Lynn:
Welcome to the forum. Although I've had my boat for over 5 years I can't say it is the original rudder. I had some issues with my rudder a few years ago and took it to a man who restores Lyman boats (wooden power boats). According to him, my rudder is made of Phillipine mahogany. His suggestions worked well and the rudder is still in operation. I'll be glad to take measurements of mine and possibly some photos if it will help. Don't count on finding Phillipine mahogany without paying big bucks. I checked with several boatyards and lumberyards around the Lake Erie area without any success. An Amish lumberyard nearby has indicated that they could craft one out of a different wood but no price was discussed. Good sailing!
Dick