Aluminum Boats Lightning Mode
12.12.2020
Lightning Protection Tech Tip
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Members List. Mark Forums Read. Vendor Directory. Welcome to the updated THT! Xluminum you are having trouble signing in, please email feedback thehulltruth. We thank you for your patience as we help you access the new site! The Boating Aluminum Boats Lightning Mode Forum. Thread Tools. They look really nice and low maintenance! But I am wondering how they would react if caught in a lightning storm compared to a fiberglass boat??
View Public Lughtning. Send a private message to Inpursuit2. Find More Lightning Mode Aluminum Boats Lightning Aluminum Boats Mode Posts by Inpursuit2. I beleive they are actually very safe. I dont know aluminum boats lightning mode, but thats what Ive heard.
Senior Member. Received 1 Like on 1 Post. Check out the Black Lab site www. Jay has Mode Lightning Aluminum Boats Aluminum Boats Lightning Mode an article directed to this issue. Bottom line, no small boat is safe in lightning. Send a private message to BroadCove.
Find More Posts by BroadCove. Received 14 Likes on 12 Posts. In a FG biats the electricity has to Aluminum Boats Lightning Mode find a way to the watervia coax and small gage wiring. So in a glass boat YOU stand a better chance of becomming a resister as the juice is trying to find aluminum boats lightning mode path to ground.
Of course Aluminum Boats Lightning Mode Boats Mode Aluminum Lightning Boats Aluminum Lightning Mode I would choose not to be in a lightning storm in either boat but if aluminum boats lightning mode in my boatget low and under the T-top. If you go to aluinum. Lester If you would like a ride let Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Mode Aluminum Boats Lightning me know. Send a private message to welder. Visit welder's homepage! Find More Posts by welder. CB Haws. Received 21 Likes on 12 Posts. What welder said. I have seen the lighting strike the water right next to my Lightning Mode Aluminum Boats aluminum Ligtning several times.
No problems. I believe the aluminum boat even bleeds off the charge buildup. My 35 Bertram has a big 6 gage green wire running off the outriggers, hardtop, aluminum boats lightning mode rail. They ran the wires at each bowrail stanchon, each hardtop mount, riggers and supports ect. Looks to me like Bertram was trying to get as good aluminum boats lightning mode path to aluminum boats lightning mode as possible, but in an bare aluminum Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode boat the whole hull is grounded.
That has got to be safer. Send a private message to CB Haws. Received 63 Likes on 17 Posts. Not a very good combination! Send a private message to TwentyFourSeven.
Yes Brad Coves link Aluminum Boats Lightning Mode Aluminum Mode Lightning Boats Aluminum Lightning Boats Mode to the article is the one I was thinking. Kind of counter intuitive but it makes since to me. Send a private message to skyranchrob. Find More Posts by skyranchrob. Attached Images. Send a private message to summertime. Find More Posts Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode by summertime. Likes: 9. Received 1, Likes on Posts. Send a private message to SeaJay.
Find More Posts by SeaJay. Admirals Club. Likes: Received aluminum boats lightning mode, Likes on 2, Posts. Originally Posted by welder. Send a private Aluminum Boats Lightning Mode message to triumphrick. Visit triumphrick's homepage! Find More Posts by triumphrick. Posting Rules. You may not post new threads. BB code is On. Smilies are On. Trackbacks are Off.
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Although the current is very small, less than 3 millionths of an ampere per square kilometer, it amounts to an average global current flow of about 2, amperes. Nature balances this current flow by creating about lightning strikes per second. Lightning Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode occurs both within the atmosphere, cloud-to-cloud lightning, and from the atmosphere to the earth, sky to ground lightning or the reverse, ground to sky discharge. Regardless of the direction of the lightning stroke, a great deal of energy is released Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode as the electrical charge balance of the atmosphere-earth is restored.
An average lightning strike consists of three strokes, with a peak current flow of 18, amperes for the first impulse and about half that amount of current flowing in the Boats Lightning Aluminum Mode second and third strokes. Typically, each stroke is complete in about 20 millionths of a second. Once the lightning strike occurs, the air becomes a conductive plasma, with a temperature reaching 60, degrees.
The heating makes the plasma luminous; in Aluminum Boats Mode Lightning Aluminum Boats Lightning Mode fact, it is brighter than the surface of the sun. Measurements made of the current flow in the lightning strike show that 50 percent will have a first strike flow of at least 18, amperes 18 kiloamps, or kA , 10 Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode percent will exceed 65 kA, and 1 percent will have a current flow over kA.
The largest current recorded was almost kA. People who have boats and those who have towers or tall buildings share a common concern about lightning. Due to the altitude distribution of the air movement in the atmosphere that gives rise to the charge imbalance, things that are tall and stick up into the atmosphere are likely to be attractive targets as nature tries to rid itself Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode of the charge imbalance.
Since there are more tall towers than seriously tall boat masts, and since lightning-strike records are kept for these towers, we can use this data to ascertain the affect of tower height on attractiveness for lighting Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode strikes. The Westinghouse Co. The number of strikes per tower or mast did not reach two until the height of the tower exceeded feet.
With a tower 1, feet high, the strike frequency was about nine. Towers more than 1, feet high were struck more than 20 times. Although the data may not be accurate for very small towers or masts, it appears that the chance of a typical foot sailboat mast being hit will be quite close to, but clearly not zero.
We know that there is always a chance of being hit by lightning; after all, people walking on beaches have been hit. The ground wire, usually the topmost wire in an electrical power transmission line, is frequently hit. Trees are hit very often, sometimes exploding due to the instantaneous vaporization of moisture within the wood.
Concern about lightning strikes on golf courses is sufficient to cause the Professional Golf Association to take special measures to ascertain the Aluminum Boats Lightning Mode level of a threat of lightning and to stop play when the local electrical field strength and other indicators show a probability of lightning.
Some people believe that by constantly discharging the charge build-up on an object, the magnitude of the Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Lightning Boats Aluminum Mode charge imbalance can be controlled and kept to a level where a lightning strike will not occur.
Continuous dissipation of static charge potentials is used in every electronics laboratory that works with sensitive integrated circuits and transistors. The workers wear Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode wristbands of conductive material that are connected to the rooms electrical ground. Charges bleed off before they reach levels that might destroy the electronics. Unfortunately, what works in a laboratory, with very modest static charge quantities, does not work in nature.
We can begin with some interesting evidence in nature. Trees have many thousands of reasonably sharp points. These points should operate somewhat like man-made charge dissipation devices. The evidence shows that trees, even small trees, are constantly being hit Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode by lightning.
Although trees are not terribly good conductors of electricity, they do in fact conduct to some extent, as witnessed by the lightning strikes they suffer. Suppose we substitute a carefully designed set of sharp points for the branches Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode and twigs of the tree.
We will make the sharp points of a material that conducts electricity very well, perhaps metal, or graphite used in aircraft static wick systems. The idea is to take the electrostatically induced potential in the ground system and convey it to the sharp points where it can create ions in the air. Sharp points create the greatest possible voltage gradient, enhancing the creation of ion flow.
As the ions are created, they are supposed to be Aluminum Boats Lightning Mode carried away by the wind, eliminating or greatly reducing the total potential difference, thereby reducing or eliminating the chance of our object being hit by lightning. The problem with this approach is that the earth can supply a charge far Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode faster than any set of discharge points can create ions. A bit of math will show that a carefully designed static discharge wick or brush can create a current, in an electrical field of 10, volts per meter, of 0.
The impedance of a site on hard ground is typically 5 ohms. The ratio of the ability of the earth to supply a static charge is inversely proportional to the impedance of the conductor. In this example, the ratio of Mode Lightning Boats Aluminum Aluminum Boats Lightning Mode Mode Lightning Aluminum Boats Aluminum Boats Lightning Mode impedances is 20, : 0. The earth can supply energy 4, times faster than the rate at which a static discharge brush can dissipate the energy! The impedance of saltwater is a great deal less, on the order of 0.
Another Lightning Boats Aluminum Mode concept quoted by advocates of lightning prevention through the use of static discharge devices is that the wind will carry off the ions being released by the wicks or brushes. Not only will the wind-blown ions not prevent a strike, Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode they may present a converse affect when there is no wind.
In this case, they may migrate upward, making the air more conductive and possibly creating an attractive point of attachment for a step leader which is lurking above looking for Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode a place to strike. Scientific evidence of the behavior of the step leader indicates that it moves in steps about feet long. This indicates that objects more than feet above the surrounding terrain are more likely to be hit than those which are shorter most sailboat masts.
Until , it was assumed that a grounded mast would provide protection against a direct lightning strike for all objects within a degree cone whose apex was at the masthead.
This code recommendation assumes Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode that a percent protected volume exists adjacent to a grounded mast, with the boundary of the protected volume described by a curve having a radius of feet the length of one step in a step leader.
Makers of static discharge Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode devices often quote evidence of many installations that once equipped, have never been hit by lightning. Unfortunately, these reports must be considered as anecdotal, not scientific proof of the value of the system. The fact is that the chances of Aluminum Boats Lightning Mode a given mast or tower of the dimensions of a typical sailboat mast being hit by lightning are exceedingly small.
The willingness of some makers of these systems notably Island Technology, maker of No-Strike devices to offer to pay the Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode deductible amount on an insurance policy, or a fixed amount if there is no insurance coverage, is good financial accounting on their part rather than proof of the scientific value of their device.
This income to cost ratio of is somewhere Boats Mode Lightning Aluminum Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode between very good and wonderful. What should you do to protect your boat from lightning? The best advice available today is to follow the practices recommended by the ABYC for both lightning protection and grounding.
Installation of a good lightning Boats Lightning Aluminum Mode protection system won't hurt. If you like the idea and appearance of a particular kind of static discharge device, sharp points, brush or whatever, install it. When in an active thunderstorm area, you may wish to have all personnel Aluminum Boats Lightning Mode stay as far from shrouds and the mast as practical, and refrain from using electrical equipment.
Some skippers may wish to disconnect electronic devices from all connections to the boat, power and antennas, although in the event of a direct Aluminum Boats Lightning Mode strike, even this may not protect the increasingly sensitive solid-state devices used in this equipment. The real risk from lightning appears to be greater for those who play golf than for sailors.
The practice at most golf tournaments held in Aluminum Boats Lightning Mode areas where lightning is common is to employ various weather monitoring systems to provide some advance warning of a coming storm or likelihood of lightning. A company appropriately called Thor Guard offers a lightning prediction system that monitors the electrostatic field Aluminum Boats Lightning Mode in the nearby atmosphere.
The system compares the monitored data with a stored data base and predicts the probability of a lightning hazard in an area up to 15 miles in radius from the monitor. This system is really not practical for use on a boat, although it could be used to provide warning for an area in which a small boat race was being sailed.
It would appear reasonable that, with the very large amounts of money involved in Mode Boats Aluminum Lightning Aluminum Boats Lightning Mode delaying a major golf tournament due to the chance of lightning, static dissipation devices would be sprouting from the fields and woods if they could be shown to work. The chances of being hit by lightning are very low. There Aluminum Boats Lightning Mode is really nothing you can do to dissuade Thor if he takes a liking to your masthead.
You might install an electrostatic field strength meter, or calibrate the hair on the back of your head. When the needle indicates a Aluminum Boats Lightning Mode high enough field strength, or when your hair stands up straight enough, give everyone except the helmsman their favorite drink and invite them to watch the show.
For more on on board electrical systems, grounding, and lightning protection see our Mode Boats Lightning Aluminum Aluminum Boats Lightning Mode ebook Marine Electrical Systems � The Complete Series available in our online bookstore.
I remember reading about this stuff from the Florida Lightning Research Laboratory back in about But even grounding the mast on the catamaran is questionable due to the bridge deck and high energy not liking to turn corners. In 10years cruising never heard a good answer. When I was leading the design of an aircraft antenna for Inmarsat communications which was to mount under the fibreglass fairing at Aluminum Boats Lightning Mode the top of the vertical stabilizer we were concerned about lightning strikes.
We could not use the heavy aluminum straps used on nose radar domes as this would have degraded the performance of the antenna. We found that a strip Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode of copper shim washers which were not touching each other and supplied as a self adhesive strip could provide lightning protection without interference with the antenna. I understood that this was something invented by a Boeing engineer. The theory was that at very high voltage the strip would be conductive enough to discharge the air near it so that lightning would not conduct near it.
The strike took out the UHF antenna; twirling it like a baton. The boat was Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode chasing us. When we returned to the clubhouse at the Bristol, RI yacht club, the captain was unaware his yacht had been struck. Taking down the mast revealed the entirety of the top of the mast work was melted.
No Aluminum Boats Lightning Mode injuries. Does it make sense to store electronic devices like computers, tablets, or smart phones in the oven during a thunderstorm? Thanks for the great academic review. This might sound a bit naive but does attaching heavy duty battery cables to Aluminum Boats Lightning Mode the upper shrouds at the deck and letting them dangle in the water help dissipate a lightening strike to the top of the mast? Or, prevent one for that matter? I tried this while crossing the Tehuantepec in Southern Mexico, Pacific side, when I went through a lighten storm where lightening was hitting the water all around me at a rate of about once every second, believe it or not.
It lasted for a good two hours. I was the only sailboat out there. Does anybody know if the cables might have made a difference, maybe by dispersing ions or something like that?
Or, if hit by lightening, would the cables be able to direct the charge to the water? Thank you. Or can it? I agree the article left me hanging with no course to follow.
How deadly are lightning strikes on sailboats? Should we just rely on insurance to replace damaged equipment? Steve not sure what protected your boat in that storm,,,,frightening. I am an engineer but no lightening expert. Here is my lightening story. Our neighbor was a visiting catamaran from Africa about 45 feet long on the face dock across from our boat. The masts Aluminum Boats Mode Lightning Aluminum Boats Lightning Mode were about 30 feet apart. Prior to the storm I recall talking to the cat owner as he had a serious cable from the mast into the water.
Said it was for lightening protection with a large copper plate in the Mode Lightning Aluminum Boats Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode water. That night his mast was hit by a lightening strike. The next morning we went to check things out.
The strike destroyed everything electrical or electronic including appliances etc. Melted portions of his masthead that rained down on his deck left burn marks. After hauling the cat there were hundred black soot holes at the waterline.
All needed to be repaired. The only thing that happened to me was the circuit breaker on my boat was tripped. Breakers on Aluminum Boats Lightning Mode the dock were tripped also. No electrical or electronic damage for me. Essentially the neighboring boat took a hit for me. The strike must have created quite an electromagnetic field to trip breakers.
Got lucky on this one. Can a well-grounded mast actually attract a strike? We were the only boat hit, and the water under the hull boiled orange! A couple of thoughts on boats and lightning and the lack of specific recommendations. Me; live in low lightning area, Mode Boats Aluminum Lightning Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode trailer sailor and amateur radio operator. I installed an outdoor antenna a year or so ago on the house. A child of the Midwest, I took lightning protection seriously.
Found a bunch of info on line, some good and some,Aluminum Boats Lightning Mode �. Lightning is so electrically huge that it will explore all possible paths.
Provide the easiest, most direct path possible for a lightning strike to reach ground that guides the current away from people and sensitive gear. Finally, let me reiterate - you are NOT safe on a metal boat in a lightning storm nor are you safe in a glass boat in a lightning storm. Relatively speaking, though, you are safer in a metal hull than a glass one. I Aluminum Boats Lightning Mode like that Very easy to comprehend, and very accurate.
I've been in the electronics industry for almost 25 years now and feel qualified to say Jay is correct. I really believe Jay accurately answered the lightning question that many Aluminum Boats Lightning Mode people have in their minds who are thinking about an alloy boat. Thanks guys! Nothing sucks more than that moment during an argument when you realize you're wrong. Faradays Cage - Interesting reading Post by peterbo3 � Mon Jan 14, am I saved this ages ago but I think it provides the definitive answer to the question.
With heavy thunderstorms you will often find lightning. Lightning on the water can bring life-threatening circumstances. For your safety and the safety Aluminum Boats Lightning Mode of others boating with you we have updated and are republishing this article on Lightning Protection. Matt Even though the odds are in your favor that your boat may never be hit by lightning, if it happens it can have devastating effects. Don't take a chance, protect yourself.
If you are in a small boat and close to shore when a thunderstorm approaches, get in and off the water immediately. Better yet, don't go out if thunderstorms are predicted. But what if you are miles offshore and a storm pops up? Hopefully, you have prepared in advance. The voltages involved in lightning are so high that even materials that would normally be considered non-conductive become conductors, including the human Aluminum Boats Lightning Mode body.
The voltages are so massive that if they start to travel through a boat's structure - say through its mast - then meet with high resistance for instance, the hull skin the current discharge, in its attempt to Aluminum Boats Lightning Mode Lightning Mode Aluminum Boats reach ground, may simply blow a hole in the non-conductive barrier. The safety conscious Captain should make sure that his vessel is properly protected. Reference should be made in detail to the standards for lightning protection as set forth by the American Boat and Yacht Council ABYC and the job should be performed by a licensed marine electrician.
In theory, a lightning protection system is used to create what is know as a "Faraday's cage," so called after the Mode Boats Lightning Aluminum Mode Aluminum Lightning Boats Aluminum Boats Lightning Mode late nineteenth-century scientist Michael Faraday. The principle of a Faraday's cage is to provide a surrounding, well-grounded, metal structure, in which all of parts are bonded together and carry the same electrical potential.
Such a "cage" attracts and carries Aluminum Mode Boats Lightning Boats Aluminum Mode Lightning any lightning strike to ground much like lightning rods on buildings. In other words, you need to provide an unobstructed way for the lightning to dissipate its energy to ground the water surrounding you.
Faraday himself risked his own life to Aluminum Boats Lightning Mode prove this theory. The additional benefit of a lightning protection system is that it tends to bleed off any charge build-up in the general vicinity, possibly averting a lightning strike in the first place.
So how does a lightning protection Mode Lightning Boats Aluminum Aluminum Boats Lightning Mode system work? In a boat, the "cage" is formed by bonding together, with heavy conductors, the vessel's mast and all other major metal masses. A marine electrician must tie in the engines, stoves, air conditioning compressors, railings, arches etc. It Aluminum Lightning Boats MoAluminum Boats Lightning Mode de is important that you ensure that your crew fall within the protection of the "cage," something not always feasible when the vessel is not built of steel or aluminum.
On NON ALLOY or wooden boats it is advantageous to Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode have a mast or other conductive metal protrusion extending well above the vessel, creating what is known as a "cone" or zone of protection. It is generally accepted that this cone of protection extends 45 degrees, all around, from the tip of the metal protrusion. This means that if the aluminum mast of the average sailing vessel is properly bonded to the vessel's other major metal masses and is given a direct, low-resistance conductive path to ground, the entire Aluminum Boats Lightning Mode boat should fall within the protected zone.
If the vessel has a wooden or composite mast, a marine electrician can achieve the same effect by installing a 6 to 12 inch metal spike at the top and running a heavy conductor down the mast and as directly as possible to ground, usually through the engine and propeller shaft. Again, refer to the ABYC standards and have a professional marine electrician install your lightning protection.
This is not a do-it-yourself project. All Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode rights reserved. Sponsor: International Marine Educators, Inc. Regards, Pete in Brisbane. Faraday was a brave individual and scientist.
I encourage everyone to look him up! Here is a brief description from Wikipedia: A Faraday cage or Faraday shield is an Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode enclosure formed by conducting material, or by a mesh of such material. Such an enclosure blocks out external static electrical fields.
Faraday cages are named after physicist Michael Faraday, who built one in An external static electrical field will cause Aluminum Boats Lightning Mode Aluminum Mode Boats Lightning Aluminum Boats Lightning Mode Aluminum Boats Lightning Mode the electrical charges within the conducting material to redistribute themselves so as to cancel the field's effects in the cage's interior. This effect is used, for example, to protect electronic equipment from lightning strikes and other electrostatic discharges.
What a guy! Read up, enjoy the history, and feel safe in your alloy boat! High tension wire maintainence by humans dropped off by helicopter onto the live wires protcted only by a stainless mesh suit acting as the faraday cage.
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