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RF Safe-Stop lethal to motorcyclists?

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DrSnoosnoo
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PostPosted: 17:38 - 04 Dec 2013    Post subject: Re: RF Safe-Stop lethal to motorcyclists Reply with quote

_Iain_ wrote:
Think the H100's safe with it's carburettor and points ignition Laughing


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G
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PostPosted: 17:49 - 04 Dec 2013    Post subject: Re: RF Safe-Stop lethal to motorcyclists? Reply with quote

I also found it on BCF Wink.
https://www.bikechatforums.com/viewtopic.php?t=282177&highlight=
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Suntan Sid
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PostPosted: 18:21 - 04 Dec 2013    Post subject: Reply with quote

There are so many potential problems with ever using one on a public road, it will never see the light of day!
It's a compo claim waiting to happen!
It's claimed they could be used in a "chase" situation.
It's highly unlikely the device could be mounted in a motorised vehicle for obvious reasons, which means a static location.

If the device can't be mounted in vehicle, then at, realistic, chase speeds, (say 70 to 100mph+), and given the fact that the range is 50m, surely the vehicle being chased would just disengage the clutch when it's within the 50m "ray gun" zone, freewheel through the "death ray" then bump it back into life, once out of range, and carry on in the lead!

If the device could be mounted in a vehicle, then surely if the vehicle being chased had the same sheilding as the pursuer, (preventing self destruction), then the technology is useless!
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iooi
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PostPosted: 18:33 - 04 Dec 2013    Post subject: Re: RF Safe-Stop lethal to motorcyclists? Reply with quote

_Iain_ wrote:
it's more the thought process that comes up with "if my engine cuts out my back wheel will lock up & I will die because the ABS wont fix it for me"


Clearly people who have never had the ignition cut out..... Rolling Eyes
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nowhere.elysium
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PostPosted: 18:47 - 04 Dec 2013    Post subject: Re: RF Safe-Stop lethal to motorcyclists? Reply with quote

_Iain_ wrote:
"if my engine cuts out my back wheel will lock up & I will die because the ABS wont fix it for me"
Clearly you need to master the subtle art of pulling the clutch in.
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andym
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PostPosted: 19:13 - 04 Dec 2013    Post subject: Reply with quote

I was going to make a comment about the Glasgow helicopter crash.... and how an eye witness claimed the engine 'cut out'.... but I won't
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stinkwheel
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PostPosted: 19:44 - 04 Dec 2013    Post subject: Reply with quote

andym wrote:
I was going to make a comment about the Glasgow helicopter crash.... and how an eye witness claimed the engine 'cut out'.... but I won't

Helicopters do not crash when the engine cuts out any more than motorcycles do.

What WOULD be dangerous is if it made a motorcycle engine intermittantly cut out. Such a system would want to be all the way off or nothing. Most peoples (people who never owned a peaky 2-stroke in any case) immediate reaction to the engine dying under them is to wind the throttle open some more. If you did that on a powerful bike and it kicked back in again, you could land up flipping it.
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Matt B
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PostPosted: 21:03 - 04 Dec 2013    Post subject: Reply with quote

As mentioned in the other thread - the thing itself is massive and hardly portable. Looks to be about 4 feet tall and 10 feet long! Needs an Ikea wooden trestle just to hold up its comedy nose cone.

Never going to see the light of day in that form as a viable method of stopping anything.

https://www.e2v.com/e2v/assets/Image/RF%20Safe-Stop/letter%20box%20trial%20set%20up.jpg
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Wonko The Sane
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PostPosted: 21:08 - 04 Dec 2013    Post subject: Reply with quote

anyone pointed out the lack of steering due to the power assisted steering stopping when the engine cuts?
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Derivative
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PostPosted: 21:08 - 04 Dec 2013    Post subject: Reply with quote

Why focus specifically on bikes?

It's not clear that killing a modern car's electronic systems from 70mph will be in any way safe, either.

Their 'test' was at 15mph.
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Rogerborg
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PostPosted: 21:53 - 04 Dec 2013    Post subject: Reply with quote

Discussed elsewhere. It's a HERF gun, you can find how-tos on the intardtubes if you want to make your own from a microwave, and a heck of a lot smaller than that beast.

No half sane Chief Cunstable would buy one, unless his brother-in-law was selling it, or they offer a hefty discount to the police retirement fund.
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Vracktal
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PostPosted: 22:39 - 04 Dec 2013    Post subject: Reply with quote

Black Sheep wrote:
anyone pointed out the lack of steering due to the power assisted steering stopping when the engine cuts?


Or the lack of power-assisted brakes? I know from experience my Volvo stops like a hound on a slippery floor when it loses brake system pressure.

Also, what's to stop people building a faraday cage around their ECU and thereby immunizing their bike/car against this? All you need is the mesh from the window of a microwave and the skills to shape it into a box that can wrap around the computer.
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Wonko The Sane
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PostPosted: 23:07 - 04 Dec 2013    Post subject: Reply with quote

Vracktal wrote:
Black Sheep wrote:
anyone pointed out the lack of steering due to the power assisted steering stopping when the engine cuts?


Or the lack of power-assisted brakes? I know from experience my Volvo stops like a hound on a slippery floor when it loses brake system pressure.

Also, what's to stop people building a faraday cage around their ECU and thereby immunizing their bike/car against this? All you need is the mesh from the window of a microwave and the skills to shape it into a box that can wrap around the computer.


Or just bosh it in an old microwave...
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ninja_butler
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PostPosted: 00:42 - 05 Dec 2013    Post subject: Reply with quote

I see the value of my 1980 Honda XL with it's neanderthal electrics going up in the near future..
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Jim Mc
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PostPosted: 06:18 - 05 Dec 2013    Post subject: Reply with quote

Couldn't you just shield your ECU from the RF? I don't get how this works actually because most car ECUs are shielded? Maybe they've started putting ecus into plastic boxes, but certainly on Meganes/Clios/Puntos and Daewoos they've all been inside of a metal faraday shroud.
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smegballs
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PostPosted: 08:43 - 05 Dec 2013    Post subject: Reply with quote

Jim Mc wrote:
Couldn't you just shield your ECU from the RF? I don't get how this works actually because most car ECUs are shielded? Maybe they've started putting ecus into plastic boxes, but certainly on Meganes/Clios/Puntos and Daewoos they've all been inside of a metal faraday shroud.


With my somewhat patchy knowledge of RF electricals (self-taught as radio ham), the cars wiring would act as an antenna and pick up the RF. The RF current then travels down the wiring to interact with the ECU.

As the RF voltages in the wire will be pretty high frequencies, it should be possible to use low-pass-filters and/or diplexers to keep the RF out of the ECU, plus a lot of de-coupling on the power supply to the ECU to short out and RF voltage between chassis earth and the ignition controlled live.
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iooi
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PostPosted: 10:39 - 05 Dec 2013    Post subject: Reply with quote

Quote:
It said it believed the primary use would be as a non-lethal weapon for the military to defend sensitive locations from vehicles refusing to stop.


I wonder just how many people who have posted the drawbacks if you are in the vehicle. Have actually read the article and its intended purpose.

TBH. Whats wrong with a simple Anti Tank Missile..... Rolling Eyes
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smegballs
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PostPosted: 10:45 - 05 Dec 2013    Post subject: Reply with quote

iooi wrote:


TBH. Whats wrong with a simple Anti Tank Missile..... Rolling Eyes


Or a fuckin' forty mike mike.

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G
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PostPosted: 11:59 - 05 Dec 2013    Post subject: Reply with quote

I suspect the sort of people going to that sort of trouble to protect against eventualities also aren't likely to be the sort being caught by the police Smile.
If the police did end up with a system like this, I'd expect it'd be used to stop joy-riders, ram raiders and the like.
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Skudd
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PostPosted: 12:06 - 05 Dec 2013    Post subject: Reply with quote

Just like road spikes, it will be used in limited situation and have a limited affect. Just another tool in the box to use.
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ninja_butler
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PostPosted: 12:09 - 05 Dec 2013    Post subject: Reply with quote

G wrote:
I suspect the sort of people going to that sort of trouble to protect against eventualities also aren't likely to be the sort being caught by the police Smile.
If the police did end up with a system like this, I'd expect it'd be used to stop joy-riders, ram raiders and the like.


Electronics technology moves on very fast, I think in five years time the current prototype unit will be the size of a microwave oven - small enough to install in a police car. I can also envision a system where every new car is fitted with some kind of receiver/transmitter that allows the vehicle's computer to be switched off remotely. The car scrappage scheme has taken a lot of old cars off the road too.
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chris-red
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PostPosted: 12:16 - 05 Dec 2013    Post subject: Reply with quote

Can't work out why people are moaning about this. Currently the alternative is bursting your tyres with fucking spikes. Laughing
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