Catalina 350 International Association

I bought a Catalina sailing boat 350mkII model on September 2008. I decided to substitute the original propeller with a Gori propeller (model 16,5"x 12" x 3RH) on March 2011. The result was a disaster with this propeller, in fact the engine a Yanmar (model 2YM15/3YM20/3YM30) was not any mo...