topendtorque
you have got to be having a serious lend of everyone with that "concept" drawing, or "concept" photoshop.
Never, never
No joke. It was serious. ~ seriously
It it was a Blokow concept similar to the Bolkow P-310 concept. Both of which had Interleaving configurations.
The large 40-degree lead-lag decreases the airspeed differential between the leading and trailing blades during high speed flight.
They were based on the Bolkow Bo-46
Boelkow Bo-46 helicopter - development history, photos, technical data
Bölkow Bo 46 - Wikipedia, the free encyclopedia
Worldwide Rotorcraft Website: Unusual Rotorcraft - Bolkow 46 Pics
Dave