8
2.3 Wire length calculation
1. Slacken the backstay and/or the cap shrouds as much as possible, but make sure that no rigging screws are
unscrewed so far that the threads are no longer visible ”on the inside” of the rigging screw body. Ideally the
forestay setting should not be adjusted. However, if there is insufcient adjustment in the backstay, and the
forestay has a rigging screw, this can be adjusted as well. Just make sure to mark the thread with tape before
adjusting.
2. Pull the top of the mast forward using the genoa or spinnaker halyard. Secure the halyard using a ”D”
shackle or tie the halyard to a strong deck tting. For safety reasons, do not use any halyard snap shackles.
Secure the halyard tail after the halyard has been tensioned.
3. Go up the mast. Connect a free halyard to the forestay. Then detach the forestay and lower it using the free
halyard. Bring the stay down and place it on a at surface. If the forestay rigging screw was slackened,
adjust it back to the tape mark.
4. Measure the forestay length (FL) with just enough tension to keep the forestay straight on the ground.
Forestay length (FL) is the distance between the hole in the swaged top terminal and the hole in whatever
lower part that was attached directly to the hole in the chain plate. Enter the measurement into ”Table 1”
below, in the row marked FL.
Table 1: Calculation of forestay wire cutting length Your
forestay
Example
(404S/Ø12)
with rigging screw
50% extended
FL Existing forestay length (FL), including rigging screw (See Fig. 2.4.a) 9500
TDeduction for lower terminal: - - 280
HIf links or extra toggles are to be used, deduct this length (H) from FL.
(See table 6.7).
- - 0
WL Cutting measurement. The new forestay wire is to be marked at this point.
(For stays with swaged stud, WL equals the length of the nished stay as
shown in g 4.2.a. and NOT the cutting length)
= = 9220
If a Sta-lok terminal (with or without rigging screw) is included, the wire is supplied over-length. The wire has
a swaged eye terminal on one end while the other end is open (= without terminal). If your Furlex is supplied
with a xed-length forestay, with a swaged eye on one end and a swaged stud in the other end, skip this part
and go directly to 2.4. The same apply for rod stays.
If a stud-terminated stay is to be manufactured by a local rigger it is important to note that WL in this case
equals the length of the nished stay, from eye to end of stud, as shown in g. 2.4.a. WL is calculated in table 1.
Before assembly, an over-length wire (for Sta-lok) must be marked and nally cut to the correct length to t
the boat’s actual forestay length. To nd out the correct measurement, follow the steps below. If the mast is not
stepped, you can jump directly to step 4.
You can use the FURLEX CALCULATOR on our web site. Go directly to the calculator by
scanning the QR-code with your mobile device or visit www.seldenmast.com.
WIRE Without rigging screw: With rigging screw:
404S Ø 12 mm wire: 140 mm (5 33/64”)
Ø 14 mm wire: 155 mm (6 7/64”)
Ø 12 mm wire: 280 mm (11 1/32”)
Ø 14 mm wire: 285 mm (11 7/32”)
ROD Without rigging screw: With rigging screw:
404S Rod -30: 140 mm (5 33/64”)
Rod -40: 155 mm (6 7/64”)
Rod -30: 280 mm (11 1/32”)
Rod -40: 285 mm (11 7/32”)
