Reply To: Rudder Profile
Please correct me if I am reading the rules incorrectly but as far as I know:
The cross section of the blade can be what you want – there is nothing controlling how far from the edge you can shape the blade. The profile must be to the outline in the rules plus or minus 5mm. I don’t think there is any gain to be made here by pushing the tolerances – I try to make them to the outline and then the tolerance is there for its purpose- allowing you a bit of shaping room.
The underwater bit must be 20mm thick or less and the angle and profile on the rudder all relates to the underwater shape when fitted to the boat.
You can use metal or other generally prohibited materials on the edges purely to protect the edge from damage. I don’t think there is a distance from the edge rule but you can’t push it and try to say that the carbon fibre you have put on the front and back 50mm wide is just to protect the edge. Nobody seems to feel this is even worth pursuing – I wouldn’t bother.
I usually (like others) put some filled epoxy on the bottom front edge to make it easier to mend if you bash it and prevent the water from getting in.
There is a lot of discussion about the front edge shape. I prefer a finer entry but some people like the front more bulbous. I would concentrate on making the whole issue as easy to push through the water as possible.
Hope this helps,