This co-axial rotor homebuilt helicopter was built by Bodo Franke during the late '50s, but, as far
as known, never flown. The 3-view was shown in Aero, May 1958, with the hint, that it was first
published in the French "Aviation Magazine". Mor information can be found here: https://sites.google.com/site/stingrayslistofrotorcraft/bodo-franke-frankocopter
65.000 DM? A quick search tells me that the average German yearly income in 1958 was 5330 DM. That is a lot of money for a flying box of questionable safety.
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