Which of the following are the three basic types of hull forms based on speed?

The three basic types of hull forms based on speed are indeed displacement, semi-displacement, and planing. This classification is fundamentally connected to how a vessel interacts with water at various speeds.

Displacement hulls are designed to push water aside as they move through it. They operate underwater at slow speeds, where their hull shape creates a wave behind the boat. This type of hull is optimal for stability and efficiency at lower speeds, typically used in larger vessels that travel long distances.

Semi-displacement hulls are a compromise that allows for moderate speeds, combining characteristics of both displacement and planing hulls. These hulls can rise partially out of the water at higher speeds while still maintaining some of the efficient characteristics of a displacement hull.

Planing hulls are designed to rise fully out of the water as speed increases, significantly reducing water resistance. This allows for high performance and faster speeds, commonly found in smaller, high-speed craft like sports boats or rescue boats.

This classification highlights how the design of a hull affects its performance and suitability for different operational speeds, which is crucial knowledge for those involved in boat operation and crew training. The other options list different classifications or characteristics of hulls but do not accurately convey the relationship between hull shapes and their speed