Hello, I know that when there’s a line that goes from green-orange-red on the trim button, it indicates your neutral position:
But sometimes it’s an arrow with an arrow head blinking.
What does the arrow mean? If it’s pointing up/down, and if it’s green/red, and it can be a combination of both.
I’ve been trying to test it on the ground. Seems like i can easily trigger the arrow to appear when I set the ALT on.
Any ideas?
IDK how to share the video (showing the arrow), so here: Dropbox
The lines and arrows indicate if you should trim up or down. If the line/arrow points downward, you need to trim up, and vice versa. On the ground, it’ll read your yoke inputs sensitively, hence what you saw in the video – ideally, you should just have your trim set to your departure trim setting when on the ground.
You may find the tutorial below to be helpful.
Thank you, that might have been common sense but I didn’t think to try that. Will try. Thanks!
I don’t know if it’s really an issue or not, but I found some of the above wording a bit confusing.
What does “new datums” mean to a typical user?: “re-calibrating regularly” and “using trim” are both related but at the same time, somewhat separate concepts.
Re-calibrating sets the neutral point for trim, while trim sets the offset from that neutral point(?).
Re-calibrating maintains the integrity of trim (in terms of some variability due to device limitations); while trim relates to aerodynamic changes in pitch forces with flight configuration (gear, flaps etc.), and IAS?
Not only that, but it’s more likely than not going to be a difference between calibrated neutral and your actual pitch, because how else are you going to fly the plane? It should be made clearer that the line will be magenta once the difference is significant or outside what would be considered normal.
Sol, Welcome to the community!
I’m not sure but I may be causing some confusion in how I use the word “neutral”?:
Trim is used so that the tilt of your device for control input is not at an uncomfortable angle in achieving your goal: a particular pitch angle you currently need for your aircraft.
Calibration is a device level fix (correct me if I’m wrong someone), to reset natural drift that regularly occurs in our device’s ability to know what is the “anchored” orientation to our actual spatial surroundings.
By saying:
Do you mean aircaft pitch (what you see on screen), or device “tilt” (the actual angle you hold your device)?
When I say “neutral”, I’m only talking about trim’s neutral (or center) position (as control input info), not aircraft pitch. (actual aircraft pitch angle is the goal; trim, and its different range of settings from “neutral” are your aid in comfortably holding the aircraft pitch angle).
Trim is about aviation and flying (simulating actual aerodynamic forces pilots have to manage); calibration is about the physical and engineering limiations of our table and phone devices.
(Perhaps too much info?)
I’m sorry, I should’ve been clearer.
“Actual pitch” in this case was meant to be “Commanded pitch” as in the control input.
“Calibrated neutral” (The way I used it, which could be wrong) basically meant no correction/commands regarding pitch, as in no green/magenta line.
I did use the term “Calibrated neutral” incorrectly, but I was referring to the device not providing any correction to any control surfaces.
Sorry if I used the incorrect terms, I hope I am better understood now.
All good, thank you. There’s actually a lot of things going on with trim, pitch and calibrate. I was just testing, and I noticed (for the first time maybe, after lots of prior use), that the trim indicator suggestion goes into action when you simply apply a pitch control force, even though you were properly trimmed beforehand for all other current conditions.
So, the trim indicator, it seems, is suggesting how to remove control input forces, not just how to be at neutral trim for the current (non-pitch input control) flight state.
Not so easy to express and causing a double-take to think about from me. But I think I, hopefully, understand the implementation need.
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