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Spinosaurus may have used its dorsal fin as a courtship display.
Ship stabilising fins reduce roll.
In some Asian countries shark fins are a culinary delicacy.
In recent years, car fins have evolved into highly functional spoilers and wings.
Cavitation damage is evident on this propeller.
Compressor fins
Cetaceans get thrust moving horizontal tail fins up and down.
Ailerons control roll.
Fish get thrust moving vertical tail fins from side to side.
Stingrays get thrust from large pectoral fins.
The dorsal fin of a white shark contain dermal fibers that work "like riggings that stabilize a ship's mast", and stiffen dynamically as the shark swims faster to control roll and yaw.
During courtship, the female cichlid, Pelvicachromis taeniatus, displays her visually arresting purple pelvic fin.
A rudder corrects yaw.
Flying fish use enlarged pectoral fins to glide above the surface of the water.
Oil heaters convect with fins.
Motorbikes use fins to cool the engine.
Ship propeller
A fin keel limits roll and sideways drift.
Fletching on an arrow
The rudder controls yaw.
Surfboard fins allow surfers to maneuver their boards.
Conventional "planar" fins on a RIM-7 Sea Sparrow missile
Frog fish use their pectoral and pelvic fins to walk along the ocean bottom.
Airplane propeller
Swim fins add thrust to the kicks of a human swimmer.
Fish, boats and airplanes need control of three degrees of rotational freedom.
Sailfish raise their dorsal fin to cool down or to herd schooling fish.
Elevators control pitch.
Asymmetric stabilizing fins impart spin to this Soviet artillery rocket
Many reef fish have pectoral and pelvic fins optimised for flattened bodies.
Thunnus obesus diagram cropped.GIF
Southern right whale caudal fin-2 no sky.JPG
White shark .jpg
Barb gonio 080525 9610 ltn Cf.jpg
Jetfins reglables.jpg
Pelvicachromis taeniatus.jpg
Aileron roll.gif
Stern of Bro Elisabeth 2.jpg
Antennarius striatus.jpg
Shark finning icon.jpg
Yacht keel steer.svg
Cavitation Propeller Damage.JPG
Dasyatis thetidis.jpg
Holacanthus ciliaris 1.jpg
Oil Heater 5293.jpg
Fernando Alonso won 2012 Malaysian GP.jpg
Spinosaurus 2020 reconstruction.jpg
Aileron yaw.gif
Sailfin flyingfish.jpg
Aileron pitch.gif
Rescue surfboard, Killahoey Strand - geograph.org.uk - 901180.jpg
Yacht keel.svg
AquaPenguin – Festo, YouTube
Robotic Fish YouTube
Robot Fish YouTube
Evolution of the Surfboard Fin – YouTube
Charlie the catfish – CIA video
AiraCuda – Festo, YouTube
AquaRay – Festo, YouTube
AquaJelly – Festo, YouTube
Robotic Shark YouTube
Robotic fish to monitor pollution in harbours YouTube
Aristotle recognised the distinction between analogous and homologous structures, and made the following prophetic comparison: "Birds in a way resemble fishes. For birds have their wings in the upper part of their bodies and fishes have two fins in the front part of their bodies. Birds have feet on their underpart and most fishes have a second pair of fins in their under-part and near their front fins."
– Aristotle, De incessu animalium
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September 2017
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Specialised fins are used to control motion
Fins can regulate temperature
Static tail fins are used as stabilizers
Ornamentation
Moving fins can provide thrust
Other uses
thin component or appendage attached to a larger body or structure
поверхня для керування польотом
tunn komponent eller bihang fäst till en större kropp eller struktur av aerodynamiska skäl
componente delgado o apéndice unido a un cuerpo o estructura más grande
algemeen