Hi bevel450, I've posted your request over on ducatisti.co.uk to see if any of the gurus over there can help: http://www.ducatisti.co.uk/forum/technical-help/36302-80s-experimental-suspension.html#post381108
CDONA, you're thinking of the Tesi, which has seen several incarnations:
To the best of my knowledge, no. But funny that you should mention Ribi, as one of our engineers is a push bike junky and is completing a four seat trail bike ( he, his wife, and two daughters 6 and 5...all with individual cranks !) and he developed a four bar link which got me to thinking about Ducatis experience with the design.Do you mean a RIBI front suspension. Itailian 1983. Suzuki and Can-Am used them on dirtbikes. Some mountain bikes have them now. And the BMW front end is a derivative of it.
I'm interested in what you find...To the best of my knowledge, no. But funny that you should mention Ribi, as one of our engineers is a push bike junky and is completing a four seat trail bike ( he, his wife, and two daughters 6 and 5...all with individual cranks !) and he developed a four bar link which got me to thinking about Ducatis experience with the design.
Mick Walker, in his Two-Valve Twins Ducati book, provided one picture of an experimental front end like you're describing.