Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 32
  1. #1
    Go Yankees MI_rider's Avatar
    Join Date
    Apr 2003
    Location
    Clarkston, Michigan
    My Bikes
    Bianchi Volpe, Trek 2300
    Posts
    153
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Shocking experience

    I was at the LBS earlier today to test ride a couple of bikes. (Trek 2300 verus the 5200) I will save that for another thread. While I was there a guy comes in and asks one of the employees if he can ask him a strange question.

    The guy tells the employee that he has a Trek 4300. He bought it at the lbs about a month before. He says that when he and his family ride under the main power lines that he gets shocked on his bike but that nobody else (wife or kids) gets shocked. He says that he has to make sure he is only touching the rubber grips and the seat. He has to take his feet of the pedals and put his legs way out to the side so he doesn't touch any metal on the bike. He said that one time he didn't spread his legs wide enough and that he got shocked on his inner thigh becuase he was touching the saddle rails.

    After waiting long enough to ask with a straight face we asked a couple of questions. Did his wife try his bike? He tried to get her to but she refused. Did he ride through on her bike? No but he was going to try that tonight.

    He said that his old bike didn't do this and that this only happens when going under a certain spot of the main power lines that supply his area.

    Nobody there had ever heard of anything like this, so my question is has anyone out there ever heard of anything like this before? I tend to believe the guy because I don't think anyone could make up a story that good and then tell it with a straight face and demonstrate how he had to ride through the area to not get shocked. Any ideas on what could cause it?

    Steve

  2. #2
    山馬鹿 Spire's Avatar
    Join Date
    Feb 2002
    Location
    Fuchu, Tokyo, Japan
    My Bikes
    TREK 1000 and a junk bike with a basket on the front to go to the shops.
    Posts
    1,398
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The account has little basis in reality for several reasons. The first one is that the voltage and energy needed to brdige from powerlines to the ground is immense and likely not the be carried in the lines. In the event that there is enough and for some reason a shock will come out, it makes much more sense that the bolt will spark from wire to tower to get to the ground (always takes path of least resistance). Also, there is no direct ground connection on the bike, the wheels are made of rubber. This is why you are not really at risk in a car.

    I personally, knowing a lot about electricty (through engineering studies) find this account to be extremely unlikely and suspect that there must be another explanation, futher tests need to be done to prove anything conclusivly. Either way, it surely isn't the bike manufacturer's fault.
    http://www.cyclistsroadmap.com/eng/ - Cyclists' road map. Checkout which roads are good for cycling and rate roads in your area.

  3. #3
    DEADBEEF khuon's Avatar
    Join Date
    Aug 2002
    Location
    Catching his breath alongside a road near Seattle, WA USA
    My Bikes
    1999 K2 OzM, 2001 Aegis Aro Svelte
    Posts
    12,155
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Well, although unlikely that air between the powerlines and the rider/bike has undergone dialectric breakdown, the rider could be experiencing the effects of induction.
    1999 K2 OzM 2001 Aegis Aro Svelte OCP Club Member
    "Be liberal in what you accept, and conservative in what you send." -- Jon Postel, RFC1122

  4. #4
    Go Yankees MI_rider's Avatar
    Join Date
    Apr 2003
    Location
    Clarkston, Michigan
    My Bikes
    Bianchi Volpe, Trek 2300
    Posts
    153
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by Spire
    I personally, knowing a lot about electricty (through engineering studies) find this account to be extremely unlikely and suspect that there must be another explanation, futher tests need to be done to prove anything conclusivly. Either way, it surely isn't the bike manufacturer's fault.
    I know the basics about electricity and magnetism also.
    What makes this a funny story is trying to figure out what could be happening. Also nobody was trying to claim it was the fault of the manufacturer. I just thought it was a funny story that everyone would enjoy. I do believe this guy but just can't imagine what is causing the problem.

    khoun, I also think it has to be induction but I am not sure why it would affect just him and not the other riders. What is so different about his bike. I will have to get out my college physics book and try and figure this out.

  5. #5
    Scooby Snax
    Guest
    Only explanation could be induction, which is highly unlikely, as t he distance form the overhead transmission lines are specified to keep things like this from happening.


    Scoob

  6. #6
    DEADBEEF khuon's Avatar
    Join Date
    Aug 2002
    Location
    Catching his breath alongside a road near Seattle, WA USA
    My Bikes
    1999 K2 OzM, 2001 Aegis Aro Svelte
    Posts
    12,155
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by MI_rider

    khoun, I also think it has to be induction but I am not sure why it would affect just him and not the other riders. What is so different about his bike. I will have to get out my college physics book and try and figure this out.
    I'm grasping at straws here... Metal content of his bike might be different than previous bikes or other rider's bikes? Conductivity of his skin due to sweat content/water content of his body may cause him to draw the charge off the bike whereas others wouldn't?
    1999 K2 OzM 2001 Aegis Aro Svelte OCP Club Member
    "Be liberal in what you accept, and conservative in what you send." -- Jon Postel, RFC1122

  7. #7
    Senior Member Bobatin's Avatar
    Join Date
    Oct 2002
    Location
    Newnan, GA
    Posts
    402
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Conductivity of carbon tires? He would have to be passing through in the middle of two towers.

    Take a flourescent light bulb under those power lines at night and it will glow like a light saber.
    So, if you're in the car, waiting impatiently. . . get over it - you're not that special.
    "Its not what you take when you leave, Its what you leave when you go."
    Some country and western song

  8. #8
    Are we having fun yet? Prosody's Avatar
    Join Date
    Oct 2002
    Location
    Chesterfield, Missouri
    My Bikes
    Fuji Roubaix, Trek 7200
    Posts
    930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Actually, I have had the same thing happen to me, though not as dramatically. On most of my rides I pedal under high-tension transmission lines, and I have noticed that, when I tap my fingers against the brake levers on my hybrid--havn't noticed this on the road bike yet--I get mild shocks. I have heard that high-tension transmission lines can create an electromagnetic field.
    You're east of East St. Louis
    And the wind is making speeches.

  9. #9
    Almost Immortal The Rob's Avatar
    Join Date
    Mar 2002
    Location
    Portland, Oregon
    My Bikes
    2004 Trek 7500FX
    Posts
    820
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Could it be simply static electricity? Perhaps this fellow was creating friction somehow, say between his clothing and the saddle. If subsequently he moved his body in a certain way that caused his skin to come into contact with the frame (steering through an obstacle or bracing for a bump, etc.), could he not sustain a shock? This possibility assumes that he must move in much the same manner every time he passes that spot.

    Straws? I gots a handful. :confused:

    -Rob
    "Ignorance begets confidence more frequently than does knowledge." -Charles Darwin


    http://blog.myspace.com/robcatg

    http://therob.wordpress.com

  10. #10
    Almost Immortal The Rob's Avatar
    Join Date
    Mar 2002
    Location
    Portland, Oregon
    My Bikes
    2004 Trek 7500FX
    Posts
    820
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by Prosody
    ...I have noticed that, when I tap my fingers against the brake levers on my hybrid--havn't noticed this on the road bike yet--I get mild shocks...
    Heck, maybe it's an alloy thingie. Steel vs. aluminum? (Like that argument needs yet another facet!)

    -Rob
    "Ignorance begets confidence more frequently than does knowledge." -Charles Darwin


    http://blog.myspace.com/robcatg

    http://therob.wordpress.com

  11. #11
    Are we having fun yet? Prosody's Avatar
    Join Date
    Oct 2002
    Location
    Chesterfield, Missouri
    My Bikes
    Fuji Roubaix, Trek 7200
    Posts
    930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I do know it isn't static electricity because it happens only under the power lines. Steel vs. aluminum? Hmmm... The hybrid frame is aluminum. I'm not sure what metal the brake levers are.
    You're east of East St. Louis
    And the wind is making speeches.

  12. #12
    Email for new group DnvrFox's Avatar
    Join Date
    Aug 2001
    Location
    Send email to dnvrfox@aol.com for new group
    Posts
    20,883
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Research: Power lines enhance static electricity, creating "positive static electricity"

    ‘Positive Static Electricity’

    http://www.justlogiclifescience.com.au/powerlines.html

    Also

    Don't VanDeGraaff generators cause static electricity by the electromagnetic field they cause?

    Seems to me this is a viable explanation, also dependent upon the tires and material of the bike, and the dryness of the person.
    Gone - email me at dnvrfox@aol.com for new group of old 50+ folks

  13. #13
    aka old dog greywolf's Avatar
    Join Date
    Oct 2002
    Location
    tauranga New Zealand
    Posts
    1,173
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by DnvrFox
    Research: Power lines enhance static electricity, creating "positive static electricity"

    ‘Positive Static Electricity’

    http://www.justlogiclifescience.com.au/powerlines.html

    Also

    Don't VanDeGraaff generators cause static electricity by the electromagnetic field they cause?

    Seems to me this is a viable explanation, also dependent upon the tires and material of the bike, and the dryness of the person.
    This could be true , if you walk through a power transmission switching yard on a high humidity day ,you can feel the electricity in the air ,your hair starts to stand on end & if your wearing wool ,it starts to stand on end too, may be this guy is more sensative to electricity
    :D
    dont worry be happy ????

  14. #14
    Senior Member joeprim's Avatar
    Join Date
    Jan 2002
    Location
    Northern Neck Tidewater Va.
    Posts
    1,688
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Wow

    Yes induction and yes more sensitive person sweat or more dry ???

    Yes to EM field

    But some how to get a shock there has to be a potential (voltage) difference. This makes me think that the tires must conduct

    Van de graph humm
    The bike being insulated from the ground, but a good conductor gets a charge the rider doesn't so there is a difference but where is the flow???

    Neat post thanks

    Joe

  15. #15
    Are we having fun yet? Prosody's Avatar
    Join Date
    Oct 2002
    Location
    Chesterfield, Missouri
    My Bikes
    Fuji Roubaix, Trek 7200
    Posts
    930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Of course, in the college physics lab we used a rubber mat and the business end of a VanDeGraaff generator to play wizard--build up a charge and with the index finger zap a passerby from a distance of about three feet.
    You're east of East St. Louis
    And the wind is making speeches.

  16. #16
    Email for new group DnvrFox's Avatar
    Join Date
    Aug 2001
    Location
    Send email to dnvrfox@aol.com for new group
    Posts
    20,883
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Drive under high power lines while your car radio is turned to a weak AM station to get some kind of an idea of the extensive EM field being generated.
    Gone - email me at dnvrfox@aol.com for new group of old 50+ folks

  17. #17
    Email for new group DnvrFox's Avatar
    Join Date
    Aug 2001
    Location
    Send email to dnvrfox@aol.com for new group
    Posts
    20,883
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by joeprim

    But some how to get a shock there has to be a potential (voltage) difference. This makes me think that the tires must conduct

    but where is the flow???

    Joe
    Same place the flow is with a lightning strike. Non-existent until the charge releases because of the potential difference.
    Gone - email me at dnvrfox@aol.com for new group of old 50+ folks

  18. #18
    The Red Lantern Rev.Chuck's Avatar
    Join Date
    Apr 2003
    Location
    Raleigh NC
    Posts
    5,967
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    This is not, by a longshot, my speciality, but wouldn't induction require ferrous metal?
    Is itnotalso possible that the guy is a little off? I have a customer that believes that loosening the adjusting screws on her rear der. makes the bike faster even tho I have shown her exactly what they do.
    Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
    Help out the forums, abide by our community guidelines.

    I am in the woods and I have gone crazy.

  19. #19
    Look Ma, NO hands!
    Join Date
    Oct 2002
    Location
    UC Tennessee
    Posts
    987
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Personal experence talking here! We use to shoot .22 rimfire *****s off the side of a bridge in the country here that had a high power electric towers running over head. One day I noticed that my ***** was shocking me when I touched the trigger guard just before shooting. I could actually hold the *** by the plastic stock, inch my finger twards any metal part of the *** and a small arch would appear with a tingling shock, so the fella isn't tellin a big one!
    After this experence I would not want to live close to one of those, it would be like living with your microwave door open all the time! I also have a friend who works for TVA as a lineman doing helocopter line checks and in the air repairs and I can tell you that there are instruments that can detect when a insulator is going bad just by the field around it. Why do you think those lines have to be so far from anything metal? He says that if you get closer than 5 ft of one of the lines, you will become the path of least resistance to the ground and ZAP! You just became a poodle in the microwave!

  20. #20
    N_C
    N_C is offline
    Banned. N_C's Avatar
    Join Date
    Oct 2002
    Location
    Bannation, forever.
    Posts
    2,887
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    First of all yes this can and does happen. More ofthen then people may think.

    Why? Well I really don't know. It could be because of static electricity in the area or the power lines are faulty for some reason or another. Maybe its because certain people conduct electricity better then others.

    What ever the reason the shocking experience can be and is surprising to say the least and can be painful at worst.

    It has happened to me, once.

    It was a long time ago during the 2nd day of a Iowa MS150 ride. I do not remember what county highway I was on but it did happen.

    At first I thought I was imaginning it. But 2 other cyclists next to me had the same experience.

    It was while we rode under some high powered electrical lines. We just got a brief static shock.

    The thing is we felt it all the way through our bodies. It was actually kind o weird.

    When we got to the end of the ride we reported it to a county sheriff. Hopefully the problem was dealt with before someone got seriously hurt by it.

  21. #21
    hateful little monkey jim-bob's Avatar
    Join Date
    May 2003
    Location
    oakland, ca
    Posts
    5,274
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by Rev.Chuck
    I have a customer that believes that loosening the adjusting screws on her rear der. makes the bike faster even tho I have shown her exactly what they do.
    It doesn't? I thought my plan was foolproof!

  22. #22
    Go Yankees MI_rider's Avatar
    Join Date
    Apr 2003
    Location
    Clarkston, Michigan
    My Bikes
    Bianchi Volpe, Trek 2300
    Posts
    153
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by Rev.Chuck
    This is not, by a longshot, my speciality, but wouldn't induction require ferrous metal?
    For induction you just need any material that will conduct electricity. Copper is what is commonly used and it is not ferrous

    Originally posted by Rev.Chuck
    Is itnotalso possible that the guy is a little off? I have a customer that believes that loosening the adjusting screws on her rear der. makes the bike faster even tho I have shown her exactly what they do.
    I guess that is why I started the thread was to see if anyone else had ever heard of anything similiar. I believed the guy but since I didn't know him I wasn't sure. I guess that it happens more than I realized.

    My best guess for what is happening is that he really has two complete loops on the bike. The bike frame and the cables that on his bike run across the top of the bike. They are probably seperated by some kind of insulater (plastic spacers). Since the cables are steel and the frame is aluminum when it passes through the magnetic field generated by the lines it will create two differnt flows in the two different metals. Thus the potential difference and the shock when he completes the circuit between the two. Of course we would have to hook the bike up to volt meters to verify this but it is my best guess.

    Thanks for all of the responses.

    Steve

    .

  23. #23
    Look Ma, NO hands!
    Join Date
    Oct 2002
    Location
    UC Tennessee
    Posts
    987
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My guess is that he is absorbing the electrons, and when he makes contact with the metal of the frame it results in a shock, as the electrons flow to ground.

    I have heard of cases where people have been convicted of theft by running an insulated wire paralell with the hv lines and capturing this "bleed off" electricity.

  24. #24
    Mr. Cellophane RainmanP's Avatar
    Join Date
    Nov 2000
    Location
    New Orleans, LA
    Posts
    3,037
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by Prosody
    Of course, in the college physics lab we used a rubber mat and the business end of a VanDeGraaff generator to play wizard--build up a charge and with the index finger zap a passerby from a distance of about three feet.
    This is what I was thinking, that in the highly charged region under the power line it wouldn't take much for a static charge to arc the 2-3 cm from the rim to the ground
    If it ain't broke, mess with it anyway!

  25. #25
    Senior Member Bobatin's Avatar
    Join Date
    Oct 2002
    Location
    Newnan, GA
    Posts
    402
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    So if this guy grounded himself to the frame while passing under the power lines he would not get shocked?
    So, if you're in the car, waiting impatiently. . . get over it - you're not that special.
    "Its not what you take when you leave, Its what you leave when you go."
    Some country and western song

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •