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Preliminary Research and Documentation





Figure 1 - Underwater portion of the SWATH chassis design.




Ballast Tanks

The chassis is designed to hold 2 sets of ballast tanks, one set at the front of each hull and one set at the back of each hull. These ballast tanks are connected to 2 water pumps that can fill or empty the ballasts when needed. The ballast tanks must be full at all times to keep the SWATH stable. 


Figure 2 - Ballast tanks and hull.

Foam Liner Compartment 

The foam liner compartment is a layer of foam under the belly of the SWATH concept car. The foam liner compartment ensures that the SWATH does not sink even if it is filled with water.


Rudders and Tail

Rudders are small boat-shaped rudders that can turn clockwise and counterclockwise.


Figure 3 - Side view of a rudder



Figure 4- Top view of a rudder

Placing Rudders and Tail

A set of 4 rudders are placed at the front of each hull. A pair of tails are placed at the rear of each hull.


Figure 5 - Bottom view of the hull with rudders and tail



Figure 6 - Side view of a hull with rudders

Each rudder has a connector rod that is placed perpendicularly to the central axis of the rudder. The connector rod is then connected to a control rod that connects all the rudders together.


Figure 7 - Top view of the connector and control rods



Figure 7 - Side view of the connector and control rods



Figure 8 - Front view of the rudder, connector and control rods



The tail is a boat shaped structure that is placed at the rear of the hull away from the ballast tank. The tail is fixed and cannot turn. It keeps the craft stable and easy to maneuver. 


Rudder Movement

Each rudder is fixed to the base of the hull and can turn clockwise and counterclockwise. This turning action is controlled by the control rod. The control rod can move forward and backwards, there by turning the angle of the rudders. Control rods from each hull are controlled by the central steering system.

If the control rod moves forward, the rudders turn counterclockwise.


Figure 9 - Counterclockwise movement of the rudders.


When the control rod moves backwards, the rudders turn clockwise.


Figure 10 - Clockwise movement of the rudders.


Thruster Panel

A thruster panel is designed to hold 4 rim-driven thrusters. Each thruster is controlled independently from the navigation console. It is placed between the 2 hulls and housed in the chassis. The depth of the thruster panel can be adjusted from the navigation console. 


Figure 11 - Thruster panel


Helm (Steering Control) System

The steering control system consists of a steering wheel that centrally connects to a propeller shaft. The propeller shaft connects to the axle shaft. 


Figure 12 - Complete movement and operational control system.

Turning the steering wheel clockwise or counterclockwise turns the direction of the rudders. 



Figure 13 - Clockwise and counterclockwise movement of the steering wheel.

The movement of the rudder is controlled by installing gear wheels on the propeller and axle shafts.


Additional Components

The following are additional components that need to be installed:

  •  Movement sensor (9 axis accelerometer)
  • Water level sensor in buoyancy tanks
  • Water level sensor of the vessel relative to the ocean
  • Water/air temperature sensor - Optional
  • Additional sensors - Optional
  • The vessel should be able to connect via API to the Ocean Builders web server when in range of the internet (specific APIs to be determined later) - BONUS





This project is being developed as an open-source project with the following licensing: