13
T
FL
With rigging screw
:
(Riggingscrew 50% extended.
Adjustable ±50 mm)
Existing forestay length (FL), including rigging screw
(See Fig. 3.5.a)
Without rigging screw:
Cutting measurement. The new forestay wire is to be marked
at this point.
Ø 12 mm wire: 190 mm (7 31/64”)
Ø 14 mm wire: 190 mm (7 31/64”)
If links or extra toggles are to be used, deduct this length (H) from FL.
(See table 3.3.3.)
=
Furlex fitted above deck, but with the forestay fitting in the
anchor well.
Use a Furlex extension link (not 500 S). For a larger gap, (or
for 500 S,) use a custom made stainless steel bar or rod stay.
See specifications on page 11.
Short wire pendants are not recommended as forestay forces
may not be distributed evenly, and wire will not resist the
torque which may be produced.
3.5 Calculating the length of the forestay wire
1. Determine the rake of the mast with the fore-/backstay tensioned.
2. Slacken the
backstay
as much as possible, but make sure that any rigging screw is not unscrewed so
far that the threads are no longer visible ”on the inside”. The forestay setting should not be adjusted.
If there is insufficient adjustment in the backstay, and the forestay must be adjusted to allow removal,
first mark its thread with adhesive tape.
3. Pull the masthead forward using the genoa halyard. Secure the halyard using a ”D” shackle or tie it
to a strong deck fitting. For safety reasons, do not use the halyard snap shackle.
Always use a strong ”D” shackle or tie the halyard !
4. Take down the forestay. If it was slackened, adjust the rigging screw back to the tape marks.
5. Measure the forestay length (FL)
with just enough tension to keep it straight.
6. Enter the measurement in
”Table 1”
below, under the heading ”Your forestay”, in the row
marked FL.
7. Calculate the new wire length WL in Table 1. Refer to the column marked “example” to see how
this is done.
Your
forestay
Example
(400 S/Ø14)
with rigging screw
50% extended
H
WL
Deduction for lower wire terminal:
400 S
500 S
Ø 12 mm wire: 325 mm (12 13/16”)
Ø 14 mm wire: 325 mm (12 13/16”)
-
-
190
=
13100
Fig. 3.4.d.
18.000
325
17.675
Ø 16 mm wire: 190 mm (7 31/64”) Ø 16 mm wire: 325 mm (12 13/16”)
Table1: Calculation of forestay wire length
3.5.1
