Politecnico di Torino - Corso Duca degli Abruzzi, 24 - 10129 Torino, ITALY

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Planing hull with gas insufflation for a water motor

Compression plantExhaust gasGas insufflationPlaning hullSurface friction


The current ventilated hulls reduce consumption and improve the performance of ships and boats thanks to a reduction in viscous resistance. However, the complex air compression and distribution system does not always equal the benefits generated, which is why, although they have existed for long time, they are not widely used today.

The invention exploits the natural depressions under planing hulls to convey and distribute the engine gases in order to improve the hydrodynamic performance of hulls and hydrofoils. In particular, it allows the hulls to reduce the viscosity of the vehicle, using gas bubbles or layers of gas coming from the exhaust gases of the engines.

In this way it is possible simplify the system with better performance.

Before being sent into water, the exhaust gas can be treated with systems such as cooling, pressure compensation or pressure increase and can be mixed with air or other gases or nebulized liquids to increase the flow rate or efficiency.

It should be highlighted that the engine gases, for this type of vehicle, are in any case disposed of in water, which is why the invention entails a considerable environmental advantage with a reduction of up to 30% in emissions.

Technical features

A planing hull for insufflation of the engine gas into water is described, comprising an apparatus of main engines (1), an outlet pipe of the exhaust gas (2), an exhaust gas cooling system (3), a safety valve (4), a compensation vessel (5), a plurality of nozzles (6) and a surface portion of the hull a contact with exhaust gases (7). A controller (10) with two cascaded PID control loops is connected to the cooling apparatus of the exhaust gases (3) and the compensation tank (5). The controller (10) is adapted to determine a control signal applied to the shock absorber (51) to control a pressure (P5) downstream of the compensation case (5).

Possible Applications

  • Shipbuilding industry;
  • Hulls or hydrofoils;
  • Nautical transport;
  • Sustainable mobility.


  • Reduction of consumption and improvement of the performance of the vehicle;
  • Simplification of the ventilation system and consequent savings in construction and management costs;
  • Reduction or elimination of energy costs of compression;
  • Reduction of weight and dimensions on board the compression system;
  • Lower environmental impact.