  Choice of spar section is critical to
performance. Material, size, wall thickness, weight and shape affect both static bending
characteristics and dynamic characteristics ("gust response").
We design our sections to take class rules to the limit: - for
example the Olympus boom section was designed to be simply the stiffest 470 boom possible
within class rules, while the Vectis exploits the Snipe minimum mast weight to give a low
windage, responsive mast section.
Whatever your class, the extensive Proctor section range ensures
that there is a mast and boom available with optimum performance. For recommendations for
your particular class, please consult our specific class data sheet.
2003
Seldén Boom Bracket & Boom End Fittings
|
Section |
Sectional
Weight kg/m |
Dimension
(mm) fore/aft |
Dimension
(mm) athw |
Stiffness
fore/aft |
Stiffness
athw |
|
Dinghy Mast Sections |
 |
2420 |
0.78 |
61 |
50 |
10 |
7.5 |
 |
Electron |
1.00 |
61 |
66 |
11 |
18 |
 |
Lambda |
0.86 |
63 |
51 |
13 |
10 |
 |
C |
0.90 |
65 |
54 |
14 |
10 |
 |
Vectis |
1.02 |
59 |
51 |
15.5 |
11 |
 |
Kappa |
0.91 |
67 |
55 |
16.5 |
12 |
 |
E |
1.17 |
70 |
54 |
19 |
14 |
 |
D |
0.97 |
73 |
57 |
19.5 |
12 |
 |
Cumulus |
0.95 |
69 |
58 |
19.5 |
14 |
 |
D Plus |
1.03 |
73 |
57 |
19.5 |
14 |
 |
Stratus |
0.98 |
69 |
57 |
19.5 |
15 |
 |
Epsilon |
1.02 |
72 |
57 |
20 |
15.5 |
 |
Nimbus |
1.16 |
68 |
54 |
20 |
15.5 |
 |
Jet |
1.10 |
76 |
65 |
26 |
17 |
 |
Gamma |
1.15 |
75 |
56 |
27 |
16 |
 |
Cirrus |
1.20 |
75 |
65 |
28 |
20 |
 |
F |
1.35 |
78 |
60 |
30 |
20 |
|
Dayboat
Sections |
 |
3525 |
1.40 |
90 |
64 |
43 |
29 |
 |
3929 |
1.60 |
91 |
74 |
53 |
35 |
 |
4028 |
1.90 |
102 |
71 |
83 |
38 |
 |
4529 |
2.20 |
114 |
74 |
115 |
50 |
 |
4931 |
2.30 |
124 |
79 |
133 |
58 |
 |
5034 |
2.40 |
127 |
86 |
162 |
83 |
 |
5641 |
3.10 |
142 |
104 |
241 |
129 |
|
|
|
|
|
|
|
Boom
Sections |
 |
2520 |
1.06 |
63 |
53 |
20 |
11 |
 |
2628 |
1.00 |
72 |
63 |
26 |
16 |
 |
Olympus |
1.02 |
72 |
66 |
29 |
17 |
 |
2229 |
1.05 |
75 |
55 |
30 |
14 |
 |
2633 |
1.06 |
85 |
66 |
40 |
18 |
 |
2632 |
1.50 |
84 |
66 |
53 |
24 |
 |
120 |
2.12 |
120 |
62 |
160 |
43 |
Proctor "basic" masts and fittings
Alpha & Beta Dinghy masts |
