# Determining rail line?

Making a board for myself and have a technical, though probably very basic question: I’ve got the blank trued and prepared with shape profile cut out for a 9-6 noserider. The sides/rail edges are smoothed, flat, and at right angle to deck and bottom all the way around the blank. So I’m ready to begin rail bands for a 50/50 shape rail. Is the outer-most edge (rounded point of the egg)centered exactly between deck and bottom over the full length from nose to tail OR since the deck will be crowned more than bottom, should the edge line run at a certain consistent measure up from the bottom edge requiring deck to be rounded down further to meet this line (especially through the center area)? Sorry for the dumb question - glad you don’t have to be an expert just to qualify for a question here. Thanks much.

Rich, There are no dumb questions. In fact this is one that I would like to see answered by someone with experience. However, since the word was used, I would like to add my"dumb" question to this thread: Years ago when roughing out a shape the fellow showing me how to build a board wanted the thickness at the edge to be the same as at the stringer. Therefore, 50% would be exactly half the board. With dome and close tolerance blanks the thickness of a board is confined to a small flat area around the stringer when squaring bottem to edges to deck. The outside edge is much thinner. This being the case 50% of the thickness at the edge places the outside edge lower. This is no problem if you are making a modern down rail, however, it throws me off when I try to do an old style longboard. On the old boards the rail edge rises above 50% in the tail and drops down below in the nose. Ordinarily, I just toss the percentages and go with my eyes, but there must be a more accurate method. Thanks for starting the thread Rich. Patrick