Hello to All,
I have a question regarding the difference in range at maximum passenger payload between the stock Airbus A319 and the stock Airbus A320.
The ranges are 1800nm for the A319 versus 2600nm for the A320, both at full pax, namely 119 and 150 passengers respectively.
Both aircraft have identical wings in terms of wingspan and nearly identical fuel capacity.
The A319’s MTOW is indicated at 64’000 kg while the A320’s MTOW is given at 73’500. That is a difference in weight of 9.5 tons in favor of the A319.
Nevertheless, at nearly identical fuel loads, the range of the A319 (in the above-mentioned configuration) is 800nm shorter than that of the A320 (in comparable configuration).
Why is that?
I notice that both aircraft I measured use different models of the CFM 56 engines; namely the CFMI CFM56-5B5 (22’000 lbs flat-rated thrust) for the A319 and the CFMI CFM56-5B4-2 (27’000lbs flat-rated thrust) for the A320.
While it is true that the engines on the A319 are considerably less powerful than those on the A320, the cruise speeds of both aircraft are essentially the same.
Furthermore, given the lighter weight of the A319 compared to the A320 shouldn’t the engines of the former consume less fuel in cruise than those of the latter?
I imagine the answer lies in the technical specifications between the two types of engines. Additionally, perhaps the A320 reaches and maintains higher cruising altitudes more quickly (given its more powerful engines), ultimately using less fuel over the course of the trip.
Nevertheless, a difference of 800nm seems a lot of mileage difference to account for simply on the basis of an aircraft flying perhaps 3-4000 feet higher than its counterpart. Maybe I’m wrong. Maybe that does make all the difference after all.
For your information, I have found my technical references on airliners.net as well as from the FAA type certification data sheets available on internet. I have cross-checked the information with other information providers, including notably Airbus and airline operators of the types in question using comparable configurations.
I hope someone can explain this for me and thank everyone in advance who will be kind enough to help me.
Best Regards to all.