{"title":"BUP - 470 Mast, Boom, Spinnaker Pole and Deck Hardware","description":"\u003cp\u003eThe 470 is one of the most technically demanding Olympic classes. Success is not only about sail trim and tactics. It is about understanding how mast section, taper profile, rig tension and geometry interact across wind ranges. Seldén has developed a complete 470 spar range in collaboration with top teams, offering distinct mast stiffness platforms and advanced customisation options. The objective is simple. Deliver repeatable bend characteristics, defined gust response and a tuning window wide enough for Olympic campaigns.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eMast Platforms\u003c\/h2\u003e\n\u003cp\u003eSeldén offers three stiffness platforms for the 470 class, each designed around crew weight and performance objectives.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eCumulus Standard – Reference Platform\u003c\/h3\u003e\n\u003cp\u003eCumulus is the most widely used Seldén 470 mast section. It offers a balanced stiffness profile and controlled gust response, making it the reference platform for most teams.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eParabolic taper profile.\u003c\/li\u003e\n\u003cli\u003eExcellent balance between stiffness, weight and dynamic response.\u003c\/li\u003e\n\u003cli\u003eChampionship-proven geometry.\u003c\/li\u003e\n\u003cli\u003ePredictable fore-aft and athwartship behaviour.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor teams seeking a stable, well-understood tuning base, Cumulus Standard remains the default section of choice.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eCumulus Needle Taper – Extended Depowering Range\u003c\/h3\u003e\n\u003cp\u003eThe Cumulus Needle Taper introduces a smaller, more flexible top section above the hounds. The result is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGreater depowering range without losing lower-panel control.\u003c\/li\u003e\n\u003cli\u003eIncreased top-mast “whip” in gusts.\u003c\/li\u003e\n\u003cli\u003eMore dynamic bend profile in unstable wind conditions.\u003c\/li\u003e\n\u003cli\u003eA wider tuning window across regatta wind ranges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Needle Taper is the evolution of the Cumulus platform. It is designed for teams seeking additional responsiveness while retaining the lower-section stability required for high-load upwind modes.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eZeta – For Lighter Crews\u003c\/h3\u003e\n\u003cp\u003eZeta is the lightest and most flexible section in the Seldén 470 range.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eApproximately 10% softer than Cumulus \u003c\/li\u003e\n\u003cli\u003eEarlier gust response.\u003c\/li\u003e\n\u003cli\u003eInternal sleeving for deck-level control.\u003c\/li\u003e\n\u003cli\u003eDeveloped specifically for lighter teams.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eZeta allows lighter combined crew weights to access earlier bend and improved control without excessive pre-bend settings.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eAlto – Increased Stiffness for Power Conditions\u003c\/h3\u003e\n\u003cp\u003eAlto is approximately 5% stiffer than Cumulus and was originally developed for marginal power conditions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreased fore-aft stiffness.\u003c\/li\u003e\n\u003cli\u003eFavoured by heavier crews seeking extra light-wind power.\u003c\/li\u003e\n\u003cli\u003eStrong lower-panel support.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlto occupies a narrower use case within the modern fleet but remains a defined option for specific weight and venue profiles.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eEngineering and Manufacturing Precision\u003c\/h3\u003e\n\u003cp\u003eAll Seldén 470 tapers are CNC plasma cut and auto welded for consistency. Parabolic taper geometry provides relative stiffness at high-load lower sections and controlled flexibility toward the tip. All spars are heat treated in-house to increase hardness and resistance to permanent set. CNC drilling ensures T-terminal alignment accuracy to 0.1mm side to side for straight rig geometry  For two-boat tuning and race\/spare mast replication, this level of repeatability matters.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eCustomisation as a Campaign Tool\u003c\/h2\u003e\n\u003cp\u003eOlympic campaigns rarely operate with fixed geometry. Seldén supports advanced configuration including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNeedle taper integration.\u003c\/li\u003e\n\u003cli\u003eExtended goosenecks.\u003c\/li\u003e\n\u003cli\u003eOptional halyard locks.\u003c\/li\u003e\n\u003cli\u003eAlternative tube weights.\u003c\/li\u003e\n\u003cli\u003eCustom fitting positions.\u003c\/li\u003e\n\u003cli\u003eFully adjustable spreader systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis allows teams to refine bend behaviour, rake geometry and load distribution according to crew weight, sail design and target regatta conditions. The mast is not a static component. It is a tuning platform.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eBooms\u003c\/h2\u003e\n\u003ch3\u003eUltima Boom\u003c\/h3\u003e\n\u003cp\u003eThe Ultima section is optimised for maximum vertical stiffness within 470 class rules.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e“Plank” profile with material concentrated top and bottom.\u003c\/li\u003e\n\u003cli\u003eReduced side wall thickness for weight efficiency.\u003c\/li\u003e\n\u003cli\u003eLower track eliminated to reduce weight and increase structural efficiency.\u003c\/li\u003e\n\u003cli\u003eFixed kicker and mainsheet geometry.\u003c\/li\u003e\n\u003cli\u003eExtruded from Seldén XPS alloy for increased tensile strength.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUltima is currently the most performance-oriented boom in the Seldén 470 range.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eOlympus Boom\u003c\/h3\u003e\n\u003cp\u003eOlympus offers a slightly softer and lighter alternative while remaining competition specification.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMaximum width and depth within class rules.\u003c\/li\u003e\n\u003cli\u003eHigh-load kicker slide.\u003c\/li\u003e\n\u003cli\u003eSliding mainsheet system.\u003c\/li\u003e\n\u003cli\u003eIntegrated 4:1 outhaul\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003ch2\u003e42mm Tapered Spinnaker Poles\u003c\/h2\u003e\n\u003cp\u003eSeldén 470 poles use seamless double taper construction with 6082-T6 aluminium tubes for the lightest and stiffness poles available.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCentral lift eye configuration options.\u003c\/li\u003e\n\u003cli\u003eBeak up or beak down variants.\u003c\/li\u003e\n\u003cli\u003eSeldén pole ends engineered for reliability under high dynamic loads.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe objective is minimal deflection under load and clean spinnaker projection downwind.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eIntegrated Performance Ecosystem\u003c\/h2\u003e\n\u003cp\u003eWhile mast selection remains the primary performance driver, Olympic campaigns also require:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRig packs with repeatable geometry.\u003c\/li\u003e\n\u003cli\u003eHigh-load vang systems.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrecision deck hardware.\u003c\/li\u003e\n\u003cli\u003eGlobal spare availability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSeldén supplies a complete ecosystem for the 470 class, allowing teams to standardise spars, hardware and rig components across training bases and regattas worldwide. \u003c\/p\u003e","products":[{"product_id":"470-complete-boom-olympus-section","title":"470 Complete Boom, Olympus Section","description":"\u003cp\u003eCompetition specification fully fitted. Olympus was designed for maxiumum width and depth within the 470 class rules. It is super stiff and light as well as being extruded from Seldén XPS aluminum. This unique material alloyed specifically for Seldén provides higher tensile strength than other grades. Includes high load kicker slide, mainsheet slides with 40mm ball bearing blocks and an outhaul system.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004030677330,"sku":"B072-0474D","price":349.56,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_e28262fe-2c4d-4116-b5b7-57d6bcc0dc7c.png?v=1763543770"},{"product_id":"470-complete-boom-ultima-section","title":"470 Complete Boom, Ultima Section","description":"\u003cp\u003eThe ultimate 470 boom, competition specification and fully fitted. Ultima is now the most popular boom in the class. Optimsed for verticle stiffness the ')plank') profile is stiffness and weight efficient. Weight is further reduced by eliminating the underside track meaning the kicker and mainsheet attachments are in fixed positions. The outboard end has a class maximum ')slash') and the outboard end fitting has been replaced by an integrated sheave. Includes kicker soft attachment, fixed 40mm ball bearing blocks and outhaul system. Ultima is extruded from Seldén XPS aluminum. This unique material alloyed specifically for Seldén provides higher tensile strength than other grades.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004034019666,"sku":"B073-0474","price":510.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_0ccd1956-a564-4fa1-8554-fe6d3d35b2e1.png?v=1763543771"},{"product_id":"470-complete-mast-zeta-section","title":"470 Complete Mast, Zeta Section","description":"\u003cp\u003eIdeal for lighter crews, Zeta is our most flexible and lightest 470 spar. Supplied complete and ready to race with fully adjustable spreaders, just add a rigging pack if required.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004046963026,"sku":"D14-C068-0531","price":1267.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_c7d22fa8-3e6a-4403-81f8-f382de80b27a.png?v=1763544959"},{"product_id":"470-complete-mast-cumulus-section-standard-taper","title":"470 Complete Mast, Cumulus Section, Standard Taper","description":"\u003cp\u003eCumulus is our most popular mast section and in 470, has won many medals and championships. The standard parabolic taper provides more stiffness at the hounds and overall, a slightly stiffer top mast than other manufacturers. Supplied complete and ready to win off-the-shelf, or contact Seldén to customise with extended goosenecks, halyard locks, alternative tube weights and fittings positions. Add a rigging pack if required.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004047257938,"sku":"D14-C069-0531","price":1267.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_d0c274d3-9882-4276-9520-d13264b3d94f.png?v=1763023760"},{"product_id":"470-complete-mast-cumulus-section-needle-taper","title":"470 Complete Mast, Cumulus Section, Needle Taper","description":"\u003cp\u003eThe needle taper offers the smallest and most flexible top mast available providing more gust response and ')whip') above the hounds compared to other manufacturers. Cumulus is our most popular mast section and in 470 has already won many medals and championships. With the needle taper performance is further optimised through a more dynamic bend profile. Supplied complete and ready to win off-the-shelf, or contact Seldén to customise with extended goosenecks, halyard locks, alternative tube weights and fittings positions. Add a rigging pack if required.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004047847762,"sku":"D14-C069-2028-02","price":1267.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_c14e6fa0-53a2-4194-8b1c-b15d9711bbf1.png?v=1763544959"},{"product_id":"470-complete-mast-alto-section","title":"470 Complete Mast, Alto Section","description":"\u003cp\u003eIdeal for heavier crews, Alto is the stiffest section we offer for 420. Supplied complete and ready to win off-the-shelf, or contact Seldén to customise with needle tapers, extended goosenecks, halyard locks, alternative tube weights and fittings positions. Add a rigging pack if required. Supplied complete and ready to race with fully adjustable spreaders, just add a rigging pack if required.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004048077138,"sku":"D14-C071-0531","price":1267.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_d74ad3e4-70d3-4c49-ac3c-d63f8fe26609.png?v=1763023763"},{"product_id":"470-complete-rigging-pack","title":"470 Complete Rigging Pack","description":"Competition specification rigging pack fits all Seldén 470 masts. Compact wire shrouds with adjusters, forestay and jib halyard. Dyneema SK78 main halyard and pole lift. Trapeze ')T') Terminal rings are supplied to allow crews to splice on their own choice of lines and adjusters.\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004049650002,"sku":"RIGP-0474","price":536.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_d52f4af2-a689-4ab0-b565-c82411ed7f8e.jpg?v=1770622864"},{"product_id":"470-42mm-tapered-spinnaker-pole-no-eye","title":"470 42mm Tapered Spinnaker Pole, No Eye","description":"\u003cp\u003eThe stiffest and lightest 42mm 470 pole available, seamless double tapered with Seldén pole ends, renowned as the best available. The tube is super thin walled to reduce weight while the parallel section is as long as possible to increase stiffness. Supplied without a pole lift eye so crews can use the fitting of their choice.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004052402514,"sku":"S042-0474","price":130.97,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_1eb1ba3e-5d1a-4d35-8b69-7a4a3fd8f0cd.jpg?v=1779710171"},{"product_id":"470-42mm-complete-tapered-spinnaker-pole","title":"470 42mm Complete Tapered Spinnaker Pole","description":"\u003cp\u003eThe stiffest and lightest 42mm 470 pole available, seamless double tapered with a central lift eye. The tube is super thin walled to reduce weight while the parallel section is as long as possible to increase stiffness. Seldén pole ends are renowned as the best available, fitted with the beak facing up.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52004052435282,"sku":"S042-0474E","price":141.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_15fd5266-fe09-4504-b6dc-29c8cd37e08f.jpg?v=1780905657"},{"product_id":"470-42mm-complete-tapered-spinnaker-pole-beak-down","title":"470 42mm Complete Tapered Spinnaker Pole, Beak Down","description":"\u003cp\u003eThe stiffest and lightest 42mm 470 pole available, seamless double tapered with a central lift eye. The tube is super thin walled to reduce weight while the parallel section is as long as possible to increase stiffness. 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Supplied complete with rivets.\u003c\/p\u003e\u003cp\u003eNote: You may need to move your black band inboard to remain within your class rules.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Selden Dinghy Store","offers":[{"title":"Default Title","offer_id":52143103541586,"sku":"508-808-01","price":129.37,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/1325\/4738\/files\/index_25b51b66-f2a1-44bc-b5e2-af0b2849edcf.jpg?v=1770626466"},{"product_id":"rig-tension-car","title":"Rig Tension Car","description":"\u003cp\u003eThe Rig Tension Car replaces the usual block and hook found on many dinghy jib halyard tension systems, incorporating the halyard hook with a 25mm high load stainless ball-bearing sheave. The car is conveniently retained on the back of the mast instead of being lost in the bottom of the boat. It is engaged in the track at the jib halyard exit slot below the gooseneck. Friction is much reduced making it easier to pull on the rig tension. The car has a nylon slide pad than runs smoothly on the spar surface unlike the hook and block that gradually wears away the tubes protective coating. The car incorporates a becket so the first part of the tension system can be rigged as a 2:1 or 3:1.\u003c\/p\u003e\u003cp\u003eThe Rig Tension Car fits all Seldén aluminium dinghy sections except 2420. 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