When fairing, there is a lot of eye-balling and squinting, there is little to measure, it is a great challenge. You imagine how you could be handicapping the boat’s performance with a lumpy underwater profile.
The objective is to create an even surface on all planes of the curved bottom of the sharpie so the bottom laminations have the greatest, most smooth surface to adhere to. Knowing how much to plane off of where is the key.
The main points of reference are the edges of the bulkheads that face the ends of he boat. And one great benefit of a laser cut kit is the charred edges. You can plane up to and cut off the charring and you know you’ve found the feather you require.
In the photo you can see me using a saw to cut down to the depth needed to fair off the chine logs. This extends the line of the bulkhead through the waste material. It you take the end of that saw kerfs, join them up with a fairing baton and there is your objective.
Very rewarding work.