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HomeAircraftHelicopterBeginners Corner › AVCS on Futaba GY240
02-07-2006 12:40 PM  12 years agoPost 1
Hammer1

rrNovice

Duluth, MN

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What does the AVCS do?

I have been chasing a binding problem in the tail since I built my trex 450. I have replaced the plastic parts with CNC thinking that was the problem but it wasn't. I have NO binding until I put the horn back onto the servo (futaba s9650) I then noticed that the sevo was doing the same thing as the tail blades (not centering) so I tried to switch the AVCS off and everything seems fine now.

What will happen if I fly without it? why is it doing that? what is the purpose of AVCS?

I have flown many years ago but when I got out of it we were using the old mechanical gyros so this is all new to me.

Any advice for a new old timer??

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02-07-2006 12:42 PM  12 years agoPost 2
z11355

rrMaster

New England

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are you saying......

when I turn on AVCS, the servo arm doesn't return to center
like I think it should after I flick the rudder stick a bit?


If that is the case, welcome to AVCS. It's doing EXACTLY what
it should be doing. It doesn't return to center (on the ground).

when in the air, it all works just fine.

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02-07-2006 12:45 PM  12 years agoPost 3
Hammer1

rrNovice

Duluth, MN

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So what your saying is that I should spool it up and give it a try? I have not done that since I replaced the tail components thinking that I had something else going on.

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02-07-2006 12:50 PM  12 years agoPost 4
z11355

rrMaster

New England

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all I'm saying is that your concern about lack of re-centering
is misfounded.

whether you set everything else up right, well, thats a different
story.

you didn't try to use the rudder channel ATV to set the physical
limit of throw, did you???? (big mistake).

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02-07-2006 12:53 PM  12 years agoPost 5
Hammer1

rrNovice

Duluth, MN

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NO I did not but that thought did cross my mind,I thought I would ask first and sounds like I made the right decision. LOL!

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02-07-2006 12:55 PM  12 years agoPost 6
z11355

rrMaster

New England

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if you think you got it right, particularly the direction
setting of the gyro & servo, then set the gain to around 50%
and give it a go.

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02-07-2006 12:58 PM  12 years agoPost 7
Hammer1

rrNovice

Duluth, MN

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Sounds good! I appreciate the encouragement!

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02-07-2006 01:45 PM  12 years agoPost 8
SkateFreak

rrElite Veteran

Cambs UK

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Hey,
Yeah, can i jst enquire.
I'm guessing the reason it dosnt return to center is because your in HH and thus it wont return untill the tail moves to the "correct" position from the perspective of the TX imput?

Would that be correct?

-Jvr

Non-3D heli pilots are planker spys trying to bring down the heli community from the inside - Topher

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02-07-2006 01:48 PM  12 years agoPost 9
z11355

rrMaster

New England

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basically.

in HH (AVCS) mode, you're asking the gyro to establish a
specific turning rate. Obviously on the ground, the machine
ain't gonna actually do that while in the air it will.

So, the gyro keeps commanding.

this is also why the first HH tended to 'drift' on the ground.

The unit would issue a small correction on the ground and notice
that the machine wasn't doing it, so the unit would keep increasing
(ie. drift) till it got to maximum.

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02-07-2006 08:55 PM  12 years agoPost 10
Drunk Monk

rrProfessor

Preston, UK

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If you are worried about your set up in avcs mode but think it is right in normal mode, then just spool it up in rate/normal mode and give it a hover. If all is well then switch it to avcs mode and retry.


Stephen

I only open my mouth to change feet.....

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03-20-2006 07:11 AM  12 years agoPost 11
good2win22

rrNovice

Fort Wainwright, Alaska

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I just got my trex going this week and having an issue with the GY240...

With the AVCS turned off, I have the thing holding like a champ. The servo horn is perpindicular to the servo, the slider is centered on the tail shaft, gain is just above 75% and all trims on the the radio are centered or close to it (-6% on CNT for rudder channel on Airtronics RD8000)

When I disconnect the battery and then turn on the AVCS, then power everything back up, I have to put in a tremendous amount of Left rudder stick when pulling back into a hover to keep the tail in one place. I put her back on the ground and played with the CNT on the radio and ended up putting in +46% just to get here to stop drifting and the rudder gimble centered. I would think that I would like to have the servo arm perpindicular with the servo so I can get equal amounts of travel on both sides of the horn. Also, I did play with end points to keep the slider from binder on the shaft, maybe that has something to do with it.

https://rc.runryder.com/ [/img]

If anyone out there has some insightful input, I would greatly appreciate it.

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