zeke wrote:Several times on this thread it has been stated that UA has published 789 furn burn data, I have asked for the reference time and again.
Why are people so afraid of making the source known and open to scrutiny ?
BTW I did not see significant fuel burn differences between numbers I have put on here for the A350 and flight plans, just like thepinkmachine did earlier. So there seems to be two schools of thought, those who fly imaginary planes on a flat earth, and those who do it in real life.
"QF9 FAST FACTS
229 passengers and crew
253.5 tonnes takeoff weight (half a tonne under MTOW)
100.6 tonnes of fuel
Approximate flight time of 17 hours 02 minutes
Departing Perth’s runway 21 at 1900 local time Saturday March 24
Landed London Heathrow at 0502 local time Sunday March 25"
from http://australianaviation.com.au/2018/0 ... in-london/
5883 kg/hr average
SQ22 101.4 tonnes, 17 hrs 22 minutes = 5838 kg/hr
https://twitter.com/FATIIIAviation/stat ... 1213747200
Do you realize you just gave evidence that, on average, the 789 should have a noticeable fuel burn advantage? You just compared apples to oranges, and the 789 still matched the A359.
QF9 is on the very edge of the 787's range (fuel burn disadvantage)
SQ22 wasn't at MTW, a fuel burn advantage
SQ22 is going eastbound and had very favorable winds that day (fuel burn advantage)
SQ22 is the ULR, which has a very thin passenger configuration (fuel burn advantage). QF9's config isn't dense either, but it's much more in line with common configs.
What we have is two data points. That's it. Two data points that are not a valid comparison for a conclusion, unless you want a biased result of course. We need a consolidation of dozens and hundreds of data points to make an accurate conclusion. To conclude that the A359 and 789 have near identical fuel burn rates goes against physics and economics. It means that Boeing did poor a job engineering the 789, and it also means that dozens of airlines are buying this mistake even with its significantly inferior economics. So do I trust you and your data points? Or do I trust science, Boeing, and the airlines? I think you know where I'm putting my trust in.