I am with
spinwing on this.
No real info & the French did it years ago
Link to one on Ebay in AUS
http://cgi.ebay.com.au/DJIN-HELICOPT...ayphotohosting
A slight worry is the wooden mast and gutter bolt blade retention system, but it is a 50s design so what do I know.
scroll to top of advert a lot of info\history on type.