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Old 01-25-2021, 03:38 AM   #41 (permalink)
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Originally Posted by flipboy View Post
When i first got my Oxy4Max,the person i bought it from had the ball on the tail servo arm on the second hole and he also snipped the end off of it.Initially i was having a slight wag problem during a hover and when i would do elevator tic toc's and hard
"Pop and Lock" stops.
I replaced that two hole servo arm with a three hole servo arm and installed it on the third hole and redid my endpoints,now i don't have any wags or blow outs.But by installing it on the third hole,my mechanical gain was too high and i had to decrease my tail gain down to 24 from 35.
This has improved it to the point itís almost gone, but I still got a bit maybe 1/2 inch either side.
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Old 01-25-2021, 05:28 AM   #42 (permalink)
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Nearly every mfg out there calls for those bearings to be put in with green loctite. May not be the case for something exceptionally small. It is what it is. Either they do or you do.
Thats bad news for me. I've not green loctited any of them.
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Old 01-25-2021, 06:28 AM   #43 (permalink)
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Thats bad news for me. I've not green loctited any of them.
Truth be told, I don't use the green stuff either for this, but it is usually clearly stated in most manuals. The red loctitie seems to work fine for me.

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Old 01-25-2021, 08:05 AM   #44 (permalink)
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I have not loctited the bearings in at all. The inside bearing is usually already green loctited from the factory (at least on the ones I've built). The outside one I just put in there - no loctite So ... how bad is that?
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Old 01-25-2021, 09:01 AM   #45 (permalink)
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I don't loctite any bearings.
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Old 01-25-2021, 09:05 AM   #46 (permalink)
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So ... how bad is that?
Not sure what the ramifications are. I guess it comes down to how much you like it all falling out if you have to remove the grips for any reason.
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Old 01-25-2021, 09:25 AM   #47 (permalink)
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So ... how bad is that?
Not sure what the ramifications are. I guess it comes down to how much you like it all falling out if you have to remove the grips for any reason.
The first purpose of the (green) retaining compound is to prevent the bearings from rotating at the interface to the grips. This can be seen at the (steel) shafts at the inner races sometimes. It protects the softer aluminum from being damaged if the bearing skids. The second purpose is to take up the gap between the bearing and the hole it fits into. Most of the time the bearings we have are not press fit but have a fair amount of clearance. This is done for cost and ease of assembly. So it’s cheaper and easier to just add a dab of green stuff...

What we really need is something like purple loctite, but for a bearing retaining compound. A light duty, easy to disassemble bearing retaining compound.
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Old 01-25-2021, 10:33 AM   #48 (permalink)
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That doesn't really say what issues there are if you don't. Obviously if people can get away with it and not see any problems, one could ask why do it? Probably several things that "could" happen but if nothing ever does... I tend to fo it because the manual calls for it.
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Old 01-25-2021, 10:42 AM   #49 (permalink)
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This has improved it to the point it’s almost gone, but I still got a bit maybe 1/2 inch either side.
Oh,i almost forgot to add that i also reversed the tail rod holder on the boom.You simply unscrew by a half turn and than you install it on the other side of the boom.The reason i did that was initially the rod had a slight bend to it due to the position of the rod holder,now the rod is perfectly straight down the boom and there isn't any bow/bend for it to affect the performance of the tail system,but you have to install a three hole servo arm to get the tail rod straight.I like my tail rod to be "Perfectly" straight,i don't know why Lynx pre-installs them that way.
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Old 01-25-2021, 11:29 AM   #50 (permalink)
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That doesn't really say what issues there are if you don't. Obviously if people can get away with it and not see any problems, one could ask why do it? Probably several things that "could" happen but if nothing ever does... I tend to fo it because the manual calls for it.
Of course, it’s like a lot of things. You can drive down the road with only 2 lug nuts too or under/over inflated tires. (I jest)

It’s best practices vs. what you can get away with. On Gaui Helis, they don’t specify what to use where for retaining compound, but I recently saw an issue where someone’s tail was making noise because they did not apply green to the tail bell crank bearings. It didn’t show up right away but after a while, presumably after it worked itself loose.
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Old 01-25-2021, 11:56 AM   #51 (permalink)
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I tend to fo it because the manual calls for it.
I totally didn't catch that the manual calls for it. The part where it shows you green loctiting the bearings in is on the page before it shows you putting the thrust bearings in.

now i'm wondering what i'm thinking as it looks like the bearings both go in before the thrust bearing. It says it was ready to use so they likely are green loctited in there on mine. Referencing the oxy 5 head since that is the last one i built.





Looks like the tail is different.



Apologies. I've only built two helis so far: oxy4 max and oxy5 meg.
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Old 01-25-2021, 01:13 PM   #52 (permalink)
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Oh,i almost forgot to add that i also reversed the tail rod holder on the boom.You simply unscrew by a half turn and than you install it on the other side of the boom.The reason i did that was initially the rod had a slight bend to it due to the position of the rod holder,now the rod is perfectly straight down the boom and there isn't any bow/bend for it to affect the performance of the tail system,but you have to install a three hole servo arm to get the tail rod straight.I like my tail rod to be "Perfectly" straight,i don't know why Lynx pre-installs them that way.
Almost every heli I have built the rod is left bent. Luca has said it is designed that way to reduce vibrations induced through the rod.
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Old 01-25-2021, 01:20 PM   #53 (permalink)
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It’s best practices vs. what you can get away with.
Only thing I have applied any of the green stuff to is my Oxy 2 pinion. Although using red is not using nothing, it definitely is not the same as green and only lightly holds the bearings. Which goes to prove in this area you likely can get away with a lot, from using what I use to using nothing.

The truth about that stuff is it is not very user friendly and if you don't watch what you're doing that bearing you sought to keep in place may easily get locked up in the process. The red stuff would never do that.
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Old 01-25-2021, 01:23 PM   #54 (permalink)
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I totally didn't catch that the manual calls for it. The part where it shows you green loctiting the bearings in is on the page before it shows you putting the thrust bearings in.

now i'm wondering what i'm thinking as it looks like the bearings both go in before the thrust bearing. It says it was ready to use so they likely are green loctited in there on mine. Referencing the oxy 5 head since that is the last one i built.
Apologies. I've only built two helis so far: oxy4 max and oxy5 meg.
Lynx always takes care of that part for you, as do many other mfgs. And you will tell it is there the minute you try to get one out.
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Old 01-25-2021, 01:41 PM   #55 (permalink)
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Almost every heli I have built the rod is left bent. Luca has said it is designed that way to reduce vibrations induced through the rod.
I see,well from my personal experience my tail wags have not been a problem since i made the switch.I've flown it this way for at least 50 flights now,but if i ever encounter a tail problem again i will most certainly think about reverting back to the bent configuration.
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Old 01-25-2021, 04:34 PM   #56 (permalink)
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Originally Posted by fiddle View Post
I totally didn't catch that the manual calls for it. The part where it shows you green loctiting the bearings in is on the page before it shows you putting the thrust bearings in.

now i'm wondering what i'm thinking as it looks like the bearings both go in before the thrust bearing. It says it was ready to use so they likely are green loctited in there on mine. Referencing the oxy 5 head since that is the last one i built.





Looks like the tail is different.



Apologies. I've only built two helis so far: oxy4 max and oxy5 meg.
Gee you almost had me thinking the main grips were built wrong at the factory. I must admit I have not seen this setup in main grips before, always the thrust sits on the outside.

Iím now wondering what else to try in order to eliminate this wag entirely.
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Old 01-25-2021, 05:13 PM   #57 (permalink)
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Simo71,

What is the pirouette consistency set at?
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Old 01-25-2021, 05:49 PM   #58 (permalink)
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Simo71,

What is the pirouette consistency set at?
Rudder delay 5 pirouette cons 170.

Down to 34% gain.
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Old 01-25-2021, 06:31 PM   #59 (permalink)
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I would try dropping the rudder delay down to 2.


I`m at 2 on rudder delay, 180 on piro con. and have gain at 50-52 using a KST MS565. The ball on servo arm is 10.5mm. I did not used the supplied servo arm. I use an arm supplied with the servo. I thought my end-points were at about 116-118 but they are at 104 and 105 rudder end-point.



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Rudder delay 5 pirouette cons 170.

Down to 34% gain.
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Last edited by ifheli; 01-25-2021 at 06:43 PM..
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Old 01-25-2021, 08:47 PM   #60 (permalink)
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Makes me think it could be a mechanical issue that results only once the centrifugal forces are at work.
Have you tried operating the pushrod by hand while spooled up?
I'll do this by removing main blades and securing the tail of the heli between some cinder blocks or something.
You can do it without tail blades too, but of course it won't simulate the same degree of force.

Another thought......If you want to see if your servo is strong enough, you could increase it's leverage buy moving the ball in on the horn (just as a test), increase the gain and do a test hover.

Chris
This! When trying to push or pull the push rod it’s rather difficult to move. Tail blades are attached. Without doing this it falls under own weight when heli is layed on its side.

I’ve removed thrust bearings on tail and regreased them, with no improvement.

Last edited by Simo71; 01-26-2021 at 02:42 AM..
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