VGR - Variable Geometry Rails
The water rails, invented by C4 in 1994, play the role to control, canalising it, the water on the blade. They make the swim with fins stable, the fin moves as led on two rails; the performances are enhanced by the total lack of 'derapage' effect.
In plain breath-held diving, where the performance is executed in controlled conditions, in quiet waters, in a straight path with constant charges, the performance is obtained with the matching of least energy consumption and highest speed.
The requirements for fishing are different, because an easy handling, a sudden spring and variable charges, due both to fishing needs and changing sea weather conditions, are required.
Therefore the main thing requested to fins is their adaptability to the changing work conditions to which they are subjected. As we know, the improvement of performance is always reached by adjusting in specific way the features of the tool, to the action needs.
Changing needs require modifications in the equipment. Only one thing good for all means to be satisfied with common performances and this is not our philosophy.
The water rails VGR (Variable Geometry Rails) let in a new concept in the system of control on the amount of water worked by fins. By them the canalisation of water flows is progressively modified according to the area and the fold of the blade, improving the performances.
We know that, owing to the move led by the foot on the fins, the speed of water running on the blade is increased, passing from the foot to the blade end. It is this that provokes the propulsory push of the fins. With the water rails VGR, water amounts worked are progressively modified, following the speed changes of this in the progressive sections of the blade.
A further advantage given by the water rails VGR is they take at work a special shape of the “L” sections, strongly reducing the rips between the layer of moving water on the blades, in comparison with the static one of the sea.
The water amount worked by the water rails changes according to their dimensions. Low water rails work little water, if high they work more.
With the same conditions of materials, surfaces and applied energy, more is the worked water, stronger is the push. It is for this that long blades pushes more than short ones, because they work more water.
With the same conditions, the worked water becomes the one controlled by the water rails, that are useful the largest possible, to work the maximum of water, this consistently with the elastic response of materials, hardness, geometries and dimensions of the fins. Task of the designer is to amalgamate materials, stresses and dimensions to get low consumptions of oxygen and high speeds.
Therefore the water rails VGR have the largest possible dimensions for each section of the fins, to make the maximum possible quick the worked water amounts.
What is useful, where and when it is useful, it is so that higher speeds and energy saving are obtained, as it is with the water rails VGR.
At the dive store, scubastore, you can find different sizes of C4 VGR Water Rail and in the different colors . In addition, you can also complete your order with products related with C4 VGR Water Rail or the category Fins from our online dive store. Read our expert advice guides about dive equipment and also the C4 VGR Water Rail reviews.