Hi Lizard !!! Congratulations !!! I was very happy to see the pix of your successful 2-bladed gyroplane !! I am going to start working on perfecting my 2-bladed teeter head. Your head was interesting because you used individually hinged flapping blades. I think the problems you were having on spinup were caused by the blades drooping below the hub. If you modified the hub so that the blades were always even with the hub (straight across at rest), but could rise above the hub to seek their level, spinup might be easier. Also, thicker and wider blades may help, in order to gain more blade area (solidity factor) and lift. Keep up the good work, and don't give up the development of the two-blader !! Your success is an inspiration to others !!! Happy Flying !!! Charlie Anderson