747-8 engine


  1. I love it how they have say best GE has ever produced'….not in the world cause RR so far ahead of them and they trying sound good. lol

  2. Actually the BA 777 was due to a heat exchanger that Rolls Royce did not design properly. The QF A380 was due to an incorrectly manufactured oil feed stub pipe. Both Rolls Royce issues. Look it up. Rolls generally makes good engines but the way they handled the Qantas incident turned me off of their engines.

  3. A380 was due to a broken oilpipe. B777 was Ice Crystals in fuel = not R&R's fault.

    The A380 that failed was a 1:1000000 scenario.

  4. acho que devería ser em Português,
    O que analísar em outra lingua estranha? difíceln não é? Assim sendo, não gostei déssa grande merda……………………..cacamir……………………

  5. Franciso…. como me gusta ver que si que hay alguien que, aunque mezclando idiomas, lo explica fantástico jajajajajaja.

    Felicitaciones… A Paco no al video, yo personamente… me quedo con mi Cessna 172 xD

  6. Thanks mate… Now when I see a jet engine in the wet, I'll understand why it still keeps going. You should be a lecturer with your understanding of physics…

  7. if you try with this search in internet you can find a interesting simulation "Journey through a jet engine"

  8. gas is a compressible fluid, water is not a compresible one, gas under gas law increses pressure by change of energy from velocity to pressure with temp increasing, liquid in the same condition changes of state from liquid to gas, in the first two or three stages wáter is vaporized, then

  9. So sorry stage, not etages, but gas turbine have another metric like temperatura ratio Temp exit nozzle/Temp inlet = Temp released by axial/Temp inlet * Temp combustión chamber exhaust / Temp released by axial * Temp power turbine exhaust / Temp combustión chamber * Temp exit nozzle / Temp power turbine exhaust, then temp combustión chamber is bigger tan temp released by axial, currently the exhaust of a combustión chamber reach 1000 deg to 1400 deg, the one in the axial is among 800 to 900 deg

  10. This is not linear, first one gas generators have compression ratios among 1:7 to 1:13, early 70 reach among 1:15 to :1:19 today have 1:21, this related with gases law of a staecheometric mixture of gases. All gas are compresive fluids wáter is a non comprensible fluid. The compresror changes velocity into pressure compression the gas and increassing their temperatura, wáter reach by increasing of temperatura and pressure an change of state, and dissapears in the first two o three etages.

  11. not true. old engines have 11:1 compression and the temp rises to 800 degrees. at a compression ratio double that why would 1000 degrees seem unlikely?

  12. So, when air is pressurised by the compressor blades, heat is generated and that vaporises the water – Is that right?? Hard to believe that pressurising air increases it's temperature, and THANK YOU for your reply…

  13. the most of the air passes through the fan is used for cooling only 20% or 30% is used in combustión purposes

  14. Cheers mate… Whilst we will not lose any sleep over the intricacies of the modern Jet engine, your answer gave me more information than I knew, so on that basis, Thanks for the reply….

  15. I'm not an engineer, but from what I do know, 70-80% of all the air passes through the fan and the air that passes through the compressor will be around 1,000 degrees before it reaches combustion.

    In a nutshell, I'm not that concerned.

  16. Can I just change the tone a tad and ask a simple, (but as I'm no engineer), genuine question which has me curious… Water/rain entering the engine, how does it not enter the combustion chamber??? Is it literally "flung" to the sides and exits via the edge of the exhaust?? Don't laugh, We can't all be experts, but someone on her might have the answer??

  17. Given how close so many of the major 747-400 operators are to Rolls-Royce, it was still nuts to go exclusively with GE engines. British Airways (the largest 747-400 operator) can't afford a repeat of the uproar in the UK when it went with GE engines for the earlier B777s. Every order they make without RR engines is a political issue. All but ensures the supremacy of the A380.

  18. You should ask Qantas about Rolls Royce engines reliability …LOL. And regarding 777 ,in the last 12 months Trent 800 has had 3 IFSD whereas GE90 has had 2…..even though GE90 has 4.6 million FH compared to only 1.8 million FH for the Trent. GE90 flew 2.5 times as much over the last year and had fewer total shutdowns and the -115 had none .Source: Boeing First Quarter 2011 ETOPS report

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