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Sagitar

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Everything posted by Sagitar

  1. Sorry, but I think you have to look for a different reason for an error of that magnitude. To get the indicated speed down to 35mph you would have to be on a slope that was greater than one in one. I.e. the hill would have to be so steep that the horizontal component was only 35 yards for every 50 yards actually travelled. If you can remember your pythagoras, that implies a vertical component of nearly 36 yards and an included angle for the road of about 45 degrees. A ten percent gradient changes the horizontal component by about a half of one percent, so your 50mph should show as 49.75mph on such a gradient. i.e. within the reading tolerance on normal instruments. A one in three gradient (e.g. Hardnott Pass . . . ) reduces the horizontal component by about 5% so the GPS would read 47.50mph. Not that I can imagine anyone doing 50mph down Hardnott.
  2. When I am laid in earth (from "Dido and Aeneas") by Henry Purcell
  3. How about trying this one? - http://www.treehugger.com/files/2008/02/exhaustburger_c.php
  4. I am sorry to be blunt, but that really is cobblers. Tyres on wheels in motion flex, the flexure generates internal friction, the temperature of the tyre rises and some of the heat generated is transferred to the inflating fluid, whatever it is. Similarly, rolling friction between tyre and road generates heat and some of this is transferred to the inflating fluid. After running for some time some level of temperature equilibrium will be reached, where the heat generated is balanced by the heat radiated to atmosphere. This temperature is always higher than the temperature at rest. It is simply not possible to run an inflated tyre from cold without a rise in its temperature. This is one of the reasons why racing tyres are pre-heated - it minimises the change in working temperature when the tyre is run. Every gas, including nitrogen, obeys the standard gas laws. The general gas law says that pressure times volume divided by absolute temperature is a constant. So if the temperature of the inflating fluid rises, so will its pressure. There may be some small expansion of the contained volume of a tyre because of the increase in pressure, but it will not be enough to counteract the whole of the pressure rise. Nitrogen may perform better than wet air because the evaporation of the water content of wet air will give rise to greater pressure changes for a given rise in temperature. If however, clean/dry air is used, it is a perfect gas and obeys exactly the same gas laws as nitrogen. In normal road-going vehicles the difference is so marginal as to be not worthwhile. In racing, the difference is worthwhile and it is probably easier to provide a supply of nitrogen than a supply of clean dry air. The essential reason why nitrogen is used in certain applications such as aircraft tyres and hydraulic/pneumatic systems is safety. Since it contains no oxygen, nitrogen will not support combustion. I am sure we have been through all this before . . . . .
  5. How can you miss out the Model T and the Austin 7 Look at this quote from Wikipedia "The Austin 7 was a vintage car produced from 1922 through to 1939 in the United Kingdom. It was one of the most popular cars ever produced there and wiped out most other British small cars and cyclecars of the early 1920s[1], its effect on the British market was similar to that of the Model T Ford in the USA. It was also licensed and copied by companies all over the world [2]. The first BMW models (BMW Dixi) were licensed Austin 7s, as were the original American Austins. In France they were made and sold as Rosengarts while in Japan Nissan also used the 7 design as the basis for their original cars, though not under license [2]. After World War II, many Austin 7s were rebuilt as "specials"[3][4][5] including the first Lotus, the Lotus Mk1 which was based on an Austin 7."
  6. If you have a physical negative (as opposed to an image file that is negative) and you put it through a photo scanner, then the scanner will produce a positive image file in jpg, tif or similar format, ready for printing. Is the negative part of a strip? Or is it a larger single negative? I am assuming that you are talking about a colour negative (i.e. a sort of orangy colour) You need to find someone with a photo scanner. Alternatively, if you don't mind paying, Jessops should be able to scan it for you.
  7. "behold, the mountain was full of horses and chariots of fire" (2 Kings 6:17) That would be the LF-A on the Nurburgring then? . . . . . . . .
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