Et airbus sait précisément jusqu'où il ne faut pas aller en longueur
On notera que les sharklets donnent aussi de la marge en performance et qu'au final le surplus de poussée nécessaire pour garder des perfos indentiques aux CEO à 242t n'est pas énorme.
https://leehamnews.com/2018/03/20/airbus-launches-the-longest-range-widebody-in-the-below-300-seat-market/#commentsBjorn Fehrm
March 21, 2018
If you follow my Corners you’ll learn the induced drag is the key metric for take-off performance, both for normal ISA conditions and for hot and high. While the A330neo has the same thrust rating of 72klbf for the Trent 700 and the 7000 on the 242t A330ceo and neo, the neo wing is 4m wider.
I made a quick check in the model. To keep the same take-off performance as the A330ceo 242t with a Trent 700 at 72klbf, the 7000 shall be rated at 75klbf for the 251t A330neo. This within the TEN versions capability as it’s rated at 78.9klbf on the 787-10 (TO Thrust ratings for engines is a software change as long it’s within the top versions envelope).