Tagged With "accuracy"

Topic

Speed trap accuracy

Deven Hickingbotham ·
I was surprised to see the results showed me going 165.0 mph in the speed trap. I'd never intentionally get that close to my tech speed. My GPS's recorded 162.677, 162.716, and 162.9 mph. Has anyone else noticed such a large discrepancy? And if someone is DQ'ed for going too fast and has GPS data to indicate otherwise, would a protest succeed?
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Re: Speed trap accuracy

Ted Spendlove ·
In answer to your questions: Yes No
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Re: Speed trap accuracy

Bob Allyn ·
Deven, Dave and I run two GPS's. The primary showed 242 and the navigators GPS showed 243MPH at the trap. the trap speed listed in the results indicate 243.3MPH. With all the discussion about the trap speed accuracy over the years, our GPS speeds have always been within one mile per of the trap results.
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Re: Speed trap accuracy

Deven Hickingbotham ·
Yes, in the past my GPS speeds have been very close to the trap speed, but not this year.
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Re: Speed trap accuracy

Tom King ·
Deven, my readings agree with your observations. I went through the trap at 155 as indicated on my GPS, but the posted speed is 158.8 mph.
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Re: Speed trap accuracy

Dave Bauer ·
I think part of the problem is the lack of noise from your car so they don't know that you are coming. So they have to hurry to catch you in the trap.
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Re: Speed trap accuracy

Tom King ·
Yeah right, Dave, they have to hurry to catch MY car Holy cow, 243 mph??? You guys are amazing.
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Re: Speed trap accuracy

Deven Hickingbotham ·
I think they wrote down how fast it looked like I was going Surprised it wasn't higher
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Re: Speed trap accuracy

George Suennen ·
I've had both high and low readings through the trap. GPS 201 mph, trap speed 196.4 mph as a low and a 208.4 and GPS 204 mph as a high (though I did have a 208 high reading on the GPS, just not where I thought they would target me). GPS units read an average speed through the distance they traveled, the radar will read an instant speed when they target you. , so there will be differences. I commend those guys willing to stand out there in the sun and try and get our speed readings. George...
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Re: Speed trap accuracy

Charlie Friend ·
Hi Guys, I can completely answer all of the questions about the speed trap errors. It takes a long entry to do this. I have tried this before and before I can get all of the entry made, something happens and I lose everything. I'm not all that computer literate, but is there some way that I can type out all of my entry in my computer and then when it is finished, send it to the msg doard???? Charlie
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Re: Speed trap accuracy

Mike Borders ·
Charlie, just make your remarks in Word (or Wordpad if you don't have Word), and when you're happy with them, just highlight, cut, and paste the whole thing into the thread.
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Re: Speed trap accuracy

George Suennen ·
Charlie, You could type the entire message in wordpad or notepad on the pc, then copy the text (highlight then hit ctrl-C) and paste (ctrl-V) into the reply box on the forum. I that doesn't work you can email it to me, and I can add it to the forum. George 1990 Porsche 928 S4 http://928.jorj7.com
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Re: Speed trap accuracy

Charlie Friend ·
Thanks guys!!! I'll get on it tomorrow. Charlie
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Re: Speed trap accuracy

George Suennen ·
Charlie Friend's answer: Here is my take on the speed trap results during the last few years. In 2012 I was disqualified at the NORC for being under my minimum speed at the finish line. I was running my “Corvair” in the 180 class and my minimum speed was 150 mph. I was on a team so I wanted to get an accurate time even though I was the only car in class. As I approached the finish, I was aware that I was slightly early so I was slowing pretty aggressively. I was shocked at the banquet when I...
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Re: Speed trap accuracy

George Suennen ·
So I added Charlie's answer, as well as attached the Word doc that he sent me (just to see if that will work). Also as a side note, before the 2016 SSCC event John Bigley posted this note: http://silverstateclassicchall...-are-now-operational which does address some of the fixes they have implemented recently. George 1990 Porsche 928 S4 http://928.jorj7.com
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Re: Speed trap accuracy

Mike Borders ·
Somewhere, in all of the debris of our racing storage garage, is a remote radar gun stand we made as well as a speed display board of the old "yellow number flip" style. With this, we set the radar gun up near the road to reduce the cosine error to the bare minimum. We used it in our early days of running our ORRs in Battle Mountain & Wendover. Many years ago, in the Waldman era, I offered it to SSCC and was turned down with the reason being the speed display board was a distraction to...
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Re: Speed trap accuracy

Charlie Friend ·
I had forgotten about the post from John about a RADAR gun that would compensate for cosine error. I did ask at the time (on the msg board) for the name of the new unit that was to be used so I could find out how it operates. I don't remember getting a response. Thinking about it .....maybe there could be a dial of some sort on the new RADAR gun that could be used to set a given angle off that would compensate for cosine error. If true, this would work just great....but it would only work...
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Re: Speed trap accuracy

Asa Jay Laughton ·
I'd like to point out that my first venture at SSCC was in 2012 and I attended the same Rookie School that Charlie found himself at. Despite the disagreement of whether he should be there or note based on the facts he put together, Charlie was ever the gentleman at the Rookie School, even through Blue's ribbing. He also drove an SUV as I recall, in the Rookie School and from what I heard later, had impressed quite a few people doing so. And thank you Charlie for the great explanation of why...
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Re: Speed trap accuracy

Tom King ·
Yep, AJ, that was Charlie driving his Tahoe around the tight little outer track at LVMS in Qualifying School after his questionable DQ. He was so smooth and fast, he was consistently catching some sporty cars - very impressive! Now the only explanation I need from Charlie is why do I have a Silver State T-shirt with a picture of his Corvair on it?
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