With a bow thruster, you greatly increase maneuverability. It is also becoming increasingly popular with stern thrusters in combination with bow thrusters, in order to be able to turn the boat around its own axis. How should I design bow and stern propellers for my boat? 

Each bow thruster gives a certain power to the boat, but in order to obtain the optimum characteristics. It is important that the bow thruster is dimensioned to provide sufficient compressive force in all conditions of the boat. It may be wise to consider a more powerful bow thruster for those using their boat in more demanding conditions, than the average user.

Image Source: Google

The effect of the bow thruster in the boat is mainly determined by the boat's wind catch and not by the weight of the boat, which is a general view. When we know the total wind area of the boat, the turning point of the boat and the location of the tunnel. 

We can calculate the wind force against the boat's hull side. Based on this calculation we can determine how much compressive force is needed to turn the bow up against the wind at a special wind force.

For example – when calculating on a 45-foot boat, there are four bow thrusters to choose from, in the so-called standard range. If the boat has a small windscreen and is only used under the best conditions with little wind, you can choose a Side-Power SE80.