I’m quite a bit experienced with 350 flying hours right now but I still have one thing that interests me when flying planes like the TBM 930. How can I calculate or know the best (=fastest, with 100% power) cruise level for different planes? Right now I’m on 15.000 ft with 230 kts ias. Some website tells me it cruises around 290 kts (or are we talking gs here?)
As a very rough rule of thump. The higher the higher the TAS.
(Ground speed = TAS plus / minus Wind).
This moves you trough the air / over the ground the fastest. That does not mean however it is the shortest time to fly from A to B as you also have to consider the time to climb to altitude. But that is more involved.