Here is a great article...https://www.yachtingmonthly.com/gear/folding-and-feathering-propeller-test-29807
Personally I don‮t know if it is worth changing. The j30 maneuvers quite well under power compared to just about any other cruising boat that weigh more and have more full keels and a prop that is not centered. A new folding prop will Be very expensive and a fixed prop will give you a ton of drag. The trick, especially when backing up, is to get the boat moving and not go slow. Once you get flow over the keel and rudder, she is quite easy the maneuver in tight quarters in reverse. my understanding is that most 30‮s will pull to port when first moving in reverse, which means always turn clockwise. If you have a Martec two blade folding, if you decide to reprop, lmk if you want to sell the martec.
