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Choosing the right SidePower thruster for your boat.
Every boat operator can benefit from having a thruster
installed on their boat.
In principle, any thruster will do a job in any boat. However,
the key to getting the full benefits of the thruster is to select the correct
one to ensure that it will do the job you want it to. This is one of two main
factors to consider when deciding on a thruster size for your boat.
Today most pleasure craft over 45’ have a bow
thruster as standard equipment. The thruster will usually meet the expectations
of most customers when using the boat under normal weather conditions. The sizes
used by boatbuilders will vary depending on the boat’s intended usage and price
level. In today’s production boats of around 45’-50’, the typical thruster will
push the boat’s bow against a direct sidewind of 20-22 knots.
Some custom built or very high end boats may
have a high power bow thruster that pushes the bow against a direct sidewind of
24-26 knots. For boatowners who use their boats in more demanding conditions or
have a strong current in their local marina, or requiring high performance,
boatbuilders can offer
upgrades to a more powerful thruster system. However, few pleasure craft need a
thruster that can push the bow against a direct sidewind of more than 25-27
knots.
The thruster’s performance on a boat is
basically determined by the boat’s wind area, the wind area distribution and the
thruster’s tunnel position in the hull. By knowing these factors we can
calculate the wind pressure on the boat and the center point of this wind
pressure. From these calculations we can determine what thrust is needed to
counter the wind pressure with the given thruster position. The boat weight is
normally not a major factor for most pleasure craft unless they are regularly
used in areas where the thruster is required counter strong currents.
Conclusion
The two main factors that decide correct thruster sizing are:
- boatowner performance requirements
- boat size, type and shape
The example below shows
the different wind speeds that two different thruster installations can
encounter and the increased leverage gained when the thruster is positioned
further forward.
The charts below give general guidelines to help in selecting a
thruster for your boat. We do offer a more involved thruster calculation
process for determining the correct model for your boat. If you would like to
contact us to request further details, please feel free to do so.
Electric bow- and
stern thrusters.
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