Selden RB User manual

1
Contents: Page: Contents: Page:
Product description 2 Spare mainsail 9
Checks and adjustments before stepping 4 The sail 10
Operation & operational hints 6 Running cables 11
Fitting and hoisting the sail 8 Maintenance 12
Before sailing 9 Dismantling 14
Manual for Furling mast
TYPE RB/RC
595-020-E
2007-10-03

2
Product description
Seldén Mast in-mast furling mast is a mainsail reefing and furling system.
The furling geer has been developed from experience gained from FURLEX foresail roller-reefing, and is
dimensioned for the toughest conditions.
The unique design of the halyard swivel bearing distributes the load over the whole ball-race to give
smoother furling and the lowest possible friction.
The entire reefing mechanism can be easily removed from the mast for service. Stainless steel thread inserts
are used for all screws, so that dismantling is easy even after many years usage in a corrosive environment.
The mast extrusion has an additional luff groove for a storm trysail or spare main. A foresail with rope luff
could be hoisted.
This Instruction Manual has been compiled to give you information on the in-mast reefing system. Study it
and follow the instructions carefully, and we guarantee you many years of pleasurable use from your Seldén
Mast in-mast furling mast.
Follow the relevant rigging instructions in our booklet ”HINTS AND ADVICE” for tuning the rig.
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Asymmetric luff extrusion giving reduced initial resistance to reefing due to easier bending of the luff.
Sail compartment
Fig. 2:1
Cable conduits

3
Extra sheave box for furling
jib halyard
Top swivel
Halyard swivel
Topping lift, 1:2 ratio
Sail feeder
Clew outhaul car
Clew outhaul
Reefing winch
Kicker bracket
Turning blocks
Access to sail feeder and haly-
ard swivel
Access to tack hook and
tensioning screw
Access for
greasing
Opening for in-mast
stowage of halyard tail
Cable exit
Fig 3.1
Outhaul fairlead
Reefing gear
(in-mast furling gear)

4
1. Remove the access covers.
Depress one button and push. Lift the opposite end and remove.
Fig. 4.1
Fig. 4.2
Luff extrusion adjustment
Checking luff extrusion tension prior to stepping the mast
The luff extrusion is correctly tensioned before leaving the factory, but tension can be re-checked before
stepping
the mast.
Lay the mast horizontally, and check that the extrusion is just clear of the mast wall at its mid point. If adjustment is
neccesary see points 1-5 below.
If adjustment has to be made after the mast has been stepped, then the luff extrusion should be so tensioned that it
does not beat against the mast walling when you grasp it throught the upper access hole and shake it.
Most of the extrusion will be resting on the aft face of the sail compartment when sailing.
DO NOT OVER-TENSION! A luff extrusion that is over-tensioned will increased furling friction.

5
1.
2.
Undo the lock retaining screw and free the
locking tube.
Push the locking tube upwards
while at the samt time
turning the tack hook o
ut of its key-hole slot.
The ten-
sioning screw is now freed.
Twist the tack hook back to
w
ards the t
e
nsioning screw
so that it will not get snagged d
uring step 4.
so that it will not get snagged during step 4.so that it will not get snagged d
3.
4.
Using an adjustable wrench prevent the locking tube
from turning while adjusting the luff extrusion tension
by turning the reefi ng winch.
The fi nal turn should ensure that the tack hook and its
key-hole slot will mate up.
Lower the locking tube while at
the same time enga-
ging the tack hook into the key-hole slot.
Replace the lock retaining screw.
Locking tube
Locking retaining screw
Tensioning screw
Tack hook

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Operation & Operational hints
Reefing and unreefing is accomplished with a reefing line and an outhaul, either through working at the mast,
(see fig. 7.1). or by the lines for operation from the cockpit.
If in-mast furling mast is to be operated from the cockpit then a reefing line in the form of an endless loop in
combination with a self-tailing winch is recommended. The loop should be sufficient long to permit easy remo-
val from the winch. Slack on the unloaded side of the loop should be taken up and held with the aid of a cleat or
a Clam-cleat. A rope stopper can also be used, but the reefing line will have to be spliced after being threaded
through it.
A self-tailing winch is also recommended for the outhaul. Fig. 6.1 and 6.2 illustrate two possible arrangements.
Arrangement with self-tailing winches and belaying cleat for the endless reefing line.
Layout 1
Layout 2
Fig. 6.1
Arrangement with conventional winch, two Clam-cleats and a rope stopper. The rope stopper should be of the
type where the line can be eased off. (Rutgerson Ram-Jam for example).
Lead blocks
Kicker bracket/Turning blocks
Outhaul
Reefing line loop. Aluminium Clam-cleat.
(CL 238, incl. fairlead)
Rope stoppers
Lead blocks
Kicker bracket/Turning blocks
Outhaul
Reefing line loop.
Aluminium Clam-cleats.
(CL 238, incl. fairlead) Fig. 6.2

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Alternative clew outhaul arrangement.
When reefing from the cockpit the reefing winch must be set to ”FREE”.
Use 10 mm diameter double plaited line for the endless loop.
The mast kicking bracket/turning block on the mast has removable sheaves to allow a pre-spliced endless
loop to be threaded.
Note. This turnings block are designed for use on the reefing system only.
If deck lead blocks are used we recommend those with three removable sheaves from Seldén Mast. (Part
No. 538-809-01. A pre-spliced endless loop can be threaded through them.
If fittings from other suppliers are used they should have similar features. Fittings with permanent sheaves
will entail splicing in situ, with the awkwardness that entails.
Operating hints
Unfurling
Free both sides of the endless loop from the winch and Clam-Cleat. It will then slide on the reefing winch.
Pull out the sail with the outhaul line.
Furling
The leech should be kept fairly tight when reefing or furling. Adjust the topping lift to achieve this, and the
sail will form a good tight roll around the luff extrusion.
Whilst keeping slight tension on the outhaul line, pull in the sail using the winch for the endless reefing
loop.
Reefing
Carefully slacken off the outhaul line.
Whilst continuing to ease off the outhaul, roll in the desired amount of sail.
When the desired amount of sail is rolled in, use the outhaul to stretch the foot of the sail.
When operating from the cockpit:
Make both ”sides” of the reefing line fast to prevent slip on the reefing winch. Finally, tension the outhaul.
The reefing winch should be locked (”IN”) when sailing in heavy weather so as to avoid its rotating due to
line slip. This will not prevent further reefing, but the lock must be released before unreefing.
When working at the mast:
Hold the sail to its reefed size by using the stop on the reefing winch (”IN”).
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1.
2.
1.
2.
1.
2.
3.
WARNING! Never leave the handle in the reefing winch!
It will rotate very rapidly when the sail is unfurled.
Fig. 7.1 Fig. 7.2

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4. Join the tack to the tack hook.
Remove the lock retaining screw to
free the locking tube.
Twist the tack hook away from
the keyhole slot while at the same
time raising the locking tube. (The
tensioning screw is now exposed).
Hock on the sail tack.
Lower the locking tube again while
at the same time re-engaging the
tack hock into the keyhole slot. Re-
place the lock retaining screw.
Fitting and hoisting sail
1. Check that the tack and head of the sail are made as illustrated on page 10. An incorrectly made tack can
cause wrinkles in the sail and make smooth furling difficult.
3. Join the head to the halyard swivel.
Fig. 8.1 Fig. 8.2
2. Remove the covers.
Depress one button and push. Lift the opposite end and remove.
Locking tube
Lock
re
Lock reLock
taining screw
Tack hock
Tack hock

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Anti-vibration strip
Vibration can occur in any aluminium mast of normal design. With wind coming from approximately abeam at
speeds of 4–12 Knots the mast oscillates longitudinally at a rate of 3–6 cycles per second. Every Seldén Mast
in-mast furling mast is supplied with an ”anti-vibration strip” for hoisting in the integral sail groove to prevent
vibration starting. It will also reduce wind noise.
Port
Fig. 9.1
Starboard
Before sailing
1. Check that the sail is correctly furled on the luff extrusion: i.e. to its starboard side. (See fig. 9.1).
2. Whilst still on the mooring furl and unfurl the sail a couple of times to ensure that the system works as it
should, and to familiarise yourself with its operation, and also to check that the sail is correct size.
3. Adjust the topping lift to achieve the desired sail shape. The topping lift determines sail twist; its effect
being comparable to changing foresail sheeting angles.
Note. Turn the reefing winch clockwise for correct
furling.
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. Hoist the mainsail whilst simultaneously ensuring that it is feeding correctly into the luff extrusion.
6. Set the halyard and cleat it with the rope stopper. The halyard tail can be stowed in the mast by
feeding it through the hole just below the halyard winch.
7
. Furl the sail until the clew is exposed. The luff extrusion is asymmetrical to facilitate rolling in one direc-
tion, and the sail should always be rolled onto the starboard side of the luff extrusion. The reefi ng winch
should be turned clockwise. See fi g. 9.1.
8
. Attach the clew to the outhaul car.
Spare mainsail
The integral luff-groove on the after face of the mast can med used for hoisting a spare sail. A foresail made to fi t
the Furlex luff foul can be used. The luff groove dimensions are the same as those for the roller extrusion, as shown
in fi g. 10.1.
If the spare sail is fi tted with slides, then Aquabatten No. A032 or Rutgerson 101 are recommended.

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Max Sail Space
OS
20
2
5
2
5
A
T
100
B
30
Max 20
Min
The sail
The luff extrusion is asymmetrically shaped to help overcome initial resistance when starting to furl. Do not use
too heavy sail cloth in the luff area.
To improve sail shape when reefed and to reduce draft. ”Luff foam” may be used along the luff. The foam should
not be placed closer than 50 mm (2”) from the front edge of the luff as it will then increase initail reefing resis-
tance.
Sail dimensions
We recommend maxium 8 mm (5/16”) diameter luff-rope/luff-tape (maximum 7 mm (9/32”) hard line).
Luff groove dimensions are shown in fig. 10.2.
Head and tack tapes should be of soft quality which can foald easily. Do not use metal eyelets on them.
The clew cringle must not be thicker than 14 mm (35/64”) in order to fit the outhaul block.
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Fig. 10.1
Extrusion
A
B
T
R 214/122
600
400
130
R 232/126
600
400
130
R 260/136
600
400
130
R 290/150
700
500
140
Boom extrusion
OS
128/90
250
150/105
250
162/125
250
189/132
350
206/139
350

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When retro-fi tting cables from the front of the mast
run them through the halyard chamber as illustra-
ted. Pull the cables tight to prevent them slapping
the extrusion later.
Cables for forward- facing electrical installations are
held in place with an ”ETHAFOAM” pad to eliminate
slapping.
If additional cables from mid mast installations are
required, proceed as follows.
Lay the mast with forward face uppermost so that
the cables will rest in one comer of the conduit.
Drill the exit hole for the cable through the other
corner and forward of the cable. Use great caution
when drilling so as not to damage the cable.
Carefully burr the hole to eliminate any sharp
edges that could cause chafe. Some tape around
the cable will give added protection.
1.
2.
3.
Running cables
All in-mast furling mast extrusions have one or more cable conduits. These run uninterrupted to the mast heel
even on keel stepped masts.
A messenger is threaded through all empty conduits at the factory to facilitate cable drawing.
A new messenger should be drawn through a conduit at the same time as a cable is drawn through. This will
facilitate the running of additional cables.
If an existing cable should prevent a new one being run, it should be extracted after first having attached a new
messenger to it to take its place in the conduit. That messenger can then be used to pull two or more cables
through the conduit simultaneously.
Cables are led into a conduit at the masthead through a hole in the side of the mast extrusion. Cables should be
over-length. The head box can then later be removed without the need to disconnect electric installations. Cable
exits are located in the mast heel casting.
Extrusion:
232/126
260/136
290/150
Fig. 11.1 Fig. 11.2
Extrusion:
214/122

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Maintenance of the in-mast furling mast
Periodic Maintenance
Maintenance should be undertaken at least once a year. All bearings should be greased with GREASE (Part No.
312-501), a tube of which is delivered with the mast. Read the following instructions and fig. 13. l.
When greasing bearings and gears, do not over-grease. A thin coating of evenly applied grease is sufficient.
TOP SWIVEL:
The bearing has a lubrication hole  marked ”GREASE” where the grease should be injected. Access through
the sail slot.
HALYARD SWIVEL:
Lubricate the swivel by injecting grease into the gaps  &  in the ring. This is best done through the upper
access hole.
IN-MAST FURLING MAST GEAR.
Lift the rubber boot and grease the upper shaft bearing .
Access is from the lower access hole.
The lower parts are accessable for greasing after the small oval plastic plug on a level with the reefing winch
has been removed.
Grease the bevel gears  and ball-bearings  & .
All grease points are shown in fig. 13.1.
Complete Service
It is a good idea after some years use to dismantle the gear for thorough cleaning and re-greasing. The in-mast
furling mast is built so that servicing will be easy even after protracted use. Stainless steel thread inserts for all
screw fastenings ensure that corrosion is eliminated.
Dismantling procedures are described on page 14.

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Fig. 13:1

14
Removal of the in-mast furling mast gear from the mast
Lay the mast horizontally on trestles.
Detach the luff extrusion from the in-mast furling mast gear by slackening the tension and undoing the togg-
le. (See page 4, ”Luff extrusion adjustment”).
Remove the in-mast furling mast gear from the mast by undoing the eight holding bolts and taking it away
from the mast. (The in-mast furling mast gear can be removed even when the mast is stepped).
Remove the headbox by undoing the nuts on top and lifting it off.
Remove the top swivel from the luff extrusion.
Top swivel 540-104: Undo the two lower bolts. (The upper bolts holds the swivel halves together).
Top swivel 540-204: Undo the three lower bolts. (The upper bolts holds the swivel halves together).
Slide the halyard swivel off the luff extrusion.
1.
2.
3.
4.
5.
6.
Dismantling units with ball bearings
All dismantling should be undertaken on a clean unbroken surface. The various ball bearing units contain
many small parts that fall apart when dismantling. Lay the dismantled parts out in an orderly manner.
Dismantling the in-mast furling mast gear
Tools required:
– Hammer
– Punch, (6 –8 mm) (1/4–5/16”).
– Allen key, 6 mm.
– Screwdriver, small
Drive the spring-pin  from the large bevel gear.
Use hammer and punch.
Draw the shaft  up and out from the in-mast
furling mast gear.Take care of the balls and races
which will fall apart.
Drive out the spring-pin  from the small bevel
gear. Draw the gear and ball bearings off the shaft.
Take care of ball bearings and races, which will fall
apart.
Undo the four bolts holding the reefing winch, and
remove the winch from the holding bracket.
Remove loose components from the reverse side
of the winch, and remove the locking ring from the
shaft. The winch can then be dismantled.
Clean the ball bearings, their races, gears, and
winch components in a white spirit bath.
Reassemble all components in the reverse order.
The winch must be greased before reassembly. A
layer of grease in the cupped half of a ball-race will
hold the balls in place during assembly. Grease the
bevel gear teeth.
1.
2.
3.
4.
5.
6.
Fig 14.1

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540-107
or
540-209
Dismantling the halyard Swivel:
Tools required:
– Phillips screw-driver
1. RB/540-107 Remove both screws .
1. RC/540-209 Remove both screws  and the four screws
in the stainless steel ring.
2. Turn item  90° to free the bayonet fitting, and remove it.
3. Lift  off together with one ball bearing. Then lift off
the second ball bearing.
4. Clean ball bearings and their races in a white spirit bath.
5. Reassemble the components in the reverse order.
A layer of grease in the cupped half of a ball-race will hold
the balls in place during assembly.
NOTE.
Ball bearings may fall apart. Take care not to
loose any parts.
Fig. 15.1
Dismantling the top Swivel:
Tools required:
– Screw-driver
– Adjustable wrench
1. Remove the remaining upper screw/screws holding the two
halves of the casting together.
2. Dismantle the ball bearing and wash it in a white spirit
bath.
3. Reassemble in the reverse order. A layer of grease in the
cupped half of a ball-race will hold the balls in place
during assembly.
Fig. 15.2
1. RC/540-209 Remove both screws
1. RB/540-107 Remove both screws

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Important points to remember before setting sail
595-020-E Printed in Sweden.
The sail must always be rolled to the starboard side of the luff extrusion.
Tur
n the reefi ng
winch clock-
wise.
The leech should always be kept fairly taught when reefi ng or furling. Use the topping lift
!
Never leave winch handle in the reefi ng winch - it will rotate very fast when furling the sail.
Lock the reefi ng winch
at the mast when ree
fi ng in heavy we
ather.
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Seldén Mast AB, Sweden
Tel [phone]
Fax [phone]
e-mail [email protected]
Seldén Mast Limited, UK
Tel [phone]
Fax [phone]
e-mail [email protected]
Seldén Mast Inc., USA
Tel [phone]
Fax [phone]
e-mail [email protected]
Seldén Mast A/S, DK
Tel [phone]
Fax [phone]
e-mail [email protected]
Seldén Mid Europe B.V., NL
Tel [phone]
Fax [phone]
e-mail [email protected]
Seldén Mast SAS, FR
Tel [phone]
Fax [phone]
e-mail [email protected]
www.seldenmast.com
Dealer:
DINGHIESKEELBOATSYACHTS
The Seldén Group is the world’s leading manu-
facturer of masts and rigging systems in carbon
and aluminium for dinghies, keelboats and yachts.
The Group consists of Seldén Mast AB in Sweden,
Seldén Mast A/S in Denmark, Seldén Mast Ltd
in the UK, Seldén Mid Europe B.V. in the Nether-
lands, Seldén Mast SAS in France and Seldén
Mast Inc in the USA. Our well known brands
are Seldén and Furlex. The worldwide success of
Furlex has enabled us to build a network of over
750 authorised dealers covering the world’s mari-
ne markets. So wherever you sail, you can be sure
of fast access to our service,
spare parts and know-how.