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We installed an18" diameter 3-blade about 4 years ago. My notes show I set it for 18° in forward and 14° in reverse per Martec's recommendation. While it was still on the shop bench I checked it and 1 turn of the screw changed the pitch about 2.7°. The 18° wasn't enough and we were noticebly underpitched so one day when the weather and water warmed up I spent a couple of hours doing trial and error, diving and adjusting. It took 3 or 4 tries to get it right and I didn't keep track but I think we ended up with about 22° or 23°. I left reverse where it was and it works fine. Adjusting it is easy and only took a couple of minutes between each full power test.