Asymmetric takeoff trim

[Dingle]

Hi,
In the videos about starship it's being discussed that the trim for takeoff is not asymmetric.

May the reason be that the engines turbine spin in the same direction or asymmetric weight distribution of cabin interieur?

Does anyone have more information on that?

[John S.]

This post is deleted!

[Dingle]

To collect information in the same place, here is the the screenshot posted by @John-S.

[Dingle]

@Black-Square,
Do you happen to know if the engine rotates in the opposite direction of the props? When considering the prop direction I would have assume a left wing down moment on takeoff...? Or maybe my physics is off

[Randolf]

This post is deleted!

[Randolf]

Sorry I've misread your post, thought you're talking about counter-rotating props

[Dingle]

@Randolf As far as I understand it, both engines and props are turning and have an angular momentum which exert a torque when the aircraft pitches up. But, if I am not mistaken, the props spin in a CCW fashion when seen from the rear. As the engines are behind the main gear they would be moving down and would therefore induce a yaw to the left. That would mean the right wing moves faster creating more lift, rolling the left wing down. So if the engine is spinning in the same direction, that would make matters even worse. If they spin opposite and have a larger angular momentum than the props, they can induce that left wing up roll. But that's why I was curious in which direction the engine rotate. Or even worse, as the engine has two shafts they can also be rotating in opposite directions as well

[Dingle]

The above posted image is from this source

[DrVenkman]

Not sure what this topic is really about? Just look at the roll trim indicator in the aircaft: the Takeoff range is quite substantially left-wing down.

[Dingle]

Well, what's the source for it. It's just a technical question as I would like to understand the source for it. Additionally I did not notice much roll on takeoff when trimmed neutral.