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