Intellectual property nº A-2910
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The internal dynamics represent the organization of all forces, internal as well as external,
that influence the vehicles: the creative control of the horizonal and vertical gravity forces, in het eigentijdspunt in het interaktie tussen en in de materie van stabiliteit in beweging

The designers J.W. Griffites en A. J. Gielens, both in their own period, 19th en 21st century, create "The Rainbow" and "Breaking", the most revolutionary and fastest marine craft of their time.


- speed

- behaviour

- technical data

- testing

- licence

- research


300 km/h.


The vehicles possess a number of extraordinary qualities, such as: 

- an aggressive and extensive manoeuvrability.
- the speed, right from the start and even while turning.Yet the vehicles can be stopped very rapidly. 
- perfect control in all manoeuvres.
- safety and reliability.
- absolute stability at stand still and in operation.
- little maintenance and no need for specialized personnel, because the vehicles are very easy to repair.
- the vehicles are hardly subject to external influences like wind and waves, neither at high speed, nor during short turns.

Compared with similar crafts such as helicopters,  they have a great action radius. In extreme weather conditions, they will not be hampered in their movements.

Technical Data:

  • Width : 3.00 m
  • Length : 3.60 m
  • Engines : two Rotax 377 or König engines, one turning clockwise, the other counter clockwise 
  • Power : 35 hp per engine at 5500 R.P.M
  • Pressure: 2 x 70 kgs: 140 kgs static
  • Propellors: 0.76 m diameter
  • Weight (with engines): ±120 kgs + 70 kgs (pilot)
  • Maximum resistance: 38 kgs at 25 km/h 

  • Testing:


  • The executed works of optimization of the industrial prototype.
  • Determination of possible future works, their nature and the prospected duration of each of these phases.

  • Besides the guiding know-how given by the owner of the patent during the optimization process of the industrial prototype, a synergy with a third person is possible concerning the additional analytical studies, eventually as proposed by engineers Dirk de Vis, Jef Vandenhout and Johan Zeischka from Louvain Measurement Systems, L.M.S.

    The model laws will also have to be applied.

    An analytical study explains the working principle of the Shark:
  • 1. Analysis of the acting forces.
  • 2. Evaluation of the aerodynamic forces.
  • 3. Evaluation of the hydrodynamic forces.
  • 4. Evaluation of the equilibrium of the forces.
  • In view of the optimization of the industrial prototype, the following analytical studies may be considered:
    - An aerodynamic, resp. hydrodynamic analysis showing the forces that will influence the vehicle.

    By means of an inertia tensor in a simulation programme, an analysis can be made and a structural analysis can sustain the crafts´ integrity.

    Technical analysis and executed analysis:


    Executed in March-April 1987.

  • Testing of the engines
  • Testing of the pressure power
  • Testing of the safety
  • Testing of the equilibrium spot
  • Testing of the steering elements
  • Testing of the principal foundations and arms of support
  • Testing of the vibrations
  • Testing of the load
  • Testing of the electronic steering


    A.) Executed in April 1985 at limited speed 15 Km/h - 45 Km/h.

  • Testing of the waterline and stability of the wing
  • Testing of the resistance
  • Testing of the steerability manoeuvrability

  • B.) Executed in May - June 1987 At low speed. 
  • Testing of the hydrodynamics
  • Testing of the resistance
  • Testing of the internal dynamics
  • Testing of the steerability
  • Testing of the stability 

  • C.) Executed in July-August 1987 At medium-high speeds. 
  • Testing of the resistance
  • Testing of the hydrodynamics
  • Testing of the aerodynamics
  • Testing of the ground-effect
  • Testing of the equilibrium point
  • Testing of the stability
  • Testing of the steerability
  • Testing of the wash of the waves
    D.) Executed in August-September 1987 At high speed 70-100 Km/h and 210-300 Km/h. 
  • Testing of the resistance
  • Testing of the pressure power
  • Testing of the aerodynamics
  • Testing of the internal dynamics
  • Testing of the safety
  • Testing of the ground-effect
  • Testing of the centrifugal forces
  • Testing of the stability
  • Testing of the wash of the waves
  • Testing of the breaks
  • Testing of the mechanical parts and joints
  • Testing of the vibrations
  • Testing of the external forces 
  • Testing of the engines under extreme situations
  • Testing of the pressure power
  • Complete fracture testing
  • Learning to steer the vehicle in all phases


    1. Construction of the body (wing and fin) (executed)
  • pre construction in wood
  • moulding of wing and fin
  • moulding of the cabin
  • wing in polyester, fin and arms in composite materials
  • 2. Adapting the engines, so that one turns clockwise and the other counterclockwise.
    3. Mounting of the fuel tanks
    4. Construction of the cabin with pilot seat.
    5. Installation of the electric wiring and batteries.
    6. Mounting of the board instruments.
    7. Mounting of the control column and the electronic parts.
    8. Construction of the basis for the engines.
    9. Inserting and installing of the engines.
    10. Testing of:
  • the behaviour at low speeds
  • the behaviour at high speeds
  • the stability
  • the manoeuvrability
  • safety
  • maximum wavelength and height
  • maximum speed

  • Test data:
    The SHARK design and prototype were thoroughly tested and examined by an independent study bureau (LMS) and its integrity confirmed by an appreciation report by the University of Ghent.


    Shark in the scaffolding


    The skin of the Shark and the other hydroskimmers has got a crenated surface, spread, dependant on the necessity and the size of the craft, from the border of attack, over the upper side. This transforms the phenomenon of turbulence into a laminar fluid.

    A model on scale of the SHARK has been tried with succes and a video shows its behaviour. After having seen this video, one can conclude that the transition from inoperative state to flowing state takes place in a very soft way. There is no instability that would require the not wanted interaction of the pilot, even when the angle of attack is very small. The modell on scale presents a high grade of manoeuvrability at high and low speeds. 
  • Ing. Dirk de vis
  • Ing. John Zeischka
  • - 5 June 1989

    Those interviewed were selected because of their knowledge of the naval industry. All persons without exception were strongly impressed by the vehicle's stability and manoeuvrability. They were also surprised by the undoubted speed and its capacity of stopping, which is higher than in any known vehicle. 
    All agreed that the SHARK is the the most innovative craft that has been seen since long.
  • Guy Dixon - Marine Consultant England

  • Evaluation of the qualities of the vehicle in operation.
    It may be said that the design of the vehicle is based on very sound principles of flow mechanics.We are convinced that this vehicle provides very high qualities of stability, manoeuvrability and agility.
  • Prof. Ing. H. Somerling - Rijksuniversiteit Gent

  • A structural analysis confirms the integrity of the design. To be mentioned also the report by Rijksuniversiteit Gent, who acted as consultants on flow theory. On the whole, this report confirms our opinion.
  • Ing. Jef Vandenhout. Director - Louvain Measurements Systems

  • As they move in ground-effect, they cause little wake and swell. At the same time they are low enough to execute unobtrusive manoeuvres.
    - other vehicles that need to be observed can be reached easily.
    - during rescue operations it is possible to stand on the wing without capsizing.
    - quick mooring and easy stepping in and out.
    - during repairs of other objects, the wing lies low in the water and can serve as a platform.

    In comparison to wings and air-cushion vehicles:
    They can be steered much better and with more precision, higher speed, more reliability and more operational possibilities. They are not hampered by extreme weather conditions. They are much more economical in construction and consumption.

    In general,
    the dynamic stability wigs are very economical and require no costly maintenance personnel, especially for the mechanical and engine parts. Consequently, possible defects or failures during operation can be repaired quickly by the crew. Their production cost is low, even for small series.

    On account of their particular way of operating, their extremely high cruising speed, their exceptional manoeuvrability, flexibility and safety, these vehicles offer possibilities hitherto unknown.

    Market combination:
    The vehicles can be adapted:
    - as a vehicle for more passengers
    - as a vehicle for freight transport
    The use of the ground-effect offers enhanced loading capacity without hampering the great action radius, the stability, manoeuvrability and the rapid execution of operations.

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