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HomeAircraftHelicopterAerial Photography and Video › Helicommand trim problem
01-19-2009 01:53 AM  9 years agoPost 1
Donnio

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Fremont, NE

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I've got a 3a mounted on a Ion X camera ship. Everytime I hit the trim switch, the heli jerks momentairly in the same direction that I am holding the cyclics to keep it level. I am only using horizontal mode, it's quite annoying and the folks @ Helicommand say this is not normal, but don't have a solution. It has done this since I got it and have gone thru the setup several times. Can't figure it out. It seems to hold pretty good, but not sure it's that much better than my FMA Co-Pilot. Any suggestions or ideas would be great.....

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01-19-2009 02:04 AM  9 years agoPost 2
nooobs

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01-19-2009 06:53 AM  9 years agoPost 3
Jesper

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Sweden

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Mine does the same thing - I thought this was normal. Other than that it works very good. I sent it Captron two weeks ago for an uppgrade, will see if it still does the same thing now when the software has been updated.

/Jesper

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01-19-2009 09:30 AM  9 years agoPost 4
Louisiana Aerial Imaging

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Lafayette, Louisiana USA

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Mine does the same thing. I believe it is just "calibrating" to level.

Thats what it is supposed to do. Its normal.

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01-19-2009 03:22 PM  9 years agoPost 5
SkidMan

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Orlando, FL USA

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My guess as to what is happening is this:

When you hit the Auto-Trim HC takes the current inputs and "zeros" on them. Once you release the Auto-Trim the stick input is essentially doubled; once for it being added to the "trimed" values in HC and secondly for what you are inputting with the stick.

Can someone who knows more about HC than me confirm or deny this?

Paul

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01-19-2009 03:25 PM  9 years agoPost 6
Jesper

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Sweden

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That's what I was thinking as well. Would make sense.

/Jesper

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01-19-2009 09:32 PM  9 years agoPost 7
SkidMan

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Orlando, FL USA

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Mine does the same thing - I thought this was normal. Other than that it works very good. I sent it Captron two weeks ago for an uppgrade, will see if it still does the same thing now when the software has been updated.
What upgrade are you getting. Just a software version or from one model to another?

Paul

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01-19-2009 09:40 PM  9 years agoPost 8
Jesper

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Sweden

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I am getting it upgraded from 3A to Rigid. /Jesper

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01-20-2009 03:29 AM  9 years agoPost 9
Donnio

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Fremont, NE

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I got this back from Joachim of Captron after sending him a video of my problem:

Hi Don,

This jump is totally logic, I got what you mean, and as soon as you know and technically understood what the autotrim does, you will recognize that yourself, I am sure.

So I will try to explain: the situation you filmed shows that you have to hold let's say elevator more to the front and aileron to the right, let's say each for 15° (imagine the swash was 15° out of level in these directions). Ok, now it gets level as long as you hold the sticks and correct the swash's position manualy, for 8-10 seconds. Now you push the autotrim. The autotrim now instantly sets the new middle values. But as you still hold the sticks right in the moment of learning these new middle values, the swash of course will go further than only to the middle, as your stick signals now tell the swash to move out of center by the 15°. First time when you release the sticks now, the swash will go to the newly learned middle and stay level, just as your video shows. So everything is working perfect.
I hope this sounds simple and clear to you :-) Difficult to explain by writing and not having a live video stream.
So what you have to do is release the sticks right after pushing the autotrim. The more simultanious this is done, the less the swash will jump.

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01-20-2009 03:41 AM  9 years agoPost 10
rerazor

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Mich.

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Yep, all my HC units do this. After awhile it just becomes normal and second nature. At first, it would get your heart racing but now I don't even flinch.

Robert

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01-20-2009 03:46 AM  9 years agoPost 11
nooobs

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01-20-2009 10:57 AM  9 years agoPost 12
Donnio

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Fremont, NE

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I'm new with Helicommand and not sure if the unit is working correctly. Once I get the unit in trim by trimming several times, each time getting closer to a steady hover, but it seems as though it always wants to drift away in any direction, forward, back, left or right. It is very unusual that I could hover in stabilization mode for more than 20 seconds without it drifting with a snowball effect and quickly into the ground. I've heard some say they put the transmitter down for 30 seconds and watch their monitor. Mayby I'm just not trimming accurately enough, I hold hover for 8 seconds, then trim. I know wind does not help, but it does not necessarily drift with the wind. Just want to know if this is normal....

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01-20-2009 11:04 AM  9 years agoPost 13
Jesper

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Sweden

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I've heard some say they put the transmitter down for 30 seconds and watch their monitor.
I belive that would only possible in position mode, and close to the ground.

/Jesper

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01-20-2009 02:01 PM  9 years agoPost 14
Louisiana Helicam

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West Monroe, LA

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I autotrim mine on the ground while it's perfectly level. Then, I'll autotrim once during a solid hover. It's good from there on out. I do this every couple of jobs.

www.louisianahelicam.com

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01-20-2009 02:06 PM  9 years agoPost 15
Jesper

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Sweden

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I use the autotrim mainly to compensate for varying wind conditions. When turning from upwind to downwind etc, I use the autotrim function to reduse the amount of cyclics required to counter the wind. This means that I toggle the autotrim several times each flight.

/Jesper

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01-20-2009 02:10 PM  9 years agoPost 16
nooobs

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01-20-2009 02:18 PM  9 years agoPost 17
rerazor

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Mich.

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and/or any CG change.
I still like to clear out the autotrim settings and do the SET button procedure every few months. I don't know exactly why but my theory is to help to re-center all the gyros that can drift over time. Yes, the autotrim should do this but that is just what I found over time.

Robert

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HomeAircraftHelicopterAerial Photography and Video › Helicommand trim problem
01-20-2009 02:27 PM  9 years ago •• Post 18 ••
GyroFreak

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Orlando Florida ...28N 81W

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I also get the 'Jerk' when autotriming. If I do it several times the twitch gets less and less since the stick correction input is less each time.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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