Trim Issue

[Avio]

I know this topic has been discussed much and I think I understand the procedure needed. However, for me the issue is with the almost instantaneous input feed BEFORE I have time to fully return the stick and rudder to centre the moment the trim button is pressed and released, causing sudden unexpected flight movement.

 

Have not encountered any such issue with the Huey. The trim delay timing for the Huey seems more reasonably set and there is enough time to allow for stick return to centre, thus not causing any unexpected result.

 

Hope to hear some input on this. Thanks.

[nickexists]

this used to bother me so I switched on the center stick trimmer mode in the miscellaneous options. Now I've turned off Center stick trimmer mode and I am no longer and bothered by the problem. if you keep at it you will eventually figure out the time you no longer be bothered by it, or you could use the center stick trimmer option

[BitMaster]

There is not much you can do about it other than trim more often in smaller increments to minimize the AP's input and/or trim the chopper while in FD mode.

There will be no additional input if you are in FD mode.

 

You should not take off vertically, stabilize at 30m and then kick in full forward and trim it there.

That will cause a dive you can call yourself happy if you make it out with just a ripped of Shkval.

 

INSTEAD, trim it in 5+ smaller steps up to the desired spot and do little corrections while the AP tries to oversteer....also looks way better when someone watches in F2 ;)

 

I mostly fly in FD mode whenever I have to maneuver and kick in AP and H only when I am a sitting duck aiming other ducks or in friendly area traveling long distances at modest altitude.

 

 

Bit

 

 

 

 

Bit

[tsumikae]

You'll get use to it, eventually. Right now, I can't notice the re-center process anymore, even after a wide input.

 

Do as BitMaster says, as it it a precise way to control the amount of counter react you'll get. This way you'll get a feel of how far you can go with the stick before entering the bump zone.

 

In time, you'll notice that you'll allow yourself wider moves, and they will be a lot smoother too. It won't be as harsh as it is now. Now, I suppose it's close to that sequence for you: hold trim - move stick - hold stick position -release trim - let go stick. This is not fluid enough, hence the bumps. You'll end up mixing all those processes in a very smooth manner, after some practice.

[Avio]

Hmmm, more new things to learn. I'm currently not on my PC. So far I've only tried flying in the Free Flight mission. Is that one considered to have FD on or off I wonder? And I assume in that mission the autopilot is actually "semi-auto" on?

 

Still trying to get a grip with this trim thingy.

[tsumikae]

Hmmm, more new things to learn. I'm currently not on my PC. So far I've only tried flying in the Free Flight mission. Is that one considered to have FD on or off I wonder? And I assume in that mission the autopilot is actually "semi-auto" on?

 

Still trying to get a grip with this trim thingy.

 

 

Tell you what: send us a track of you trying to handle that trim. I'm sure we'll be more helpful that way, as we'll see what you could do better ;)

 

On a sidenote, to avoid confusion, FD mode is (yet another) autopilot mode in the KA. It stands for "Flight Director". This mode uses the currently active AP channels to smooth your control inputs and make the helo much easier to fly. But it overrides the AP channels 20% authority over the controls, which means that if you re-center the stick, the helo won't try and get back on the trimmed attitude.

 

This is a great way to free-fly and chill out, but also to use your rockets, actually.

Edited September 10, 2014 by tsumikae

[Avio]

Okay will give it a try. Thanks.

[SnowTiger]

"Flight Director". This mode uses the currently active AP channels to smooth your control inputs and make the helo much easier to fly. But it overrides the AP channels 20% authority over the controls, which means that if you re-center the stick, the helo won't try and get back on the trimmed attitude.

 

I have been trying to wrap my head around all these AP Modes, FD and Trim over the last 2 weeks and I'm about ready to pull my hair out.

 

Could you please try to Re-Phrase your explanation of the Flight Director's effect on AP ?

I don't get the statement "the helo won't try and get back on the trimmed attitude" !!

What do you mean by that ?

Why Doesn't it "get back on the trimmed attitude" ?

Isn't that what it's supposed to help with ?

 

Obviously, I still have a TON of Practicing to do before anyone is going to want to fly with me. Flying AGAINST ME ... well that might be another story !! Anyone need some Moving Target Practice ??

[nickexists]

Flight director mode is used to disable the auto pilot. The auto pilot channels will still damp out oscillations but they won't try to control the attitude. I find this mode useful for strafing runs or ocassionally for close up a-a gun battles.

[Flagrum]

I have been trying to wrap my head around all these AP Modes, FD and Trim over the last 2 weeks and I'm about ready to pull my hair out.

 

Could you please try to Re-Phrase your explanation of the Flight Director's effect on AP ?

I don't get the statement "the helo won't try and get back on the trimmed attitude" !!

What do you mean by that ?

Why Doesn't it "get back on the trimmed attitude" ?

Isn't that what it's supposed to help with ?

 

Obviously, I still have a TON of Practicing to do before anyone is going to want to fly with me. Flying AGAINST ME ... well that might be another story !! Anyone need some Moving Target Practice ??

Have you read these?

DCS: Black Shark and the Trimmer

DCS: Black Shark – Autopilot: Part 1

DCS: Black Shark – Autopilot: Part 2

 

But to answer your question at hand and to complement what nickexists already said:

The AP/Trim mechanism of the Ka-50 consists of two main functions: dampening and autopilot. If the AP buttons on the right side are lit, then dampening of your control inputs are happening for the respective channels. That helps to prevent pilot induced oscillations and makes attitude changes more smoothly. If you disable all channels, it is more like balancing a billard ball on top of a billard queue.

 

Additionally the AP tries to keep the helo in the attitude where you trimmed it to (i.e. trim button). This can be disabled by enabling the Flight Director mode. That means, the AP does not add control inputs to the controls to archieve the trimmed attitude, but instead it just displays cues on the hud that direct you as pilot of how to maneuver the helo to archive the trimmed attitude.

Edited September 28, 2014 by Flagrum

[SnowTiger]

Hi Flagrum

 

Your explanation clears it up for me quite well. I appreciate that.

 

I have watched several videos and have done a ton of reading, but some of what I read and/or Practiced, just didn't seem to work as I understood it was supposed to work. But then the Flight Director is/was the function that was throwing me off the most.

I will just have to fart around with it a bit more to really thoroughly understand it's affect and importance.

Certainly your explanation pretty much puts it in a nutshell ... which is exactly what my wee ADD mind needed.

 

Thanks again.