Dehn Ringwing annular airplane circa 1982

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take a look
http://members.cox.net/twitt/dehnring.htm

 

[Vahe Demirjian]

take a look
http://members.cox.net/twitt/dehnring.htm

There's an updated version of the weblink regarding the Dehn Ringwing annular airplane:

http://www.twitt.org/dehnring.htm
Plans were made for a motorized version of this aircraft, but never materialized.