Heimildir

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IAMTECHNICAL 2018, sótt þann 15 maí af https://www.iamtechnical.com/how-aerofoil-creates-uplift-aircraft

Smithsonian National Air And Space Museum (ekkert ártal) sótt þann 16 maí af https://airandspace.si.edu/exhibitions/wright-brothers/online/fly/1903/construction.cfm

Wikipedia 2018, sótt þann 21 maí af https://en.wikipedia.org/wiki/Avro_504

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Wikipedia 2018, sótt þann 21 maí af https://en.wikipedia.org/wiki/Fokker_Dr.I

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Wikipedia 2018, sótt 16 maí 2018 af https://en.wikipedia.org/wiki/Avro_504

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Wikipedia 2018, sótt 28 maí 2018 af https://en.wikipedia.org/wiki/Anthony_Fokker

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Sandersaeronautics 2016, sótt 30 maí 2018 https://www.sandersaeronautics.com/restoration_beech-h18-mcmillan.asp

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Sandersaeronautics 2016, sótt 30 maí 2018 af https://www.sandersaeronautics.com/restoration_beech-h18-mcmillan.asp

John2031 2013, sótt 30 maí 2018 af     https://www.john2031.com/twin_beech_18/18d/pictures_and_information.html

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https://www.tangmere-museum.org.uk/aircraft-month/avro-504

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Wikipedia 2018, sótt 31 maí 2018 af 

https://en.wikipedia.org/wiki/Tupolev_Tu-95

Wikipedia 2018, sótt 31 maí 2018 af

https://en.wikipedia.org/wiki/Douglas_XB-42_Mixmaster

Wikipedia 2018, sótt 31 maí 2018 af 

https://en.wikipedia.org/wiki/Contra-rotating_propellers

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https://marinewiki.org/index.php/Contra-rotating_Propellers