Boom sections choice Which boom section is the right choice for my yacht? To select the correct boom section, you will need to know
the sail foot length (E) and righting moment (RM).
If the RM is not known, displacement is an alternative. Depending on boom length, sheet attachment points and rig type, you look up the appropriate boom section
in the tables below. The E and Y measurements must be known for dimen-sioning purposes. The lenght of the boom is sometimes
determined by other factors than E and therefore we need
the S measurement aswell. A good example is when the
boom extrusion needs an overlength to allow the main
sheet to pass a sprayhood.

Y

max

S E

max

Masthead rigs, E

max

and Y

max

(m) Fractional rigs, E

max

and Y

max

(m)

RM 86/59 120/62 135/71 152/82 171/94 200/117 250/140 300/155 E RM 86/59 120/62 135/71 152/82 171/94 200/117 250/140 300/155 E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

E

max

Y

max

6 3.8 1.5 4.1 2.1 8 3.8 1.3 4.1 1.8 4.8 2.5
10 3.2 1.2 4.1 1.6 4.8 2.2
12 2.8 1.1 4.1 1.5 4.8 2.0 5.6 2.9
14 2.5 1.0 4.1 1.4 4.8 1.9 5.6 2.7
16 4.1 1.3 4.8 1.8 5.6 2.5 6.1 3.3
18 4.1 1.2 4.8 1.7 5.6 2.4 6.1 3.1
20 3.8 1.1 4.8 1.6 5.6 2.3 6.1 3.0
25 3.3 1.0 4.8 1.4 5.6 2.0 6.1 2.7
30 2.9 0.9 4.5 1.3 5.6 1.9 6.1 2.4 6.6 3.7
35 2.6 0.9 4.0 1.2 5.6 1.7 6.1 2.3 6.6 3.4
40 3.7 1.1 5.1 1.6 6.1 2.1 6.6 3.2
45 3.4 1.1 4.7 1.5 6.1 2.0 6.6 3.0
50 3.2 1.0 4.4 1.4 6.1 1.9 6.6 2.8
55 4.1 1.4 6.1 1.8 6.6 2.7
60 3.9 1.3 5.7 1.7 6.6 2.6
70 3.5 1.2 5.1 1.6 6.6 2.4 7.2 3.7
80 3.2 1.1 4.7 1.5 6.6 2.2 7.2 3.5
90 2.9 1.1 4.3 1.4 6.5 2.1 7.2 3.3
100 2.7 1.0 4.0 1.3 6.0 2.0 7.2 3.1
110 3.7 1.3 5.7 1.9 7.2 3.0
120 3.5 1.2 5.3 1.8 7.2 2.8 8.3 4.1
130 3.3 1.2 5.0 1.8 7.2 2.7 8.3 3.9
140 3.2 1.1 4.8 1.7 7.2 2.6 8.3 3.8
150 4.6 1.6 7.2 2.5 8.3 3.7
160 4.4 1.6 7.2 2.5 8.3 3.5
170 4.2 1.5 6.9 2.4 8.3 3.4
180 4.0 1.5 6.6 2.3 8.3 3.3
190 3.9 1.5 6.4 2.3 8.3 3.2
200 3.7 1.4 6.1 2.2 8.3 3.2
210 5.9 2.1 8.3 3.1
220 5.7 2.1 8.3 3.0
230 5.6 2.1 8.3 2.9
240 5.4 2.0 8.3 2.9
250 5.2 5.2 8.3 8.4 6 3.8 1.3 4.1 1.8 8 3.1 1.1 4.1 1.6 4.8 2.1
10 2.7 1.0 4.1 1.4 4.8 1.9
12 2.4 0.9 4.1 1.3 4.8 1.8
14 4.1 1.2 4.8 1.6 5.6 2.3
16 3.7 1.1 4.8 1.5 5.6 2.1
18 3.4 1.0 4.8 1.4 5.6 2.1 6.1 2.7
20 3.2 1.0 4.8 1.4 5.6 2.0 6.1 2.6
25 2.7 0.9 4.3 1.2 5.6 1.7 6.1 2.3 6.6 3.4 30 3.8 1.1 5.2 1.6 6.1 2.1 6.6 3.1 35 3.4 1.0 4.7 1.5 6.1 1.9 6.6 2.9
40 3.1 1.0 4.3 1.4 6.1 1.8 6.6 2.7
45 3.9 1.3 5.8 1.7 6.6 2.6
50 3.7 1.2 5.4 1.6 6.6 2.4
55 3.4 1.2 5.1 1.5 6.6 2.3 7.2 3.6
60 3.2 1.1 4.8 1.5 6.6 2.2 7.2 3.5
70 2.9 1.0 4.3 1.4 6.5 2.1 7.2 3.2
80 3.9 1.3 5.9 1.9 7.2 3.0
90 3.6 1.2 5.4 1.8 7.2 2.8
100 3.3 1.1 5.0 1.7 7.2 2.7 8.3 3.9
110 3.1 1.1 4.7 1.6 7.2 2.6 8.3 3.7
120 4.4 1.6 7.2 2.4 8.3 3.5
130 4.2 1.5 6.9 2.3 8.3 3.4
140 4.0 1.5 6.6 2.3 8.3 3.3
150 3.8 1.4 6.2 2.2 8.3 3.1
160 3.6 1.4 6.0 2.1 8.3 3.0
170 3.5 1.3 5.7 2.1 8.3 3.0
180 3.3 1.3 5.5 2.0 8.3 2.9
190 3.2 1.3 5.3 1.9 8.3 2.8
200 5.1 1.9 8.2 2.7
210 4.9 1.8 7.9 2.7
220 4.8 1.8 7.7 2.6
230 4.6 1.8 7.4 2.5
240 4.5 1.7 7.2 2.5
250 4.4 1.7 7.0 2.4

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