10 6461 22022
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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_0284
Bending moment
(Mx and My
components)
Shear force
(FX and Fy
components)
Axial shaft
force (fz)
Torque
moment (Mz)
Outer surface
hull
MC_0253
Fin Loads on Hull
Fin size Speed Bending
moment
(Mx+My)
Twisting
torque
(Mz)
Axial
shaft
(Fz)
Shear
force
(Fx+Fy)
Shaft
breakaway
SPS66/67
VF1050
10 kn 5500 Nm 3400 Nm 5000 N 10200 N 350 kN
15 kn 6500 Nm 3400 Nm 6000 N 11200 N 350 kN
20 kn 8200 Nm 3400 Nm 7300 N 12200 N 350 kN
25 kn 9600 Nm 3400 Nm 8600 N 14200 N 350 kN
30 kn 10000 Nm 3400 Nm 9000 N 15500 N 350 kN
35 kn 10000 Nm 3400 Nm 9000 N 23300 N 350 kN
40 kn 10000 Nm 3400 Nm 9000 N 23300 N 350 kN
SPS92
VF1350
10 kn /
Min
10500 Nm 7000 Nm 6500 N 19000 N 940 kN
15 kn 12500 Nm 7000 Nm 10000 N 20000 N 940 kN
20 kn 15000 Nm 7000 Nm 12000 N 21000 N 940 kN
25 kn 17500 Nm 7000 Nm 13700 N 22500 N 940 kN
30 kn 18000 Nm 7000 Nm 14600 N 27500 N 940 kN
35 kn 18000 Nm 7000 Nm 14600 N 35000 N 940 kN
40 kn 18000 Nm 7000 Nm 14600 N 35000 N 940 kN
SPS93
VF1650
10 kn /
Min
11500 Nm 7000 Nm 8000 N 18000 N 940 kN
15 kn 13500 Nm 7000 Nm 10500 N 19000 N 940 kN
20 kn 17500 Nm 7000 Nm 12500 N 21000 N 940 kN
25 kn 20000 Nm 7000 Nm 14500 N 23000 N 940 kN
30 kn 20500 Nm 7000 Nm 15000 N 28000 N 940 kN
35 kn 20500 Nm 7000 Nm 15000 N 38000 N 940 kN
40 kn 20500 Nm 7000 Nm 15000 N 38000 N 940 kN
Fin size Speed Bending
moment
(Mx+My)
Twisting
torque
(Mz)
Axial
shaft
(Fz)
Shear
force
(Fx+Fy)
Shaft
breakaway
SPS95B
VFS1950
22%
SHAFT
POSI-
TION
10 kn /
Min
7800 Nm 7800 Nm 3800 N 18000 N 940 kN
15 kn 12600 Nm 7800 Nm 8500 N 31000 N 940 kN
20 kn 14600 Nm 7800 Nm 10600 N 34000 N 940 kN
25 kn 15100 Nm 7800 Nm 16500 N 37000 N 940 kN
30 kn 17000 Nm 7800 Nm 18200 N 41500 N 940 kN
35 kn 18350 Nm 7800 Nm 24800 N 43500 N 940 kN
40 kn 20000 Nm 7800 Nm 32000 N 47000 N 940 kN
SPS95B
VFS1950
26%
SHAFT
POSI-
TION
10 kn /
Min
7600 Nm 7800 Nm 3800 N 18000 N 940 kN
15 kn 16000 Nm 7800 Nm 8500 N 40000 N 940 kN
20 kn 19600 Nm 7800 Nm 10600 N 49000 N 940 kN
25 kn 20200 Nm 7800 Nm 16500 N 50488 N 940 kN
30 kn 22700 Nm 7800 Nm 18200 N 57000 N 940 kN
35 kn 24300 Nm 7800 Nm 24800 N 60000 N 940 kN
40 kn 26300 Nm 7800 Nm 32000 N 64200 N 940 kN
SPS95B
VFS1950
30%
SHAFT
POSI-
TION
10 kn /
Min
7500 Nm 7800 Nm 3800 N 18000 N 940 kN
15 kn 17000 Nm 7800 Nm 8500 N 40000 N 940 kN
20 kn 28600 Nm 7800 Nm 10600 N 64000 N 940 kN
25 kn 31700 Nm 7800 Nm 16500 N 81000 N 940 kN
30 kn 35900 Nm 7800 Nm 18200 N 92000 N 940 kN
35 kn 38200 Nm 7800 Nm 24800 N 99000 N 940 kN
40 kn 41100 Nm 7800 Nm 32000 N 105000 N 940 kN
Maximum 30 knots top speed for SPS55 / VF1050 combination
