LMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6 Posted (8 years 4 months 6 days 3 hours ago) and read 3122 times:
Recently we had this 75 minute flight with a payload of just 3000kg where we burned 3100Kgs of fuel. On the way back, same flying time, our payload was 14,000Kgs and the burnoff was just 250Kgs more than the other sector. Can anyone explain this please? How much fuel does a B733 burn in the climb?
LMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6 Reply 3, posted (8 years 4 months 5 days 23 hours ago) and read 3083 times:
Actually on the return trip we were carrying just 300Kgs more than the outbound. I can understand that fuel burn is related to the total weight but the total weight is determined by the payload and on our return trip we were 11,000Kgs heavier.
3201 From , joined Dec 1969, posts, RR: Reply 5, posted (8 years 4 months 5 days ago) and read 2991 times:
Here are a few other factors that can play a role:
1. Winds, east vs. west bound
2. Actual distance flown -- especially in Europe, with both standard and tactical restrictions, the distance can vary quite a bit directionally on a city pair
3. Speed flown (late outbound but OK return? Restricted by ATC in one direction?)
4. Altitude flown (either intentionally for speed purposes, or due to ATC restrictions or weather)
5. Maneuvering on approach (or even departure) -- for traffic or other issues, can make a big difference, also early descent/leveloff into some airports can be severe and others nonexistent, runways can make a difference (e.g. if both airports have 09 active, eastbound flight can be much shorter than westbound, depending on the arrivals/departures for the specific airports)
Also did you count the taxi burns as well? Were the taxi times similar?
Big thing is knowing the actual distance, speed, and altitude for each direction.
LMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6 Reply 6, posted (8 years 4 months 4 days 11 hours ago) and read 2943 times:
I know that the taxi time were the same at both airports and that 200Kgs was allowed for that. The flight conditions were also the same. Altitude only differed by 1000ft. There were no significant winds, in fact the wind was x and light all the way in both directions and no weather avoidance was required. I will take other readings on different flights to check the variance and post here.