This technology goes by many names: cyclogyro, cyclorotor, cyclocopter, cycloidal rotor, among others.
It is quite an old concept, originating from the early 20th century, but today research is still being performed on it, most notably by the University of Maryland and Seoul National University.
The reasons I believe why they are not commonly used today:
-Complicated control mechanisms
-High centrifugal loads and necessity of weak orientation of blades to resist these loads
-Poor forward flight performance (although there are some people researching this)
You can find quite a few videos on YouTube showing cyclorotors in action. This is one of my favorites done by students at Seoul National University.
It is quite an old concept, originating from the early 20th century, but today research is still being performed on it, most notably by the University of Maryland and Seoul National University.
The reasons I believe why they are not commonly used today:
-Complicated control mechanisms
-High centrifugal loads and necessity of weak orientation of blades to resist these loads
-Poor forward flight performance (although there are some people researching this)
You can find quite a few videos on YouTube showing cyclorotors in action. This is one of my favorites done by students at Seoul National University.