Exp US coaxial rotor collection

[rousseau]

I knew there must be some, but I can't post more. Waiting for your contribution

 

[GTX]

Well there was the Sikorsky S-69 / XH-59. See http://avia.russian.ee/helicopters_eng/sik_s-69.php for more info.

Regards,

Greg

 

[Hanse]

The original 350 mph chopper

 

[Sundog]

It's successor is at this link

 

[mil]

Here are some photos of Sikorsky S-69 are rare.

 

[mil]

others on this site are http://commons.wikimedia.org/wiki/Category:Sikorsky_S-69 large volume and I can not reduce them to expose