The 21 pitch came with the boat. Not a lot of room on an Alpha1 for more diameter. A 4 blade is an option. I'm a little leery of putting a lot more strain on the outdrive. Alpha1's are not all that strong. I wish I could find a Searay Alpha1 that they put behind a 454 - stronger upper gears is what I hear. We will be careful on the launch with the 21pitch - it's actually uncomfortable it pulls so hard with the 19.
I think I can get a 14" prop on there and still have some clearance
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