Update - New Section for Big Kite

Since the inclusion of the new big spinnaker, there is a world-wide change to the Seldén Cumulus section. With similar fore and aft bend to the notoriously fast ‘D’ section, existing proven mainsails are immediately fast.

The increased sideways stiffness gives the rig the support it requires offwind. Well proven since 1999 by Krister Bergstrom, the then two piece Cumulus has already won one World Championship (Durban 2000).

Since then, the tube is now available long enough to suit the 505, and has dominated most major 505 regattas worldwide, being used by the likes of Howie Hamlin, Ian Pinnell, Sandy Higgins, Krister Bergstrom etc..

Morgan Larson used a radical twin spreader option to win the 2004 World Championships on his Cumulus section.

In 2005 Seldén are working with BM Sails to develop a ’stiff’ rig option in the Epsilon section, ideal for heavy weights & Baltic (flat water) regattas, being fully optimised for the BM sail.

Results

1st - 5th World Championships 2004

1st National Championships 2004

1st French & Australian National Championships 2004

Why Seldén?

Choose a Seldén mast and you will find many performance enhancing features unique to our products, for example:

• The Seldén tapering system ensures that our tapers are minimum size and weight. This gives low windage, centre of gravity and topmast weight. This maximises your speed by enabling the topmast to react quickly to gusts and waves giving better acceleration, a smoother ride upwind and, ultimately, more races won!
• Automated welding keeps excess heat out of the taper for guaranteed consistency and performance. The weld produced is so perfect that there is no need to mechanically grind the weld (which can induce inconsistencies). This means that once we have finalised a winning design, you can be sure that your spar will perform identically to the champions.
• All masts are heat treated in our purpose-designed oven. This artificial hardening ensures that you get maximum performance from the high performance aluminium alloy.
• Our spars pass through a purpose-developed bead-peening machine. This gives the mast a perfect satin finish that dramatically improves fatigue properties, giving you a mast that will perform reliably for many years.
• Top quality fittings such as our fully adjustable spreader bracket and highly durable cast gooseneck ensure speed and reliability on the racecourse.

Sections Available

Mast	Cumulus , Epsilon
Boom	2633

Mast Specification - Cumulus , Epsilon

Mast is supplied overlength (7500mm) with fittings below deck supplied loose, including main hook rack. Mast is fitted with small deck level sleeve to reduce compression failures and at spreaders to prevent halyards snagging. Spec includes ball bearing spinnaker sheave, and fully adjustable ’thumbscrew’ spreader bracket.

Our stock mast has been optimised by Ian Pinell and is now supplied with ’high’ T wire positions and lower ’tweaker’ slots.

There are many fit out options, please contact ih@seldenmast.co.uk for details.

Boom Specification - 2633

2633 section has an unrivalled stiffness to weight ratio, allowing maximum performance through vang and mainsheet control, together with minimum excess weight.

Outboard end of boom is cutaway as standard, and boom is supplied with inboard and outboard ends with sheaves, plus three boom slides. which allow direct attachment of kicker and mainsheet blocks for easy centrelining in medium conditions.

Spinnaker Pole Specification

Standard spinnaker pole is stiff, lightweight 42mm tapered section for end slung pole systems.

Rigging Specification

Wire main and jib halyards and kevlar pole uphaul. Draw lines are fitted in the mast for rapid attachment of halyards.

Tuning Tips

	Crew in Boat	Semi-trapezing	Full trapezing	Overpowered	Very Overpowered
Wind Speed (knots)	5-8	9-11	12-15	16-20	20+
Mast Foot Position (from back of transom)	3045mm	3045mm	3045mm	3045mm	3045mm
Spreader deflection to aft side mast Spreader L = 400mm)	110mm	110mm	110mm	110mm	110mm
Mast rake	7740mm	7740mm	7695mm	7695mm	7565mm
Rig tension (Loos, on shroud)	470lbs	300lbs	300lbs	260lbs	260lbs
Pre bend, natural (no chocks)	60mm	50mm	50mm	50mm	50mm
Centreboard	5 degrees fwd	vertical	5 ° up	10 ° up	15 ° up