To anyone who knows a little about aircraft design, do the 5X stats seem to make sense?
Falcon 5X
BOW: 38,100
MTOW: 69,600
Fuel: 28,200
Range: 5,200 @ M.80
lbs fuel per nm max range: ~5.4
Falcon 7X
BOW: 34,300
MTOW: 70,000
Fuel: 31,940
RangeL 5,950 @ M.80
lbs fuel per nm max range: ~5.4
I get that the 5X is 3,800 lbs heavier than the 7X and has a 8" larger diameter fuselage, but it also is using two clean sheet design brand new engines rather than three 25 year old engines. Two engines is fundamentally much more efficient than three plus there is the generational upgrade in technology. If you compare the G650 at its 7000nm @ M.85 performance, it only uses 16% more fuel per nm than the 5X despite the additional range, larger cabin, and 15,900 extra lbs of structure its carrying around (42% higher BOW).
What gives? With its stats it seems like the 5X should have more like 5,700 nm range. If Dassault product history is any indication (look at the Falcon 50EX/900EX/2000EX), they are due for a major refresh of the 7X that would add several hundred nm of range which would make the older trijet with longer range significantly more efficient than the newer twinjet with the same MTOW.