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Author Topic: Some old Helicopters and Converiplanes Patents  (Read 1489 times)

Offline hesham

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Some old Helicopters and Converiplanes Patents
« on: May 14, 2015, 09:06:45 am »
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

Offline hesham

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Re: Some old Helicopters and Converiplanes Patents
« Reply #1 on: May 14, 2015, 09:09:45 am »
And;

Offline hesham

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Re: Some old Helicopters and Converiplanes Patents
« Reply #2 on: May 14, 2015, 09:10:28 am »
And;

Offline hesham

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Re: Some old Helicopters and Converiplanes Patents
« Reply #3 on: September 08, 2017, 08:18:53 am »
Hi,

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



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