Selden CX and GX Selection Guide (PDF)

SELECTION GUIDE

Size a Selden CX Code 0 furler or GX top-down gennaker furler by sail area and righting moment, then pick the AT-cable, furling line, 2:1 halyard parts, thimbles, clamps, adapters and shackles that go with it.

DocumentSelden CX and GX Selection Guide

FormatPDF · 12 pages · 2.4 MB

LanguageEnglish

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The Sails The Furlers CX for Code 0 GX Top-Down CX + Adapter AT-Cable & Line Code 0 Halyard Thimbles & Adapters Accessories Products

Code 0 → CX

Straight luff set under tension; mid girth <75% of foot length.
An AT-cable is integrated in the luff with thimbles at head and tack; the whole luff furls at once.
Hoisted as high as the mast allows and tacked to the bow or a sturdy bowsprit. Flat design, best at apparent wind angles between 40° and 90°.

Asymmetric spinnaker → GX

Mid girth >75% of foot length; luff at least 2% longer than the leech.
Top-down furling: an AT-cable joins drum and halyard swivel and carries the drum rotation to the head, so the sail furls from the top down.
Fitted to the bow or preferably a retractable Selden bowsprit; moderate halyard tension, hoisted on the spinnaker halyard. Generally for apparent wind angles between 90° and 120°.
Before furling, take the power out of the sail by releasing the sheet and, if possible, bearing away.

How CX and GX Work

Both run an endless furling line over a line-driver drum, led back to the cockpit through double fairleads and locked in a twin-cam block. To douse: ease the sheet, pull the continuous line and secure it in the twin-cam block; the furled sail can then be dropped and bagged or left hoisted.

Metal "teeth" in the drum grip the line when furling.
A wedge in the line guide separates the line from the drum when unfurling, so the drum spins freely.
Sealed steel bearings in the drum and halyard swivel.
Rubber fender stops the halyard swivel chafing the mast while hoisting the furled sail.
CX: spring-loaded lock to connect the thimbles to drum and halyard swivel.
GX: patented line lock to mount the AT-cable to drum and halyard swivel.
All structural parts in high-strength Duplex stainless steel.
Non-structural parts in glass fibre reinforced polyamide composite.
GX systems come standard with the AT-cable.
Tack ring with Torlon® ball bearings.

Selden CX for Code 0

Special cable clamps are required to fit the thimbles to the Selden AT-cable. A dedicated Code 0 halyard is required, and a 2:1 purchase is recommended. Drum and furling line can be permanently mounted to the bow and along the stanchions.

Kit (drum + halyard swivel) Art. No.	Model	Drum Ø (mm)	Safe working load (kN)	Max suggested sail area (m²)	Max RM at 30° heel (kNm)	Approx. displacement (t)
545-010-10	CX10	105	10	50	25	5	View kit →
545-100-10	CX15	120	15	80	45	7.7	View kit →
545-200-10	CX25	150	25	115	90	14	View kit →
545-433-10	CX45	190	45	200	200	28	View kit →

Selden GX for Top-Down Furling

The kit includes GX drum, halyard swivel and AT-cable; drum and swivel are permanently fitted to the sail with the Selden line lock. Connect the drum to the bow and the spinnaker halyard to the swivel, lead the furling line aft through double fairleads, tension it and lock it in the twin-cam block, then hoist the furled sail.

Kit Art. No.	Model	Max system length (mm)	Drum Ø (mm)	AT-cable Ø (mm)	Max suggested sail area (m²)	Max working load (kN)
545-018-24	GX7.5	10000	105	9	50	7.5	View kit →
545-018-21	GX7.5	13000	105	9	50	7.5	View kit →
545-018-22	GX7.5	16000	105	9	50	7.5	View kit →
545-018-23	GX7.5	19000	105	9	50	7.5	View kit →
545-118-21	GX10	13000	120	11	80	10	View kit →
545-118-22	GX10	16000	120	11	80	10	View kit →
545-118-23	GX10	19000	120	11	80	10	View kit →
545-118-24	GX10	22000	120	11	80	10	View kit →
545-218-21	GX15	16000	150	13	115	15	View kit →
545-218-22	GX15	19000	150	13	115	15	View kit →
545-218-23	GX15	22000	150	13	115	15	View kit →
545-218-24	GX15	25000	150	13	115	15	View kit →
545-218-25	GX15	28000	150	13	115	15	View kit →
545-418-21	GX25	19000	190	15	200	25	View kit →
545-418-22	GX25	22000	190	15	200	25	View kit →
545-418-23	GX25	25000	190	15	200	25	View kit →
545-418-24	GX25	28000	190	15	200	25	View kit →

CX Drum for Top-Down Furling

CX drum + Free Tack Adapter & GX halyard swivel (gennaker only)

The furled sail with the adapter connects to the CX drum and is hoisted on the spinnaker halyard.

Model	CX drum Art. No.		Free Tack Adapter & GX halyard swivel kit Art. No.		AT-cable Ø (mm)	Equals	Max suggested sail area (m²)
CX10	545-010-11	View drum →	545-028-10	View kit →	9	GX7.5	50
CX15	545-100-11	View drum →	545-128-10	Ask us to source it →	11	GX10	80
CX25	545-200-11	View drum →	545-228-10	Ask us to source it →	13	GX15	115
CX45	545-433-11	View drum →	545-428-10	View kit →	15	GX25	200

CX for Code 0 and gennaker on one halyard

All-in-one: the CX drum and thimble halyard swivel serve both the Code 0 and a gennaker. The Free Tack Adapter is fitted permanently to the gennaker tack with the line lock; connect whichever sail suits the conditions and hoist on the Code 0 halyard.

Model	CX drum & halyard swivel Art. No.		Adapter Art. No.		AT-cable Ø (mm)	Equals	Max suggested gennaker area (m²)
CX10	545-010-10	View kit →	545-028-11	View adapter →	9	GX7.5	50
CX15	545-100-10	View kit →	545-128-11	View adapter →	11	GX10	80
CX25	545-200-10	View kit →	545-228-11	View adapter →	13	GX15	115
CX45	545-433-10	View kit →	545-428-11	View adapter →	15	GX25	200

AT-Cables and Endless Furling Line

The more torsionally rigid the AT-cable, the quicker and safer the sail furls; the Selden cable is included in the GX kit.

Art. No.	Length (mm)	Ø (mm)	To be used for
613-020-01	13000	9	CX10, GX7,5, CX10 + GX7,5 adapter	View cable →
613-020-02	16000	9	CX10, GX7,5, CX10 + GX7,5 adapter	View cable →
613-020-03	19000	9	CX10, GX7,5, CX10 + GX7,5 adapter	View cable →
613-021-01	13000	11	GX10, CX15, CX15 + GX10 adapter	View cable →
613-021-02	16000	11	GX10, CX15, CX15 + GX10 adapter	View cable →
613-021-03	19000	11	GX10, CX15, CX15 + GX10 adapter	View cable →
613-021-04	22000	11	GX10, CX15, CX15 + GX10 adapter	View cable →
613-022-01	16000	13	GX15, CX25, CX25 + GX15 adapter	View cable →
613-022-02	19000	13	GX15, CX25, CX25 + GX15 adapter	View cable →
613-022-03	22000	13	GX15, CX25, CX25 + GX15 adapter	View cable →
613-022-04	25000	13	GX15, CX25, CX25 + GX15 adapter	View cable →
613-022-05	28000	13	GX15, CX25, CX25 + GX15 adapter	View cable →
613-023-01	19000	15	CX45, GX25, CX45 + GX25 adapter	View cable →
613-023-02	22000	15	CX45, GX25, CX45 + GX25 adapter	View cable →
613-023-03	25000	15	CX45, GX25, CX45 + GX25 adapter	View cable →
613-023-04	28000	15	CX45, GX25, CX45 + GX25 adapter	View cable →

Endless furling line

Line only, Art. No.		With twin-cam block installed, Art. No.		Length (mm)	Ø (mm)	To be used for
611-007-06	View line →	611-007-31	View kit →	2 × 4000	8	CX10, CX15, GX7,5, GX10
611-007-07	View line →	611-007-32	View kit →	2 × 8000	8	CX10, CX15, GX7,5, GX10
611-007-09	View line →	611-007-33	View kit →	2 × 10000	8	CX10, CX15, GX7,5, GX10
611-007-08	View line →	611-007-34	View kit →	2 × 12000	8	CX10, CX15, GX7,5, GX10
611-011-05	View line →	611-011-31	View kit →	2 × 5000	10	CX25, GX15
611-011-06	View line →	611-011-32	View kit →	2 × 7000	10	CX25, GX15
611-011-07	View line →	611-011-33	View kit →	2 × 9000	10	CX25, GX15
611-011-18	View line →	611-011-34	View kit →	2 × 12000	10	CX25, GX15
611-011-19	View line →	611-011-35	View kit →	2 × 15000	10	CX25, GX15
611-015-06	View line →	611-015-31	View kit →	2 × 5000	12	CX45, GX25
611-015-07	View line →	611-015-32	View kit →	2 × 9000	12	CX45, GX25
611-015-08	View line →	611-015-33	View kit →	2 × 12000	12	CX45, GX25
611-015-09	View line →	611-015-34	View kit →	2 × 17000	12	CX45, GX25

Leading the line

Art. No.	Item
480-501-01R	Double fairlead (25 mm or 30 mm stanchion), spring-loaded "push-and-twist" stainless bracket	View part →
405-001-40R	Twin-cam block PBB50 (max Ø10 mm line)	View part →
406-001-40R	Twin-cam block PBB60 (Ø12 mm line)	View part →

Line lock: pull the conical terminal over the line, fold the core over the set of wedges, insert the wedges in the terminal, fit the drum or halyard swivel and tighten the locking screw.

Code 0 Halyard with 2:1 Purchase

To reach the luff tension a Code 0 needs, the halyard load must be higher than normal halyard boxes and stoppers can handle. Arrange a 2:1 purchase: fix the dead end of the halyard in the mast and run it through a block attached to the halyard swivel. The position on the mast must be specified by Selden; in most cases Code 0 sails are hoisted lower than gennakers and spinnakers.

Block for 2:1 purchase

Art. No.	Dim.	Weight (g)	L1	L2	W	D	Safe working load (kg)	Breaking load (kg)	Max line size (mm)	To be used for
403-501-01R	30	100	68	21	13	8	1500	3000	10	CX15	View block →
404-501-01R	40	187	85	26	18	10	2500	5000	12	CX25, GX25	View block →
405-501-01R	50	335	104	31	24	12	4000	8000	16	CX45	View block →

Dead end fitting

Art. No.	Mast section	Max rope Ø (mm)	Max RM at 30° heel (kNm)
508-843-01R	E177, E206, C137, C153, C156, C175, C180, C192, C193, C208, C211, C227, F170, F176, F185, F194, F199, F212, F217, F228	12	45	View fitting →
508-844-01R	E206, C225, C242, C245, C261, C264, C285, F246, F252, F265, F272, F286, F291, F305	14	180	View fitting →
508-838-01R	C280, C321, C365, F324, F370, F406	16	350	View fitting →

Thimbles, Cable Clamps and Adapters

Thimbles Art. No. (2 pcs)	For AT-cable Ø (mm)	To be used for
545-114-01	8-9	CX10	View part →
545-116-01	10-11	CX10, CX15	View part →
545-216-01	12-13	CX25	View part →
545-416-01	14-16	CX45	View part →

Cable clamps Art. No. (2 pcs)	For AT-cable Ø (mm)
301-311-01	9-11	View part →
301-312-01	12-13	View part →
301-313-01	14-15	View part →

Cable clamps fit thimbles to the Selden AT-cable; heat shrink tubing included. For CX25 and CX45, double clamps are required at each end of the AT-cable.

Adapters add a tack swivel to a CX furler, so the CX drum can be used for both Code 0 and asymmetric spinnaker. Patented line lock and Torlon ball bearings.

Art. No.	Converts	To
545-028-11	CX10	GX7.5	View adapter →
545-128-11	CX15	GX10	View adapter →
545-228-11	CX25	GX15	View adapter →
545-428-11	CX45	GX 25	View adapter →

Tack Swivel, Shackles and Masthead Bracket

Adjustable Tack Swivel (ATS)

Slides up and down the AT-cable on a downhaul from the cockpit to trim the gennaker luff while the AT-cable stays permanently tensioned. The sliding sleeve is in two halves, so it retrofits onto an AT-cable.

Art. No.	To be used for
545-040-10	GX7.5	View part →
545-140-10	GX10	View part →
545-240-10	GX15	View part →
545-440-10	GX25	View part →

Low friction shackle

Big rounded loop for low-friction line passage; used to tension a CX with 2:1 purchase and to haul the CX out on a bowsprit from the foredeck. High strength Duplex steel.

Art. No.	Dimension	Weight (g)	Safe working load (kg)	Breaking load (kg)	To be used for
307-435-01R	50	70	900	1800	CX10, GX7,5, GX10	View shackle →
307-436-01R	60	118	1500	3000	CX15, GX15	View shackle →
307-437-01R	80	278	2500	5000	CX25, GX25	View shackle →
307-438-01R	100	540	4000	8000	CX45	View shackle →

Anti-Twist shackle

Optional shackle between halyard and halyard swivel; the long pin leans on the mast and stops a "soft" halyard twisting. Not needed with a 2:1 halyard or a high quality Dyneema® halyard.

Art. No.	Dimension	To be used for
545-030-01R	M6, L = 220 mm	CX10, GX7.5, GX10	View shackle →
545-130-01R	M8, L = 220 mm	CX15, GX15	View shackle →
545-230-01R	M10, L = 280 mm	CX25, GX25	View shackle →
545-430-01R	M12, L = 390 mm	CX45	View shackle →

Bracket for masthead rigs

Moves the halyard forward so a GX halyard swivel clears the forestay on a masthead rig. For gennakers / asymmetric spinnakers only, not Code 0. Max righting moment at 30° heel: 35 kNm.