Possible lightening strike

Status
Not open for further replies.
D

Douglas Miles

What are the typical effects seen from a lightening strike to the mast? I first thought that my 260 (dry-docked) had been vandalized when I saw the running light lenses on the ground. One of the bulbs was missing and the other was burned out. One of the conductors was also broke (or burned) off at the spade connector. Upon replacing bulbs and repairing wires I discovered that several of the circuit breakers were tripped. Then I discovered that the VHF radio didn't work - the fuse was blown and the antenna is warped. I'm guessing a small (is that possible?) lightening strike occurred because the 110 VAC plug 2' from the boat was also out. Has anyone had similar experiences? What other problems do I need to look for? Mechanical Doug
 
R

Ray Bowles

I think you are on track describing a lightening

strike. The electronics will probably be fused in little puddles of metal. If the mast was raised there will probably be damage there. If the mast was down what are the chances the lightening strike entered from the shore power cord end? Is there damage where the boat or trailer goes to ground and around where the bolt exited the boat. Time for the insurance man. Ray S/V Speedy
 
J

John

Struck

My 25.5 Hunter was struck a few years ago. Many of the same isues and more. The main grounding wire from mast to keel was turned intoplasma - only a black streak remained. Every fuse was blown and a number of the main electrical circuit wires were either melted (insulation, that is) or had also become black streaks. The mast top VHS ant was obliterated, but the ant wire survived. My speed log was fried along with one electric water pump and my VHS. Another pump, all lights with my engine wiring and batteries survived. The heat/plasma effect also blew out portions of the teak and holly flooring, knocked cushions everywhere, and melted some plastic swim floats stored under the V berth. The electricity exited the boat around the waterline. That created 10 holes the size of a quarter and thousands of small pin holes. Luckily, the exits were clean and there was no delamination of consequence. Around the exit points (holes) ther were often little branching patterns that indicated the electrical paths. The overall look of thewaterline was what you might expect if someone inside your boat decided to start blasting away at the hull with a shotgun. I would look closely for any hull damage around the waterline - pin hole in size -and any indications of electrical pathways (exits). Another boat close to mine was struck at the same time. He experienced a total burn through of some "packing material" which was used to fill a trunk space over the keel. The keel ended up quite wobbly from lack of support. He also had some indications of heat near his chain plates and a little pitting in the threads of his turnbuckles. Might want to take a close look at these to make sure they were not impacted.
 
D

Douglas Miles

Further checking

The mast was up and the boat was on the trailer. Many of the clasps on the lifelines show marks from arcing and attempted fusing. I think the VHF is dead. It blows fuses even while turned off. Still determining what else was affected. Didn't see the exit point(s). They are probably under the bunk boards & keel. Taking her out today and will probably discover more uh-oh's. So far I know the batteries & charger, lights, water-pump and stereo seem to be functioning fine. I have been worried about strikes while in the water but thought that the electrical resistance would be too high while sitting on the trailer in close proximity to taller trees. I guess you are never safe from nature! Doug
 
C

Crazy Dave Condon

other items

It sounds like you got hit but not direct. The obvious is of course any electrical items and if you have instruments and so forth, normally they will be fried. You will need to check your inline fuse on the positeve side or red wire which you will usually find appx. 1 foot away from the battery. Also, you need to check all thru hull fittings as electricity has to find a way out and if any sign, replace them as needed. Crazy Dave Condon
 
Status
Not open for further replies.