Serious asymmetric loadout error.

[Tenkom]

I just noticed something very wrong with the flight model while flying. If you have a an asymmetric loadout the plane will keep rolling towards the heavy wing even when inverted... While flying right side up it's natural that the heavy wing will drop. However when the plane is inverted the heavy wing should roll the plane the opposite direction right? I'm no aerodynamics expert(quite the opposite) but at least that's how it should be in my mind.

No track attached but you can just start up a mission, jettison everything on one wing and you will see what I mean. Running the current Open Beta version.

[Bailey]

I just went in the sim and confirmed the above. My brain hurts now.

[Bailey]

Hello. I am back. False alarm? I trimmed and the plane did as expected. heavy side to earth.

[Tenkom]

I tried trimming. It is certainly possible to stop the rotation with trimming. But it doesn’t seem to stop the problem. Heavy wing still just seems to roll the plane the same direction regardless if the plane is inverted or not.

[Bailey]

Just trim nose up/down. Don't trim wing. That ruins the test.

[Honey]

Sorry, maybe I misunderstood, but the heavier one side is, the stronger it is pulled towards the center of gravity, hence the roll towards the heavier side. Why should it be different?

[Svend_Dellepude]

I see the same thing. continuous roll to the heavy side. Gravity is out of order.

 

[Honey]

Is this not what you're seeing when you fly the harrier or do you think it's not how it's supposed to be?

 

 

[Svend_Dellepude]

Let go of the stick and see what happens.

[Honey]

11 hours ago, Svend_Dellepude said:

Let go of the stick and see what happens.

 

Yeah, in the previous test I was obviously faking it to roll in the right direction with stick input. Here's another video of another test with axes widget on.

 

 

Axes widget has been obviously added in after effects. Moon is flat. Earth landing was faked. Lol.

Edited December 7, 2020 by Honey

[HWasp]

On 11/28/2020 at 12:57 AM, Tenkom said:

I just noticed something very wrong with the flight model while flying. If you have a an asymmetric loadout the plane will keep rolling towards the heavy wing even when inverted... While flying right side up it's natural that the heavy wing will drop. However when the plane is inverted the heavy wing should roll the plane the opposite direction right? I'm no aerodynamics expert(quite the opposite) but at least that's how it should be in my mind.

No track attached but you can just start up a mission, jettison everything on one wing and you will see what I mean. Running the current Open Beta version.

 

Roll moment depends on your elevator input regardless if you are upside down or not, as long as the G is above 0, lift is created on the wings and the center of gravity is offset due to the assymetric loadout. That means there is an arm created between the 2 forces and that keeps the plane rolling the same direction.

Edited December 7, 2020 by HWasp

[Svend_Dellepude]

19 hours ago, Honey said:

 

Yeah, in the previous test I was obviously faking it to roll in the right direction with stick input. Here's another video of another test with axes widget on.

 

 

Axes widget has been obviously added in after effects. Moon is flat. Earth landing was faked. Lol.

 

Try not to correct at all and observe the plane roll past 90°.

Maybe that's how it works IRL, what do I know.

Edited December 8, 2020 by Svend_Dellepude

[Honey]

10 hours ago, Svend_Dellepude said:

 

Try not to correct at all and observe the plane roll past 90°.

Maybe that's how it works IRL, what do I know.

 

Ooh, that's what the author meant. Like when you let go of controls completely and let it into vertical dive? At that point it doesn't roll against gravity, though, does it?

[Svend_Dellepude]

You got it Einstein!

Edited December 8, 2020 by Svend_Dellepude

[RAZBAM_ELMO]

Right but if it starts rolling at that point then if the roll rate is not stable but increasing, then the roll lift and intertia would overcome gravity would it not? IM not an aeronautical engineer but knowing the basics of aeronautics and using logic thats what I would deduce.

 

 

[HWasp]

Here is a video of coffee being poured into a glass while upside down during a barrel roll. 

 

https://www.youtube.com/watch?v=V9pvG_ZSnCc

 

Heavy things falling "down" towards the ground is not always true when flying an aircraft! 

 

Again, which way the plane should roll, depends on the elevator (G positive or negative), so yes, rolling the same direction inverted can be the correct behaviour

 

 

[RAZBAM_ELMO]

Ok, so between myself and others I've had try this as well as consulting an actual aerodynamicist, I can now say with confidence that this is intended behaviour due in part to elevator position ( which includes current trim) as well as roll inertia. Marking AS INTENDED and moving to RESOLVED.