How would you design a cyclocopter?

[OCPatch]

Hey Nick, Jude, or anyone else:
What do the Cl vs. alpha and Cd vs. alpha curves look like during the dynamic stall phenomenon? I get that it is a transient condition at best, but it must predictably happen with every revolution of a cyclorotor blade if you guys are getting best thrust at 35 or even 45 degrees incidence wrt the blade path.

 

[Gabik09]

Hey Nick, Jude, or anyone else:
What do the Cl vs. alpha and Cd vs. alpha curves look like during the dynamic stall phenomenon? I get that it is a transient condition at best, but it must predictably happen with every revolution of a cyclorotor blade if you guys are getting best thrust at 35 or even 45 degrees incidence wrt the blade path.

Hey! During dynamic stall, the Cl vs. alpha curve typically shows a sharp drop after a peak lift coefficient as the flow separates and the stall begins. It often leads to a sharp decrease in lift and a significant increase in drag. The Cd vs. alpha curve will show a sharp rise in drag at high angles of attack, reflecting the increased flow separation and turbulence.

For cyclorotors, if the blade is reaching such high incidences (35-45 degrees), you'd expect these dynamics to occur every revolution, with periodic stall and recovery. This transient behavior is what makes achieving high thrust at these angles a bit tricky, but also why dynamic stall is crucial to the performance at certain RPMs.