What necessitates a deep Vee's hull bottom to be blue printed? ..........I hear this alot, but vaquely understand. I have a bare hull 27" magnum sport right now in the process of transom replacement and new fuel tank changes among other things. I have a 7' straight edge level, would placing this on the edge of the strakes (inner or outer) make it obvious for blue printing if it's not level?...........I think "hook" mean concave depression....and "rocker" convex, must either one of these be eliminated to arrive at a "blueprinted" bottom?

Thoughts??.....Anybody??

Isnt this exactly what Steve1 is an expert at ??

I'll wake him up.

Hook and Rocker each have a purpose, whether that purpose meets your need is another story. Hooks can develope if the boat is stored improperly on a rack or trailer too.
Basically in blueprinting your making sure the bottom is flat and the strakes are the same size, shape, location etc.

A hook will push the bow down, rocker will help carry the bow

LOL hooks range from slight to a monster "Hogs Back" as the old guys called it ,the boat should have a set amount of what we call constant running surface where the bottom and strakes are straight for a portion of the length this could be up to 33% then converge to the bow ,phragle is right ,consistency is the key here the strakes get trued up and sharpened same with the Keel and bottom transom junction. with the boat apart after the transom repair turn it over and take pictures with straight edges on the strakes and we will guide you through the process

The other day I got up close to a simular boat as mine just to take a look at the hull and try to compare the difference I felt around the outter strakes. The differences were pretty stark, on mine, the edges were blunt but straight as if feeling a piece of plastic corner molding. The other boat (27 mag starfire set up for racing) I felt as if I could cut my finger along the edge of the strakes, that's how sharp they were. Looking foward to flipping the boat after the transom is in and see what I got down under.

This will be a great learning thread if we had some pics.

Will document for sure when I approach this faze of the resstoration...............Thanks for all your help!

scippy all the mag sports i have ever owned have had hooks in the hull and strakes which eventually i removed along with making the strakes on the running surface very sharp like Skaters and your best bet..... just to get a general idea of what you might have i would suggest putting a straight edge along the bottom of the hull and strakes using a nice peice of aluminum stock which you already have just to get to see how straight your bottom really is .