Orientation of Through Bolts

When through bolting hardware, you might not pay much attention to which direction the bolt is facing. This may seem like a very mundane point to ponder, but this small detail can have a significant effect on the outcome of your project.

You may feel inclined to simply insert the bolt from which ever side you are standing on, but the truth is there is a right and wrong way to position a bolt.

To begin, lets look at a standard bolt. You have the head, smooth shank, and threaded portion. The head allows you to grasp the bolt with tools such as wrenches and sockets. The smooth shank is often overlooked, as it merely connects the head to the threads. The threaded portion is where the opposing nut attaches to give a bolt its fastening abilities.

The truth is, the smooth shank that is often ignored is actually the designed load bearing area of the bolt. This region of the bolt bears the most bulk and thus strength of the bolt. The threaded portion is actually significantly thinner as the threads are cut in, making the thickness of material reduced by the depth of the threads.

If you through bolt a high sheer stress object with the nut facing the most load, you risk sheering off the nut and causing a catastrophic failure to whatever you were trying to retain. The head should face the high strain working areas, as the head is right next to the smooth shank and thus is the strongest side of the bolt.

In the example below, a bracket was through bolted to the mast that will act as the attachment for all the turning blocks. Under full load, this bracket will be subjected to the full fury of the reef lines and main halyard. Since the halyard is located on one side of the bracket, that side will also be bequeathed with the heads of the bolts. The other side which will be under slightly less load will contain all of the acorn nuts used to hold the bolts in place.

Next time you go to through bolt a piece of equipment, be mindful of which end will be subjected to the most strain and place the heads of the bolts accordingly.

Synthetic Lifelines

Synthetic lifelines allow you to replace your questionable steel lifelines with dyneema that will provide you with a very lightweight lifeline that is immune to corrosion and easy to install yourself. The only specialty component that you need to make the conversion is a gate latch that can be spliced onto a synthetic lifeline. These latches cost around $70 each, and are readily attainable at most chandleries.

Synthetic lifelines are tensioned with lashings that attach to the pulpits. If you cut your lifelines a bit short, you don't need to worry since this will only require you to use a longer lashing.

The biggest issue with synthetic lifelines is chafe. You need to be mindful of sheets rubbing on them, as well as chafe from the stanchions that they pass through. The other issue is the spliced portion of the lifeline will not fit through the stanchion.

Chafe from the sheets can be managed by adjusting the sheet leads, but the chafe of the stanchion can not be avoided. The lifeline will rub on the stanchion because the lifeline passes through the stanchion. The trick is to polish the passage through the stanchion so that the chafe point is reduced.

As far as the splicing goes, there is a trick to work the splice around the stanchion. The splice is simply passed over the outside of the stanchion so that the bulk is bypassed. Be sure to leave enough room to scoot the spliced area over to inspect for chafe.

Lifting with your Rigging

Sailboats can be viewed as delicate creations that glide across pressure differentials in the air and water. Following this logic, you would be inclined to fear using your spars and rigging for anything other than sailing.

This is where davit companies take over, offering you an easy way to create a crane arm on your yacht that will lift your dinghy and outboard motor.

If you want to hang your dinghy on the stern and you don't have over-extending spars, then yes, you will need davits. If you are willing to place these heavy objects on the deck where they would be within the reach of the spars, then no, you won't need davits.

Davits are merely miniature replicas of what you already have, a mast and boom. The mast provides the vertical fixation point while the boom offers the horizontal fixation point. Using the two of these in tandem will allow you to easily lift and position any object you want onto your deck.

To do this, the first thing you need to do is stop viewing your rigging as a setup for sails and instead view it as a crane. The halyard is your hoist and your boom is simply the lateral positioning.

To carry this out, all you need to do is run a line from your mast out to the end of the boom and back. You will tie a bowline around the halyard in the end of this line after it has returned from the end of the boom.

This line is your outhaul and will position the object you are lifting along the boom.

To raise an object, you simply need to attach your halyard to it and begin cranking on your halyard winch. The outhaul will position it on the boom, so it is best to start with the outhaul all the way at the end of the boom, that way gravity will aid you in bringing it closer to the mast.

You can lift the object as high as the boom, and the boom can be lifted by way of the topping lift, giving you great flexibility in how you will manage your cargo. Once the object is clear of the lifelines by lifting it with the halyard, you can begin to ease the outhaul to bring it closer to the mast. When it is in the position that you desire, simply swing the boom over and it will bring the cargo with it.

Once it is over the area of interest, you can ease the halyard to lower it onto your deck.

Using this method, you can easily and safely remove and reinstall your inboard engine, as well as launch and retrieve your dinghy if you keep it under the boom behind the mast.

I keep a special line with a large thimble spliced into the end for the outhaul. The thimble reduces the friction and chafe between the outhaul and halyard, increasing their longevity. If this is a one time thing though, fire away with a bowline and get the job done!

Arthwartship Sheet Positioning

Most yachts are equipped to adjust the sheets in a fore aft direction via jib tracks. Some yachts have inhauls and barber hauls on their sheet blocks to allow for arthwartship positioning. Arthwartship is merely something that is in the beam dimension of the yacht. Inhauls and barber hauls simply move the block towards centerline or towards the sheer.

These adjustments may seem unnecessary, but in fact they are very important for headsail control on various points of sail. If your yacht is not setup to adjust these controls, it may be a good idea to figure out another way to still accomplish the end goal. 

When pointing to windward, the angle of attach of your sail is dictated by the location of your clew. If your clew is set far out on the cap rail, you will never be able to sheet the sail close hauled and sail close to the wind. Instead, you will be forced to sail at much wider angles and this will reduce your Velocity Made Good as you work to windward. 

By bringing your sheet block inboard, you also bring your yacht closer to the wind as your headsail can maintain the same angle of attach with your yacht pointing higher.  

When reaching, the opposite is true. If your sheet positions are far inboard, your sail will have to be eased considerably to reach. This will cause the leech to open up and twist horribly. You will have a sail presented to the wind, but all the wind will spill out the twist and provide very little drive. By moving the sheet block outboard, you can alleviate this problem by setting your block far forward (to control the leech) and outboard. Now you're able to pull in on the sheet, close the leech, and reach with power. 

On racing yachts, the sheet block is usually a ring suspended by four lines. One runs forward, one aft, one inboard, and one outboard. The fore and aft lines control the fore and aft position of the block, just like a car on a track. The inboard line is the inhaul which pulls the block inboard to allow better pointing to windward, while the outboard line is the barber haul, which pulls the block outboard for reaching. 

It is not always practical to convert your yacht with a perfectly functional jib track to this system, which is why snatch blocks may be your new best friend. If you have a perforated aluminum toe rail, you can easily clip the snatch block to the rail and lead the sheet from the sheet block into the snatch block. You have now effectively moved the sheeting position outboard and successfully created a barber haul for reaching and running. 

Adding a padeye inboard would allow you to place a snatch block further inboard, thus creating a close hauled sheeting point for beating. 

Life gets easier if you have a cutter, as your staysail will typically have a track that is further inboard than your jib. When beating close hauled, you will have to lower the staysail to reduce interference with the jib as you point higher. Since the staysail is not flying, you can also hook a snatch block onto the staysails jib track and give you a fully adjustable further inboard track to sheet your jib to. This will allow you to point your cutter like if it were a sloop, yet retain all the ocean going advantages of a cutter whine offshore. 

Sheet Leads

An often overlooked component of a headsail is the sheet lead position. While some people treat these blocks as static and permanently set attachment points, the truth is, they are meant to be moved around depending on what you are trying to achieve with your headsail.

Sheet leads are typically only able to move fore-aft, but some yachts are equipped to allow arthwartship adjustment as well. Fore-aft is by far the most common form of adjustment, where the sheet block is setup on a car mounted to a track. 

In the simplest of ways, moving the car forward is ideal in light air situation while moving the car aft is ideal in heavy air situations. The reason is, as you move the car forward, the force of the sheet is transferred up into the leech of the sail, allowing the foot to fill in. This creates a bigger chord in the sail and generates more power. When you move the sheet block aft, the force of the sheet gets transferred over to the foot of the sail. This will cause the foot to flatten and make the sail flatter. A flatter sail will generate less power and thus allow you to maintain control as the winds build. 

As you transfer the force of the sheet from foot to leech or leech to foot, the other side of the sail becomes ignored by the force. So when the car is forward, the leech is under control while the foot is ignored. When the car is aft, the foot is under control and the leech is ignored. This can serve some additional benefits as well. 

When winds build, you want to flatten the sail by tensioning the foot. Moving the car aft will accomplish this and it will also alleviate force on the leech. This will cause the sail to twist and the opening leech will spill excess air from the top of the sail. In high winds, this is ideal and will allow you to continue sailing along comfortably and safely. 

When you are reaching and have eased the sail, you may find that your sail is developing a twist, even though you don't want it to do so. Moving the car forward will allow you greater control of the leech and grant you the ability to close the twist in the sail, maximizing the power from the headsail. 

As of now, we understand that moving the car forward will control the leech and moving aft will control the foot, but where is the car to go to control both? The answer is somewhere in the middle. 

As you move the car forward and aft, the angle the sheet makes to the sail will change. With the car aft, the sheet will come into the sail at a very shallow angle. If you continue this line, it will meet the luff of the sail somewhere down near the tack. As you move the car forward, the sheet will meet the sail at a more extreme angle and the imaginary line will reach the luff further up towards the head of the sail. 

The neutral position where the force on the leech and foot are about equal is when the imaginary line that extends forward of the sheet meets the luff at about 40% the height of the luff (from tack to head). This point is considered to be the neutral position for your sheet block, and anything forward of this position is for lighter airs while anything aft is for heavy airs.