Pitch trim using binds confusion

User Support Hub Aircraft & Systems
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1

Brief description of the issue:
I binded my joystick with the buttons of elevator trim nose up and down but every single time i press it i dont know how much it moves, and its unclear also the whole pitch trim think is very weird in this game for some reason and also those bindings dont work on the 737 trim.

Does anyone know how much it moves every press? And it would be great if we can set a value we want for every press.

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2

Hello,

your topic is somehow situation to not understand how trim is functional. It differ from aircraft to aircraft, it is handled with motors f.ex. and therefore bind analog functionality to digital in some cases can be not clear. It’s also simply joined to motor with basic functionality that trim’s motor is spinning with its own speed as is defined after click trim controls (look f.ex. to DA62 stick) and therefore is hard to explain clearly why can be different and expected as functionality. I’ve tried very simply explain this system.

3

I know its function but I dont understand the bind how much it moves the wheel.

4

Ok :slight_smile:

it moves as quickly as programmer defined speed with set of trim ON :slight_smile:

5

but the binding, pitch trim nose up or down, one press how much does it move .1 degree or ???

6

What press,

your or my, how can we know what press is right, how long?

7

It’s not always the same, it depends on the plane, each one have it’s own setting.
And anyway, with the same plane, the reaction depends on flying speed.
One press will have a most important effect at high speed, and a less important one when flying slower.
So there is no real good answer to your question.
Don’t try to count the presses, just give the plane what it needs at the moment.
And let it fly a bit by itself, if you try to chase the variometer you’ll always be too late and you’ll go up and down.
First adjust it so you can take your hand off the yoke or stick, even if the plane goes gently up or down, and after it’s only very light corrections.
When not using A/P, each throttle change will need an adjustment.
Just a question of practice…

1 Like
8

Now, if you really want to know how many presses each plane needs, use the external view where you have the trim position displayed.
Move the trim completely up or down, an count the number of presses you need for the full travel.
Do this for each plane you use, as it won’t be the same number.
And after that, you’ll realize it is unuseful and was just a waste of time. :wink:

1 Like
9

Still answer generally…

10

Not necessarily. That depends on the FDM.
The trim effect can be e.g. the same across the whole speed range.

11

but the trim is in degress, every press should be like .1 degree

12

I dont understand the question, when we press the button pitch trim nose up/down how do we need to do it hold or click, and also how much it moves.

13

The problem is that MSFS trim doesn’t work like a real world electrical trim. In MSFS, after a short pause of holding the button, uses 3 different levels of speed due to acceleration after depending on how long you hold the button.

In real life the electrical trim is linear with no pauses / accelerations, unlike MSFS (or FSX if it’s the same)

In the sim, elevator trim has a range between -16,384 to 16,384 (32,768 steps)
A single click adjusts the trim by 24 steps.

Holding the button: first sends a single 24 step, and then stops and does nothing for almost a half second. Then sends the 24step pulse about 100 times a second… After 1.5 seconds at that speed, it doubles that speed… And after another 1.5 seconds, it triples it.
Instead of a nice linear increase/decrease like in real life.

Here’s MSFS:

Click and hold trim button
First, a single 24 step change
0.5 s nothing happens, then:
2400 steps / second for 1.5 s, then:
4800 steps / second for 1.5 s, then:
9600 steps / second.

Holding the button for 0.1 s does the same as holding the button for 0.5 s. But holding the button 0.6 s if hugely different compared to holding the button for 0.5 s … You see the problem with non linearity?

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Sure you can learn to trim properly with this by compensating for the “timing”, but in the end, this system doesn’t make sense compared to a linear increase/decrease like in real life.

Why make it this complicated in MSFS, when the real world systems are much simpler and easier to control…?

3 Likes
14

Sry,

but you have answer in my first post. You said you understand to trim functionality but really what to say? If you push your trim button, it will put trim motor to movement as long as you hold trim button. Therefore I wrote to you that motor of trim is spining with some maybe gearbox to have better effect or logical speed, vary from aircraft to aircraft.

15

I dont care about its speed, what i care about is how much it moves and how to keep the plane in angle i want to.

16

You maintain the pitch primarily with the stick/yoke.

With trim you gradually remove the force required to hold the stick/yoke in it’s off-center position.

How many degrees trtim moves is irrelevant.
The problem with MSFS (and FSX/P3D) is the unrealistic trim acceleration after ~1.5sec.

2 Likes
17

To summarise my post above: yes and no.
When holding down the button, You will first get a single step / change, and then nothing for 0.5 seconds.
After that, it will start moving the trim fast.
After 1.5 seconds, the speed will double.
And after additional 1.5 seconds, the trim speed is tripled.

Very counter-intuitive compared to real world electrical trims with linear changes instead of this multi-step acceleration nonsense, allegedly a relic since FSX.

1 Like
18

@ Grinde81

eeeehm,

you mean some bug with msfs as you described? heh really never observed heh maybe I’ll do tests but my explanation was only general functionality, somehow better to understand to him.

In case of really existing bug you guys mentioned, it’s another topic reason, I think.

What aircraft with this bug exactly you’ve mentioned?

19

that too, i forgot to type that it doesnt change in time, it changes after a while so you never know when its enough.

20

So divide the number of degrees by the numbers of presses needed for full travel and you’ll have your answer, if you think this info is useful.