Kaddyuk From Wallis and Futuna, joined Nov 2001, 4126 posts, RR: 27 Reply 1, posted (7 years 11 months 1 week 8 hours ago) and read 17789 times:
Airlines tend to use what they call "Standard Figures" I think its about 1 Tonne of fuel at LHR for a B747-400. Two tons might be used at larger airports such as JFK. I will guess that the airlines will monitor the fuel usage during taxi and adjust the standard figure based on their findings
Whoever said "laughter is the best medicine" never had Gonorrhea
TristarSteve From Sweden, joined Nov 2005, 3855 posts, RR: 34 Reply 4, posted (7 years 11 months 1 week 6 hours ago) and read 17707 times:
The flight planning system used by larger airlines adjusts the taxi fuel by airport and time of day. I see different figures all the time, but around 200kg for A320 and 400kg for B777, this with an average 10 min taxi.
Doug_Or From United States of America, joined Mar 2000, 3300 posts, RR: 3 Reply 15, posted (7 years 11 months 5 days 9 hours ago) and read 17266 times:
DHC-8 uses about 260 lbs/hr per side for taxi. If you feather you can bring it down to 160 or so. We usualy taxi on 2 engines @ outstations where we have a short wait, but at the hubs we'll go out on 1.
Wheeltug From Australia, joined Jan 2006, 11 posts, RR: 0 Reply 16, posted (7 years 10 months 1 week 6 days 4 hours ago) and read 16957 times:
An interesting discussion I run a company that is developing a ground propulsion system which uses electric motors placed inside the front wheels to drive around (backwards and forwards) on APU power alone. Anybody want to hazard any guesses as to what the fuel savings might be for particular aircraft. I for one, don't know, I just started the job I'm just trying to figure out which aircraft model would be the best target for our first product: Big, but few flights or small but lots of flights.
Rsbj From United States of America, joined Jan 2006, 152 posts, RR: 0 Reply 18, posted (7 years 10 months 1 week 4 days 10 hours ago) and read 16861 times:
The CFM56-7b on our 700's burn about 650 Lb/hr per engine with no bleed, and 690 with engine bleeds on. I think if you divide the certified thrust by 40 to 50, you'll be real close to ground idle fuel burn per hour on just about any modern high bypass fan.
Wheeltug From Australia, joined Jan 2006, 11 posts, RR: 0 Reply 20, posted (7 years 9 months 3 weeks 2 days 15 hours ago) and read 16425 times:
That is it, although just a demo model. As another poster in another thread pointed out, it wouldn't exactly retract nicely.
I've taken a long time to respond because I've been hard at work learning as much as I can learn and putting together a new web site. Being as I'm not an aerospace guy by birth (just a finance guy by training, actually) I'd love it if people wanted to take a look at the new website before it went public to correct my mistakes. It's at www.wheeltug.gi/beta.
YOW From , joined Dec 1969, posts, RR: Reply 21, posted (7 years 2 months 5 days 7 hours ago) and read 15967 times:
Quoting LongHauler (Reply 13): We use 200Kgs taxi fuel for the A319/320 and 300Kgs for the A321. For forecast long taxis or deicing, additives are applied.
LongHauler or anyone else on here, do you allocate 200 Kgs across the board for 319/320s or do you allocate more for large airports like YYZ & YVR (say 250 kgs) and less ground burn fuel at smaller airports like YOW & YHZ say (175 kgs)?
Lemurs From United States of America, joined Mar 2005, 1439 posts, RR: 4 Reply 22, posted (7 years 2 months 4 days 5 hours ago) and read 15853 times:
It's a fantastic idea...electric motors are great for generating gobs of torque from a very small package, and that's all you really need for groud ops on an airplane. It's hard to think of a worse way to move an airplane on the ground than a jet engine, really. Maybe several million mice on a very large treadmill...
There are 10 kinds of people in the world; those who understand binary, and those that don't.
TristarSteve From Sweden, joined Nov 2005, 3855 posts, RR: 34 Reply 23, posted (7 years 2 months 4 days 5 hours ago) and read 15850 times:
Quoting YOW (Reply 21): LongHauler or anyone else on here, do you allocate 200 Kgs across the board for 319/320s or do you allocate more for large airports like YYZ & YVR (say 250 kgs)
When we get the flight plan it has a suggested taxi fuel that varies from 140kg up to 250kg. The flight planning computor has averaged out the taxi times for different airports at different times of day and suggests a mean. The pilot can then adjust this to allow for local conditions. (A320).