February 9, 2011

Helm Balance – Center of Effort, Lateral Resistance, Centerboard, Mast Rake

Slight Weather Helm

Often when reading about sailboats, one encounters criticism with respect the excessive weather helm as a negative characteristic of a vessel’s sailing performance. With a little research, weather helm is revealed as a tendency of the sailboat to turn windward necessitating a constant and opposite application of pressure on the tiller or wheel. Then opens a whole science related to helm balance. Properly designed cruising sailboats exhibit a slight weather helm. The alternatives are as bad as excessive weather helm. Neutral helms do not provide feedback to the captain while lee helm vessels can accidentally jibe, a dangerous maneuver, or get knocked down by nasty and unexpected puff. Let’s take a look at the ways to balance the helm which include mast location, bow sprites, reefing, mast rake, centerboards, weight distribution, and heeling. Continue reading “Helm Balance – Center of Effort, Lateral Resistance, Centerboard, Mast Rake” »

January 28, 2011

Marine Shore Power – 15/20/30/50 Amps, 120/240 Volts, Adaptors

Filed under: Yachting — Richard Jordan @ 11:55 am

30 Amp Shore Power Cord

Shore power is a jungle that takes equal parts captain and physicist to navigate. Add on the complexities of European power arrangements, and one is truly overwhelmed. In this article, I will organize the options, explain why each is used, and what you can and can not do. The options I will cover are 15/20, 30, 50, 16, and 32 amp service.

US Households: 15/20 Amp, 120 Volt, 60 Hertz
In US houses, outlets provide 15/20 amps of current with 120 volts over 60 Hertz alternating current (AC). All US appliances such hairdryers, vacuums, TV sets are engineered to run off this set of variables. US vessels provide these 120V AC outlets throughout their interiors, so those aboard can use the same electrical appliances. Logically older vessels plugged into a shore power supply that provided 15/20 amp, 210 volt service like any other appliance. The vessels were another appliance connected to the shore system. But with ever increasing complexity, vessels soon needed more than the 120 volts times 20 amps equals 2,400 watts of energy. Remember from physics that Watts = Voltage x Amps. Either the voltage or amperage needed to increase. Continue reading “Marine Shore Power – 15/20/30/50 Amps, 120/240 Volts, Adaptors” »

January 13, 2011

Sailboat Rig Types: Sloop, Cutter, Ketch, Yawl, Schooner, Cat

Filed under: Yachting — Richard Jordan @ 2:47 pm

Staysail Schooner Rigged Tayana 55

Naval architects designate sailboat rig types by number and location of masts. The six designations are sloop, cutter, cat, ketch, yawl, and schooner. Although in defining and describing these six rigs I may use terminology associated with the sail plan, the rig type has nothing to do with the number of sails, their arrangement or location. Such terms that have no bearing on the rig type include headsail names such as jib, genoa, yankee; furling systems such as in-mast or in-boom; and sail parts such as foot, clew, tack, leach, and roach. Rig questions are one of the primary areas of interest among newcomers to sailing and studying the benefits of each type is a good way to learn about sailing. I will deal with the rigs from most popular to least. Continue reading “Sailboat Rig Types: Sloop, Cutter, Ketch, Yawl, Schooner, Cat” »

December 30, 2010

Guide to Anti-fouling Paints: Biocide, Ablation, Teflon

Filed under: Yachting — Tags: , , , , , , — Richard Jordan @ 2:02 pm
Boat Bottom Paint

Topsides, Boot Stripe, and Bottom

Anti-fouling paint protects the bottom of a boat’s hull from slime, weed, and barnacles. The active ingredient in the paint matrix is a biocide which differs depending on the location factors (water flow, salt concentration, temperature) and the type of usage. The three major types are (1) traditional, erodible, and hard paints. This article covers the trade-offs with each and their unique maintenance issues. Continue reading “Guide to Anti-fouling Paints: Biocide, Ablation, Teflon” »

December 14, 2010

Wood Boat Construction: Frames, Planking, Fasteners, etc.

Filed under: Yachting — Tags: , — Richard Jordan @ 1:44 pm
The Bones of a Canoe

The Bones of a Canoe

I purchased the December 2010 issue of Wooden Boat magazine the other day at West Marine. As a brokerage we sometimes used to advertise in it especially when we had a wood boat for sale. These days that is pretty rare. I have been thinking about wood boats a bit more recently, so here is an article on the basics of wood boat construction. When talking about wooden boat construction, there is a basic set of questions and associated terminology that are wholly different from those of glass techniques. This article goes through the two basic questions and lists possible answers for each. Continue reading “Wood Boat Construction: Frames, Planking, Fasteners, etc.” »

October 7, 2010

5 Common Causes of Low Diesel Engine RPMs

Filed under: Yachting — Tags: , , — Richard Jordan @ 11:29 am

Low max RPMs is a common symptom of propulsion problems. In full throttle, the tachometer does not go to the engine’s rated max RPM’s. Please read on for possible problems and troubleshooting options. Continue reading “5 Common Causes of Low Diesel Engine RPMs” »

October 3, 2010

10 Common Causes Of Marine Diesel Engines Overheating

Filed under: Yachting — Tags: , , — Richard Jordan @ 12:33 pm

Perkins 4-108 is the most common diesel on sailboats and not immune to overheating.

Overheating is a common symptom of marine diesel engine blockage. Marine diesels should run at 180 degrees Fahrenheit. When the temperature goes above 200, start getting worried. Dialing down the RPM’s may allow the engine to recover and run well at a more leisurely pace. Overheating is difficult to diagnose, and the only real way to solve the problem is a systemic examination of every engine element, i.e. trial and error. Here is a starter list of parts to examine: Continue reading “10 Common Causes Of Marine Diesel Engines Overheating” »

July 17, 2010

Hylas Davits: Simpson-Lawrence, Wells Marine, Atkins and Hoyle, Kato

Filed under: Yachting — Tags: , , , , , — Richard Jordan @ 10:01 am

Kato Voyager Davits on a Hylas 54

Hylas yachts with their sugar scoop sterns can be difficult for davits. The davit arrangement needs to reach past the swim platform and high enough vertically for dinghy stowage and security. The davits can become an obstacle in using the swim platform. The 49 is particularly difficult because of her narrower stern. The four most popular options are Simpson-Lawrence, Wells Marine, Atkins and Hoyle, and Kato davits. All these companies have experience with manufacturing davits which function properly and blend into the lines of Hylas yachts. Continue reading “Hylas Davits: Simpson-Lawrence, Wells Marine, Atkins and Hoyle, Kato” »

May 30, 2010

Sailboat Steering and Propulsion- Stuffing Box, Propellor, Cable, Rudderpost, Rudder

Filed under: Yachting — Tags: , , , , — Richard Jordan @ 7:54 am

The steering system on a sailboat is composed of sub-systems including pieces such as the cable, rudderpost, and rudder itself. The propulsion system includes parts such as the propellor and stuffing box. Continue reading “Sailboat Steering and Propulsion- Stuffing Box, Propellor, Cable, Rudderpost, Rudder” »

February 8, 2010

Marine Diesel Engines – Parts, Fuel, Lubrication, Cooling Systems

Engine Diagram (Courtesy Marine Diesel Engines by Nigel Calder)

Engine Diagram (Courtesy Marine Diesel Engines by Nigel Calder)

The core of marine diesel engines are the combustion chambers. In each chamber, a piston goes goes up and down based on the combustion of diesel fuel. A connecting rod transfers the motion of the piston to the crankshaft. The crankshaft converts the up and down motion to useful rotation. At its most basic level, the idea is simple, but to make an engine work in the real world, systems must inject fuel, lubricate the pistons, and dissipate excess heat. These three systems are known as the fuel, lubrication, and cooling systems. Continue reading “Marine Diesel Engines – Parts, Fuel, Lubrication, Cooling Systems” »

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