I know the basics of the air files (maybe a bit more), but I've run into a problem (if it is a problem). I've modified a plane to do a maximum speed of Mach 2.45...here's the scenario. When it starts to reach Mach 1.10 (or so) it really takes a lot of thrust (etc) to reach its mark. Around Mach 2.0 (or so) the plane takes off, and it can reach Mach 2.40 (even 2.90) without any problems. Is this normal, or is there something that needs to be tweaked in the Air file. I've done all that I could in the Configuration file, but I would assume it's one (or more) of the tables in the .air file. I've worked on numerous planes since FS98, but never really flew/worked on a plane that was going faster than Mach 1.0. Any ideas of what to tweak, or some insight as to what the problem may be would be very appreciated. Thanks J.R.

Messing around with the .air file, I discovered it's table 1506 that's causing the problem (if you want to call it that). After a few adjustments (trial & error) it seems to be working the way I want it to. If anybody still wants to give some insight on table 1506 I would greatly appreciate it. J.R.

Turbine Corrected Thrust Factor vs CN1 and Mach. It's not usually set up to deal with anything past .9mach so that would be part of it.You might also need to pay attention to table 430 which controls the compressibility drag.

I know the basics of the air files (maybe a bit more), but I've run into a problem (if it is a problem). I've modified a plane to do a maximum speed of Mach 2.45...here's the scenario. When it starts to reach Mach 1.10 (or so) it really takes a lot of thrust (etc) to reach its mark. Around Mach 2.0 (or so) the plane takes off, and it can reach Mach 2.40 (even 2.90) without any problems. Is this normal, or is there something that needs to be tweaked in the Air file. I've done all that I could in the Configuration file, but I would assume it's one (or more) of the tables in the .air file. I've worked on numerous planes since FS98, but never really flew/worked on a plane that was going faster than Mach 1.0. Any ideas of what to tweak, or some insight as to what the problem may be would be very appreciated. ThanksJ.R.

Typically the drag peaks in the transonic region and then falls off beyond it. For aircraft like the F-4 Phantom the technique to achieve the shortest time to climb to high altitude and high Mach number involved diving to get through the transonic region quickly before resuming the climb. Although it's not relevant at the speeds you are talking about, the range of the Mach Integer table is fixed at 0 to 3.2 Mach with 17 entries.

Thanks for replies. Configuring table 1506 was what I needed to make the plane not struggle getting to Mach 2.0, and not take off like a bat of hell (pardon the expression) after that. Table 430 was great to adjust for the actual top speed, and how much thrust (N1) was being used at the faster Mach number. I got the plane to actually fly at Mach 2.70 with no problems with engine instrumentation readings. I'll be doing more testing, and tuning (table 430) within the next two days to figure out what I want the top speed to be. Thanks again for the help J.R.