Maiden exo hover, felt a little drifty. - HeliFreak
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Old 06-28-2017, 11:43 PM   #1 (permalink)
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Default Maiden exo hover, felt a little drifty.

Was dark. So we didn't hover more than 20 seconds or so. The builder followed the threads on here. He elected not to ream the ball joints to let the high torque servos break in manually. Would this explain some of the drifting action we had ? There wasn't a whisper of wind. Never had a brand new heli. So I'm new to brand new machine. Is this common for a new machine ? Or typical for this machine at all ? Anyone else experience this ?

Equipment as follows:
Mks hv minis
Jive100lv
Pyro 940kv
Jeti diablo - no expo - rex7 receiver
Brain2 - on sport mode
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Old 06-29-2017, 01:36 AM   #2 (permalink)
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Tight ball links don't tend to cause drifting, plenty of other issues but not drifting. Swash level is usually the issue or sometimes vibrations confusing the FBL.
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Old 06-29-2017, 03:50 AM   #3 (permalink)
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Quote:
Originally Posted by Crashalotjoe View Post
Tight ball links don't tend to cause drifting, plenty of other issues but not drifting. Swash level is usually the issue or sometimes vibrations confusing the FBL.
I would concur on setup issues. Leveling the swash is the biggie here.

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Old 06-29-2017, 05:15 AM   #4 (permalink)
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What head gain and what fbl unit?

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Old 06-29-2017, 06:19 AM   #5 (permalink)
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Did you test hover it out of the rotor wash? like any other well built heli, the exo should hover hands off for a few seconds. i didn't ream my links as well,i just fly it as it is.

isko
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Old 06-29-2017, 06:45 AM   #6 (permalink)
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For everyone who didn't ream their links (like me), please check ball tightness regularly. The last thing you want to have happen is to have a ball back out while you're wearing in the link.

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Old 06-29-2017, 11:09 AM   #7 (permalink)
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IMHO a 20sec test hover in the dark is not much to go by. Fly a few packs and then you will see if it still feels loose. Might just need to bump up cyclic gains to keep it locked in.
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Old 06-29-2017, 03:41 PM   #8 (permalink)
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I respectfully disagree with Crashalotjoe here,

Tight ball links WILL cause poor centering and drifting!

I did not ream the links on my Atom when I first had it, based on advice I was given. I could not get it to sit still in the hover-it would drift back and forth, left and right.

Reaming the links for proper fit corrected this immediately.

Tight links prevent subtle motions of the servos to be transmitted to the head-they bind then when they finally let go, it overshoots. It gives a feeling that the ship will not settle down in the hover.

I hand fit the links on EVERY machine I build, regardless of manufacture.

Neither of my eXo's have any issues with drifting-both are completely solid in the hover and in all areas of flight.
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Old 06-29-2017, 10:35 PM   #9 (permalink)
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Quote:
Originally Posted by Ah Clem View Post
I respectfully disagree with Crashalotjoe here,

Tight ball links WILL cause poor centering and drifting!

I did not ream the links on my Atom when I first had it, based on advice I was given. I could not get it to sit still in the hover-it would drift back and forth, left and right.

Reaming the links for proper fit corrected this immediately.

Tight links prevent subtle motions of the servos to be transmitted to the head-they bind then when they finally let go, it overshoots. It gives a feeling that the ship will not settle down in the hover.

I hand fit the links on EVERY machine I build, regardless of manufacture.

Neither of my eXo's have any issues with drifting-both are completely solid in the hover and in all areas of flight.
I think we have several different definitions of drifting here. We don't really know how the OP has defined it. Some have taken it as meaning a lack of control or a soft response, I took it as the tendency to move in one direction in a hands-off hover.

Low cyclic gains or tight ball links will cause a lack of control resolution or inconsistent cyclic responses which could manifest themselves as hard to control drifting in any direction. Swash level issues will cause a more conventional drift in one direction when the sticks are centred.

Whichever is the OP's issue, one of our various suggestions should probably fix it.
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Old 06-29-2017, 10:55 PM   #10 (permalink)
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Default Thank you for the input guys as Always !

MY guru helping me with setup was the one hovering, I can't say really exactly how it felt. Im sure he didn't even for a half second attempt a hands off moment. Probably drifting as in, not locked in feeling. Not necessarily drifting one way or the other i gather. It is possible it could have been in the wash range. But This guys been setting up new machines for 20 years, and I bet he would have taken that into account. but again, it was late, and very dark. He didn't even want the head lights on lol. I dont know how he could really see the thing. Old school street light was barely doing anything overhead. and it was for a very short time. 20 seconds in the air maybe. I was leaning towards the tight ball links, but who knows. Either way, we will get some more packs thru it and go back through and refine the setup in the brain.

Do you guys think we should go ahead and ream out the ball links?

I know my buddy does have the tool to do so
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Old 06-30-2017, 02:07 AM   #11 (permalink)
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Exos links are tight by default. Ream them carefully and then do more trials in good conditions at daylight.
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Old 06-30-2017, 09:11 AM   #12 (permalink)
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What Mateyhv said-Ream the links and test in better conditions!
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Old 06-30-2017, 10:44 AM   #13 (permalink)
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I think this is one of those cases where "your mileage will vary". As noted, in my build thread I did not ream any links at all. My helicopter hovers and does not drift for about 10-15 seconds, but that's normal.

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Old 06-30-2017, 10:56 AM   #14 (permalink)
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hum

mixed feelings on the ball links being the culprit then?

Either way, I think we will ream and try

can't hurt right ?
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Old 06-30-2017, 11:07 AM   #15 (permalink)
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Test it in better conditions,you'll love the way it flies. It's still my favourite heli and it doesn't have any bad tendencies at all.

Isko
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Old 06-30-2017, 03:36 PM   #16 (permalink)
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Quote:
Originally Posted by joshreynolds77777 View Post
hum

mixed feelings on the ball links being the culprit then?

Either way, I think we will ream and try
can't hurt right ?
It won't hurt if you CAREFULLY ream. That means one turn of the tool, fit, and repeat if necessary. You need to avoid slop at all costs. Get some spare links before you do this so if you mess up, you'll be good.

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Old 06-30-2017, 03:49 PM   #17 (permalink)
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With all due respect Scott I have reamed tons of the newer Compass links in the last couple years. It is almost impossible to introduce any slop in those links by over reaming. In fact you may find yourself cutting new slots in your reamer after every link! Seriously though, it will definitely take more than a couple twists of the reamer to get them smooth.
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Old 06-30-2017, 03:59 PM   #18 (permalink)
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Yeah, I found those links to need a LOT of reaming to get right.
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Old 06-30-2017, 05:28 PM   #19 (permalink)
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My chronos links took quite a bit more reaming than I'm used to to get free moving. I see this as a good thing as it isn't so easy to over-ream them which ruins the link. The symptoms you are describing are right in line with tight links, but could also be low cyclic gains.
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Old 06-30-2017, 08:13 PM   #20 (permalink)
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Quote:
Originally Posted by Raz0rSh4rp View Post
With all due respect Scott I have reamed tons of the newer Compass links in the last couple years. It is almost impossible to introduce any slop in those links by over reaming. In fact you may find yourself cutting new slots in your reamer after every link! Seriously though, it will definitely take more than a couple twists of the reamer to get them smooth.
I'm just careful. It depends on the tool you use, too.

Then again, what do I know? I used to put balls in a dremel and size them by simply turning the ball in the link. That works, too. There are just so many ways to get the job done.

Scott
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Last edited by dunkonu23; 06-30-2017 at 08:27 PM..
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