With the Morgan 24, I got tired of having the spinnaker up with the tiller under my chin & no control because the rudder had stalled. Redid the rudder from a 10% section up to an 18% section with much better stall properties. I used a section with a lower drag 'bucket' at smaller angles of attack. Don't recall the section offhand, but if someone's interested I'll look in my files. As I recall, I was quite pleased with the change.