What type of vessel would primarily utilize a diesel engine?

Large cargo ships primarily utilize diesel engines due to their efficiency and reliability over long distances and heavy loads. Diesel engines are well-suited for the demands of shipping because they provide the necessary power to move large quantities of cargo across maritime routes while also being more fuel-efficient than gasoline engines at the scale required for large vessels.

Additionally, diesel engines operate well at a constant speed, which is ideal for the steady cruising speeds that cargo ships maintain. They also have a lower risk of ignition and are designed to withstand harsh marine environments, making them a safer choice for large vessels transporting goods over international waters.

In contrast, fishing boats often use various types of engines based on their size and purpose, while small recreational boats and yachts may lean towards smaller engines, including gasoline-powered engines, for cost and ease of maintenance. These engines are typically not as powerful or efficient as those found in large cargo ships, reinforcing why diesel engines are the preferred choice for heavy-duty marine applications.