Last season I repowered my Catalina 30 with a new M3-20B Universal diesel engine. Its power curve was substantially different from the original engine, so I also changed the propeller. I ordered a new shaft, a new coupling half (fitted at the supplier) and a new prop.
The Star class may no longer have a spot in the Olympics, but that hardly seems to have slowed it down. On the contrary, with the advent of the new Star Sailors League—a pro series featuring some of the best sailors in the world—the future of the 100-year-old one design appears to be stronger than ever.