I read (from LNC or Jon Ostrower, not sure which one of the two) that Boeing is now looking at a 50000 pound thrust engine, which would suggest a heavier, and thus upper end aircraft.
I think this is risky. the 787 started as a 767 replacement but also "crept" up and is now too large for this role.
Will this now also happen to the 797 (compared to the 757, in stead of the 767)?
Not risky at all. Everything I've heard has it positioned halfway between the A321LR and 787-8.
I've been saying that it will be a tight 8 abreast aircraft for the last 12 months. The long range 5000nm version similar to the A310 in length and the short range 4000nm version similar to the A300 in length.
The A321LR at 97T and the 788 at 227T makes half way 162T.
That's 65% heavier than the A321 which has 33,000lb of thrust. 65% extra thrust comes to 54,000lb. So 50,000lb of thrust is spot on for an aircraft around the 150-160T maximum takeoff weight.
The stretched 797 version will nearly be as long as the 788 but with 8 abreast instead of 9 abreast. That is approx 85% the number of seats but at only 70% the weight it will be very efficient on shorter routes. The 787-8 will most likely be discontinued in the future so this 797 will still be much smaller than the 789.
The 797 simple shrink will have the same maximum takeoff weight so it will fly further. Like the A330-200/300 the shorter length will probably get a centre fuselage fuel tank for extra fuel. This model allows new long and thin routes to be opened up. In low density 3 class cabins I could see it flying 5500nm. This opens new routes in the following locations.
Japan to west coast US.
West coast US to western Europe.
East coast US to east coast Europe.
Most of Europe to Most of Asia.
The 787 was a great success because it could fly long haul routes while being smaller with lower trips costs compared to say a 747 or 777. Airlines loved the extra frequency or the ability to open new thin routes as it was easier to fill the smaller aircraft.
The 797 will do the same thing but on medium haul. It will be able to fly medium haul routes while being much smaller and lower trip costs than the A330's. So airlines will also love the extra frequency and the ability to open new thin medium haul routes. Busy airport pairs like Melbourne to Sydney could also upgauge narrowbody flights to the short ranged stretched 797.
Last edited by RJMAZ
on Wed Feb 14, 2018 2:18 pm, edited 1 time in total.