Depending upon the drag, viscosity, blade shape and flow characteristic of the fluid, the critical angle varies for different rudder and fluid combination.
For marine rudder and water, the critical angle happens to be around 35° . From the going, it is well understood that as the rudder reaches it's critical angle of 35°, then instead of changing direction of the vessel, it will slow down the vessel, which is undesirable.
At the end of discussion, make a note that critical angle is synonymous to stall angle. Thus if someone says that rudder reaches stall angle, it means that rudder reaches its critical angle.
For marine rudder and water, the critical angle happens to be around 35° . From the going, it is well understood that as the rudder reaches it's critical angle of 35°, then instead of changing direction of the vessel, it will slow down the vessel, which is undesirable.
At the end of discussion, make a note that critical angle is synonymous to stall angle. Thus if someone says that rudder reaches stall angle, it means that rudder reaches its critical angle.
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