Hello Ciervapilot....

Yes you are right, JoJo built (I believe) the first Synchrogyro. A fellow in Oregon also built a synchronized three-bladed (total of six blades) interleaved configuration that flew very well. I'm not sure if Emilio has built and flown that type. He may see your posting and reply.

For us non-initiated could you let us know what is a flettner rotor autogyro???

Thanks
BillF