You can run up to a 15 1/4" dia. on an Alpha1- it will barely clear the cavitation plate. If you run a Bravo One four-blade on an Alpha however, get your check book out. It puts too much load on it, and you WILL replace your drive. Know those who tried it, and same result every time.
Stick with the REV4 if you have to run a 4-blade on an Alpha.
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