“Without diving equipment it would remain a professional activity. The diver or the diver with ARO heavy trim, slaves of walking to get around, they would never have attracted the attention of the sports world. Simple, small footprint, cost reasonable and what is more joy to “fly” in the water, that’s what they offer equipment “Fins for example contributed to the spread of submarine life no less mask. They have transformed the laborious progress of underwater breaststroke in an easy motion, fluid, restful. Without them, the dive would lose a very considerable part of the attraction she exercised over fans. ”
This Duilio Marcante wrote in his” go down with me underwater “diving manual written by him and George Odaglia.
Just these words give a ‘idea of what scuba equipment, in their evolution, have influenced and made possible the development of diving.
And, taking a cue from this, we will speak of the fins, those wonderful tools, which are nothing, if not the leg extension and the diver’s feet.
Nowadays the types of fins there are a huge amount and any good diver, when he has to buy some a couple, has its beautiful fish to fry.
However we begin the discussion by saying that the fins are primarily differentiated into two large families, those fit to closed or slipper and the open fit with straps.
Looking at the first type we will say that is the most suitable for snorkeling and apnea. The foot enters the fin and is completely bandaged from the shoe that keeps it tight.
The second type instead includes those fins which are used for diving with ARA, the shoe, or in some cases the boot, is open in the back and the foot is stopped from the belts. They can be worn with shoes provided with the sole of the boots or dry suits.
The size change with reference to the destination uses.
For freediving fins will have the size also considerable length. This is to boost the pressure of the same fins.
For scuba diving fins will be a medium-sized blade, if not reduced the order to ensure greater mobility within obstructed environments. Nothing however prohibits that the long fins apnea can also be used in diving “scuba.”
As regards the construction materials, nowadays are in principle two. The plastics or natural rubber. This applies to the blades, while the shoes are appropriate that they are always made of natural rubber. Other material used for the construction of apnea fins, is the carbon fiber, good compromise between lightness and mechanical properties (elasticity, resistance etc.) Which thus allow to have equal if not greater pushing power with a weight and then a fatigue of the lower legs.
it is therefore clear that the construction of the blade material will directly affect the thrust power, it is known that the plastic damage to the fin of a much greater thrust potential that no natural rubber, but they last much less and are easier to damaged.
Caution, the fins may have a structure both negative and positive, while those rubber will have a trim undoubtedly negative, those in other materials, may be the one and the other. Keep in mind this feature, because, in diving is compromising use fins that have a positive thrust.
Some houses have entered, in the blades of their fins, different materials which enabled a further increase thrust without too much strain on the leg , such as they are the mythical forwards4 of Mares.
it must be said that, in most cases, to a greater thrust of the fin, corresponds to a greater fatigue of the leg. In simpler words a powerful fin requires more training.
A separate discussion deserves the fins between last generation which we find the Twin series of Scubapro and Force Fin. Their shapes are not without doubt traditional, the former have bilobali blades, that is to say that the blades in halves are separated by a cut that allows the modification of the geometry of the blades themselves. The Force Fin, built in pure polyurethane, derive their design from the caudal fins of some pelagic fish.
Other fins like Jetfin Scubapro and Techfin of DiveSystem, even if they are advertised as new, are nothing but reproductions of old models fins. In fact, at one time, the fins were all more or less the shape of the above two models, short and wide blade.
A novelty however is the type of spring strap. In short, rather than rubber, the strap retainer is constitued by a stainless steel spring covered with neoprene, large indestructibility benefits, longevity, big disadvantage some difficulty in the process of fit and fashion show of the fins, especially in boots of dry suits.