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I just put a down payment on a 115 Tohatsu TLDI for my new to me 1989 Outrage 18. The salesman asked me what pitch prop I wanted. The props run 11" to 21". The rpm range is 5150 to 5850 and the gear ratio is 2.0 to 1. I will be running light with no more than 3 people. My guess would be either 15"or 17"but I would guess Tom the prop man would have a better guess. The boat will be in salt water and was just bottom painted after being soda blasted.