Somewhat askew

Diagonals

Diagonals are fairing lines that help develop the shape of your boat so that it presents less of an obstacle to smooth movement through the water. Most designers will tell you that diagonals are shown on the plan view on the opposite side from the water lines. I prefer to simply use a different colour, in this case magenta. They will also tell you that diagonals are not shown on the profile. I prefer to show the diagonal as it helps me “see” the hull.

Diagonals usually go from some defined point on the centreline to the turn of the bilge, there may be more than one diagonal in a larger vessel in which case they are not numbered but identified by letters. In our case only one diagonal is needed.

The intersections are then transferred to the plan and profile using the method we have already discussed here.

The transferred intersections are then joined to form curves.

First in plan,

and then in profile.

These look very smooth and fair but if you look closely at the intersection with station1 in profile you can see a definite hump in profile and hollow in plan.

We'll put the buttocks in first before attempting any corrective action.