Hello Folks
Built my 1st gyro using the net as a guildline, fuselage is built radio installed and pylon is all done. Using Elevator for pitch rudder as normal. Lateral control uses tilt on rotor head but the only thing im not sure about is the flapping hindges on the blade root. Everybody seems to use very flexible material on small models but what about the larger ones can the hindge be too flexible, what materials are more commonly used an to what degree does the rotor (flap).

Model is electric powered weight 3 ilbs rotor diameter 46'' 3 blades (photos to follow)
Im aware of 20deg up stop but looking at some photos at pheonex autogyros the plate doesnt look like it would flex at all.

Reading artiilcles it seems the rotor has to have this in built flexibily because of advancing blade into the airflow or the model will roll into the retreating blade uncontrolabley, is there a formulea for calculating the needed flexibility of the root hindges or is guessing as good as it gets



[&o]


Thanks in advance Len

Hi Len, I would contact the folks at Flying Balsa; they make the PT 25 model, and sell the flex plate head for it. Maybe they could advise you of the size/thickness/construction for a 3 lb. gyroplane. Their email address is : www.flyingbalsa.com Hope this info helps. Charlie Anderson

Thank you very much good sir much appreciated