Chapter
Manoeuvring under power
Relate power, thrust, steering and movement.
Start this chapter ↗The engine supplies energy, the transmission carries motion to the propeller and the propeller interacts with water. The resulting hull response develops over time. The conceptual lesson distinguishes command, force and response; complementary lessons deepen diesel, shaft, saildrive and propeller families.
An ideal scenario shows a fixed heading while current changes movement over the ground. Another explains why removing propulsive force does not immediately remove speed. These are physical relationships rather than experiments to perform. Comparing systems avoids treating power as a direct prediction of handling. Gear commands, specific responses and manoeuvring paths belong to practical learning on the actual boat.
In this chapter
Lesson · 6 min
Engine, rudder and motion: three different relationships
A force changes motion; a command is not a trajectory.
Lesson · 3 min
Diesel power and horsepower per tonne
Horsepower is not a speed prediction.
Lesson · 3 min
Shaft drive, saildrive and propellers
Drive and propeller are part of the propulsion system.