Unit 1 – Harken 7411.11 1/2 MKIV Jib Reefing & Furling User Manual
Page 16
16
MKIV Underdeck Unit 1
Preassembly
Unit 1—Short Top Foil
If top foil is shorter than 7" (177.8 mm), use one of the following special techniques to ensure sufficient bearing
surface for the foil in the area of the halyard swivel.
2
1
/
2
(64 mm)
2" (51 mm)
1
1
/
2
" (38 mm)
1" (25 mm)
7" (178 mm) No special treatment required.
7" (178 mm)
6"–5" (152–130 mm) Do not use plastic bushing above
top connector.
6"–5" (150–130 mm)
4
1
/
2
"–4" (115–102 mm) Do not use plastic bushing
above top connector. Shorten top of connector and if
necessary shorten trim cap.
4
1
/
2
"–4" (115–100 mm)
3
1
/
2
"–3" (90–75 mm) Do not use plastic bushing above
top connector. Cut connector right at cross formed by
glue dispersion channels. Use single foil screw in top
foil only.
3
1
/
2
" - 3" (90 - 75 mm)
Under 1" (25 mm) Eliminate top foil and run foil higher
in torque tube.
Under 1" (25 mm)
Top Foil
Length from
Worksheet
1. Initial
top foil
cut length
2. Cut through
middle hole in
top foil.*
3. Shorten
full length
adjoining
foil by
cutting
through
middle
hole.*
4. Shorten
connector
5. Shorten
trim cap
Resulting Top
Foil Length
Length
2
1
/
2
"
(64 mm)
5
7
/
8
"
(149 mm)
4
1
/
8
"
(105 mm)
3
1
/
2
"
(89 mm)
No
2"
(51 mm)
5
3
/
8
"
(137 mm)
3
5
/
8
"
(92 mm)
3
1
/
2
"
(89 mm)
No
1
1
/
2
"
38 mm)
4
7
/
8
"
(124 mm)
3
1
/
8
"
(79 mm)
3
1
/
2
"
(89 mm)
Yes
1"
(25 mm)
4
3
/
8
"
(111 mm)
2
5
/
8
"
(67 mm)
3
1
/
4
"
(83 mm)
Yes
2
1
/
2
"–1" (64–25 mm) Shorten top foil and adjoining
full length foil so two screws are used to assemble joint
instead of four. Do not use plastic bushings above top
connector.
*To allow for saw cut, position blade so upper half of
middle hole is preserved.
Cut-Offs – Do Not Use
Cut-Offs
Do Not Use
Cut-Offs
Do Not Use
Cut-Offs
Do Not Use
UNIT 1