When you start looking for the right boat, it's important to understand
types of hulls and bottom shapes that are available, and know what they
will - or will not - do for you.

Let's look at hull designs. The displacement hull will always displace
(push away) water equal to its total weight. If its total weight is
equal to the weight of the water that it's displacing, the boat will
float. If, on the other hand, its weight is more than the weight of the
water that it displaces, the boat will sink. For example, a cork will
float but a lead fishing sinker will not.

As the displacement hull begins to move through the water, small waves
appear at the bow and further aft along the hull. When speed is
increased, these waves grow larger and the distance between them
increases, until the boat is riding between the two waves that it is
creating. At this point, the hull has reached its maximum hull speed.
Adding additional horsepower after this point only makes the waves
bigger, with very little or no increase in the speed of the boat.

To get a close approximation of what the maximum hull speed of any
displacement hull boat will be, use this simple formula:

1.34 X the Square Root of the Boat's Waterline Length (This is
Theoretical Maximum Hull Speed)

Example: If your waterline length is 30 ft, multiply 1.34 by the square
root of 30 (5.48). 1.34 x 5.48 = 7.3. The product of this
multiplication, 7.3, represents the boat's maximum hull speed in knots.

Round bottom boats are the basic displacement hull design. Some
advantages of a displacement hull are 1. a relatively small engine can
easily drive it; thus, its ability to travel long distances is
outstanding, and 2. because it's traveling through the water, not on
top of it, it has a very smooth, seaworthy ride. However, an obvious
disadvantage is that this boat hull is slower than molasses in January!

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