GPS system questions

by Peter Nielsen, Posted May 20, 2009
The Government Accountability Office’s report last week on the parlous state of the Global Positioning Satellite system should set alarm bells ringing. When a body like the GAO warns that the GPS system is in crisis, all of us – not just sailors – need to take notice. GPS technology is so omnipresent in modern life that few areas of transportation remain unaffected by it.The GAO report
"Can you give me some ideas on what might cause excessive white smoke in the exhaust of a 2-year-old Yanmar diesel?" Nigel Calder replies.

Tank Math: Full or Empty?

by Steve Henkind, Posted February 21, 2008
In the "Know-How" section of the March issue, Steven J. Henkind wrote about how fuel gauges operate and how you can prevent fuel-gauge errors. Here's the mathematical formula he discussed in the story.   You can also calculate the amount of fuel in a tank mathematically. For a rectangular tank, the calculation is easy: the overall volume of the tank = Length x Width x Height; if the

The Price of Power

by Nigel Calder, Posted June 17, 2009
As part of my hybrid propulsion research I have been looking carefully at large-capacity litihum-ion batteries as a possible energy source on modern cruising sailboats. Lithium-ion batteries are common in cell phones and laptops, but they are rarely used in higher capacity applications. This may rapidly change, because the hybrid automotive and electric vehicle markets are in desperate need of
Fifteen years of sailing around the English Channel, North Sea, Bay of Biscay and the Mediterranean taught me many things, not the least of which was the importance of good ground tackle and a means to handle it.
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