liftoff way before reaching VR

[berkkp]

When taking off, it occured to me that the aircraft is already producing substantial amounts of lift before reaching the EFB-calculated VR-speed, regardless of aircraft load level. Is this to be expected?

[Marcocessna84]

@berkkp

 

Normally not, however there are several factors to take into consideration: Weight distribution, Center of gravity, winds and trims. There is so much more but the main ones are the ones mentioned unless I am forgetting something. Try setting trims to -0.4 or more to see if this will allow you to reach your VR,V1 speed. 

Cheers

[berkkp]

15 minutes ago, Marcocessna84 said:

@berkkp

 

Normally not, however there are several factors to take into consideration: Weight distribution, Center of gravity, winds and trims. There is so much more but the main ones are the ones mentioned unless I am forgetting something. Try setting trims to -0.4 or more to see if this will allow you to reach your VR,V1 speed. 

Cheers

It's not that it rotates/has a nose up tendency. The wings produce so much lift, that even with the nose forced down, the main wheels will lift off.

[GGlima99]

I'm also facing this problem! It's very weird to reach V1 and the nose starts to go up already!

[nopixar]

Have to agree, there’s definitely something up with the lift. Even with a flap 15/0 takeoff at high weights rotating through about 5° the aircraft is already off the ground. I flew the A300 in xplane extensively and it didn’t behave anything like this. 

Edited January 1, 2024 by nopixar