log/hl/?casin__non_aams_con_un_deposito_minimo.html
foglio rosa patente b
Thanks for the good writeup. It in truth was once a enjoyment account it. Look complicated to more added agreeable from you! However, how can we keep up a correspondence?
https://acquistalapatentediguidasenzaesame.com/
come fare per dimagrire
Respect to article author, some fantastic entropy.
https://bruciaregrassi.site
bruciaregrassi
I discovered your blog website on google and verify a couple of of your early posts. Proceed to keep up the very good operate. I simply additional up your RSS feed to my MSN News Reader. Looking for forward to reading more from you afterward!…
https://bruciaregrassi.site
how to make wordpress website
I’m still learning from you, while I’m trying to achieve my goals. I absolutely love reading everything that is written on your blog.Keep the information coming. I enjoyed it!
https://webyoda.com/
3 mmc powder
I love the efforts you have put in this, thank you for all the great posts.
https://alphamedchem.com/de/product/kaufen-3-mmc-pulver/
folie für möbel
Sweet web site, super pattern, really clean and utilise genial.
https://www.decofilms.de/
Achtformpools
Hi my friend! I want to say that this article is amazing, great written and come with almost all significant infos. I would like to see more posts like this .
https://pool.net/achtformpool/
Pool
I simply couldn’t go away your site before suggesting that I extremely loved the usual info an individual provide for your visitors? Is going to be again steadily to inspect new posts
https://www.profi-poolwelt.de/
Rundbecken
Great post. I was checking continuously this blog and I am impressed! Very useful information specially the ultimate part 🙂 I take care of such information a lot. I used to be seeking this certain information for a long time. Thanks and good luck.
https://www.mister-pool.de/rundbecken/
Come riporre la biancheria in modo ordinato
whoah this blog is wonderful i really like studying your articles. Keep up the good paintings! You recognize, many individuals are hunting around for this information, you can help them greatly.
https://www.shopcentroscampoli.com/blog
Come pulire i tappeti
you have a great blog here! would you like to make some invite posts on my blog?
https://www.shopcentroscampoli.com/blog
Guida alla pulizia della casa
There is obviously a bunch to identify about this. I suppose you made some good points in features also.
https://www.shopcentroscampoli.com/blog
Come organizzare la pulizia della casa
Good – I should certainly pronounce, impressed with your website. I had no trouble navigating through all tabs and related information ended up being truly easy to do to access. I recently found what I hoped for before you know it in the least. Reasonably unusual. Is likely to appreciate it for those who add forums or anything, web site theme . a tones way for your customer to communicate. Excellent task..
https://www.shopcentroscampoli.com/blog
Come scegliere gli accappatoi
But wanna input on few general things, The website pattern is perfect, the content material is really fantastic. “Drop the question what tomorrow may bring, and count as profit every day that fate allows you.” by Horace.
https://www.shopcentroscampoli.com/blog
Come pulire i pavimenti
I don’t normally comment but I gotta admit thankyou for the post on this one : D.
https://www.shopcentroscampoli.com/blog
Come rimuovere le macchie difficili
I gotta bookmark this internet site it seems invaluable very beneficial
https://www.shopcentroscampoli.com/blog
Come pulire le superfici in legno
Hi! I know this is kinda off topic nevertheless I’d figured I’d ask. Would you be interested in trading links or maybe guest writing a blog article or vice-versa? My website addresses a lot of the same topics as yours and I think we could greatly benefit from each other. If you happen to be interested feel free to shoot me an email. I look forward to hearing from you! Fantastic blog by the way!
https://www.shopcentroscampoli.com/blog
Come evitare l’usura della biancheria
F*ckin’ tremendous things here. I am very happy to see your article. Thank you so much and i’m taking a look ahead to touch you. Will you please drop me a e-mail?
https://www.shopcentroscampoli.com/blog
Come pulire la lavastoviglie
I really like your writing style, superb info, thank you for posting :D. “The superfluous is very necessary.” by Francois Marie Arouet Voltaire.
https://www.shopcentroscampoli.com/blog
Come scegliere la biancheria in base allo stile di arredamento
Lovely just what I was searching for.Thanks to the author for taking his time on this one.
https://www.shopcentroscampoli.com/blog
Come scegliere la biancheria per la cucina
I wanted to thank you for this great read!! I definitely enjoying every little bit of it I have you bookmarked to check out new stuff you post…
https://www.shopcentroscampoli.com/blog
Biancheria per il cambio di stagione
Thank you for another great post. Where else could anybody get that type of information in such a perfect way of writing? I have a presentation next week, and I am on the look for such information.
https://www.shopcentroscampoli.com/blog
Come pulire la doccia
Can I just say what a relief to find someone who actually knows what theyre talking about on the internet. You definitely know how to bring an issue to light and make it important. More people need to read this and understand this side of the story. I cant believe youre not more popular because you definitely have the gift.
https://www.shopcentroscampoli.com/blog
Come conservare la biancheria
Good write-up, I¦m normal visitor of one¦s web site, maintain up the excellent operate, and It is going to be a regular visitor for a lengthy time.
https://www.shopcentroscampoli.com/blog
Come pulire i tappeti
Woh I like your posts, saved to fav! .
https://www.shopcentroscampoli.com/blog
Come pulire le persiane
Definitely, what a splendid site and illuminating posts, I definitely will bookmark your site.Have an awsome day!
https://www.shopcentroscampoli.com/blog
Come pulire le superfici in vetro
I went over this website and I think you have a lot of great information, saved to my bookmarks (:.
https://www.shopcentroscampoli.com/blog
Come eliminare i batteri in casa
Hi, Neat post. There’s a problem along with your website in internet explorer, could test this… IE still is the marketplace chief and a huge portion of other folks will omit your magnificent writing because of this problem.
https://www.shopcentroscampoli.com/blog
Come riporre la biancheria in modo ordinato
Merely a smiling visitant here to share the love (:, btw outstanding pattern.
https://www.shopcentroscampoli.com/blog
Come lavare la biancheria delicata
I’ve been exploring for a little for any high quality articles or blog posts on this sort of area . Exploring in Yahoo I at last stumbled upon this website. Reading this info So i’m happy to convey that I’ve an incredibly good uncanny feeling I discovered exactly what I needed. I most certainly will make sure to do not forget this website and give it a glance regularly.
https://www.shopcentroscampoli.com/blog
software magazzino
Hello, Neat post. There is a problem together with your website in web explorer, could check this?K IE still is the marketplace leader and a huge component of people will pass over your magnificent writing due to this problem.
https://gestionemagazzino.info/acquista-gestione-magazzino.html