Keelboat masts
28Pages

Aluminium masts Tradition and development From the very beginning in the 1960’s, Seldén produced a comprehensive range of aluminium yacht masts. Since then, the range has developed and expanded. The seven new keelboat sections feature a wealth of sophisticated and functional solutions, originating from the dinghy range and the yacht range. The sections are extruded and anodized and they are all available with a tapered top. When tapering the mast section, a wedge shaped piece of the section is cut out and the section is squeezed together and welded. This process does not affect the strength of the mast section as it takes place prior to the hardening process of the section. The taper is parabolic which means it has a fair curve over its entire length. A tapered top results in lower weight aloft, with less windage and improved response to gusts. A Mast ID number is engraved into the lower end of the mast section, for example D14-C126-0584. This mast is made from a C126 section. This is vital information when looking for maste parts in this catalogue. Aluminium mast sections Mast section

Photo: Billy Black. CW Hood 32.

Carbon masts The future is black and beautiful All Selden carbon masts use custom designed laminates to suit the particular application. The combination of meticulous care, long experience and exact specifications enable us to achieve optimum performance for minimum weight. The purpose is to make each individual boat go faster. The main characteristic of a carbon mast is the high longitudinal and lateral stiffness in relation to weight. The stiffness is customised to suit each individual boat and the crew can fine tune the prebend and the forestay tension to achieve a higher precision in...

Carbon boom sections

Head box, fractional rig The head box is manufactured from an extruded aluminium section and prepared for a variety of functions. An integrated groove in the top edge of the head box fitting helps in the installation of instrument brackets and backstay flicker, see page 16. To reduce the weight, the head box has four lightening holes. Head boxes for un-tapered sections, with back stay Mast section Main halyard Max. dia., mm (rope) 8 Back stay Max. dia., mm (wire) Clevis pin for back stay Dim., mm Head boxes for tapered sections, with back stay Mast section Long head box with block...

Long head box with block attachment for masthead spinnaker. Head box, no back stay Mast section Main halyard Max. dia., mm (rope) Photo: www.sail-box.ch. Mocean.

Accessories, fractional rig Mast section Aluminium Bracket for instrument and lights Art. no. Tricolour light, incl. screws, Art. no. Tricolour light + anchor light, incl. screws, Art. no. Bracket for Windex or VHF antenna * cannot be combined with backstay flicker Backstay flicker The bolt heads locate in the head box groove Lightening hole Stainless bracket distributes the load on the mast section The backstay flicker lifts the backstay to avoid damage to the leech of the sail when gybing and tacking. 508-303-01 Bracket for instruments and lights (Ø 65 mm). 508-334-01 Bracket for Windex...

Head box, masthead rig This head box fitting is also manufactured from an extruded aluminium section. It is mounted with a 15° angle and features two sheaves forward for jib/genoa halyards and two aft sheaves for main halyard and topping lift. Spin Block Loop, art. no. 508-175-01 Accessories, Masthead rig Mast section Mast section Forward sheaves, Loop for spinnaker halyard block Art. no. Halyard exit for spinnakerhalyard Art. no. Bracket for Windex or anchor light Art. no. Bracket for Tricolour light, incl. screws, Art. no. Instrument base Forestay toggles and back stay toggles Wire dia., mm

Forestay attachments and halyard routing, fractional rig Backing plate for T-terminal The most common type of forestay attachments is a T-terminal in the top end of the wire and a backing plate in the mast. The backing plate is located inside the mast so the rig load is properly distributed on the mast section. The middle part of the fitting protrudes through the section forming the female part in the forestay attachment. The forestay has full articulation, which ensures correct alignment and provides a secure and low fatigue attachment. All boxes are made of a glass fibre reinforced...

Backing plate Halyard box with wear guard for spinnaker halyard, plain bearing sheave. Art. no. Halyard box with wear guard for spinnaker halyard, ball bearing sheave. Art. no. Halyard box with wear guard Backing plate Halyard box for spinnaker halyard, plain bearing sheave. Art. no. Halyard box for spinnaker halyard, ball bearing sheave. Art. no. Single halyard lead Upper Halyard box for spinnaker halyard, plain bearing sheave. Art. no. Lower Halyard box for spinnaker halyard, plain bearing sheave. Art. no. Lower Halyard box for spinnaker halyard, ball bearing sheave. Art. no. Double...

Three functions in one fitting With a Triple combi box the sheaves for the spinnaker halyard and the jib halyard are combined with the forestay attachment. This fourth system is available for mast section C106 - C139. The exits for the halyards are well rounded to prevent wear. The sheave for the spinnaker halyard is of larger diameter than the sheave for the jib halyard. This separates the halyards inside the mast and makes for smooth low friction operation. Spinnaker halyard, max. dia., mm (rope) Jib halyard, recommended dia., mm (rope) Halyard lead for Furlex Art. no. Spinnaker halyard...

Halyard routing Halyard boxes Well thought out routing of halyards not only reduces friction, but will also prolong rope life. It makes for safe and fast sail setting and dousing, equally important for the cruising sailor as well as for the racing sailor. It’s all about quick and controlled sail handling. Seldén halyard boxes for halyards and spinnaker lift are designed to satisfy very high demands for functionality, strength and light weight. Halyard lead The single halyard lead guides the halyard vertical and into the halyard box. It prevents chafe on the halyard and on the halyard box....