PTFS Performance Calculator PTFS Performance CalculatorResults:
Thrust setting: ??? %
| V1 | ??? | kts |
| VR | ??? | kts |
| V2 | ??? | kts |
| Actual takeoff distance: | ??? | ft | |
| Takeoff run required (+15%): | ??? | ft | |
| Takeoff distance margin: | ??? | ft | (??? ft available) |
| Accelerate-stop distance: | ??? | ft | |
| Accelerate-stop distance margin: | ??? | ft | (??? ft available) |
Results:
| VREF | ??? | kts |
| VAPP | ??? | kts |
Thrust setting for VAPP: ??? %
| Actual landing distance: | ??? | ft | |
| Landing distance required (+15%): | ??? | ft | |
| Landing distance margin: | ??? | ft | (??? ft available) |
What is this?
This is a way to improve your immersion in PTFS by calculating your aircraft's performance capabilities before takeoff and landing. If you have a long runway, you probably don't need to utilize the full power of your aircraft. Save fuel by reducing your takeoff thrust. You may even be able to depart from a holding point that is closer to your gate. Instead of eyeballing it and risking an overrun, this calculator ensures you have enough distance to lift off - or stop, if you reject the takeoff. When landing, reverse thrust is usually unnecessary: this calculator lets you know when, and even tells you the margin.
What do the takeoff numbers mean?
The calculator gives you the thrust setting that is required to depart safely. V1 is the highest speed at which you can reduce the throttle to 0% and reject the takeoff. The distance used for this is the accelerate-stop distance. If you reject the takeoff after V1, you may overrun the runway. VR is the speed at which you should rotate the aircraft, leaving the ground. Finally, V2 is the speed which must be obtained by the end of the runway (at a height of 35 ft) in order to climb during an engine failure. In this calculator, it is assumed to be VR + 4 kts.
What do the landing numbers mean?
For landing, the calculation gives you the actual landing distance that you need to stop the aircraft (including a 7-second flare). It also gives the landing distance required , which includes a safety margin of 15%. The landing distance available depends on the runway you selected. VREF is the reference speed, which is the speed you should aim for on touchdown. The calculator assumes that you pass the runway treshold at this speed. Your aircraft should never be below this speed during final approach. In this calculator, VREF is 30% higher than your stall speed. VAPP is the approach speed, which should be flown on final approach. In reality, this depends on the headwind and other factors, but in this calculator it is simply VREF + 5.
Does it work?
Yes! PTFS and Roblox physics are somewhat janky, so don't expect miracles. In addition, we all fly a little differently in PTFS. But every calculation makes realistic assumptions based on experimentally recorded performance data for the aircraft you are flying.
Is the source code available?
The source code can be found on GitHub via this link and is released under an MIT license.
Help! I found a bug!
You can submit an issue on the GitHub page or contact me @cityuser on Discord.