Latecoere
The OP asked for the formula for TAS. Neither of us know whether he wanted the proper formula I gave or the - admittedly useful - approximation you gave. I simply answered the question, if you want to be the arbiter of the best formula fill your boots. Nobody else cares. Both are up there, the OP can take which one he needs. The end.
Last edited by oggers; 6th June 2016 at 17:05.