AR7200bx drifting on hard collective climbs

[rich-6]

I'l start off by saying im a fbl noob!

I've been out to maiden my 600 pro today with the ar7200bx fitted to it, I only took one pack incase I had a little mishap Good news is it survived

While attempting to set the tail gains, On a hard collective punch the swash isn't staying level throughout its full motion, the Heli is drifting over to the left. When I had it setup with a flybar you would use your endpoints to make sure everything was level throughout but the manual states in bold do not use any trims and it also states that adjusting your endpoints just adjusts your roll rates.

I've read the manual over which is very good but doesn't mention how to level it at top and bottom stick, so I'm a bit lost with it how I can correct the drifting issue I have, I would have assumed that the gyro would know it was drifting and correct itself hence why they only tell you to level at mid stick.

It was all set up with servo horns at 90, The swash was leveled by adjusting the links and finished off in Menu G till it was level at mid stick, In a hover it will hover hands off it seems to be better than my flybar setup.

Current setup is an EFL head with black dampeners and 600 FB blades (until I order some FBL ones), I have around 30% expo dialed in my tx as it was very sensitive and it's on the stock 3m pad with a velcro strap around it.

Heli doesn't seems to suffer with vibes, Once it's airborne everything tracks and runs as it should.

Other than that I'm very impressed with it at stock settings it goes like a rocket.

[tomatwalden]

If it drifts on high collective, it's probably that one servo is binding at full throw before the others. If I recall correctly, one of the last steps (step L) in the setup of the BeastX is the cyclic swashplate limit. At that step, you should check for servo binding at full negative and full collective, with all reaches of cyclic at the same time. If you get a servo binding at the extremes, lower the cyclic ring value.

[rich-6]

If it drifts on high collective, it's probably that one servo is binding at full throw before the others. If I recall correctly, one of the last steps (step L) in the setup of the BeastX is the cyclic swashplate limit. At that step, you should check for servo binding at full negative and full collective, with all reaches of cyclic at the same time. If you get a servo binding at the extremes, lower the cyclic ring value.

Hi Tom, thanks for replying.

I've had a look over it again, I couldn't see or hear any binding with the head on at full positive or negative and having a slow stir of the sticks at the same time nor could I see the swash jumping or doing anything it shouldn't have been. I've gone back into menu L with the head off and taken a little bit of travel off as it was a hair from a servo case.

Now I have the head off I've also put my swash leveller on it, at low stick It's touching all 3 points on the swashplate, mid stick the same but at full positive the right hand servo looking from the boom is travelling further than the other two servos and pushing the swash leveller up, It isn't much maybe 1/2 a mil which I'd have thought the bx would have corrected it.

If I was to level the swash mechanically at the top, which is going to require me buying some turnbuckles to get it perfect and then level the swash electronically again in Menu G do you think this could solve it? It's a pain you cant limit it via the transmitter cause it's only the one servo

[Raving Jim]

Check all 3 links are the same overall length from hole centres with your vernier an level your swash at that, if geometry is correct it shud travel equally top an bottom when you pitch up an down .

[tomatwalden]

. It's a pain you cant limit it via the transmitter cause it's only the one servo

Well, you can limit pitch in the servo menu on your TX. You can't modify individual servos though, no - because the eCCPM mixing is done internally by the BeastX. As Raving Jim points out however, all things being equal, the servos should travel exactly the same, as controlled by the BeastX. If one is travelling further, it would seem to indicate that it is setup mechanically different to the other two.

For what it's worth, I've never had a problem with the AR7200BX not giving a level swash throughout the collective range. Perhaps check that the servos are as close to mechanical 90 as possible?

[rich-6]

Sorted it

I narked it up before a tad more than likely because i was setting it up at 3am

I had a link that was ever so slightly longer from the servo to swash as you suggested Jim which I must have accounted for with subtrim when I had the flybar on, I couldn't get it close to the other one so I've being making links up to get 2 as close as possible out of my spares.

I've reset my 90s on my servo arms in Menu G too Tom, Adjusted my links mechanically to level it while I had a servo selected then checked the swash at low mid and high and its perfect.

Something was out and doing as you've both suggested has sorted it out so Thank you, Hopefully I'l be back out for another flight tomorrow, I'll check my 0 degree pitch now I've made adjustments and reset my limits as per the manual.

[rich-6]

Today's flight went well, I did the same as yesterday to test it out. I started off in a solid hover then hit full pos collective It went straight up like a rocket with a bit of a tail kick, which I'm sure I'll be able to dial out when I set the tail up in rate mode and get onto setting pot #3.(Following the MB tuning guide on HFreak)

Today was only a quick flight to test it sorted it out, I've got my tx gain just under the point of the tail fluttering in a Hurricane, It Piros 360 right then straight back into 360 left and stops like a rock and has no hesitation. Really happy with this unit