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Harken REFLEX FURLING Unit 1, Installation Manual, Page: 7 / 24

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Harken REFLEX FURLING Unit 1 Installation Manual Download Page 7

Reflex furler

7

Preassembly 

Cable Length

REFLEX CABLE LENGTH WORKSHEET

1. Use long tape measure 

secured to shackle and hoisted 

to masthead. Measure FH length 

from full-hoist shackle to extended 

bowsprit fitting with mast in 

forward setting

2. Determine A dimension depending on unit size and fill in the chart below. 

Note: If using a 2:1 soft attach, measure or estimate the lowest A dimension.

A - Bottom of unit to bearing point of threaded adapter

Threaded adapter

Unit 1 part no. and A distance

Unit 2 part no. and A distance

2:1 soft attachment

7351.20

7352.20

D-shackle

7351.20

28 mm

1.12"

7352.21

38 mm

1.49"

Snap shackle

7351.20

55 mm

2.16"

7352.22

61 mm

2.41"

Cable length worksheet

Description

Unit 1

Unit 2

mm

in

mm

in

FH

   Full hoist shackle to bow forward attachment

 A

    Threaded adapter length to bottom of unit                  

Subtract 

 L

    Length (FH minus A)       Length (L) is also the cable length 

CL 

                              

 L

 A

 A

 A

 FH

Use rig dimensions and worksheet below 

to determine cable length. Determine final 

measurements when building the terminals. 

I

MPORTANT! Use mast forward position. 

Do not 

make cable too long or it cannot tension. 

3. Use the worksheet below to determine the cable length (CL). Note the cable length (CL) is equal to the length (L). 

Make final length adjustments during assembly. The lengths below accommodate cable stretch when the halyard is 

tensioned. 

Summary of Contents for REFLEX FURLING Unit 1

Page 1: ...Parts 4 Additional parts required tools 5 Dimensions sailmaker s Instructions 6 Cable length worksheet 7 Assembly Threaded adapter 8 Terminating torsion cable to head swivel 9 11 Terminating torsion cable to tack swivel 11 Determining cable length at boat 12 Cutting torsion cable and final assembly 13 14 Commissioning Loading furling line in drive unit 15 Mounting fairleads line to cockpit 16 Atta...

Page 2: ...esponsibility for damage or harm caused by not observing the safety requirements and instructions in this manual See limited warranty general warnings and instructions in www harken com manuals Purpose The Harken Reflex furling system for asymmetric spinnakers is used for handling free flying downwind and reaching sails These sails have a loose positive luff that is longer than the leech and are c...

Page 3: ... by 10 Unit size Unit part no Intended application Typical boat length Maximum sail area m ft m2 ft2 1 7351 10 Asymmetric spinnaker 7 5 11 25 36 112 1200 7361 10 code zero 6 7 10 22 32 60 650 2 7352 10 Asymmetric spinnaker 10 14 34 45 168 1800 7362 10 code zero 9 12 30 40 84 900 Terms Set screw holes Thimble Lineguard Drive sheave Flexible cowling T slot Locking spring pin T foot Tack swivel termi...

Page 4: ...0M 20 12 m 66 7352 10 25M 25 m 82 Torsion cable clamp set 7357 7358 Snap shackle threaded adapter 7351 20 7352 20 Optional components Fixed tack terminal code zero sail 7351 27 7352 27 Reflex torsion cable spool 914 m 3000 7371 SPOOL 7372 SPOOL D shackle threaded adapter 7351 21 7352 21 D shackle only high resistance HR 2109 6 mm HR 2116 8 mm HR 2 1 soft attachment threaded adapter 7351 22 7352 22...

Page 5: ...ort tape measure 5 Heat gun 3 Hex keys 1 3 Sail attachments Use a shorter soft shackle for head of sail and a longer soft shackle for the tack of sail Consult a rigging supplier a knot tying book or see a link to instructions at www harken com knots Unit Line diameter Length of loop cruise Length of loop race 1 6 mm 1 4 Measure from furler to aft cockpit block Use J dimension plus bow sprit minus ...

Page 6: ...Note offset H at the top and offset D at the bottom When using system for asymmetric spinnakers D represents the attachment point to the tack swivel terminal Luff length code zero Note offset H at the top and offset E at the bottom representing the attachment points for the sail cloth Code zero luff cable The Reflex torsion cable is designed for use with asymmetric sails and transmits torque at lo...

Page 7: ...hackle 7351 20 28 mm 1 12 7352 21 38 mm 1 49 Snap shackle 7351 20 55 mm 2 16 7352 22 61 mm 2 41 Cable length worksheet Description Unit 1 Unit 2 mm in mm in FH Full hoist shackle to bow forward attachment A Threaded adapter length to bottom of unit Subtract L Length FH minus A Length L is also the cable length CL L A A A FH Use rig dimensions and worksheet below to determine cable length Determine...

Page 8: ...pendicular position will depend on the fitting on the bow sprit or extended bow fitting Thread the adapter completely into the drive unit until it stops Install set screws using threadlocking solution such as blue Loctite adhesive 2 1 soft attach threaded adapter installs the same way as above Tip Load the loop or 2 1 adjuster in the adapter before installing Tip The D shackle adapter and snap sha...

Page 9: ...and leave enough space to load the cable end 3 Insert the end of the cable through thimble at the head swivel and position it at the desired location on the cable Slide the clamp assembly over the end of the cable as shown Tip Secure the head swivel in a vise when building the terminal to hold it in place 1 Locate the clamp halves and the long fasteners M5 X 25 mm as shown Cut the supplied heat sh...

Page 10: ...eplace with a short fastener using blue Loctite 5 Gradually tighten each of the four 4 corner fasteners alternating to maintain a relatively even gap between clamp halves When the gap is about 8 mm 5 16 locate two 2 of the short fasteners supplied M5 X 16 mm Apply blue Loctiteand thread the fasteners into the two remaining screw locations It is not necessary to tighten these at this time 8 Gradual...

Page 11: ... the amount shown in the chart Clamp cable and use hacksaw to cut the cable leaving a tail of Unit 1 90 mm 3 5 Unit 2 100 mm 4 Tip Leave a longer tail if you are not sure about measuerments See following pages on determining length at boat Stretch length at load Estimated stretch length at load Full hoist FH length Unit 1 Unit 2 14 to 16 m 45 to 53 200 mm 8 16 to 18 m 53 to 59 240 mm 9 1 2 300 mm ...

Page 12: ...ine all the way down Slip the bottom of the cable through the thimble in the tack terminal Pull the cable as tight as you can by hand and wrap a piece of electrical tape where the cable enters the thimble as a mark 1 Dry fit setup at boat Hoist the head swivel with cable installed to the top of the mast Bottom end of cable will be open no lower unit Install the tack swivel terminal on the drive un...

Page 13: ...slipping cable into thimble 5 Setting the length Slip the cable into the thimble and pull it through until the mark from step 4 is at the point where the cable enters the thimble 3 Cutting the cable Lower the cable to the dock Clamp the cable to the dock and cut the cable using a hacksaw Note Cutting the cable at the mark may seem too short however when the hal yard tensions the cable will stretch...

Page 14: ...ansmits torque at lower halyard loads IMPORTANT Over tensioning the halyard can make furling more difficult and can damage components Adjust the tack line if necessary 6 Building the tack terminal Follow the procedure used to build the head swivel terminal Tip Wait to shrink the heat shrink tub ing until the sail is hoisted and sailed in case length adjustments are necessary Do not use heat shrink...

Page 15: ...heave and the flexible cowling Make sure the torsion cable is not attached to the drive unit Load the looped furling line into the line guard Rotate the drive sheave as you press the line into position around the drive sheave Load the final part by pulling the line from outside the drive unit ...

Page 16: ...ds to stanchion so the black plastic clamp side is inboard and the metal line guide is outboard Tip Start all four 4 screws before tightening Inboard Outboard Load the furling line loop into the fairleads by rotating the line to line up with the openings Push the line into place 7355 fairlead 7359 fairlead with cleats Aft block with bungee Aft block is used at the end of the system For racing Moun...

Page 17: ...p keep the Reflex furling system spinnaker sheets and halyard outside of the jib sheets Attach the head of the sail to the eye in the head swivel using a soft shackle or lashing Secure tack of sail using soft attach long shackle Make length adjustable for adjustment when sail is finally fitted Load the Reflex swivel tack terminal into the T slot on the lower drive unit Attach the unit to the bow s...

Page 18: ...amount the sail flogs From a broad reach ease the sheets to reduce sail power Start furling and then ease more Operation The sail tack is on a swivel and does not begin furling until most of the sail is furled Continue furling by easing the sheet part way and furling so flogging is minimized and there is some drag on the sheets Furl until the clew pennant or sheets are securely wrapped around the ...

Page 19: ...ting Furling line led aft below jib sheets to aft lead block Spinnaker sheets attached and led around forestay and aft to spinnaker blocks outside and above all other sheets Halyard attached Hoisting steps Pull tack out to pole if adjustable Pull bowsprit out Hoist furled sail from the weather side to avoid having to go under the foot of the jib The head swivel stays ahead of the rig Work the furl...

Page 20: ...ay have an existing torsion rope in the luff Talk to your sailmaker about installing a Harken Reflex tor sion cable Requires a separate Dyneema type tension bearing luff rope Changing Sails With the new sail furled and ready to go changing sails is quick and easy Simply pull the spring pin slide out one 1 assembly and slide the new sail assembly into the lower drive unit You can even switch from a...

Page 21: ...terminal Flush bearings with soapy water and rinse as you rotate tack swivel Lower drive unit Remove furling line and flush lower unit on either side of the feeder Rotate the drive sheave to flush bearings Tip The drive unit easily removes from the sail for throrough flushing Turn unit upside down and flush interior T slot mechanism Periodically remove the Reflex swivel tack terminal from the T sl...

Page 22: ...Reflex furler 22 Warranty www harken com manuals or call write email or fax Harken Inc Pewaukee WI USA ...

Page 23: ...Reflex furler 23 ...

Page 24: ...nd Ltd 158 Beaumont Street Unit 11 Orams Marine Centre Westhaven Aukland 1010 New Zealand Telephone 64 9 303 3744 Fax 64 9 307 7987 Web harken co nz Email harken harken co nz Harken Polska Sp z o o ul Przasnyska 6A 01 756 Warszawa Poland Tel 48 22 561 93 93 Fax 48 22 839 22 75 Web harken pl Email polska harken pl Harken Sweden AB Main Office and Harken Brandstore Västmannagatan 81B SE 113 26 Stock...

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