Trimmer

[happyslayeruk]

Had this sim for a week or so now and have manged to get the basic handling sorted. I can now get from A to B (albeit sometimes via C and D :music_whistling: )safely and no more surprise crashes.

 

My only problem is the trimmer. I am using the new version (press trim, release trim then centre the stick), all seems to work well except when I've just come to a hover. I manually get to a hover but when I press the trim the aircraft immediately pitches up. The trim behaves as it should in all other cases just a problem when I trim in a hover.

 

Has anybody else noticed this or have an explanation?

[ARM505]

Yes - I've noticed it.

 

No, I've no idea why :)

[Bulletstop]

Are you going into auto hover mode? Also what is the airspeed, if you are going into auto hover be below 10knts. then it does not pitch up as hard.

 

 

I hope that helps.

Bullet

[happyslayeruk]

It happens when I come into a hover manually no airspeed. I might have some small forward or backward cyclic to keep the hover, so I press trim so I can centre the stick, thats when it pitches up.

[Dejjvid]

I've never experienced this pitch up problem.

 

I slow down, when at around 5kph in airspeed, (still have 5-10 degree nose up) i press auto hover. When the nose dips down to horizontal, i press and release trim again fast, to set a new hover point and the heli stays there.

 

The other way i use is to slow down, when at 1-2kph, i pitch the nose down to horizontal, press auto hover, and she stays there.

 

post a track and we can see what happens.

[Bulletstop]

When I manaully hover I do not trim, I continue to hold the trim so I have never had it happen to me, Also I use the old style trimmer.

When entering the auto hover which is what I usually do I am at a very low speed to no airspeed.I hope some other folks have a good Idea.

 

 

 

Bullet

[Beagle One]

I use the old trim again and have the trim button on the "pinky switch" on a Saitek X52...for manouvering I simply press it with my little Finger and hold it...I release it when im done manouvering...and all is fine for me. I cant work with the new trim system at all.

[Haril]

My only problem is the trimmer. I am using the new version (press trim, release trim then centre the stick), all seems to work well except when I've just come to a hover. I manually get to a hover but when I press the trim the aircraft immediately pitches up. The trim behaves as it should in all other cases just a problem when I trim in a hover.

 

Has anybody else noticed this or have an explanation?

When you're flying forwards normally, the helicopter is pitched nose down. When trimmed at this attitude, the autopilot will try to maintain this nose-down attitude.

 

When you pull back to enter the hover, you're changing the attitude to nose up. The autopilot tries to counter this by adding some nose down stick. You then counter this counter by adding more nose up stick.

 

When you've stopped and are hovering, the nose is still above the location it would be if you were going forwards, so the autopilot is still adding nose down stick to try to get the attitude back to where it was, and you're still pulling back to counter this.

 

When you hit the trimmer, the autopilot lets go and stops trying to lower the nose. All that's left then is your back stick, which causes the helicopter to pitch up.

 

To avoid this, don't manouver the helicopter without first holding down the trimmer. If every stick movement is done with the trimmer held down, you won't experience jolts like this. Real Pilots can tap the trimmer as they're going through the manouver, but then Real Pilots don't have to recentre the stick every time they press the trimmer.

 

Hope this helps.

[happyslayeruk]

Thanks Haril, that was a good explanation. Just did a quick test flight (Joys of working from home :) ) and that certainly made transitioning to a hover a lot easier.