Originally Posted by mydauphin
Guys, I know you geniuses can figure out this simple question. See the rudder in my previous post in this thread. What is rudder surface area? What is percentage of area in front of axis for balance and behind for main area? Also for what size boat would this rudder work? It is for planning boat like a sportfisherman but is it for 30 footer, 40 footer, 50 footer, etc...?
Thanks again, and you geniuses dont let me down.
I don't really get the meaning of that "you genuises", but since I don't like thinking negatively I'll take it in a most affable sense... We're probably short of geniuses here, they've been all taken by the Microsoft and are designing blue screens now.
As about your rudder over there, this is what I can tell you:
- the total area is 3.92 sq. feet
- the compensation area (area in front of the stock) is 0.98 sq. feet.
- the compensation area is therefore 17% of the total rudder area, which makes it quite suitable for a fast cruisers, semidisplacement or planing type. It's probably less suitable for slow cruisers, which may require as much as 25% of compensation area.
- an old rule of thumb says that, for twin rudders, the total rudder area should be 3-4% of boat's lateral plane area (which is basicaly the lateral projection of the underwater body). So the rudder you have is suitable for a boat with a lateral plane area of about 100-130 sq. feet (in a single rudder configuration) or about double that value (200-260 sq.feet) for twin rudder installation.
Hope that will help.
A (kitchen) Genius