richardg8jvm

thanks for the replies

Hi What is the official milage that the cambelt needs to be changed Yeti adventure 4x4 TDi Its due for its MOT and I know the front disks are worn and the pads probably need changing. getting a bit of shudder when braking at hi speed. It still a very stable car , I've been using it on the German autobahns , you know that place where you can be driving along at a sedate 100mph and something goes past you as a blur. If anyone is interested average fuel consumption if revs kept below 2500 is 780kms /tank but if the engine revs are btween 2500 and 3000 it drops to 700kms/tank

Thanks Redboy I've looked at the list of exclusions on the quotes I've had and I'm not impressed, as pointed out there is an extended warranty on the fuel system component since the software fix. So far the main dealer I've used have been very good, with no attempt to inflated bills. The question is on longevity of engine, gearbox and haldex, I hope the clutch has a good life, most of my driving is motorways etc. If the clutch plate could be changed without dropping the engine & gearbox down, that would make a big difference , ie is there enough room to split the engine & gearbox in situ , I've done that on petrol engined Fiats when they said the engine & gearbox need to be lowered, but diesel engines are a lot heavier, and I'm a lot older now . The cost of warranties is the same as two holidays worth of diesel, I'm thinking holiday fuel may be a better bet

My Yeti Adventure is now 4 years old, and the only problems I've had since getting a soft rear spring replaced on purchase was a screaming fan belt. Its been driven around Ireland and just back from Croatia, including taking the old un made up mountain road over the top of Sveti Rock. Its done 45K miles, is it worth buying a warranty to cover another year. I've always driven Fiats before and no major mechanical problems until at least 7 years old. Never any major engine or gear box problems, just the normal EGR sensor failure and wiring problems Fiat are famous for. So how reliable are Skoda 4x4 diesel yetis , how long typically before major problems appear ? One thing I did notice while low flying on the German autobahns is since having the engine software updated there is now a sweet spot at 90mph where the fuel consumption drops to below that at 70mph, I was seeing 5lts/100kms. Also heavily loaded as well. Still pulls well over 100mph ( GPS indication) and very stable. And before someone chirps in about exceeding the speed limit, unless informed by fixed limit signs or overhead lane signs, there is no speed limit on the German autobahns, its advisory. TiA Richard

Now I have V9 West Europe map installed and V8 East Europe on an SD card You can not use both maps simultaneously If you drive outside of the area of the selected maps no roads are shown. So putting a route in from somewhere to the west of Germany to say somewhere in eastern Europe wont work Once you select "use SD Card" only the maps on the SD Card are read. It will however store addresses that are on the map covered by the SD Card So at least you can enter all the hotel, ect addresses before departure.

Just updated to V9 Europe West, to ages to load. I will be needing to use Europe east maps later in the year. Question when a SD card is selected via menu as "use Card" does it use the data on the SD card instead on the data held in memory or in addition to it ? ie with the Europe East card in the slot and selected, but not overwriting the Europe west map installed, are both sets of data available or only the Europe East maps on the SD card and the Europe West maps unavailable. Not doubt some will find an excuse to flame even on a simple question !

From the date, 10 years ago I would guess X band or 24 GHz radar; both systems use doppler shift measurement, but the laser only needs an area of 1 millionth of a millimetre (squared ) where the incident angle is 0 degrees, so its much faster to acquire returned pulses. Maybe faster, but its less useful in wet conditions as rain drops are substantially larger, so you get refraction as the light passes through the rain drop.

The Daily Mail made a Freedom of information Request in June 2005 if I remember what I've seen list on the gov.uk site bit no content of the info supplied

As to GPS accuracy, the sampling is only done at 1sec intervals, which leads to errors as you have to travel at a constant speed long enough to allow for settling, and the error to average out, and make sure you are receiving signals from at least 6 sats. More accuracy requires the use of surveying GPS receivers which sample at 20 times per second. The last camera usage guidance in the public domain is very old 1981, but that quotes errors of +10/ -8.5% for a 10 degree offset. If you put the 90 degree angle in drawings posted you get the same answers as I do if the right angle is put at the point of offset, not as shown But you cant just use one right angle triangle to demonstrate this as each as the speed can be measured within one revolution of the car wheel and is taken several times. If use use the calculations for bi-static radar and null each in turn, placing one where it should be ,at the side of the road, and the other offset from the road by 8 mtrs I would recommend trying the analysis unless you are familiar with using MatLab as its a process similar to fast Fourier analysis. There is further documentation on errors produce on the IEEE.org site. unfortunately I no longer have access to that since retiring. I asked as simple question, turning in to a trolling match, whos going to throw in quantum theory to really make things complicated ? One thing very important to note. Don't rely on any thing posted on web sites where the author remains anonymous, only rely on professional papers where the author/s are identified and their qualifications are listed, and they list references to other documents.

I beg to differ Jim That site is over simplified and is two dimensional. time has not been factored in . Velocity is the relationship between distance travelled and the time taken to do it. If you travel in a direct line towards the measuring device the recorded velocity is accurate within the tolerance of the measurement device If there is an offset to the measurement position , you will no longer be on a constant bearing to the measurement position and it will appear you have travel a greater distance. As the measurement time will be a constant you be recorded as travelling a greater distance in a given period of time. Therefore, as the recorded distance appears greater and the time is constant, you will have appeared to increase velocity.

No I'm not # but you said "If I fly to a DME sight via a curve flight path I will get there sooner than a straight one apparently and my GS will be higher also? Sounds like a way of getting to Mars much quicker. " Just pointing out that what appears to be a straight line on a Mercator projection is not . The great circle line which will appear as a curve on a mercator projection is true shortest route A to B Like This Mark Solved Quote MultiQuote

Muddyjim the link supplied is over simplified, and makes no allowance for distance travelled of the target vehicle. Older X band microwave systems needed a longer measurement interval as the target area needs to be greater than a quarter wave length,aprox 10mm, and the incident angle needs to be 0 degs. its also subject to Faraday rotation.. The use of infrared lasers with a wavelength of typically 1000 nm requires a very small area where the incident angle is 0 deg , as car bodies a curved there will always be an area where an incident angle of 0 degrees is present; hence one of the reasons why stealth aircraft use many flat surfaces so as not to provide an incident angle of 0 degs to radar so the measurement period is very short, and limited by processing speed a few 10's of milliseconds. With the older X band microwave systems the police were well aware of its short comings, with IR laser based systems, which the manufacturers claim to be far more accurate, they still have to be used correctly. Ryeman, don't get confused with the Mercator projection of maps, you live on a spherical object, albeit in your case an upside down one Thanks to those who read the original question and provided the answers to that question

No the error is not in favour of the driver, just the opposite. Calculate it yourself and you will see, do not forget it is not one triangle you calculate the hypotenuse from, but two , one at the start of measurement and one and the end of measurement, the difference in the patterns will leave a obtuse triangle, with the shortest side being the distance travelled. depending on the pulse repetition rate of the measuring device will result in the measured distance. Plenty of Radar theory papers available on line, many are mathematically intense. The maths becomes a lot easier to understand if you take the range of acquisition as units of time instead of distance, ie divide the distance of the hypotenuse in metres by the velocity of light in free space , 300,000,000 mtrs/sec Aerofurb you are correct about tyre wear, my calculations on a 17" rim, gave an error of 0.234%/mm wear Graham ..read what was posted, and no I have not had a recent speeding ticket !

Look up Pythagoras Law, and very basic trigonometry. The Police allow for the inaccuracies in car instrumentation and make allowances above that. BUT the camera partnerships have civilians operating equipment who are not properly trained in how to use the equipment. I haven't advocated driving in excess of the speed limit, just know what speed you are driving at. As for proving FACTS, there is no need to proove trigonometric laws which have existed for centuries and are accepted by all institutions. It doesn't matter what algorithms are used to calculate speed , if the equipment is not used in accordance with guidelines it will not give accurate results.

I see someone thinks cosine correction is an excuse and not a fact It certainly is a FACT. If Your speed is measured over a distance the measurement device must be in the same axis. moving the measurement device away from that axis moves it at right angles from that axis and Pythagoras's Law applies. Something accepted for the last 2000 years + A problem is now that many camera partnerships believe that using infra red lazers eliminate this and it only applied to microwave measurement devices. However, this is wrong as the velocity of light and radio waves is the same. The standard of scientific education in the UK is appalling now.