What is the unit of fuel consumption of Boeing like 747 per unit of distance?

Question

most of the large air crafts take long time for load then get to ready for flight,that too partialy filled. what surpriseing is that how much fuel consumed per flight of distance of 1000km on rsurface distance ,is there any fuel for othere emergency

Answer 1

from what i can figure the 747 with the max. range of 5,300 nmi , and max. fuel payload of 48,445 u.s. gal. ,with taxiing takeoff etc. ,that would be about 9.1 nmi per gal.

Answer 2

When you consider the fact that there are about 360 people on board, and the freight carried, that will work out to about 40 nm per gal/per person. That is way more efficient than what you will see on the highways every day going to work, where the vast majority of cars are single occupant.

Consider it car pooling on a much grander scale.

Answer 3

For a fully loaded Boeing 747-300 in cruise flight burns approximately 4 to 5 US gallons (15-20 liters) per nautical mile. When loaded, it is often carrying more weight in fuel than in passengers and cargo. And yes, there is a reserve required by law in case of emergency, or simply if the destination airport becomes "socked in". The minimum is 45 minutes reserve.

As a matter of comparison, the fuel consumption of the Concorde was measured by the cockpit gauges in tons per hour!

Answer 4

The facts an figures vary vasty for different varients of the Boeing 747 series. A B747-400ERF, for example, holds 248000 pounds of cargo, 57000+ US Gallons of fuel, and has a max range of 7260 nautical miles.

Due to max takeoff weights, as with any other airplane, it cannot have a full load of cargo and full fuel.. You have to strike a balance. This is why you dont see flights that are 7000nm in duration. You would require a fuel stop somewhere along the way, or else, their could not be much weight in terms of cargo.

So the numbers you seek are variable.

As for the last question, YES, they figure in an IFR reserve amount of fuel. Some airlines have more stringent requirements than others. Typically, the required fuel must be enough to fly to the destination, ;hold for 30 minutes, then to an alternate + 45 minutes of reserve. The trick here though is that the plane must land with 45 minutes of reserve still on it. You are not allowed to use that reserve. So with the minimum amount of fuel on board, an aircraft could hold for weather delays in the air for 30 mins, then it would have to give up and head to the alternate airport and land. Many airlines anticipate longer holding times and add more fuel to compensate.