A position and the trim next to the peak performance buoyance are basic elements that each diver must have mastered in a very good degree. There are several positions, but the trim is only one.
In this mysterious concept lies the ability of such settings of the ballast that you can relatively easily keep the figure horizontally – during moving and in a situation when we want to stop. The ideal solution is to achieve a stable balance (the centre of gravity lies slightly below the centre of buoyancy) but it is extremely difficult to achieve. Mostly divers reach an unstable balance (the centre of gravity is above the centre of buoyancy). Maintaining the proper trim helps to maintain the desired position.
The issue of the position is easier to understand – the idea is to make it the most streamlined, because then the least energy is consumed. This can be compared with cycling – the more horizontal figure, the less air resistance. The same thing happens when diving – depending on the adopted position, the resistance of water is bigger or smaller.
A horizontal position
It generates the least front resistance. By swimming in such a position we consume the least energy. The best way to overcome long distances. Unfortunately it has some shortcomings – not for everyone is comfortable. Why? By somewhat limited visibility and the ability of moving body upright “on the head”.
An angle position
The slope of the body at a slight angle (10-20 degrees) slightly increases the resistance of water, but for many divers it is the optimal position, because the more comfortable swimming – the better visibility, the natural body position. The more angle increases, the more energy you have to put in movement (an example shown in the picture). A big angle may be indicative of a low skilled diver.
A vertical position
It is allowed only at the beginning of the immersion and at the end of the emersion. All the work of the flippers “goes in” maintaining the buoyancy.