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Delta Prototypes

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Zakaz pływania łodziami motorowymi
 Water vehicles using a classic propeller are subject to substantial reductions in the overall hydrodynamic efficiency. This is due to high head resistance of the propeller and the energy losses arising from the cavitating separation of fluid jet from the propeller blades. In vessel drives used these days, considerable amount of energy generated by the engine is lost completely! So called cavitation is responsible for that, a phenomenon which occurs due to local pressure variations resulting from fast rotation of the propeller. The pressure drops cause the liquid to boil and form gas bubbles. A standard propeller, therefore, operates always in a water-gas mixture, losing huge amounts of energy. In addition to that, on leaving the propeller operating zone, gas bubbles collapse rapidly generating shock waves. Therefore, cavitation is one of the major sources of noise, which poses a problem, for example in case of submarines.

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Delta Prototypes research program means:

Low fuel consumption
Lower water transport costs

Reduction in exhaust fumes discharge
Less environmental pollution

High efficiency, whatever the direction of vessel motion
A safer water transport

Low cavitation coefficient
Quiet operation

Harmless to water fauna and flora
Access to nature reserves

Technology

 Watercrafts using standard propeller screw are subject to considerable limitations of overall hydrodynamic efficiency. This is due to a high head resistance of the propeller and energy losses caused by the cavity. These limitations will not be overcome until a new generation driver is introduced. Delta Prototypes is currently working on such a solution.

 The application of solutions occurring in nature is a modern trend in structural design of machinery. The development of a new propeller family was inspired by the observation of the swimming technique of cephalopods. The outcome of this research is an innovative wave propulsion system, which significantly reduces energy loss in the drive of a watercraft. As demonstrated by prototype tests, the patented propelling technology can seriously reduce the fuel consumption of a watercraft compared to currently used solutions.


PROTOTYPE HYDRODYNAMIC PERFORMANCE
Kalmar propulsion hydrodynamic performance


LEGEND:


Watercraft velocity coefficient V/L
V - Unit velocity [m/s]
L - Total unit length [m]

Unit power coefficient N/G
N - Power consumed by the drive [W]
G - Watercraft weight [Kg]



Diagram based on data from the KALMAR 2
prototype tests on water.





 Such diagrams are used for cross-comparison of hydrodynamic efficiency of watercrafts. For the sake of comparison, the diagram includes positions occupied by contemporary vehicles with screw propellers (the submarine symbol) and representatives of marine fauna, including the dolphin, whose manner of movement has so far been an unattainable ideal for designers in terms of energy efficiency. There is a general rule saying that the more vertical the line between the (0,0) point and the point of watercraft performance, the more closer the vehicle to perfection in terms of energy efficiency.
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