What type of engine typically provides more power per pound of weight in boats?

An outboard engine is generally recognized for providing more power per pound of weight in boats, largely due to its design and construction. Outboard motors are mounted outside the hull of the boat and can be less complex than inboard engines. This design allows for a more efficient power-to-weight ratio because the engine is lighter and more compact, making it easier to install and maintain.

Additionally, outboard engines are often designed for performance and maneuverability, which can enhance the overall power-to-weight dynamic. They take advantage of advancements in technology and materials that contribute to lighter and more powerful engines.

In comparison, while inboard, stern drive, and jet drive engines each have their own advantages in specific contexts, they typically don't match the power-to-weight efficiency of outboard engines due to factors such as their additional complexity, weight, and location within the boat’s structure. This makes outboard engines particularly popular for smaller boats and those designed for high-performance activities.