The speed of the water flowing past the rudder greatly enhances which force?

Prepare for the Boat Crewman Test with flashcards and multiple choice questions, complete with hints and explanations for each question. Ace your exam!

Multiple Choice

The speed of the water flowing past the rudder greatly enhances which force?

Explanation:
When the rudder moves through water, it acts like a small wing in a fluid. The flowing water is deflected around the rudder, creating two forces: lift, which is perpendicular to the flow and pushes the rudder to one side, and drag, which acts along the flow and resists the movement. As water speed increases, the dynamic pressure rises with v^2, so both lift and drag increase. The turning of the boat, however, comes mainly from the lift on the rudder—the sideways force that creates a yaw moment on the hull. Drag also grows with speed but does not produce the turning effect itself; it mainly adds resistance. So the force that increases most with water speed and drives the steering action is lift, which generates the turning moment.

When the rudder moves through water, it acts like a small wing in a fluid. The flowing water is deflected around the rudder, creating two forces: lift, which is perpendicular to the flow and pushes the rudder to one side, and drag, which acts along the flow and resists the movement. As water speed increases, the dynamic pressure rises with v^2, so both lift and drag increase. The turning of the boat, however, comes mainly from the lift on the rudder—the sideways force that creates a yaw moment on the hull. Drag also grows with speed but does not produce the turning effect itself; it mainly adds resistance. So the force that increases most with water speed and drives the steering action is lift, which generates the turning moment.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy