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OWNER'S MANUAL

Assembly and operating manual for the Selden Furlex 300H and 400H hydraulic jib furlers: stem-head requirements, hydraulic installation, forestay and foil calculations (wire and rod), rigging, manual operation and service.

DocumentSelden Furlex 300H & 400H Owner's Manual
FormatPDF · 32 pages · 1.9 MB
LanguageEnglish
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Owner's ManualPDF · 32 p.Rod forestay length calculationPDF · 1 p.
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SystemStem HeadForestay & FoilAssembly & RiggingSail DataOperationMaintenanceProducts
Selden Furlex 300H & 400H — Owner's Manual

System & Hydraulics

The double-groove luff foil is turned by a hydraulic motor driving a self-locking worm gear, controlled from a cockpit switch panel. Two hoses run from the motor to a through-deck fitting with a by-pass valve; quick couplings allow the drive unit to be removed. The forestay passes through the drive unit, which carries no forestay load; the torque is taken by the stem-head fitting. The rigging screw sits inside the drive-unit holding tube.

Value
Hydraulic motor Danfoss OML 12,5 cm3/rev or OML 20 cm3/rev
Max. recommended pressure 140 bar
Nominal speed 40 rpm at 10 litres/min (OML 12,5) or 20 litres/min (OML 20)
Normal working pressure (reefing / unfurling) 40 bar at 10 litres/min (OML 12,5) or 19 litres/min (OML 20)
Typical pump 24 volt, 1,5 kW (OML 12,5) or 3 kW (OML 20)
Hoses (below deck, not supplied) SAE 100R / ISO3949, min. 3/8", min. working pressure 140 bar, min. bend radius 150 mm (6"); threads G 3/8
Through-deck fitting Ø 60 mm hole through the deck (flange Ø 100 mm)
Stem-head torque (max. working load) 330 Nm (300 H), 725 Nm (400 H)
Rigging screw adjustment 100 mm (300 H), 110 mm (400 H)
  • Use an ecologically sound, biodegradable hydraulic oil; never mix fluids of different makes or types.
  • Blow all new hoses through with compressed air before fitting; mark hoses at the quick couplings – crossing them reverses the motor. Fit the protective covers whenever couplings are disconnected; always check the couplings are locked.
  • After installation: Reefing switch must turn the foil anti-clockwise, Unfurling switch clockwise; otherwise swap the yellow and green leads (or cross the hoses).
  • Send dimensions A and B (drive unit to through-deck fitting) to your dealer to have the motor hoses made up. Protect hoses and fitting from the anchor chain.

Stem-Head Fitting & Lower Toggle

The torsion-resistant lower toggle may be fitted athwartships or fore-and-aft. Check that the drive unit (max width 170 mm) clears the pulpit and anchor. Any added link or toggle must have at least the torque capacity required of the stem-head fitting.

Wire Ø D1 G L Ø D2 Ø D3 H V
8 14 15 30 57 126 298 112
10 14 15 30 57 126 298 112
12 19 19 35 76 136 398 112
12 (as printed) 22 23 40 76 136 403 120
Part No. Lower toggle Wire Length H
517-048-02 Fork/fork toggle Ø8 mm 50 View part →
517-051-02 Fork/fork toggle Ø10 mm 55 Ask us to source it →
517-52-02 Fork/fork toggle (number as printed) Ø12 mm 65 Ask us to source it →
517-053-02 Fork/fork toggle Ø14 mm 80 View part →
174-124 T/fork toggle – 100 Ask us to source it →

All measurements in millimetres; letters refer to figs. 9.1 and 9.2 in the PDF. The last row is printed as wire 12 again.

Forestay & Luff Extrusion Calculation

WL = FL – T (rigging screw 50% extended; also deduct any extra link or toggle). E + F = WL – (A + B); E = largest number of 2400 mm extrusions shorter than E + F; F = top extrusion; G = top distance tube = F – deduction.

Furlex / stay T A + B G deduction
300 H Ø8 mm wire 360 mm 1300 mm 380 mm
300 H Ø10 mm wire 370 mm 1290 mm 400 mm
400 H Ø12 mm wire 490 mm 1350 mm 490 mm
400 H Ø14 mm wire 490 mm 1350 mm 490 mm
300 H Rod 7.5 360 mm 1350 mm 125 mm
300 H Rod 9.5 370 mm 1340 mm 125 mm
400 H Rod 11.1 490 mm 1420 mm 220 mm
400 H Rod 12.7 490 mm 1420 mm 220 mm
  • Example (300 H, Ø10 wire): FL 16.735 – 370 = WL 16.365; – 1.290 = 15.075; 6 profiles = 14.400; F = 675; G = 675 – 400 = 275.
  • Example (300 H, Rod 9.5, rod calculation sheet): 17650 – 370 = 17280; – 1340 = 15940; 14400; F = 1540; G = 1320 (the sheet deducts 220, as printed).
  • 300 H: F over 2000 mm → cut from a 2400 mm extrusion; 400–2000 mm → cut from the 2000 mm extrusion; under 400 mm → swap the top 2400 mm extrusion for the 2000 mm one (E – 400, F + 400).
  • 400 H: the top is normally cut from the 1700 mm (67") extrusion; if shorter than 700 mm (27 9/16") swap the top 2400 mm extrusion for the 1700 mm one (E – 700, F + 700).
  • Foil packs: 300 H one 1000 mm (39 3/8") extrusion with long joining sleeve, one 2000 mm (78 3/4"), 2400 mm extrusions and a 3 x 25 locking pin; 400 H one 1000 mm with long sleeve and bearing plug with bushes, one 1700 mm (67"), 5–8 off 2400 mm (94 1/2"); 400 H distance tube L = 2100 mm (82 11/16") at the sail feeder.

Forestay Terminal & Drive Unit

  • Chamfer the wire end and thread it from the top (twist anti-clockwise past snags); tape and cut at WL. Slide the drive unit over the 1000 mm extrusion from below.
  • Terminal M with washer over the wire, wedge on the core (core protrudes about 2 mm), strands spread evenly, former in Terminal F; check no strand lies in the wedge slot; locking adhesive and tighten hard (permanent).
  • Fit bushing and circular clip (bushing must rotate freely), then the rigging screw and lower toggle, fully extended for rigging.
  • Join drive unit and lower toggle with the clevis pin; fix the foil with the two stop screws (300 H: Torx 40, 400 H: Insex 8 mm) in the pre-drilled holes, locking adhesive, tighten hard.
  • 400H-Rod: drill two clearance holes in the top of the foil and fit the two-half top guard with locking adhesive.

Halyard, Tension & Sail

  • Halyard at least 10° from the forestay, otherwise use the halyard leads 508-128 (two supplied, fitted side by side; drill 5.2 / Ø 5.3 mm, greased self-tapping M6). Checklist: halyard angles out 5–10° with sail set.
  • Tension the forestay to max. 25% of its breaking load with the backstay tensioner (higher for a limited period).
  • Sail rolls onto the starboard side of the foil (sun strip on starboard). Turn the tack ring anti-clockwise to its stop, lash the prefeeder with max. 300 mm (12") of line, hoist in the starboard groove.
  • Sail luff more than 500 mm (19") shorter than max. luff length: fit a permanent wire head pendant.

Sail Measurements (mm)

Furlex Extrusion Groove width A Groove Ø B Max luff tape Cut-back CB F E F+E
300 H 39/27 3.0 Ø 7.5 Ø 6.5 80 550 490 1040
400 H 48/34 3.0 Ø 8 Ø 6.5 100 650 675 1345

Max. luff length = FL – (F + E). Webbing at head and tack; the luff tape hard line should end above the sail feed. A high-cut clew keeps a constant sheet angle when reefing.

Operation & Manual Override

  • Unfurl: haul in the sheet while pressing Unfurling; stop when fully open – keeping the switch pressed starts furling the wrong way.
  • Furl / reef: press Reefing while easing the sheet under some resistance; always roll in at least 2–3 revolutions. The tack ring turns about one revolution freely to flatten the reefed sail.
  • Manual: switch the by-pass valve on the through-deck fitting to "Winch handle" and use a standard winch handle; clockwise reefs. The motor cannot start in this position. Never leave the handle in the drive unit.

Maintenance & Dismantling

  • Rinse with fresh water, especially the lower unit and tack swivel – the most important service item. Silicone-free polish or wax on anodized surfaces.
  • Grease sparingly with Furlex grease 312-501: both halyard swivel bearings (inject into the ball-race gaps), tack ring top bearing (gap) and bottom bearing (hole in the centre of the tack ring).
  • Drive unit gearing: lithium grease SKF LGEP 2/04; service (cleaning, glands, O-rings, re-greasing) at intervals of no more than 5 years, more often for charter or circumnavigation.
  • Terminal threads are locked: heat Terminal F to approx 100°C (212°F) to unscrew. With Ø 14 mm wire the male terminal is larger than the foil – unrig, or saw the wire above it (stay shortened by 80 mm). Seized connecting plates: drill out with Ø 8 mm.
  • Hydraulic motor: remove only if the winch handle cannot turn the unit or the motor must be replaced (4 Allen screws 5 mm, 3 dismantling screws 2.5 mm); cover and motor are one unit. Do not dismantle the halyard swivel.
  • Store rinsed, dry and ventilated; never wrap damp in plastic. The drive unit detaches for separate storage.

Need a part that isn't listed? Ask us to source it and quote the part number from the PDF.

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