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The trawler yacht stems from its working cousins, the trawler fishing boat and the tugboat. Whether it is tradition or preference, often these yachts are equipped with Bitts and / or Bollards just like their relatives. Of course they have cleats as well, but the Bitts and Bollards are there to do the big jobs.
Now if you have a trawler yacht, you might want to know the correct way to belay a line to one of these babies. Well, first let's look at them because there are many styles. If your boat doesn't have all of them (and I have never seen one that does) then you should pay attention anyway because chances are the docks that you pull up to will sooner or later present the other styles, especially if you travel around the world as trawler folks like to do.
Bitts and Bollards are heavily built devices for belaying lines. Bitts may be classified as single, double, H-Bitt, Cruciform Bitt and others. Bollards may have a single post, double posts (either vertical or angled outward from center), Cruciform, staghorn, and many other styles. Sometimes Bitts are called Bollards and vice versa.
Lines rely on friction to keep them attached to Bitts, Bollards, Cleats, Lines, or other things. Friction increases with what is called normal force. Normal force is the perpendicular force between two objects. So, for example, when the load on a line increases (the boat drifts away from the dock and the line tension increases) the normal force between the line and the Bollard increases and the friction increases. If the total friction of the connection to the Bollard is greater than the force on the line to the boat, the connection holds.
Lines can be secured to Bitts and Bollards in such a way that they can be quickly released or made with a more permanent arrangement. The first such method has the problem that a boat tugging on a line can cause it to become undone or alternatively, if a line is positively tied off it can be hard to undo when required. The obvious difficulty with using a pre-tied loop of line is that its size has to be predetermined which may not be possible when the intended object for the bitter end is not in sight. A loop may not be a positively secure way of attaching to a Bollard. It may be used as a Lark's Head however with a double cruciform Bollard which would be a very secure attachment in my opinion and it can be released quickly if it does not have a load on it. If loaded it cannot be easily undone. Another way to more securely attach a loop to a single post Bollard is to place the loop over the Bollard and form another loop behind the Bollard by making a half twist in the loop and then bringing the resulting second loop back over the Bollard toward the front. A larger loop is required for this, but the result is more secure than just dropping a loop over the Bollard.
The bowline has been called the king of knots. Nothing can jam it. It will never slip if properly made. It can be tied in the hand forming a loop that may be dropped over a cleat, Bitt, or piling or formed around a mooring ring.
A Clove or ratline hitch is a convenient knot for making a line fast to a spar, the standing part of another line, a piling, or a Bollard. It is used to temporarily fasten a line, but it must be watched as it might undo if slack. When under a strain, however, it will not slip, but when under a hard strain, it will set up tight and may be difficult to break loose.
The usual methods of securing a line to a double Bitt is to make one turn on the first post and then wrap the line in a figure eight pattern over both posts of the Bitt. This arrangement may be removed quickly when necessary. Belaying the bitter end of the line coming off the Bitt on a cleat can further security. On a single post Bollard the usual way is to either tie several hitches to the Bollard or to slip an appropriate sized loop of line over the Bollard or as described earlier. Cross pieces on the Bollard can help keep the loop from slipping off the Bollard, but I prefer to ensure that the line will not accidentally come off.
Next is the Lighterman's Back Mooring Hitch which may be used on a single post Bollard, on a piling, or for heavy towing. Also known as the Tugboat hitch and the Backhanded Mooring Hitch, it is a well known and much trusted little number that, like the figure eight described earlier, can be undone even if there is a massive pull on it. It works well when you wish to moor to a Bollard - maybe whilst waiting for a lock or taking on water etc. and can be tied or untied in moments.
See pictures and details on belaying to Bitts And Bollards: Trawler Yachts [http://www.trawleryachts.net]
ASP.NET MVC Hosting :: 6 Tips for ASP.NET MVC Model Binding
Model binding in the ASP.NET MVC framework is simple. Your action methods need data, and the incoming HTTP request carries the data you need. The catch is that the data is embedded into POST-ed form values, and possibly the URL itself. Enter the DefaultModelBinder, which can magically convert form values and route data into objects. Model binders allow your controller code to remain cleanly separated from the dirtiness of interrogating the request and its associated environment.
Tip 1 : Prefer Binding Over Request.Form
If you are writing your actions like this ..
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Create()
{
Recipe recipe = new Recipe();
recipe.Name = Request.Form["Name"];
// ...
return View();
}
.. then you are doing it all wrong. The model binder can save you from using the Request and HttpContext properties – those properties make the action harder to read and harder to test. One step up would be to use a FormCollection parameter instead:
public ActionResult Create(FormCollection values)
{
Recipe recipe = new Recipe();
recipe.Name = values["Name"];
// ...
return View();
}
With the FormCollection you don't have to dig into the Request object, and sometimes you need this low level of control. But, if all of your data is in Request.Form, route data, or the URL query string, then you can let model binding work its magic:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Create(Recipe newRecipe)
{
// ...
return View();
}
In this example, the model binder will create your newRecipe object and populate it with data it finds in the request (by matching up data with the recipe's property names). It's pure auto-magic. There are many ways to customize the binding process with "white lists", "black lists", prefixes, and marker interfaces. For more control over when the binding takes place you can use the UpdateModel and TryUpdateModel methods.
Tip 2 : Custom model binders
Model binding is also one of the extensibility points in the MVC framework. If you can't use the default binding behavior you can provide your own model binders, and mix and match binders. To implement a custom model binder you need to implement the IModelBinder interface. There is only method involved - how hard can it be?
public interface IModelBinder
{
object BindModel(Controller Context controllerContext,
ModelBindingContext bindingContext);
}
Once you get neck deep into model binding, however, you'll discover that the simple IModelBinder interface doesn't fully describe all the implicit contracts and side-effects inside the framework. If you take a step back and look at the bigger picture you'll see that model binding is but one move in a carefully orchestrated dance between the model binder, the ModelState, and the HtmlHelpers. You can pick up on some of these implicit behaviors by reading the unit tests for the default model binder.
If the default model binder has problems putting data into your object, it will place the error messages and the erroneous data value into ModelState. You can check ModelState.IsValid to see if binding problems are present, and use ModelState.AddModelError to inject your own error messages.
Both the controller action and the view can look in ModelState to see if there was a binding problem. The controller would need to check ModelState for errors before saving stuff into the database, while the view can check ModelState for errors to give the user validation feedback. One important note is that the HtmlHelpers you use in a view will require ModelState to hold both a value (via ModelState.SetModelValue) and the error (via AddModelError) or you'll have runtime errors (null reference exceptions). The following code can demonstrate the problem:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Create(FormCollection Form0
{
// this is the wrong approach ...
if (Form["Name"].Trim().Length == 0)
ModelState.AddModelError("Name", "Name is required");
return view();
}
The above code creates a model error without ever setting a model value. It has other problems, too, but it will create exceptions if you render the following view.
<%= Html.TextBox("Name", Model.Name) %>
Even though you've specified Model.Name as the value for the textbox, the textbox helper will see the model error and attempt to display the "attempted value" that the user tried to put in the model. If you didn't set the model value in model state you'll see a null reference exception.
Tip 3 : Custom Mode Binding via Inheritance
If you've decided to implement a custom model binder, you might be able to cut down on the amount of work required by inheriting from DefaultModelBinder and adding some custom logic. In fact, this should be your default plan until you are certain you can't subclass the default binder to achieve the functionality you need. For example, suppose you just want to have some control over the creation of your model object. The DefaultModelBinder will create object's using Activator.CreateInstance and the model's default constructor. If you don't have a default constructor for your model, you can subclass the DefaultModelBinder and override the CreateModel method.
Tip 4 : Using Data Annotations for Validation
.NET 3.5 SP1 shipped a System.ComponentModel.DataAnnotations assembly that looks to play a central role as we move forward with the .NET framework. By using data annotations and the DataAnnotationsModelBinder, you can take care of most of your server-side validation by simply decorating your model with attributes.
public class Recipe
{
[Required(ErorrMessage="We need a name for this dish.")]
[Regular [removed]"^Bacon")]
public string Name { get; set; }
// ...
}
The DataAnnotationsModelBinder is also a great sample to read and understand how to effectively subclass the default model binder.
Tip 5 : Recognize Binding and Validation As Two Phases
Binding is about taking data from the environment and shoving it into the model, while validation is checking the model to make sure it meets our expectations. These are different different operations, but model binding tends to blur the distinction. If you want to perform validation and binding together in a model binder, you can – it's exactly what the DataAnnotationsModelBinder will do. However, one thing that is often overlooked is how the DefaultModelBinder itself separates the binding and validation phases. If all you need is simple property validation, then all you need to do is override the OnPropertyValidating method of the DefaultModelBinder.
Tip 6 : Binders Are About The Environment
Earlier we said that "model binders allow your controller code to remain cleanly separated from the dirtiness of interrogating the request and its associated environment". Generally, when we think of binder we think of moving data from the routing data and posted form values into the model. However, there is no restriction of where you find data for your model. The context of a web request is rich with information about the client.
Conclusion
Model binding is beautiful magic, so take advantage of the built-in magic when you can. We think the topic of model binding could use it's own dedicated web site. It would be a very boring web site with lots of boring code, but model binding has many subtleties. For instance, we never even got to the topic of culture in this post.
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The followings are the top 10 reasons you should trust your online business and hosting needs to us:
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Can i post articles from magazines and news sites on my site so long as i give the proper credit to the writer
Good day all, I want to set up a website and was wondering if it is possible to post articles that i have collected over the years from Time magazine, BBC.com and some collected from various web sites over the net. When I do this, is it true that all I have to do is to state the name of the writer at the bottom of the article? If it is not true, please advise on the necessary steps that I should take. Your time and thoughts are greatly appreciated, thank you
Should be able to. Just don't try to profit from them in any way. That's a major no-no.
1. Make sure you put all copied work in quotes (" "). This way, you show it's not your own.
2. I'd provide the URL link to the original work. It's kind of like citing your sources.
Best of luck to your site.
Wimbledon: Rafael Nadal and Andy Murray seek to define the post-Federer era
The Nadal-Murray semifinal probably will be the match of the tournament.
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