Border_Collie
Pocket GPS Verifier
Joined: Feb 01, 2006
Posts: 2543
Location: Rainham, Kent. England.
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 Posted: Wed Jan 10, 2007 3:15 pm Post subject: |
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| Quote: | | Yes, I agree with that. To take it to an extreme, if you drop your GPS off a cliff it won't register any speed at all for the vertical drop (if it still works when it hits the bottom). |
True. :D
| Quote: | | Interesting theory, but the problem is that the 3 4 5 triangle dimensions you quote the vehicle would have to climb or descend a 1 in 1.3 or 75% gradient which is practically impossible for a road vehicle. |
No quite so bad with modern vehicles but I remember way back when I had an Austin A30 and attempted Porlock Hill. I still have the smell of a burning clutch in my nostrils. :P
| Quote: | | A typical gradient for a steep hill is 1 in 4 or 25% which would cause a 3% error in the reading. However, you probably wouldn't want to do more than 30 MPH down a slope like this for fear or losing control of your vehicle. |
Which brings me again to Porlock Hill, Austin A30, drum brakes, hand brake on hard and using the gears. Change of underwear comes to mind. 
| Quote: | | In New Zealand there is a street which is a 1 in 2.66 or 38% gradient which claims to be the world's steepest paved street. It's bloody hard work to walk up too. |
Blimey!!! 8O
I checked my speedo against TT today and was surprised to find my speedo virtually spot on. :D I'll have to check it driving off Beachy Head to see if what you say about vertical drops true or not Skippy.
For those who haven't yet experienced it, if you holiday in the Lake District look for the Hardknott and Wrynose Passes, the latter being 1 in 3 a lot of the time. The scenery is spectacular.
| Quote: | A Brief History
Wrynose and Hardknott Passes in the Lake District. Contains some of Britain's most challenging driving, as well as some stunning scenery. A short walk from the car, you can see Roman remains, and a mountainscape opens up before your eyes, giving views of England's highest peaks. In the summer, the road is very busy, in winter it is perilous, but if you choose your moment carefully, and get good weather, the road is worth going out of your way to experience.
The Romans were the first to build a road through here, around 2,000 years ago, linking Ravenglass and Waterhead (on the northern tip of Windermere, now part of Ambleside). Traces of the Roman Road remain - it is now a footpath running just to the north of the road through the Duddon Valley between the Hardknott and Wrynose Passes.
After a career as a Packhorse Road and a tank training ground, Bike Magazine reports that it only received its tarmac surface after the Second World War. One look at the terrain will leave you wondering how they will ever re-surface it! |
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Formerly known as Lost_Property
And NO that's NOT me in the Avatar. |
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