I own a 1986 O'Day 31 that I purchased new. I replaced the original 15-9 prop years ago with a two-blade Crusising Design Composite. It gave me much better performance (especially in reverse). Last summer my brother-in-law took the helm while I went below for a few minutes...whoops! The bottom line is that when the "tug" pulled us off, the prop broke. I tried getting a new Cruising Design replacement but they no longer make it and so I put the original back on. I had forgotten how bad it was! This past weekend I was in about a 20 knot wind and it took me "forever" to back away from a gas dock. Can anyone recommend a "reasonably priced" (I don't race), two or three blade prop that will give me decent performance. The boat has a 15HP Universal Diesel in it. I don't have the max RPM or ratio numbers on hand but I can get them if needed. Thanks for any help I can get on this. Ed