Blackfin SKEG

Measuring for Fit
To determine the Blackfin model you need, measure from the front of the prop to the tip of the gear housing. Take your horiziontal measurement and match it to the one of the three Blackfin sizes.The Mercruiser Alpha One when measured falls into the medium category; however it will require a Small Blackfin.

Blackfin Small
10.5" to 12.5"

Blackfin Large
15.5" and longer