Multi-motored Airplanes, 1933

Bibliography:

Information from the following sources was used in the compilation of these webpages. We encourage you to consult these works to broaden your knowledge of Sikorsky and his accomplishments.

Sikorsky Archives News: http://www.sikorskyarchives.com

Helicopter History Site: http://www.helis.com/introduction/prin.php

Air Transportation: The Pioneering Years: Commercial Aviation 1920-1930: http://www.centennialofflight.gov/essay/Commercial_Aviation/1920s/Tran1.htm

Principles of rotary flight: http://www.helis.com/howflies/prflight.php

Aerospaceweb.org | Helicopter Theory - Early History: http://www.aerospaceweb.org/design/helicopter/history.shtml

AmeericanHeritage.com | STRAIGHT UP: http://www.americanheritage.com/articles/magazine/it/1993/3/1993_3_26.shtml

Nat' Academies Press, Memorial Tributes: National Academy of Engineering Vol. 1 (1979): http://www.nap.edu/catalog/578.html

Sikorsky: Our History: http://www.sikorsky.com/details/0,3036,CLI1_DIV69_ETI683,00.html

St. Petersburg: through centuries - My father's fate: http://www.300.years.spb.ru/eng/3_spb_3.html?id=24