Im using the latest 0.7.3 stable build of the FBW A320Neo and notice that every single flight i do the MCDU always gives me the same v speeds
V1 122
VR 123
V2 127
In the tutorials ive read for this plane the V speeds always seem to be in the 140 range so i am wondering why mine are always so low and the same regardless of cargo/passengers/fuel etc
GW, temp, pressure altitude are main variables that affect V speeds. Certain configs do too such as flap settings given higher parasitic drag etc. as well as thrust settings/cost index etc. So, yes, there should be some variance particularly operating at high GW, high temps, and high airport elevation. I’m not sure how well PA and DA are modelled in sim.
I use FSTools - Performance Calculator to calculate my V speeds.
If you set weight and balance correctly (have it calculated automatically in the MCDU), the V-speeds should be adjusted to reflect fuel and payload.
Adjust the pax+cargo loads in the sim menu before flight. Inside the plane, adjust the fuel weight you need directly in the flypad (click the PLAY button) and after that the MCDU will recognize the correct fuel and payload inserted as well as the correct V speeds. That’s the way I could make it work here… But in dev version there’s nothing I can do to change the default ZFW even with high payloads.
The process for loading the airplane with payload and fuel can be found here: Fuel and Weight - FlyByWire Simulations Documentation
Otherwise, the airplane loads with the same payload and about the same fuel load each time. That is why your takeoff speeds are the same each time.