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Old 02-21-2020, 07:25 PM   #1 (permalink)
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Default Tail slider binding

While building my tail I noticed the tail slider is binding. I generally expect the tail slider to be buttery smooth and fall under its own weight. When I loosen the long screw from the bracket that connects it to the carbon fiber frame, it is smooth. When I tightened it back up it binds. This is due to minor misalignment of the bracket in relation to the slider. I tried to adjust it pushed to one side or the other but it binds in both cases. Has anyone else had this problem and if so how did you overcome it?

Binding when tightened:
February 21, 2020 (0 min 19 sec)


Buttery smooth with long screw loose:
February 21, 2020 (0 min 15 sec)


Thanks,
Rick
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Old 02-21-2020, 07:51 PM   #2 (permalink)
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If the screw is snug will it still bind or does it have to be loose? I never tighten any tail area screws very tight. Only snug up and then a little nudge after that. Loctite will hold them.

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Old 02-21-2020, 07:57 PM   #3 (permalink)
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Quote:
Originally Posted by jrman83 View Post
If the screw is snug will it still bind or does it have to be loose? I never tighten any tail area screws very tight. Only snug up and then a little nudge after that. Loctite will hold them.

Sent from my SM-G955U using Tapatalk
Even snug it binds a bit. I can feel the bracket move in as I tighten the long screw. I could shim it out but I hate to.

Rick
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Old 02-21-2020, 08:03 PM   #4 (permalink)
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You know those two small screws that are in the bell crank and fit into the sliderís groove? Try backing both of them out a little. I have to do this on my Oxy helis. Otherwise I get binding at one or both extremes.
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Old 02-21-2020, 08:25 PM   #5 (permalink)
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Originally Posted by xoexoe View Post
You know those two small screws that are in the bell crank and fit into the sliderís groove? Try backing both of them out a little. I have to do this on my Oxy helis. Otherwise I get binding at one or both extremes.
This one is binding over the entire range. I added 2 shims and it does work like butter now, but I don't love it.



Rick
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Old 02-21-2020, 08:59 PM   #6 (permalink)
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I wonder if you have the tail case slightly misaligned. Have you tried loosening all the screws on the tail case and go back through slowly tightening all of them and check movement of slider?
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Old 02-21-2020, 09:23 PM   #7 (permalink)
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Originally Posted by ifheli View Post
I wonder if you have the tail case slightly misaligned. Have you tried loosening all the screws on the tail case and go back through slowly tightening all of them and check movement of slider?
To the best of my ability I believe everything to be aligned perfectly. I'm likely just a bit too fussy. I would be interested to see if others had the same issue though.

I see they used slightly larger than normal 5mm balls instead of using longer shafts on the balls to make everything line up at 90 degree angles. It's different than I am used to but I don't see any reason why it should not work fine.


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Last edited by rdlohr; 02-22-2020 at 09:45 AM..
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Old 02-21-2020, 09:29 PM   #8 (permalink)
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I had the similar issue as you with slider. I had to play with tail case. I even had to play with the screws that bolt the pitch lever arm to the mount on the tail case. ( screws through the bearings )
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Old 02-21-2020, 09:33 PM   #9 (permalink)
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Originally Posted by ifheli View Post
I had the similar issue as you with slider. I had to play with tail case. I even had to play with the screws that bolt the pitch lever arm to the mount on the tail case. ( screws through the bearings )
If you pop the links off the balls, does your slider fall under its own weight?
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Old 02-21-2020, 09:43 PM   #10 (permalink)
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Now that you mention it, I could see how shifting the carbon fiber on either side a hair up or down in the holes could change the angle of the tail shaft just enough to cause the problem I am seeing. I'll remove the shims and try that tomorrow since that also may be an indication that my tail shaft is not perfectly 90 to the tail.

I'm not really in love with this tail design. I also don't like that if I tap my tail fin on ground and fracture it I'll have have to repeat this setup rather than just replace a tail fin.

Rick
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Last edited by rdlohr; 02-22-2020 at 09:46 AM..
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Old 02-21-2020, 10:13 PM   #11 (permalink)
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Quote:
Originally Posted by ifheli View Post
I had the similar issue as you with slider. I had to play with tail case. I even had to play with the screws that bolt the pitch lever arm to the mount on the tail case. ( screws through the bearings )
That was it. The screws through the bearings allow you to twist that assembly similar to how my shim did. I shifted the top one up and the bottom one down and it's now smooth as butter. THANKS!

Of course I redid all the damn frame screws first only to realize there is no slop there at all so that won't change the alignment of the tail shaft at all I'm happy to report.

Rick
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Old 02-22-2020, 02:20 AM   #12 (permalink)
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So Rick is this a machining tolerance/quality issue or something else? Seems there is room for this assembly to move and put it "out of whack" As ifheli had the same issue are others having this issue as well?
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Old 02-22-2020, 06:08 AM   #13 (permalink)
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I am having the same issue with mine. Iíll try your trick to see if it works.
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Old 02-22-2020, 06:51 AM   #14 (permalink)
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Quote:
Originally Posted by blarks View Post
So Rick is this a machining tolerance/quality issue or something else? Seems there is room for this assembly to move and put it "out of whack" As ifheli had the same issue are others having this issue as well?
I think it is OK. I just didn't realize when putting in these two screws that they had the ability to bind the slider. Now that we know, it's just a matter of adjusting them correctly. I'll note it in my manual and build thread.

Rick
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Old 02-22-2020, 07:18 AM   #15 (permalink)
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Originally Posted by ArmchairNinja View Post
I am having the same issue with mine. Iíll try your trick to see if it works.
Pop the links off then just adjust it till its smooth as butter. The slider should fall under its own weight. Mine does now even with everything fully tightened. Ideally, it would do that with the links on, but until they loosen up a bit they will bind on a new assembly. Mine are getting better already just from exercising them.

Rick
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Old 02-22-2020, 07:25 AM   #16 (permalink)
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After going thru it all mine is really smooth and free. I`m not a big fan of the tail design on the OXY line of helis.

Good to hear it helped you.




Quote:
Originally Posted by rdlohr View Post
That was it. The screws through the bearings allow you to twist that assembly similar to how my shim did. I shifted the top one up and the bottom one down and it's now smooth as butter. THANKS!

Of course I redid all the damn frame screws first only to realize there is no slop there at all so that won't change the alignment of the tail shaft at all I'm happy to report.

Rick
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Old 02-22-2020, 07:47 AM   #17 (permalink)
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I would not call it a quality issue. It is more likely just a machining tolerance issue which happens in machining of parts for anything. The tolerance issue may also be do to the bolts that are used and not the machining of the parts by Lynx/Oxy. My tail case assembly w/ kit supplied bolts had enough tolerance build up that it could be out of wack enough to make the slider stick. After making sure my tail case was square and adjusting the mount and pitch lever arm it became butter smooth.

As for the bolts I have had some that are the diameter they should be. Then I have had some that are smaller in diameter than they should be.

When I would build a G380/420 I always assemble tailcase off the heli and squared it up on a perfectly flat surface. I did not do this for the OXY5 build but it does look like it could be done the same way. Then mount it on the boom.


Quote:
Originally Posted by blarks View Post
So Rick is this a machining tolerance/quality issue or something else? Seems there is room for this assembly to move and put it "out of whack" As ifheli had the same issue are others having this issue as well?
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Old 02-22-2020, 09:42 AM   #18 (permalink)
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This fix shall be known hence forward as the ifheli slider adjustment!

Rick
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Old 02-22-2020, 03:44 PM   #19 (permalink)
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I was able to correct my tail alignment as well. I had to loosen all the screws and then tighten while twisting the tail box slightly to the left. Now itís much better, so I finished the setup and testing and put the blades on. Itqís supposed to be nice out tomorrow so Iím hoping to maiden her.
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Old 02-22-2020, 06:15 PM   #20 (permalink)
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Quote:
Originally Posted by ArmchairNinja View Post
I was able to correct my tail alignment as well. I had to loosen all the screws and then tighten while twisting the tail box slightly to the left. Now it’s much better, so I finished the setup and testing and put the blades on. Itq’s supposed to be nice out tomorrow so I’m hoping to maiden her.
Interesting. So just twisting the hinge for the slider bracket didn't do it for you. You said much better. Does that mean there is still a little binding? (Looking sharp, by the way!)

Rick
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