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Landing G-force

iFlysimX

iFlysimX

Messages
11
Hello all!

Quick question — I'm looking for some help figuring out the best way to calculate landing G-force in MSFS 2024 (ideally from touchdown data like vertical accel / sink rate / SimConnect vars).

If anyone has experience with this kind of stuff (SimConnect, telemetry logging, add-on APIs, etc.), any help would be appreciated.

Thank you,
Clement
 
Use the following simulation variables: at the point VERTICAL SPEED goes to zero and SIM ON GROUND goes to true, capture G FORCE for your touchdown rate.
 
DragonflightDesign said:
Use the following simulation variables: at the point VERTICAL SPEED goes to zero and SIM ON GROUND goes to true, capture G FORCE for your touchdown rate.
Click to expand...
Thank you! And this for sure be the most accurate calculation? I should have mentioned that this is for Airliners, not GA aircrafts.
 
I assumed you were talking about airliners but it will work for all aircraft. Vertical speed will only go to zero once the oleo legs are fully compressed so yes, I'm pretty sure this is an accurate calculation. Make sure you trap SIM ON GROUND first, then VERTICAL SPEED.
 
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To convert g-force to feet per minute, you

- first convert g's to feet per second squared (ft/s²) by multiplying by ~32.2 ft/s²
- then convert ft/s² to feet per minute per second (ft/min/s) by multiplying by 60

resulting in approximately 1930 ft/min/s for 1g.

The full formula is:

G-Force (g) × 32.2 (ft/s²/g) × 60 (s/min) = Acceleration (ft/min/s)

Example (for 2g):

2 g × 32.2 × 60 = 3864 ft/min/s.
 
That's the most accurate way? Don't use the sim variables? Like PLANE TOUCHDOWN NORMAL VELOCITY or the VELOCITY BODY Y?
 
If they produce the information you want then yes, use them. The problem with baked-in simvars is that you have to wait for them and by the time they arrive they may not be valid any more, particularly if they don't have a high priority and they may have taken two or three sim cycles to be exposed. In a situation like that where I need an instant answer I prefer to calculate it myself so that I can use the result immediately.
 
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