Sikorsky HLH (?) drawings

[flateric]

Found at Worthpoint actually, erroneously referred as S-71

 

[JohnR]

What was the dates for the S-71?

 

[Apophenia]

What was the dates for the S-71?

The S-71 gunship was proposed in 1973.

https://www.sikorskyarchives.com/S-71 AAH.php
The Heavy Lift Helicopter competition emerged in 1970 with Sikorsky submitting its unsuccessful S-73 concept in February 1971.

https://www.sikorskyarchives.com/HLH Heavy Lift Helicopter.php