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##0. A common figure: 15%.

##1. If the fuel was weightless problem first.

##2. Problem two: carrying more fuel for the same trip distance.

##3. Percent of Landing Weight (LW) per hour.

0. A common figure: 15%.

1. If the fuel was weightless problem first.

2. Problem two: carrying more fuel for the same trip distance.

3. Percent of Landing Weight (LW) per hour.

(Own work) Click to view.

(Own work) Click to view full table.

For example, if our baseline flight needs 15% fuel fraction, it will still be 15% of the new higher weight (landing weight + trip fuel). In other words, if the LW goes up, the trip fuel goes up.

NM      FF/eng (kg)

 800    2510
1200    2460
1600    2440
2000    2450
2400    2450
2800    2450
3200    2470
3600    2480
4000    2490
4400    2510
4800    2540
5200    2560
5600    2580
6000    2610
6400    2640
6800    2660
7200    2690
7600    2720
8000    2750

(Own work) Click to view.

For example, if our baseline flight needs 15% fuel fraction, it will still be 15% of the new higher weight (landing weight + trip fuel). In other words, if the LW goes up, the trip fuel goes up.

NM      FF/eng (kg/hr)

 800    2510
1200    2460
1600    2440
2000    2450
2400    2450
2800    2450
3200    2470
3600    2480
4000    2490
4400    2510
4800    2540
5200    2560
5600    2580
6000    2610
6400    2640
6800    2660
7200    2690
7600    2720
8000    2750