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Airplanes use a lot of fuel, which means a lot of CO2 emissions. So, to help reduce the impact of aviation, engineers are looking to animals (like sharks) for some ways they can make airliners more efficient.
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Sources:
https://www.pbs.org/wgbh/nova/teachers/activities/pdf/3203_concorde_02.pdf
https://theicct.org/sites/default/files/publications/ICCT_CO2-commercl-aviation-2018_20190918.pdf
https://www.researchgate.net/publication/46380838_Shark-Skin_Surfaces_for_Fluid-Drag_Reduction_in_Turbulent_Flow_A_Review
https://www.sciencedirect.com/science/article/pii/S1352231020305689#fig3
https://ourworldindata.org/co2-emissions-from-aviation
https://ocean.si.edu/ocean-life/sharks-rays/biomimicry-shark-denticles
https://www.lufthansa-technik.com/aeroshark
https://www.nature.com/articles/srep08853
https://faculty.weber.edu/rmeyers/meyers-albatross.pdf
https://www.airbus.com/en/innovation/disruptive-concepts/biomimicry/albatrossone
http://www.aerospaceweb.org/question/aerodynamics/vortex/trailing-vortex.jpg
https://ntts-prod.s3.amazonaws.com/t2p/prod/t2media/tops/pdf/DRC-TOPS-22.pdf
https://www.airbus.com/en/innovation/disruptive-concepts/biomimicry/fellofly
https://flipbook.mms-airbus.com/fellofly/index.html#/page/6
https://www.airbus.com/en/newsroom/stories/2020-09-how-a-fellofly-flight-will-actually-work
Images:
https://www.gettyimages.com/detail/video/airplane-takes-off-and-climb-stock-footage/623004994?adppopup=true
https://www.gettyimages.com/detail/video/the-plane-takes-off-from-the-runway-stock-footage/1339783925?adppopup=true
https://commons.wikimedia.org/wiki/File:United_Boeing_737_at_SFO.jpg
https://www.gettyimages.com/detail/video/jumbo-jet-above-the-clouds-with-sun-stock-footage/544500362?adppopup=true
https://www.gettyimages.com/detail/video/black-tip-reef-shark-swimming-close-up-on-coral-reef-phi-stock-footage/689743056?adppopup=true
https://commons.wikimedia.org/wiki/File:Denticules_cutans_du_requin_citron_Negaprion_brevirostris_vus_au_microscope_lectronique__balayage.jpg
https://commons.wikimedia.org/wiki/File:Delta_wings_vortex.png
https://www.gettyimages.com/detail/video/albatross-soaring-through-blue-sky-seabird-in-flight-stock-footage/472650523?adppopup=true
https://www.gettyimages.com/detail/photo/the-wandering-albatross-is-a-large-seabird-from-the-royalty-free-image/1208029907?adppopup=true
https://commons.wikimedia.org/wiki/File:FlightSilhouettes.svg
https://www.gettyimages.com/detail/video/black-browed-albatross-flying-low-stock-footage/1127470280?adppopup=true
https://commons.wikimedia.org/wiki/File:777X_Roll-Out_(40407369583).jpg
https://commons.wikimedia.org/wiki/File:777X_Roll-Out_FoldingWingtip.jpg
https://www.gettyimages.com/detail/video/flock-of-wild-grey-geese-in-flight-migration-stock-footage/1141745794?adppopup=true
https://www.gettyimages.com/detail/photo/the-turbulence-of-the-clouds-left-by-the-plane-royalty-free-image/1125702712?adppopup=true
https://www.gettyimages.com/detail/video/flying-over-clouds-amid-the-blue-sky-on-the-plane-view-stock-footage/1222932949?adppopup=true
https://www.gettyimages.com/detail/video/migrators-stock-footage/520626662?adppopup=true
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