chambo,
Flex on a jet aircraft is the thrust required to meet the required performance for take off or a reduction of the max take off thrust that the engine can produce thus prolonging engine life
Hope this is the info you wanted
As with regards to using max reverse as opposed to brakes I think he was tying to say that it wasnt as tight to stop as expected more of a none event.
But I am interested to see the difference in the wet.
