Dynamic stall should be considered in time, not angle

[lucasschn]

Dynamic stall angle for r>0.05 is not well defined because maximum in CC occurs when the ramp has already stopped growing (alpha=30°).

However, we could look at the time elapsed between the passage of static stall angle and the max in CC.

[lucasschn]

There are two definitions of t_ds, from t0 or from t=0.

[lucasschn]

The time elapsed between static and dynamic stall angles follows a consistent decay with the pitch rate.

[lucasschn]

Now we should investigate how this related to the value of Tp and Tf. These constants should be tuned manually for all these cases.