A report on Fin and Swimfin

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Full foot fins
Fins are used by aquatic animals, such as this orca, to generate thrust and control the subsequent motion
By 1974, modern-looking swimfins in regular use in landlocked, “second-world” Hungary.
Caudal fin of a great white shark
1959 Soviet postage stamp with image of finned recreational diver in tribute to DOSAAF sport organisation.
Aquatic animals typically use fins for locomotion (1) pectoral fins (paired), (2) pelvic fins (paired), (3) dorsal fin, (4) adipose fin, (5) anal fin, (6) caudal (tail) fin
Swim fin sole showing compliance with German standard DIN 7876:1980
Comparison between A) the swimming fin of a lobe-finned fish and B) the walking leg of a tetrapod. Bones considered to correspond with each other have the same color.
An assortment of fins in a diving shop. Fins on the right are full foot and those in the middle are open heel.
In a parallel but independent evolution, the ancient reptile Ichthyosaurus communis developed fins (or flippers) very similar to fish (or dolphins)
Monofin and pair of freediving bifins
In the 1990s the CIA built a robotic catfish called Charlie to test the feasibility of unmanned underwater vehicles
An open-heel vented paddle Jetfin
Underwater divers using paddle fins
Fin design intended to reduce fatigue
Swimfins designed for swim training.
Swimfins designed for bodyboarding or bodysurfing.
Swim fin strap attachment with simple rubber strap and wire buckle
Swim fin strap attachment with swivelling plastic buckle and clip
Aftermarket stainless steel spring fin strap attached with long D-shackles for security
Open heel fin with stainless steel spring strap with rubber padding
Fin with bungee strap
Figures 1-3: Fin grips before and after fitting.
Figures 4-7: How fin grips are fitted on full-foot swimming fins.
Two pairs of early fin grips: Beuchat Fixe-Palmes and Mares Fissapinne
Underwater hockey fins with yellow and red pairs of fin grips.
A fin grip positioned to secure a full-foot swimming fin on the foot.

Swimfins, swim fins, diving fins, or flippers are finlike accessories worn on the feet, legs or hands and made from rubber, plastic, carbon fiber or combinations of these materials, to aid movement through the water in water sports activities such as swimming, bodyboarding, bodysurfing, float-tube fishing, kneeboarding, riverboarding, scuba diving, snorkeling, spearfishing, underwater hockey, underwater rugby and various other types of underwater diving.

- Swimfin

Reshaping human feet with swim fins, rather like the tail fin of a fish, add thrust and efficiency to the kicks of a swimmer or underwater diver Surfboard fins provide surfers with means to maneuver and control their boards.

- Fin
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