How to Cut the Bunker Bill: Preparing for IMO 2020

How to Cut the Bunker Bill: Preparing for IMO 2020

Ready or not, here it comes! No matter who you talk to, IMO 2020 promises to be a time of uncertain fuel prices. If fuel prices will go up, your fuel consumption needs to go down. Here are eight practical ways to reduce your fuel consumption.

How to Design a Waterjet: Key Elements of Waterjets

How to Design a Waterjet: Key Elements of Waterjets

What makes a waterjet work? What is the difference between a good and bad waterjet? Waterjets may appear to be brutes of power, but they rely on delicately balanced design equations. Learn the common elements that go into all waterjets and discover the best practices that you should expect from any decent waterjet design.

Waterjets: When to Use, Pros and Cons

Waterjets: When to Use, Pros and Cons

Waterjets are fun. They give you great maneuvering control and promise much higher efficiency at high speeds. But that flexibility comes with the price of more subtle limits on performance. Used incorrectly, waterjets perform worse than propellers. This article focuses on the merits of waterjets, with focus on the most important factor: efficiency.

The TRUTH of Hull Speed: How to Break the Sailing Speed Limit

The TRUTH of Hull Speed: How to Break the Sailing Speed Limit

Hull speed is bogus, but not because the math is wrong.  This formula supposedly predicts the maximum speed of a yacht based solely on length.  It gets discussed frequently in sailing yacht communities.  Surprisingly, hull speed is partially correct, with a very...
How to Make a Boat Propeller

How to Make a Boat Propeller

I love to learn how industrial equipment gets created.  Boat propellers are especially interesting.  Unlike ship propellers, these smaller propellers go on leisure craft and other small vessels.  The emphasis is on mass production.  That mass production requires an...
Propellers By the Numbers: Propeller Dimensions

Propellers By the Numbers: Propeller Dimensions

How Propeller Dimensions Affect You Quick!  Name all the different propeller dimension terms you need to specify the exact shape and size of a propeller: Propeller diameter Number of blades Pitch Blade area Blade skew Blade rake Propeller section series Rotation speed...