Originally Posted by Oldun
What were the negative effects you encountered with the outboard based fins. I was concidering fitting them myself. Oldun.
I'll say first of all that it was not a RIB, but a an open GRP sports boat that I used them on. The trouble I has was that when turning at speed, the bow of the boat would really, really dig in hard. For this particular hull, it would sometimes cause the boat to then heel hard in the opposite direction to the turn. This was particularly noticeable with a following sea, under which conditions it felt actually pretty dangerous.
I'm not saying it was all down to the fin, it could have been the combination of it with that hull, but it definitely didn't work well!