200 S
300 S
C+D
400 S
C
Your
extrusion
13
3.6.1
12.810
1.270
11.540
9.600
1.940
WL
Length of new rod forestay (as per
”Calculation Table 1”)
3 . 6 C a l c u l a t i n g t h e l e n g t h o f t h e l u ff e x t r u s i o n
1.
Insert the length of the new rod forestay (WL) as calculated in
”Calculation Table 1”
into
”Calculation Table 2”
, in the row marked WL.
2.
Calculate the number of full-length extrusions and the length of the top extrusion.
Fixed deduction (A + B):
Check that length of terminal part of stay matches the measurement in 3.3.2.
A+B
-
=
1395
=
-
12.810
C+D=
(4 sections)
-
500 S
C
Deduct from the C measurement:
200/300 S:
400 mm (15 3/4”)
400 S:
700 mm (27 9/16”)
500 S:
2800 mm (110”)
Add to the D measurement:
200/300 S:
400 mm (15 3/4”)
400 S:
700 mm (27 9/16”)
500 S:
2800 mm (110”)
D
Max. no. of 2400 mm (94 1/2”) extrusions whitch together
are shorter than C+D: [ ............x 2400 = C ]
C=
Length of top extrusion =
The top extrusion is normally cut from the 2000 mm (78 3/4”)(400 S 1700 mm
(67”)) extrusion. Round the edges of the cut end using a file.
If the top extrusion is shorter than 400 mm (15 3/4”) (200/300 S), 700 mm (27
9/16”) (400 S), 1000 mm (39 3/8”) (500 S), the joint will be too near the top. In
this case replace the uppermost full-length 2400 mm (500 S: 4800 mm) extru-
sion with the 2000 mm (78 3/4”) (400 S: 1700 mm (67”)) extrusion. In this way
the joint is moved 400 mm (15 3/4”) (400 S: 700 mm (27 9/16”); 500 S: 2800 mm
(110”)) down the stay.
Adjust the C and D measurements as follows:
-
1395
Max. no. of 4800 mm (189”) extrusions whitch together
are shorter than C+D: [ ............x 4800 = C ]
C=
-
1395
=
=
2115
Cont. on next page
Calculation Table 2: Length of luff extrusion
Example
(Navtec -8)
with
rigging screw
50% extended
1310 mm
(51 1/2”)
•
•
–
•
–
•
–
•
•
•
•
•
1310 mm
(51 1/2”)
•
•
•
–
•
–
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
–
•
Rod diameter
OYS
(Riggarna)
BSI
With
rigg.
screw
Without
rigg.
screw
Navtec
With
rigg.
screw
1310 mm
(51 1/2”)
1340 mm
(52 3/4”)
1290 mm
(50 3/4”)
1290 mm
(50 3/4”)
1290 mm
(50 3/4”)
Without
rigg.
screw
1320 mm
(52”)
1270 mm
(50”)
1320 mm
(52”)
1270 mm
(50”)
1320 mm
(52”)
1270 mm
(50”)
–
–
1400 mm
(55 1/8”)
1340 mm
(52 3/4”)
–
–
1400 mm
(55 1/8”)
1400 mm
(55 1/8”)
1340 mm
(52 3/4”)
1340 mm
(52 3/4”)
1340 mm
(52 3/4”)
1340 mm
(52 3/4”)
1340 mm
(52 3/4”)
1290 mm
(50 3/4”)
1340 mm
(52 3/4”)
1340 mm
(52 3/4”)
1410 mm
(55 1/2”)
1410 mm
(55 1/2”)
1340 mm
(52 3/4”)
1410 mm
(55 1/2”)
1340 mm
(52 3/4”)
1410 mm
(55 1/2”)
1340 mm
(52 3/4”)
1450 mm
(57”)
1395 mm
(55”)
1395 mm
(55”)
1395 mm
(55”)
1310 mm
(51 1/2”)
1450 mm
(57”)
1340 mm
(52 3/4”)
1470 mm
(58”)
1380 mm
(54 1/2”)
1470 mm
(58”)
1380 mm
(54 1/2”)
1395 mm
(55”)
-40 (ø 12,7 mm)
-48 (ø 14,3 mm)
500 S
-15 (ø 7,5 mm)
-12 (ø 7,1 mm)
-22 (ø 9,5 mm)
-17 (ø 8,4 mm)
-8 (ø 5,7 mm)
400 S
-10 (ø 6,4 mm)
-12 (ø 7,1 mm)
-15 (ø 7,5 mm)
-40 (ø 12,7 mm)
-30 (ø 11,1 mm)