Originally Posted by janwillem
do you think it has an effect on speed?
Depends on the hull. While trim tabs and/or trimming the engines down to keep the bow-rise under control (if any) lower speed, having clean water to the props is a big plus for speed. Most of the boats with them around here are fishing boats, not racing boats.
Is the hull unbalanced with the outboards on the brackets? Ryan Pratt on this boat has retrofitted several hulls from I/O to outboard, he's used brackets or engine pods. You might ask him why and how he gets the dimensions correct.