|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Bicycle Theft increasing - UK film short
Bicycle Theft exploding as does bicycle ownership goes up...
Easy rechargeable seat GPS trackers? Daniel Westrop given a 6 month suspended sentence for 100+ bicycle thefts seems a bit light. http://www.youtube.com/watch?v=rhPzF...eature=related |
Ads |
#2
|
|||
|
|||
Bicycle Theft increasing - UK film short
Per Postman Delivers:
Daniel Westrop given a 6 month suspended sentence for 100+ bicycle thefts seems a bit light. http://www.youtube.com/watch?v=rhPzF...eature=related Sounds like a real slap in the face for the London cops. -- Pete Cresswell |
#3
|
|||
|
|||
Bicycle Theft increasing - UK film short
On 10 Jan 2012 17:08:23 GMT, Postman Delivers
wrote: Bicycle Theft exploding as does bicycle ownership goes up... Easy rechargeable seat GPS trackers? Daniel Westrop given a 6 month suspended sentence for 100+ bicycle thefts seems a bit light. http://www.youtube.com/watch?v=rhPzF...eature=related The problem seems to be epidemic and contageous: "Police deal with surge of bike thefts in Santa Cruz" http://www.santacruzsentinel.com/ci_19715876 An explosive device under the saddle, detonated by a garage door opener remote, might be entertaining. I wonder if a saddle, with padding and frame pre-sliced for optimum fragmentation, might sell. Probably too dangerous for bystanders. I guess a mini-nail gun, pointed up through the saddle, will suffice. The problem with a GPS tracker, is what are you going to do if you find the thieves? Are you going to rush in, confront a group of street scum, grab the bicycle, and try to ride away? I don't think you're going to make it out the door. You could call the police, who will confiscate your bicycle as evidence if there's an arrest. Chances are fairly good that the bicycle will evaporate. That's happening locally with alarming frequency. Of course, you do carry sufficient documentation with you to prove that it's really your bicycle. (Register it with the city and have photographs handy). -- # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060 # 831-336-2558 # http://802.11junk.com # http://www.LearnByDestroying.com AE6KS |
#4
|
|||
|
|||
Bicycle Theft increasing - UK film short
On 12/01/12 13:47, Jeff Liebermann wrote:
On 10 Jan 2012 17:08:23 GMT, Postman Delivers wrote: Bicycle Theft exploding as does bicycle ownership goes up... Easy rechargeable seat GPS trackers? Daniel Westrop given a 6 month suspended sentence for 100+ bicycle thefts seems a bit light. http://www.youtube.com/watch?v=rhPzF...eature=related The problem seems to be epidemic and contageous: "Police deal with surge of bike thefts in Santa Cruz" http://www.santacruzsentinel.com/ci_19715876 An explosive device under the saddle, detonated by a garage door opener remote, might be entertaining. I wonder if a saddle, with padding and frame pre-sliced for optimum fragmentation, might sell. Probably too dangerous for bystanders. I guess a mini-nail gun, pointed up through the saddle, will suffice. If the saddle top could be insulated from the rails, then the use of a metalised foil on the seat as the return point for an electrified frame might also prove entertaining. Trouble is, with so much CFRP and hard anodised Al on the bikes these days, even electrification wouldn't work in all cases. But where it does, a 10 - 15 kV jolt from a car coil discharged through the rectum would, erm, purse their lips ;-) -- JS. |
#5
|
|||
|
|||
Bicycle Theft increasing - UK film short
On Thu, 12 Jan 2012 16:01:08 +1100, James
wrote: If the saddle top could be insulated from the rails, then the use of a metalised foil on the seat as the return point for an electrified frame might also prove entertaining. That might work, but you would also need to make the rubber bar end grips more conductive. Also, if you draw an arc through the saddle, it will probably burn a hole in the seat. It might be awkward to build such a device on a conventional bicycle, but the motorized variety have a very convenient power source available to provide the necessary zap. Trouble is, with so much CFRP and hard anodised Al on the bikes these days, even electrification wouldn't work in all cases. A few thousand volts will blast right through the alodine 1200 plated aluminum. But where it does, a 10 - 15 kV jolt from a car coil discharged through the rectum would, erm, purse their lips ;-) Yep. However, I'm thinking that the insulated rubber bar end grips might offer a better opportunity. Delivering the jolt between the hands will go through the heart, and probably kill the bicycle thief. If you want to be really evil, use DC instead of AC. That will make the muscles contract, resulting in a death grip on the grips. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#6
|
|||
|
|||
Bicycle Theft increasing - UK film short
Jeff Liebermann wrote:
On Thu, 12 Jan 2012 16:01:08 +1100, wrote: If the saddle top could be insulated from the rails, then the use of a metalised foil on the seat as the return point for an electrified frame might also prove entertaining. That might work, but you would also need to make the rubber bar end grips more conductive. Also, if you draw an arc through the saddle, it will probably burn a hole in the seat. It might be awkward to build such a device on a conventional bicycle, but the motorized variety have a very convenient power source available to provide the necessary zap. Trouble is, with so much CFRP and hard anodised Al on the bikes these days, even electrification wouldn't work in all cases. A few thousand volts will blast right through the alodine 1200 plated aluminum. But where it does, a 10 - 15 kV jolt from a car coil discharged through the rectum would, erm, purse their lips ;-) Yep. However, I'm thinking that the insulated rubber bar end grips might offer a better opportunity. Delivering the jolt between the hands will go through the heart, and probably kill the bicycle thief. If you want to be really evil, use DC instead of AC. That will make the muscles contract, resulting in a death grip on the grips. FWIW, I disassembled a cheap old film camera and saved the flash electronics circuit. I found that the voltage from two AA batteries gets pumped up to 300 volts in a large capacitor. The circuit probably weighs less than two ounces. 300 volts properly applied ought to tingle, at least! -- - Frank Krygowski |
#7
|
|||
|
|||
Bicycle Theft increasing - UK film short
On 12/01/12 18:22, Jeff Liebermann wrote:
On Thu, 12 Jan 2012 16:01:08 +1100, wrote: If the saddle top could be insulated from the rails, then the use of a metalised foil on the seat as the return point for an electrified frame might also prove entertaining. That might work, but you would also need to make the rubber bar end grips more conductive. Throw in a few handfuls of carbon to the rubber mix ;-) Also, if you draw an arc through the saddle, it will probably burn a hole in the seat. It might be awkward to build such a device on a conventional bicycle, but the motorized variety have a very convenient power source available to provide the necessary zap. Trouble is, with so much CFRP and hard anodised Al on the bikes these days, even electrification wouldn't work in all cases. A few thousand volts will blast right through the alodine 1200 plated aluminum. Alodine is a conductive coating. An anodized Al is non conductive, but yes, enough voltage will go through. http://www.finishing.com/448/95.shtml But where it does, a 10 - 15 kV jolt from a car coil discharged through the rectum would, erm, purse their lips ;-) Yep. However, I'm thinking that the insulated rubber bar end grips might offer a better opportunity. Delivering the jolt between the hands will go through the heart, and probably kill the bicycle thief. If you want to be really evil, use DC instead of AC. That will make the muscles contract, resulting in a death grip on the grips. I like your thinking. I was just going with the small battery and automotive coil and relay contacts driven by a 555 timer perhaps. A crude electric fence. Metalised hand grips would be the go. -- JS. |
#8
|
|||
|
|||
Bicycle Theft increasing - UK film short
On 13/01/12 05:32, Frank Krygowski wrote:
Jeff Liebermann wrote: On Thu, 12 Jan 2012 16:01:08 +1100, wrote: If the saddle top could be insulated from the rails, then the use of a metalised foil on the seat as the return point for an electrified frame might also prove entertaining. That might work, but you would also need to make the rubber bar end grips more conductive. Also, if you draw an arc through the saddle, it will probably burn a hole in the seat. It might be awkward to build such a device on a conventional bicycle, but the motorized variety have a very convenient power source available to provide the necessary zap. Trouble is, with so much CFRP and hard anodised Al on the bikes these days, even electrification wouldn't work in all cases. A few thousand volts will blast right through the alodine 1200 plated aluminum. But where it does, a 10 - 15 kV jolt from a car coil discharged through the rectum would, erm, purse their lips ;-) Yep. However, I'm thinking that the insulated rubber bar end grips might offer a better opportunity. Delivering the jolt between the hands will go through the heart, and probably kill the bicycle thief. If you want to be really evil, use DC instead of AC. That will make the muscles contract, resulting in a death grip on the grips. FWIW, I disassembled a cheap old film camera and saved the flash electronics circuit. I found that the voltage from two AA batteries gets pumped up to 300 volts in a large capacitor. The circuit probably weighs less than two ounces. 300 volts properly applied ought to tingle, at least! 300 V through sweaty hands and backside would certainly give you an alert. The reason they use capacitors in a camera flash is to store a precise amount of charge (and voltage, q = C V) for an indefinite time, that can be fired at precisely the moment the shutter is opened. An ignition coil is less precise in the stored charge department (at least it was when points were still used). The stored energy grows while the points are closed, until the flux in the magnetic core is saturated, and released when the points open and the magnetic field collapses. Once the core is saturated the current just heats the coil and wastes power. The voltage is a little unpredictable, but much higher than 300 V. Typically thousands of volts. The energy depends on the time the points are closed, the quality of the magnetic core and the resistance of the circuit. -- JS. |
#9
|
|||
|
|||
Bicycle Theft increasing - UK film short
On 1/12/2012 1:32 PM, Frank Krygowski wrote:
Jeff Liebermann wrote: On Thu, 12 Jan 2012 16:01:08 +1100, wrote: If the saddle top could be insulated from the rails, then the use of a metalised foil on the seat as the return point for an electrified frame might also prove entertaining. That might work, but you would also need to make the rubber bar end grips more conductive. Also, if you draw an arc through the saddle, it will probably burn a hole in the seat. It might be awkward to build such a device on a conventional bicycle, but the motorized variety have a very convenient power source available to provide the necessary zap. Trouble is, with so much CFRP and hard anodised Al on the bikes these days, even electrification wouldn't work in all cases. A few thousand volts will blast right through the alodine 1200 plated aluminum. But where it does, a 10 - 15 kV jolt from a car coil discharged through the rectum would, erm, purse their lips ;-) Yep. However, I'm thinking that the insulated rubber bar end grips might offer a better opportunity. Delivering the jolt between the hands will go through the heart, and probably kill the bicycle thief. If you want to be really evil, use DC instead of AC. That will make the muscles contract, resulting in a death grip on the grips. FWIW, I disassembled a cheap old film camera and saved the flash electronics circuit. I found that the voltage from two AA batteries gets pumped up to 300 volts in a large capacitor. The circuit probably weighs less than two ounces. 300 volts properly applied ought to tingle, at least! You could, such circuits have been cheaply available for decades. I think some have been used for motorcycle anti-theft home brews. In reality, it wouldn't work well enough to actually deter theft, would risk the accidental shocking of innocents, and expose you to significant liability if you put a thief into cardiac arrest. Not to mention the times you'd likely shock yourself. |
#10
|
|||
|
|||
Bicycle Theft increasing - UK film short
On 1/12/2012 5:24 PM, James wrote:
On 13/01/12 05:32, Frank Krygowski wrote: Jeff Liebermann wrote: On Thu, 12 Jan 2012 16:01:08 +1100, wrote: If the saddle top could be insulated from the rails, then the use of a metalised foil on the seat as the return point for an electrified frame might also prove entertaining. That might work, but you would also need to make the rubber bar end grips more conductive. Also, if you draw an arc through the saddle, it will probably burn a hole in the seat. It might be awkward to build such a device on a conventional bicycle, but the motorized variety have a very convenient power source available to provide the necessary zap. Trouble is, with so much CFRP and hard anodised Al on the bikes these days, even electrification wouldn't work in all cases. A few thousand volts will blast right through the alodine 1200 plated aluminum. But where it does, a 10 - 15 kV jolt from a car coil discharged through the rectum would, erm, purse their lips ;-) Yep. However, I'm thinking that the insulated rubber bar end grips might offer a better opportunity. Delivering the jolt between the hands will go through the heart, and probably kill the bicycle thief. If you want to be really evil, use DC instead of AC. That will make the muscles contract, resulting in a death grip on the grips. FWIW, I disassembled a cheap old film camera and saved the flash electronics circuit. I found that the voltage from two AA batteries gets pumped up to 300 volts in a large capacitor. The circuit probably weighs less than two ounces. 300 volts properly applied ought to tingle, at least! 300 V through sweaty hands and backside would certainly give you an alert. The reason they use capacitors in a camera flash is to store a precise amount of charge (and voltage, q = C V) for an indefinite time, that can be fired at precisely the moment the shutter is opened. An ignition coil is less precise in the stored charge department (at least it was when points were still used). The stored energy grows while the points are closed, until the flux in the magnetic core is saturated, and released when the points open and the magnetic field collapses. Once the core is saturated the current just heats the coil and wastes power. The voltage is a little unpredictable, but much higher than 300 V. Typically thousands of volts. The energy depends on the time the points are closed, the quality of the magnetic core and the resistance of the circuit. Almost all modern ignitions use a charged capacitor discharging through the ignition coil. The switching is done with a solid state device. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Early bicycle theft | [email protected] | Techniques | 0 | January 12th 10 04:14 AM |
Short film (with unicycle) for apple film festival - please rate! | Jester2000 | Unicycling | 13 | December 6th 06 09:59 PM |
{CAN} Celluloid Cycles - Short Film fest | Poiter | Australia | 0 | June 7th 06 02:20 AM |
Bicycle theft | Leo Lichtman | General | 17 | May 28th 06 11:14 PM |
Bicycle Theft Detterent | help | UK | 6 | August 28th 03 11:32 AM |