/sci/ - Science & Math

So I am working on building my own roll stabilizers for my boat (displacement). A few naval architecture books recommend using a Naca 0010 profile for control surfaces as it offers decent lift at speeds under 18 knots without offering too much added drag. I've been looking at some of the graphs for this profile ant the stall angle is around 5 deg.

What is confusing me is that the critical angle of attack is usually around 15 deg still. Does this just mean I'm getting a bunch of layer separation/turbulence around the stall angle? And that as I move away from the stall angle things become less turbulent until I hit my critical AoA again? The foil would more than likely be operating in the 3 to 10 deg range most of the time, and I don't want it to be stalling out during that time.

I guess my question is how can the stall angle be less than the angle of attack? And past that, do any naval architects or aero engineers agree with the Naca 0010 recomendation? My vessel's working speed is 8 knots, and from the dimensions I want to use for the foil an Re of 500k-1000k.

So I am working on building my own roll stabilizers for my boat (displacement). A few naval architecture books recommend using a Naca 0010 profile for control surfaces as it offers decent lift at speeds under 18 knots without offering too much added drag. I've been looking at some of the graphs for this profile ant the stall angle is around 5 deg.

What is confusing me is that the critical angle of attack is usually around 15 deg still. Does this just mean I'm getting a bunch of layer separation/turbulence around the stall angle? And that as I move away from the stall angle things become less turbulent until I hit my critical AoA again? The foil would more than likely be operating in the 3 to 10 deg range most of the time, and I don't want it to be stalling out during that time.

I guess my question is how can the stall angle be less than the angle of attack? And past that, do any naval architects or aero engineers agree with the Naca 0010 recomendation? My vessel's working speed is 8 knots, and from the dimensions I want to use for the foil an Re of 500k-1000k.