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Old 12-17-2018, 06:54 AM   #1
Z4ng3tsu
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Unhappy Autopilot going crazy

Hi everyone !

I recently fly back on the Mi-8 and I was facing an issue I didn't have before.
I do the starting procedure as always, no problem. Before taking off I activate the autopilot for the pitch & roll I can fly without any issue.

But usually I used the autopilot heading too. In my memory it helped me to keep the chopper with the rudder, was not active when you give some rudder and is automatically set to the direction when you don't put rudder anymore (I can still see that with the autopilot light turning off and on when I apply some rudder and then release it).

Now, I don't know why, when I release the rudder after a turn, most of the time the "rudder/heading autopilot" is going crazy and set the rudder full left or full right... Making the flight absolutly horrible.

Is there anything I'm doing wrong ? Because some months ago, I was flying it so easily I don't understund why it's happening now...

Thanks for your answers.
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Old 12-17-2018, 09:39 AM   #2
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Just saw a video about autopilot. Seems my rudder is trimmed a lot sometimes. Is it needed to reset this trim frequently in order for the autopilot to not fight it ?
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Old 12-17-2018, 02:01 PM   #3
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Why the deleted message ? You were suggesting to turn off the rudder trim in the options. What is the closest to reality, option on or off ?
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Old 12-17-2018, 04:12 PM   #4
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well I trim out before I ever activate the auto pilot, then any small rudder movements never seem to bother it, but if I'm going wildly of Couse say due to the AP trying to fight me or the wind lets say I will stop it, re align the re activate, never had a problem that way
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Old 12-17-2018, 04:28 PM   #5
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Quote:
Originally Posted by thrustvector View Post
well I trim out before I ever activate the auto pilot, then any small rudder movements never seem to bother it, but if I'm going wildly of Couse say due to the AP trying to fight me or the wind lets say I will stop it, re align the re activate, never had a problem that way
I'll try this asap thx ! If possible, I'll upload a video of my problem if it persists.
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Old 12-17-2018, 04:39 PM   #6
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hope it works for you
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Old 12-18-2018, 12:42 AM   #7
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This is the same problem I'm having with the Shark. Rudder seems to pull HARD when maneuvering and trimming often. Seems to build up energy until it becomes uncontrollable and seems to just "snap". Must be something in the new engine. As I'm trying to lock up an air target, the helicopter suddenly seems to just loose control and start spinning hard and wildly, no matter how much I push back against it with the rudder.


EDIT: Well, I found out that we are supposed to hold down the trimmer while we are moving the cyclic, and then release it. Seems to work well in slow, easy flight. I'll test tomorrow how it does in fast maneuvering and trimming, and whether I still get the mysterious build up of torque energy. Might be better to do fast maneuvers in FD mode, where there is just damping.

Last edited by 3WA; 12-18-2018 at 08:30 AM.
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Old 12-18-2018, 10:17 AM   #8
Z4ng3tsu
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I tested for the Mi-8. It seems to work a little more when keeping the trim button pushed when changing course. But the most effective is to reset the trim after a turn and then trimming the aircraft.

I'll do some more tests to find the most effective way. For the KA-50 I was already doing this. Especially when you pilot with the trim setting your current autopilot course.
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Old 12-18-2018, 10:32 AM   #9
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I think a lot of trimming is totally up to the individual player on how they trim or what method, I continually trim so I suppose I don't see so many errors, but yes even in a hover the old shark will move a bit
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Old 12-19-2018, 05:38 AM   #10
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Quote:
Originally Posted by Z4ng3tsu View Post
Why the deleted message ? You were suggesting to turn off the rudder trim in the options. What is the closest to reality, option on or off ?
As a matter of fact I WAS suggesting just that. I deleted because I started to think I misinterpreted your issue.
My pedals do not self center, so I prefer no rudder trim.
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