Delta rotor hub plates.
Rich, & Phil, Thanks for the response...........I currently fly giant scale aircraft with US Engines. In the recent past I watched a dual rotor gyro fly (demo) at a warbird flyin...It was facinating to see it loop and both rotors actually stopped!!!!!!!!! I am now suffering the ITCH to build a new aircraft...the thought of a gyro has sure got me thinking.....Does any one know of a plan that would be suitable to blow up for a 25 - 35 cc gas engine?? Any help would be appreciated.