Elevator Pitch-Up Command Induced with the THS

Device: Samsung Galaxy S23 Ultra
Operating system: One UI version 7.0
Heyo :waving_hand:! I’ve been a little uneasy about the trimmable horizontal stabilizer (THS) we have in game. For some reason, it applies a bit of pitch up command to the elevators when neither the autopilot nor I have applied any input to the elevators. The elevators should be straight (neutral) unless I specially pull back on the yoke, or the autopilot does it because of insufficient trim. I find that I have to push down on the yoke to keep the elevators straight. Here’s what I mean:



This is on other aircrafts too (mainly reworked aircraft). It’s just a bit annoying because on a takeoff roll, the plane will rotate prematurely with calibration (sets user input to 0). If I pitch down to where the elevators are neutral, the plane actually stays on the ground instead of rotating early. As soon as you let go, the plane rotates before you can neutralize your pitch input. It should be 0 input keeps you and elevator level on the runway and then your pitch up input causes the airplane to rotate. It’s not pitch down and then neutralize to rotate. Can this be noted? Thanks :blush:!

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First we need to know: why is your trim at 90% before takeoff?

A trim at around 20-30% should be ok, but 90%?!

That, of course, brings your plane to rotate too early without your counter input.

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My trim was at 90% because I was doing some playing around with my speeds in flight and I spawned back in on the runway. But the thing I’m concerned about is the elevator. Why is it moving with the horizontal stabilizer when I trim? It shouldn’t be doing that. If calibrated and no input is applied to the elevators, it should remain straight. It shouldn’t be angled with an already angled horizontal stabilizer, which is what is weird to me.

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If we do the 20-30% scenario, we still get the same situation. My elevator still isn’t straight. It’s still angled, giving us a pitch up command.

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Ah, I see. Yes, in some planes, the stabilizer moves when u trim, in some not. So in this case, the elevator moves alone to somehow reproduce the trim. Take a close look with an exterior drone if your stabilizer moves when trimming or only the elevators. I think it’s just not programmed for some planes

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It looks like the elevators do move with the stabilizers when trimming.

So there’s a difference in the whole stabilizer when using trim or ONLY the elevators?

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I believe this happens because the devs never modelled the entire elevator to move, only the bits at the back

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Well, based on how you worded it, the whole stabilizer moves (if you’re including the elevators) when using trim, not only the elevators. The horizontal stabilizer itself should be the only thing moving with trim, not the elevators. That’s controlled directly with pilot/autopilot inputs on the yoke.

I’m confused on what you mean. The elevators are modeled to move when setting trim when they aren’t supposed to. The elevators are the bits at the back of the wing.


https://youtu.be/ZdTnTKGBWbs?si=g65YipNXLllq8Vyk

My bad, I mixed up elevators and horizontal stabilisers. What I meant to say is that, in real life the ENTIRE stabiliser moves. But in IF the devs never actually modelled that, so trim makes the elevators move instead.

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In some newer aircraft models, trim moves the stabilizer correctly—but the elevators are still linked to trim, which they shouldn’t be. As a result, even with zero elevator input, the elevators are still physically deflected, causing an unintended pitch-up command. This creates a misleading situation: What appears to be “neutral” elevator is actually pitching the aircraft. Visually, you can see this on the model—the elevator surfaces move even with no pilot input. This causes overcorrection during flight. The stabilizer already handles trim, so the elevators should remain unaffected unless the pilot gives a direct input. Keeping them linked just adds unnecessary and conflicting pitch forces.

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I’ll also add some new aircraft models don’t actually have their elevators simulated and it’s actually the horizontal stabilizer if you look really closely. So when you pull/push on the yoke, you’re raising the horizontal stabilizer, not elevators. On older aircraft, the stabilizers aren’t simulated, so they use the elevators. Makes sense for now, but follows the same situation.

You are right.
We’ll look into this.
Thanks for bringing this up. :slight_smile:

That shouldn’t be the case.
Which aircraft do you see this on?

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It’s mainly on the propeller planes like the C208 and TBM930. The Cessna 172 does have the elevators modeled, but it looks like it is only on the right side. It doesn’t look like it has an elevator on the left.



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That’s correct. :slight_smile:

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If I put my trim to -100% it starts going straight

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Never knew that😅. It just looked weird seeing it on one side. But, I guess it can still be thrown in with aircraft with their elevators linked with THS. Based on the images, it seems the elevators are independent of the THS, not a synced up/ down movement with the horizontal stabilizer.

Are you sure it’s without your yoke input? If so, which aircraft?