Where are our hero's?
- Thread starter pred
- Start date
pred, thought you would know better, well that was a figure of speech!
If you know the principle of anything, you can fix it, no sweat! all things that are put together with nuts and bolts can be undone and refitted again! and knowing how it is suppose to work is just equally as important and why certain things are put the way they are. In principle a jet engine is just a compressor that compresses air to quite a high pressure and fuel is injected into the combustion chamber where it is ignited produces the forward thrust, as well as drive its own compressor shaft but yes with about a thousand components, and importance of lubrication and integrity of blades is the crucial factor in any jet engines, its not easy to fix ordinarily. specialised equipment and strict step by step procedures are needed to service one along with flight hours some parts are replaced irrespective of their wear and tear.
Today I sorted another problem for that mechanic, a Ford Fiesta 1.6 Zetec wouldn't start, AA towed the owner's car home, and the mechanic friend was asked to have a look as the AA man diagnosed it as a faulty crank sensor, so the mechanic removed the old sensor, and replaced it with a new one, however, it lasted about 10 minutes and the car was back to square one, so he asked me for my expertise, and brought me the old sensor, its tip had been worn out indicating that the flywheel was rubbing against it, though the inductive coil was intact and showed a continuity and a resistance of 400ohms, so I quickly placed my oscilloscope probes across its two terminals, and waved a ferrous metal across its head, and could see that it was responding, so next I brought it close to a drill chuck that has castle divisions for chuck key, and I could see the sensor was responding to every graduation, but then I noticed that if I brought it very close to the chuck like almost touching, the waveform started to produce lots of harmonics, which meant the ECU was not able to differentiate the
crank pulses accurately, as harmonics mislead the ECU into thinking that the TDC has reached whereas it may not have reached yet, so I suggested that if he places a small washer to space it up, it may actually work, and he did that and the car fired up.
however what do you mean by RTCU? real time clock unit? lol! but let me tell you whatever it is if it ain't working then bring it over and I will fix it or you shoot me! or if I can't fix it then I will shot myself!
The Lightning like I used to work on could be sitting on a runway in Cyprus in 40'c and within a few minutes be way over 20,000 ft and still climbing doing speeds in excess of mach1, I don't know what temperature it is at those altitudes but its pretty cold, so not only has the temperature dropped 40'c but also the pressure has gone from 1 bar down to about a quarter of that, therefore on a gas turbine they fit a Range Temperature Control Unit as apposed to a carburettor..
Takes a bit more than a lump hammer to fix it.....
Takes a bit more than a lump hammer to fix it.....
Sure! it is fascinating how temperature falls when we fly high up, I was once flying to America and the plane had a information screen that we were doing 540knots and the altitude like 30,000 feet and the temperature was like minus 60 degrees, (figures quoted are not exact) but they made me think!
But still I don't understand why it gets cold up there and I think I am going to have to google why altitude makes temperature fall, I know why the air pressure gets low up there, but never have come across anyone explaining why it gets cold the higher we go!
(Oh let me guess off hand, it may be to do with the atmospheric air pressure, the higher the air pressure the hotter it gets, like when you are pumping a tyre, the pump gets hot, but I thought it was to do with friction and compression of air) however, this may not be so, since tyres do not stay hot indefinitely, do they, and they will assume surrounding air temperature after a short while.)
So why does it get cold when you go up? I can't think logically why? stored ground heat radiation ?? may be!
Off topic I know, if its so damn cold up there how does global warming work?
As I understand it, our atmosphere is like an insulating blanket. Clouds help to keep heat in too, which is why if there is a clear sky at night it is invariably cooler than if there is heavy cloud cover. The higher you go, the less atmosphere - and hence the less insulation - there is. Further out into space the temperature can drop to almost absolute zero.
As for 'global warming', they claim that if there is more CO2 in the atmosphere it will be even more insulating, keeping in more heat. Bring it on, I say, especially at this time of year.
As for 'global warming', they claim that if there is more CO2 in the atmosphere it will be even more insulating, keeping in more heat. Bring it on, I say, especially at this time of year.
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