A final series of calculations must be completed so we can build the
correct sheer (upward sweep) into the deck. We are going to build this hull
upside down. We need to build a set of shim blocks to place under the
subdeck that will allow us to form the subdeckto the sheer of the main
deck.
I will explain how to calculate the dimension of the shim blocks for
a hull with a step deck. It works the same for a flush deck ship its just
that each shim block is usually a different size.
Measure carefully, record your measurements clearly then convert
your measurements for scale. This is one of those times when you must
get things right. Incorrect calculations can result in a deck that is too flat
and a keel that sags.
On the hull profile, measure from the top of the bow down to the
bottom of the keel. Move aft to the step in the deck. Measure from the deck
down to the bottom of the keel. Add this dimension to the bow dimension.
Using the scaling formula convert the measurements.The sum is the
dimension of the aft deck shim blocks.
the dimension in 1/72 scale.
On the profile view determine where the sheer of the folksail deck
becomes evident. Mark the drawing and measure aft to the step in the deck.
Convert the measurement. This measurement will be used in the next step
when we secure the subdeck to the building board. Measure and convert the
dimension for the flat part of the folksail deck,subtract this dimension
from the bow dimension. The difference is the size of the shim needed for
this portion of the deck. The length of the flat portion of the deck will
determining how many shims you need.
From the point where the sheer appears to start to thebowmake
three or four evenly spacedmeasurements from the deck to bottom of the
keel. Convert these measurements and subtract from the bow dimension.
These will be the single one of a kind shims. If you mark the shims with
the closest frame number from your dimension point it will prevent
confusion in the next step.
