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Old 09-22-2004, 10:52 AM   #11
christian_gates
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Default Re: 205MPH on a CBR 1000RR?

I believe that the timing strips on the highway are 1/4 mile apar - correct me if this is wrong, but it's only somewhat relevant to my point.



At very high speeds, unless the points used for measurement are very far apart, you'll need some fairly precise timing to get an accurate reading. Let's assume my 1/4 mile for discussion purposes. At 60 MPH, this distance takes 15 seconds to traverse. At 90 MPH, it takes 10 seconds. We're still within the realm of reason. At 180 MPH, though we're down to five seconds and small timing increments have dramatic impacts. One-half seconds less time will give you a reading of 200 MPH, while one-half second more will yield 164 MPH. While the difference between 180 and 165 and 200, from a legal point of view, is probably irrelevant, measurements become more error prone the finer they have to be.



I doubt parallax had much to do with this, as the measurement points would be almost adjacent to the bike (painted marks on the highway). If the measurements were far from the bike, then parallax with a moving observer would be more of an issue.



My ultimate point is that the difference between 205 and 200 and even 180 is huge to sportbike geeks (like me) - but such unrealistic difference in top speed is easily attributable to imprecise estimates.



Also note that at slow speeds, the officer has time to take a bite of doughnut and slurp some coffee and still have a reasonable estimate of speed because of the relatively long time it takes to travel the measurement distance at speeds closer to the legislated speed limit.



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Old 09-22-2004, 10:54 AM   #12
Nplateau
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Default Re: 205MPH on a CBR 1000RR?

So true. So true.
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Old 09-22-2004, 11:02 AM   #13
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Default Re: christian_gates

????????????? Uhhh.... yeah ... what he just said ... I think ?
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Old 09-22-2004, 11:05 AM   #14
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Default Re: 205MPH on a CBR 1000RR?

I saw Greg White on 2 Wheel Tuesday trying to

make a case about how the speed was exagerated.



It doesn't matter if it is 180 or 205 mph. This is so completely stupid. Right up there with the idiot that killed himself doing naked wheelies for some bunch of idiots that actually film and sell this crap.



Now I feel better....
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Old 09-22-2004, 11:10 AM   #15
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Default Re: Parallex error??? Physics for Racerboys.

Parallax error is error caused by the offset between a sight and path of the projectile being fired (or clocked). The idea is that the airplane could NOT be directly above both lines for the timing of the pass and it is likely (considering the improbability that the bike was actually travelling at anything near 205MPH) that the error in the reported speed is due to the officer triggering his timing device at the wrong moment, due to mistaking his reference points. -Sean

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Old 09-22-2004, 11:12 AM   #16
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Default Re: 205MPH on a CBR 1000RR?

The idea is to prove that the observation isn't anywhere near the actual speed that the vehicle was travelling and to say that because of this obvious error, no determination of actual speed can be made. -Sean
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Old 09-22-2004, 11:27 AM   #17
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Default Re: 205MPH on a CBR 1000RR?

If that bike wasn't seriously Hopped Up I hope he secured it away were it can't be tampered with, the "Law" has probably taken care of that for him. There is no way a stock 1000cc RR or RC51 (or anything) is going to go 205MPH unless there was a STRONG tailwind, or a long fall. Any number of experts could testify to that. If the guy was on Miguel's spare bike, well that would be a different story. There was most likely a timing error. This guy needs a Good lawyer (I know, oxymoron). If Justice is served (we all know that always happens in this country right?) the case should be thrown out, Next! Of course there is a lot of money to be made on victimless crimes in this Country.



An aside, I have always (since 14 anyway) wanted to go over 200MPH on a Motorcycle. If that guy was going close to that fast I'll bet he has had to LHAO over the bragging rights. Maximum Style points, an International Star? I'd buy him some drinks for the story but he may end up busy for awhile.
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Old 09-22-2004, 11:30 AM   #18
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Default Re: Parallex error??? Physics for Racerboys.

The parallax error is embedded in a much greater measuring error. I have reams of data from students in our intro physics labs here who perform a timing experiment similar to this that indicates that the reaction time error for such a measurement is on the same order of magnitude as the time interval being measured -- rendering the measurement statistically meaningless. If this story is true I'd love to be the expert witness testifying on behalf of the accused in court because the stated accuracy (read from a stopwatch) is about three sig figs off. It's total B.S. In my experience in forensics this type of terrible science is unfortunately, all too common.



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Old 09-22-2004, 11:32 AM   #19
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Default Re: 205MPH on a CBR 1000RR?

This guy will get slapped hard is my guess. I'm sure he'll try to prove he wasn't going as fast as indicated, but if there ever was a "kangaroo court", traffic court is it. There is no interest in fairness there, just give me the money man and do your service. I don't think the states will do much about these morons. By the time the guy gets done with lawyer bills, fines and community service, they will probably ask him to demonstrate his speed prowess again so they can have him do it all over again. The states would have to raise taxes without these guys.
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Old 09-22-2004, 11:37 AM   #20
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Default Re: 205MPH on a CBR 1000RR?

I figured you'd be in a good mood after the Bears stuck it to Green Bay last sunday. Heh heh.
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