9
A
E
200
C
B
D
WL
T
2.4 Top extrusions - length calculation
The Furlex luff extrusion consists of a number of shorter pieces. Starting from the bottom there is a 1000 mm
luff extrusion connected to the drum unit and extending up to the sail feeder. Then, from the sail feeder and up
there are a number of full length luff extrusions (L=2400 mm) and finally there is a top extrusion that has to be
cut to length to suite the actual forestay length.
Note! If the calculation gives a top extrusion length (D) that is shorter than 400 mm, the
calculation must be reworked by exchanging one of the 2400 mm (94 1/2”) extrusions with
the uncut 2000 mm (78 47/64”) top extrusion. By doing so the top extrusion will be cut from
a 2400 mm length and its length will then exceed 400 mm (15 3/4”). If the calculation gives
a top extrusion length (D) that exceedes 2000 mm (78 47/64), the top extrusion must be cut
from one of the 2400 mm (94 1/2”) extrusions. In this case the 2000 mm (78 47/64) extrusion
will not be used.
Fig. 2.4.a
FL
= existing for
estay length
