Sleipner VECTOR FINS VF650, Installation Manual, Page: 10 / 68

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SPS-B
MC_0207
Hull Forces
All calculated values are normalised, determined by equilibrium considerations and also that various coeffi cients are inaccurate as hull design etc will
affect the actual fi n effect.
Dynamic effects such as jumps/impacts with waves, back flow closing of valve etc could further increase the hull/shaft loads. Therefore all
dimensioning should account for this by using a safety factor.
The aft top face of the fi n is deliberately made weaker than the rest of the fi n so it will break easier in case of an impact with the hull.
It is advised to strengthen the hull or ensure it is manufactured with materials suitable to sustaining impacts over the total length of the fi n within an
area of approximately 10 degrees of fi n rotation in each direction from its centre.
(NB: This is a safety measure to ensure the fi n will not break through the hull in a collision situation.)
Sleipner curved Vector Fin design comes with additional benefi ts in hull safety. Any impact with the ground will not only bend the shaft backwards and
outward, allowing the fi n to break away with less stress on the hull.
MG_0213
Bending moment
(Mx and My
components)
Shear force
(FX and Fy
components)
Axial shaft
force (fz)
Torque
moment (Mz)
Outer surface
hull
SPS55
FIN LOADS ON HULL
Fin size Speed Bending moment
(Mx+My)
Twisting
torque
(Mz)
Axial shaft
(Fz)
Shear force
(Fx+Fy)
Shaft break -
away
SPS55
VF 650
10 kn / Min 3500 Nm 2100 Nm 3200 N 9500 N 230 kN
15 kn 4700 Nm 2700 Nm 5300 N 10800 N 230 kN
20 kn 5600 Nm 2700 Nm 6400 N 11800 N 230 kN
25 kn 6400 Nm 2700 Nm 7300 N 12700 N 230 kN
30 kn 6600 Nm 2700 Nm 7800 N 15000 N 230 kN
35 kn 6600 Nm 2700 Nm 7800 N 18000 N 230 kN
40 kn 6600 Nm 2700 Nm 7800 N 18000 N 230 kN
SPS55
VF 800
10 kn / Min 4400 Nm 2700 Nm 4000 N 9300 N 230 kN
15 kn 5000 Nm 2700 Nm 5200 N 10000 N 230 kN
20 kn 6200 Nm 2700 Nm 6300 N 10500 N 230 kN
25 kn 7100 Nm 2700 Nm 7300 N 12100 N 230 kN
30 kn 7300 Nm 2700 Nm 7800 N 14000 N 230 kN
35 kn 7300 Nm 2700 Nm 7800 N 19000 N 230 kN
40 kn 7300 Nm 2700 Nm 7800 N 19000 N 230 kN