Are these aircraft actually Gyro Dynes?
During forward, high speed flight, the main rotor of the X-3 is significantly unloaded when compared to a helicopter in cruise flight where both lift and forward thrust is provided by the main rotor. Some of the X-3’s weight is supported by wing lift generated by the wing structure that supports the propellers. The remaining lift is provided by the main rotor in an autorotative state. This is also evident in X-3 high speed forward flight videos where you can see the actual angle of the main rotor disk tilt. The X-3’s the rotor disk tilted slightly aft in forward flight. Similarly, Sikorky’s X-59 and X-2 helicopters torque to main rotor drops to near zero in high seep flight thus becoming a gyro dyne. Gyro dyne is probably the correct designation for these new aircraft.