For boats that cannot fit a tunnel thruster or do not wish to have an external thruster under the boat, then a retractable thruster is the solution.
There are three versions of the retractable thruster, one model designed for direct mould-in, and two designed to be mounted on a flange. The flange can be a mould-in base from Side-Power, or boat builders can manufacture their own base in materials suited for their hulls or as part of their basic hull design.
The flange mounted models have a thruster unit in a casing that will be bolted to a base. This allows for easier installation in hulls made from different materials, as well as in series production where you do not want to mix laminating and engineering type jobs.
Retractable Thrusters also come in PRO versions - combined with the DC Speed Control system - to achieve variable speed control over thruster operations and perfect control over the thrust.