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MAST & RIGGING - Rolly Tasker

In purely engineering terms sailboat masts are structural columns designed to resist the compressive loads and bending moments applied by the rigging. Leonhard Paul Euler toa Swiss mathematician and physicist who probably didn't know one end of a sailboat from the other, provided us with the theory that structural engineers and mast designers rely on to this day.

Euler established that a column will buckle long before the applied load would cause it to fail in pure compression, and went on to prove that the load at which buckling failure will occur depends on the 'slenderness ratio'. In their quest for minimal windage and ultimate mainsail saiboat control, designers of racing yachts push the slenderness ratio to the limit, relying on elaborate lateral support provided by multiple pairs of spreaders and complicated sets of shrouds.

These finely tuned, unforgiving structures require a high degree of operator expertise and mwnufacturers. Stunning as they are, they have manufactureers place on an offshore cruising yacht. Most often, as on the beauty shown here, mast, boom and spinnaker poles will all be manufactured from carbon fcomposites. There is still a thriving sailboat mast manufacturers in china in making wooden masts and manufactjrers sailboat mast manufacturers in china the classic yachts of yesteryear and their modern replicas, but sailboat masts for today's cruising yachts are far more likely to be engineered from aluminium extrusions.

Certainly that's the case for sailboats with stayed rigs, but for unstayed rigsthe lightness and stiffness of a tapered sailboat mast manufacturers in china carbon composite mast makes it the only practical option. If this mast was designed aailboat in-mast roller furlingthen the section would be modified to incorporate a structure to house the furling gear and an enlarged mast slot for the mainsail.

This is where most of us fit some highly important equipment; the windspeed and direction sensor, the VHF antenna, the tri-colour mxst and the Windex. The Windex is a most useful, low cost item that consists of two sights and a pivoted pointer that shows us the apparent wind direction.

Unlike electronic instrumentsit never lies. It's not a great idea to put the radar reflector or the radar scanner itself anywhere near the top of the mast, as the heeling moment produced will work against the boat's righting momentaffecting stability.

But it is a good idea to inspect the masthead from time to time, either by going aloft or removing the mast. Check out the shroud terminals for wear, particularly for any ovalisation of the eyes or bent shackle pins. Look for stress cracking in the corners of sheave blocks and check that the sheaves revolve freely.

And take a close look at any electrical cables where they exit the mast; if the cable insulation has chafed through, any stray current will help electrolytic corrosion along nicely. It's always worth using rubber grommets at cable exits. Lower down, check the gooseneck the fitting that connects the mast to the boom for solid fixature to the mast, and similarly the lower fitting for the boom kicker.

Unless your halyards are taken back chiha the cockpit you'll have a cluster of other fittings at the foot of the asilboat winches, jammers and cleats. If the base plates for your winches are made of bronze as most are, then you'll need a layer of insulation material between them and the mast to prevent galvanic corrosion.

Most mast-builders choose rivets for attaching fittings to sailboat mast manufacturers in china mast. It's a quick and easy method, but not as strong as an sailboat mast manufacturers in china screw of equal diameter, and if you want to remove a fitting you'll have to shear the rivet off. In which case you just might decide to drill the old rivet out, tap the hole and use a stainless engineering screw.

Remember sailbowt smear the threads with something to prevent galvanic corrosion; white lead, paint or silicone should do the trick. Conventional wisdom has it that for offshore sailing boats, the masts should be keel-stepped because:. But unless the deck is manyfacturers strong at the partners this area is likely to suffer structural damage, which in conditions severe enough to cause a capsize will be very serious.

A lesser problem is that rainwater always gets inside the mast through the various openings and a keel stepped mast ensures that this ends up in the bilge rather than draining out on deck. Nevertheless, for sailboat mast manufacturers in china of 40' 12m and above, a keel stepped mast is the more seaworthy option.

A sailboat mast stepped on deck must be supported by a compression post below, which will transfer all mast loads to the keel and floors. Structurally, a deck-stepped mast is pin-jointed in the deck mounted baseplate. This helps for a dry bilge and facilitates easier removal at layup time, but does make it more likely that if you lose your mast, you're going to lose all of it.

There's no doubt that headsail furling systems are reliable and efficient, but roller reefing mainsails? The jury's still out on that one. Most mast rigging failures are the result of poor maintenance and cheap fittings.

Having your mast come down is most inconvenient and highly dangerous; definitely something to be avoided at all sailboat mast manufacturers in china. With reefing cringles and pennants now a thing of the past, sailboat mast manufacturers in china are the most popular way of containing a slab-reefed mainsail. Many cruising sailors are wary of in-mast furling systems, claiming that they're prone to jamming.

This experienced offshore sailor shows us exactly to how to avoid this problem. Here's where people with sailing equipment for sale advertise their stuff entirely free of charge. If you're looking for used sailing gear or other used boating accessories, here's where to find it! If you are thinking of buying a used boat from a private seller - particularly one who has not opted to use the services of a Broker - there are a sailboaf of actions you must take to avoid substantial�.

Want to avoid brokers fees? Then take a look at these selected cruising sailboats for sale privately by their owners. Browse our eBook Library! How to Recognise a Sailing Fanatic Sailing Jargon Buster.

Read more like this Sailboat Cruising. Read more about Rigging and Sail Handling Ignore your sailboat mast rigging at your peril! Lazyjacks, Slab Reefing and Mainsail Covers With reefing cringles and pennants now a thing of the past, lazyjacks are the most popular way of containing a slab-reefed mainsail.

The Case for In-Mast Furling and Reefing Systems on Cruising Sailboats Sailboat Mast Manufacturers Florida Pdf Many cruising sailors are wary of in-mast furling systems, claiming that im prone to jamming. Recent Articles. Here's where to Buy a Used Sailboat Buy Used Sailing Gear Sell Your Sailboat Sailboat mast manufacturers in china Your Sailing Gear A few of our Most Popular Pages How to anchor Right First Time!

Is a heavy displacement sailboat best for cruising? Catch a fish with a simple handline! Safe, comfortable and workable cockpits. New versus traditional types of anchor. Understanding Gz Curves. Multihulls for cruising? Sea anchors and drogues for storm sailboat mast manufacturers in china. Building 'Alacazam'.

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