It's about time for another update on the Starwind 860 power trimaran project.

Katy calls it a "boat embryo" now. Several key assemblies- the outrigger struts and the strut-to-crossbeam junction blocks- are complete. Almost all of the custom machining is done. There's a steering wheel (a proper ship's wheel, of course- could it possibly be otherwise?) and the helm shaft assembly is finished except for a bit of thread cutting.

Among the key questions that must be answered in any powerboat's design phase are: How much power does it need, and how far can it go between gas docks?

The Starwind 860 trimaran that I'm currently working on started life as a series of computer simulations to answer these two questions. In today's post, I'll take you through some of these calculations and the logic that led to the final choices.