We suffered a dangerous rudder post failure on e27 #91 during the Round the Rocks Race this past Saturday. Sailing upwind in moderate breeze and small chop. I have posted some photos under the gallery "Rudder Post Failure". Appears to be a failure of a welded or brazed joint between the rudder post cap and tube. Thankfully the rudder is buoyant so we did not lose it, it floated within the guide tube until we got back to the dock under tow. I assume this design is common within the fleet so I urge you to inspect this joint to prevent additional failures in the fleet.