i'm currently running a 13 1/4 by 15 aluminum prop. i don't remember the brand. the engine is a 2001 yamaha 115 TXRZ (i believe) i'm not real mechanical so i don't know what the gear ratio is. i do have a line on a 17 pitch used alumium yamaha prop with a 13 1/4 diameter on ebay. i'm currently the high bidder, hopefully i can get it for cheap, as i'm the only bidder with a day left. i won't be in the water for about another month. when exactly do you determine your "on plane"? i have a video someplace of 13 my GPS at 13 knots which is what i determined to be on plane just be the feel and how the boat rode. but i'm not sure if there is a "book" answer for "on plane" i should not need a 4 blade as there is no weight back aft except for the engine, no livewell, etc... and there is no bow rise getting on plane.
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