Sleeved D+ Section - 1st World Championships 2004

The 2000 World Championship winning Seldén (formerly Proctor) D plus mast section continued to perform well in al levels of competition but has evolved to improve downwind performance.

D plus section was designed specifically for the Enterprise class, which, with its deck stepped rig and minimally tapered topmast, requires a very high sideways stiffness for offwind speed but combined with fore/ aft bend characteristics which enables power upwind to be controlled through fore and aft mast bend.

Testing in 2002 proved that a super stiff lower mast sleeve helps resist the sideways thrust force of the kicker providing a deeper and more powerful sail off wind. The new mast was thoroughly tested by the likes of Ian Pinnell & Jimmy Hunt and was used by Nick Craig to win his first Enterprise National Championships in 2003.

Nick commenting ’...the mast was an integral part in our winning packaging, giving us a speed edge over the fleet’.

Our 2628 boom section was designed around Enterprise class rules to give the unique strength-for-weight characteristics needed to give absolute mainsheet and kicker control, and boom slides are a unique design which allow direct attachment of mainsheet block saving every ounce at the end of the boat.

Results

1st National Championships 2003 & 2004
1st World 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	D Plus
Boom	2628

Mast Specification - D Plus

Standard masts are supplied with tenon heel plug, main halyard exit sheave, hook rack for wire main halyard, fully adjustable (length and angle) spreaders, and special topmast taper. Mast is fitted with drawlines for rapid attachment of rigging.

Boom Specification - 2628

Our standard boom includes inboard and outboard ends with ball bearing outhaul sheaves, plus two boom slides.

Spinnaker Pole Specification

Rigging Specification

Standard specification includes wire main and jib halyards, shrouds with swaged lower end.

Tuning Tips

	Crew in Boat	Hiking	Full Power	Overpowered	Very Overpowered
Wind Speed (knots)	5-8	9-11	12-15	16-20	20+
Mast Foot Position (from transom)	2689mm	2689mm	2689mm	2689mm	2689mm
Spreader deflection to aft side mast Spreader L = 413mm)	160mm	160mm	160mm	160mm	160mm
Mast rake	6490mm	6490mm	6490mm	6445mm	6445mm
Rig tension (lbs on shrouds)	400	400	450	450	450
Jib Car (from C/L)	595mm	595mm	595mm	595mm	595mm
Centreboard	vertical	vertical	vertical	5° up	10° up
Cunningham	loose	loose	loose	50%	100%
Outhaul	ease 25mm	ease 20mm	tight	tight	tight