March 2014
Page 9
BOATING COLUMN:
All About Boat Propellers And Why They “ Walk”
Area Pet Photos: Sponsored By Beacon Suites Pet Resort & King’s Crossing Animal Hospital
By Captain Reg Fidoe
Beacon Suites Pet Resort was home to this very cute snow dog during the big snow in February.
Stokesdale Pet Resort To Expand This Spring STOKESDALE - Beacon Suites Pet Resort on Mt. Carmel Road in Stokesdale says it will be expanding soon by making new additions at their existing facility. The company says it will be expanding this spring by adding another building with a large indoor agility play area along with a larger grooming room. Beacon Suites opened for business in 2011 with 12 indoor/outdoor suites and four special needs suites for small dogs. The company is owned by Dominic and Trudy Benedict who live on the premises. They say that they look forward to pampering the pet guests each day, starting each morning with early lets-outs at 7:30am and finishing their day with the final let-outs each evening around 9pm. Beacon Suites is an all inclusive facility that includes all walks, let-outs, medicines administered, play, and attention at one competitive price including a free bath after a four night visit. The facility is open seven days a week for drop off and pick up. Beacon Suites invites anyone to drop by for a tour anytime. :
Family Seeks Lost Dog With Green Collar
BELEWS LAKE – We've all experienced a lack of cooperation from the wind and current in a closequarters maneuvering situation. So wouldn't it be Knowing more about nice if your boat's your boat propellers can propulsion system would help you in maneuvering help out just a little? There situations. are a few principles operating when our props are turning, but they may not always be obvious to us. First of all, let's start with the basics. There are a few names for a prop. It can also be called a propeller (obviously from which prop is derived), a screw or a wheel. Props are referred to by the direction in which they turn, by their diameter and by the pitch (angle) of their blades.
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The turning direction is either "right-hand" or "lefthand." In order to determine the direction that a propeller turns, you should observe the rotation from the stern. Moving forward, right-hand props turn in a clockwise direction and left-hand props turn in a counterclockwise direction. The diameter of a prop is a measure of the size of the circle in which it can turn. It isn't as simple as measuring across the blades, unless the number of blades is an even number. For example, a three-bladed prop with a diameter of 14" will turn within a 14" diameter circle. However, if you measure across two of the three blades, you will end up with something less than 14". You can measure the diameter across a 2-blade or a 4blade prop because two blades are directly across from each other. In that case, the diameter of the circle Tory is a beautiful dog who loves getting attention! would be the same as the measurement across the blades. Three and five blade props don't have two blades that are directly opposite each other, so the dimension across them will be less than the prop diameter. The pitch is another story. A prop's pitch is measured by how far it would advance if screwed into a solid object for one revolution. A pitch of 12 would indicate that the prop would advance, or move forward, by 12" for each revolution. Obviously, that wouldn't happen in water. Pitch is simply a way to measure the angle of the blades on a prop.
What does this all mean? The issue of your boat's failure to move in the right direction can be partially explained (not counting operator error). There is something called "prop walk" or "side thrust." Because A family in the northwest Guilford area is seeking the prop's blades are pitched, or angled, the thrust is A friendly puppy and her best friend say hello in their friendly, young dog who was lost on Valentine’s Stokesdale! Day in February. The dog has a green collar and a tag not totally in the forward or reverse direction. and has all of his shots. He also has a computer chip registered at Greensboro Animal Hospital. If you find him please call 336-662-7887 or at the family’s other number at 706-4246. ::
These forces cause a right-hand prop to "walk" to starboard and a left-hand prop to "walk" to port, moving the stern slightly with them. The majority of the thrust moves your boat forward, but some percentage pushes you to right or the left.
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In reverse, the "prop walk" is the opposite A righthand prop "backs" to port and a left-hand prop "backs" to starboard. If you have a twin engine boat, your props are almost always "counterrotating," which means that one is right-hand and one is left-hand and they rotate in opposite directions. When both props are in forward or both in reverse, the "prop walk" is cancelled out.
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ABOUT THE AUTHOR: Captain Reg Fidoe is the chief instructor of World Wide Marine Training, Inc., a U.S. Coast Guard Approved facility that is to give examinations for captain's licenses up to 200 Ton Master, Able Seaman up to Unlimited, STCW-95, Radar, ARPA and other Endorsements. In addition we offer CPR/ First Aid classes on the first Saturday of each month. Visit online at wegivethetest.com or call toll-free at 866-249-2135.
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So the next time the stern of your boat moves slightly sideways, you'll know why. The trick is to anticipate it and use it to your advantage! Until next time, I wish you fair winds and may the depth of water always exceed the draft of your vessel.
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