Re: Irwin 10/4 centerboard info
I believe the 10-4 drew on east coast catboats for its basic hull design philosophy. That would make the centerboard pretty essential.
Ted Irwin is still living in Florida AFAIK
- maybe try contacting him.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.