Windmill Class Association

:: I have 2 plywood paddel foot plywood ruder blanks not
:: shaped. free to good home you pay shiping or pick up at
:: a regatta.

Please excuse my ignorance, but what is a rudder blank? We have a windmill that needs a rudder. We were thinking about building one and I was perusing the site for a design or a used one and saw your post. Would this get us on the way to building a rudder? I Andrea