હેલિકોપ્ટર: આવૃત્તિઓ વચ્ચેનો તફાવત

Content deleted Content added
No edit summary
લીટી ૪૩:
{{refend}}
 
== બાહરી સૂત્ર ==
{{commonscat|Helicopters}}
* [http://www.vtol.org American Helicopter Society]
* [http://www.quad-a.org/ Army Aviation Association of America]
* [http://www.helicopterlinks.com Helicopter Links - companies, organizations, museums, trade/air shows]
* {{HSW}}
* [http://www.rotor.com/ Helicopter Association International]
* [http://www.helis.com/ Helicopter history site]
* [http://www.helicopterphotos.net Helicopter photo gallery]
* [http://www.rotaryaction.com Rotary Action - guide to helicopters in movies and TV]
* [http://patimg2.uspto.gov/.piw?Docid=01848389&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO1%2526Sect2%3DHITOFF%2526d%3DPALL%2526p%3D1%2526u%3D%25252Fnetahtml%25252FPTO%25252Fsrchnum.htm%2526r%3D1%2526f%3DG%2526l%3D50%2526s1%3D1848389.PN.%2526OS%3DPN%2F1848389%2526RS%3DPN%2F1848389&PageNum=&Rtype=&SectionNum=&idkey=NONE&Input=View+first+pageUS US patent #1848389 - Sikorsky's helicopter patent (requires Quicktime plugin)].
* [http://www.archive.org/details/Helicopt1953 1953 archive video about uses and flight physics of helicopters], (features vintage models). Published by Encyclopaedia Brittanica but now Creative Commons license, Prelinger Archives.
* 1918 Popular Science article on various imagined and suggested helicopter design concepts - ''Flights -- of the Imagination: airships that soar only in the day-dreams of their inventors'', [[Popular Science]] monthly, December 1918, page 58-59, Scanned by Google Books: http://books.google.com/books?id=EikDAAAAMBAJ&pg=PA58 <!-- Hidden tracking categories -->
 
[[શ્રેણી:Articles with citations to Popular Science archive]]
[[શ્રેણી:Articles with verifiable citations via Google Books]]
[[શ્રેણી:હૈલીકૉપ્ટર]]
[[શ્રેણી:વાયુયાન]]
[[શ્રેણી:યાંત્રિક પ્રૌદ્યોગિકી]]
[[શ્રેણી:વૈમાનિક અભિયાન્ત્રિકી]]
 
{{Link FA|vi}}