[RichH]

As regards the rudder, with a stress analysis and strength of materials background and having owned both keel hung (barn door) and balanced spade rudders, it is my engineering opinion (and without going into the mathematics of force multiplication of levers, etc.) the barn door type is very vulnerable especially when the boat is travelling in reverse during a hove-to mode. The spade, especially if balanced, would not see such extreme forces in reverse when held at a hove-to attitude. A barn door rudder stock and hing system because of such reverse flow vulnerability HAS to be built much stronger. .... which should intuitively tell you something. ;-)