Some old Helicopters and Converiplanes Patents

hesham

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Hi,


from the same report about Lockheed Model-286,there is some old helicopters and convertiplanes
patents;


http://www.dtic.mil/dtic/tr/fulltext/u2/731493.pdf
 

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And;
 

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And;
 

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Hi,

here is a strange helicopter,had a tilt rotor,designed by Mr. Avery Harold in 1943;



https://encrypted.google.com/patents/US2468913
 

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