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Joined: Feb 27, 2006 Posts: 14892 Location: Keynsham
Posted: Tue Aug 10, 2010 11:36 pm Post subject:
On the other hand --- take an example of 60 yards straight line, 70 yards round the twisty turny. Would the bendy way be 10mph faster? (I worked that out by thinking of 60 miles and 70 miles with refresh rate every hour - at grammar school, my maths mistress accused me of cheating when I got a pass at GCE O Level!) _________________ Dennis
Joined: Feb 27, 2006 Posts: 14892 Location: Keynsham
Posted: Wed Aug 11, 2010 8:15 am Post subject:
mikealder wrote:
DennisN wrote:
I worked that out by thinking of 60 miles and 70 miles with refresh rate every hour
Then divide the difference by 3600 (clue is how many seconds in an hour) and you will find out the answer you are looking for and its not 42 - Mike
Oh dear - us little 'uns only ever got up to 10 times tables. The big boys did their 3600 times tables, but by the time I to got that age, they'd started the new education and didn't do tables any more.
Fortunately my iPhone has a calculator - it's 0.00277778mph _________________ Dennis
Joined: Apr 04, 2006 Posts: 10118 Location: Bexhill, South Sussex, UK
Posted: Wed Aug 11, 2010 8:52 am Post subject:
DennisN wrote:
take an example of 60 yards straight line, 70 yards round the twisty turny.
You would need to to travel the 70 yards in the one second update period of the satnav. That's a speed of about 143mph. I wonder how you are going to negotiate the twisty turny bits at that speed? Perhaps these figures as well as Mike's above give a little idea of how much (little) difference it will make on a twisty turny road. Will it make a difference if you are going up or down hill? Probably, but also infinitesimaly small. Mike will no doubt give us the maths for that as well at the weekend.
Joined: Feb 27, 2006 Posts: 14892 Location: Keynsham
Posted: Wed Aug 11, 2010 8:56 pm Post subject:
For the benefit of anyone who has NOT twigged it, my posts in this subject are intended to show that as a lay ignoramus, I view the "problem" of twisty turny, uppy, downy as a remote, impossible occurrence.
Whatever speed I'm doing, I have no idea how many yards I'll travel in a second (although I have calculated that at 60mph I'll travel 880 yards in 30 seconds), but I'm convinced that any degree of twisty, turny which I stated might be negotiated without danger of crashing ("assuming twisty turny negotiable at 50mph without bending hedges") is far too insignificant to remotely affect the speed differences between a satnav and a speed camera. _________________ Dennis
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- at grammar school, my maths mistress accused me of cheating when I got a pass at GCE O Level!)
Perhaps these figures as well as Mike's above give a little idea of how much (little) difference it will make on a twisty turny road. Will it make a difference if you are going up or down hill? Probably, but also infinitesimaly small. Mike will no doubt give us the maths for that as well at the weekend. 
