Boatworks

Propeller Puzzles

by Nigel Calder, Posted December 14, 2010
Steve Hiss of North Kingston, Rhode Island, asks:

"I’ve installed a rebuilt M3-20 Universal diesel on my 29-foot Ericson, and I’m wondering whether the new three-blade prop, which looks a bit too big, is correctly sized. When I put the engine in gear just above idle speed the boat moves forward quietly, but any increase in rpm produces a pulsing vibration under the back of


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Test Calls

by Gordon West, Posted December 14, 2010
Ralph Manies of Seattle, Washington, asks:

"We’ve installed a new ICOM-802 single-sideband radio and now we want to test its DSC (digital selective calling) features. What’s the best way to do this?"

Gordon West replies:

First enter your MMSI number into the unit’s memory and then hook up the second receive antenna to the DSC antenna


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Smoking Windlass

by Gordon West, Posted December 13, 2010
Bob Foster of Sarasota, Florida, asks:

"Last week, while my wife and I were cruising, our windlass motor suddenly stopped when I began to pull up the anchor. At almost the same moment, my wife shouted that she saw smoke coming from underneath the nav station. When we got home our local marine electronics technician told me that some of my electronic gear had been damaged as


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Noisemakers

by Win Fowler, Posted December 13, 2010

Rick McCowan of Mattapoisett, Massachusetts, asks:

 

"My boat has rod rigging. Whenever the wind blows between about 9 and 13 knots, the rigging hums quite loudly and it’s a bit annoying. Why is this happening, and what’s the best way to stop it?"

Win Fowler replies:

Although I need to know more about your rig to say for sure, I do have some


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All Amped Up

by Nigel Calder, Posted December 13, 2010
Mike Keller of Arlington, Virginia, asks:

"I recently upgraded the two lead-acid batteries on my Catalina to 79Ah Group 24 AGMs, and I’m thinking about wiring them in parallel to double my available power supply at anchor. I’d also add a small PWC battery for use as a starting battery. We don’t have refrigeration, but we do have lots of other gizmos that use power.

My


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