and you lost a donk at V1, then no, Flex power will not be adequate.
I am aware of that. The open question is "by how much"
That is why I said above if you push power to max, toga or the EMC/FMS does it autonomously then you would surely have adequate climb power as the flex is taken out of the equation and a "normal" OEI climb at V2 should be possible.
I would like to hear from an A320 pilot, be great to see actual figures. If we wait for the ATSB we will all be retired.
Flex is just the Airbus way of saying Derate.
I believe flex/ assumed temperature and derate are two different things. Although it does get confusing once the US citizens get involved with the language.
De-rate is more about selecting a power setting such as TO1 TO2 TO3 which can itself be flexed, two different beasts as far as I consider power ratings.
However...
http://www.skybrary.aero/index.php/R...Thrust_Takeoff
https://flightsafety.org/asw-article/when-less-is-more/