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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › blade tracking problem with rjx flybarless fl700 head-? because of bearing damage?
05-19-2018 07:57 PM  28 months ago
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motorrc

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blade tracking problem with rjx flybarless fl700 head-? because of bearing damage?
My raptor 90 was flying great before I had an unscheduled landing. The spindle (feathering shaft) and blades were damaged and I replaced them. The bearings in the grips did not seem as smooth as new but I couldn't figure out how to replace them and didn't think they were a major problem. Now I can't get the blades to track properly. The hub and grips look ok but I don't know how to check them other than by looking. If the bearings are the most likely issue, any tips on how to get them out. They came installed in the grips when I received them.
if it doesn't fit, make it fit but don't force it.
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05-19-2018 08:05 PM  28 months ago
InvertedDude

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motorrc
I had the same problem with metal grips. Heat from a heat gun, you will have to replace the dampeners.

Use a small punch tool and lightly tap around the inside edges of the bearings with the closest ones to the grip blade bolt.
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05-19-2018 08:09 PM  28 months ago
motorrc

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why would I have to replace the dampers since the dampers are in the hub and the bearings are in the grips?if it doesn't fit, make it fit but don't force it.
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05-19-2018 08:10 PM  28 months ago
InvertedDude

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motorrc
I forgot! LoL!!!

Dampeners on Raptor 90 is in the center hub. Sorry!
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05-19-2018 08:11 PM  28 months ago
JuanRodriguez

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You wouldn’t.... I think he misspoke....

Edit: and he's using the RJX FBL head, not the TT OEM....
Been there, done that and old enough to know better.....
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05-19-2018 08:22 PM  28 months ago
JuanRodriguez

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Also, I would look for something bent as the issue to your tracking issues....

Either the "new" feathering shaft is not straight (did you check it before installing ?)

Or perhaps one of the arms that attaches to your blade grip may be tweaked a little as a result of the crash....

Or perhaps the screw that the ball goes through into that arm may be tweaked for the same reasons......
Been there, done that and old enough to know better.....
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05-19-2018 10:27 PM  28 months ago
motorrc

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yes, I'm using the RJX fbl head. Thanks inverted dude for the tip using the heat gun-worked well. I have the new bearings in and feels like new. I did check the new spindle and it was straight. Now the question I have is could damaged bearings cause poor tracking or do I need to look further for a cause. Jaun, the grip arms and balls appear straight.if it doesn't fit, make it fit but don't force it.
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05-19-2018 10:53 PM  28 months ago
InvertedDude

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Motorrc
Are u using the same ball links and balls from last crash....something is streached.
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05-19-2018 11:01 PM  28 months ago
Pistol Pete

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motorrc the grip arms and balls appear straight.
The eye-O-meter can be deceiving.

An easy way to check (if you dont own a laser level) is to measure distance from top of boom to blade tip. (Trailing edge is best)

Extend blades and set to zero pitch. (Of course, power servos)

Measure one blade, ROTATE head 180° and measure other blade distance from boom.

You should get same measurement. Otherwise something is bent or links are not equal.

To verify if its the links, swap them to see is measurement difference follows the link, if not, its the grip arm or something else as mentioned.
~~Enjoying the hobby one flight at a time~~
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05-20-2018 01:29 AM  28 months ago
JuanRodriguez

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motorrc Jaun, the grip arms and balls appear straight.
“Appears to be” is not good enough.... niminally, unscrew the ball links to check for any “wobble” in the screw/ball as you unscrew them .... that’s the only way to tell..... not sure how to best check the grip arms themselves......
Been there, done that and old enough to know better.....
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05-20-2018 03:14 AM  28 months ago
grimthenoble

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Bearings: either are good or junk.. stick your finger in the id and spin them, if there is any bit of roughness throw them out. you will never be able to just throw stuff back together and everything track perfect. disassemble entire head and inspect everything, needs to go back together as it did from new.Never go Full Retard!
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05-20-2018 02:31 PM  28 months ago
motorrc

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ok, thanks for the help folks.if it doesn't fit, make it fit but don't force it.
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05-20-2018 03:22 PM  28 months ago
Heli Fanatix

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Have we closely examine the main bales grip arms?
- those may bend during a dirt nap
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05-20-2018 03:31 PM  28 months ago
motorrc

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arms "look" ok but I'm planning on using Pete's technique to screen for any bent parts. Probably won't be able to get to it for several days.if it doesn't fit, make it fit but don't force it.
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05-20-2018 06:11 PM  28 months ago
Jeff polisena

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westpalmbeachflorida usa

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Look at thrust bearings if they are not smooth and are pitted that could be the problem .I stole it ,flew it and gave it back ;)
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06-04-2018 09:34 PM  28 months ago
motorrc

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Just a follow up. Did Pete's screen for bent parts. Was off by 3mm. Replaced one of the blade grips. The arm on one of the grips had a very subtle irregularity in the chrome finish, this is how I chose which grip and arm to replace. I would never have noticed this without careful examination. Now the measurement above the boom is perfect. Its too windy to do a maiden flight today, will give a report on the maiden in the near future.if it doesn't fit, make it fit but don't force it.
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06-06-2018 11:54 PM  28 months ago
motorrc

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follow up
Flew the 90 today, tracking was perfect right off the bench. Thanks for the help folks. I was surprised that the blade grip was bad, it looked perfect. Anyway, on my temperature telemetry, the sensor is 2 fins down from the head and the temp was as high as 215F. What should the temp be?
if it doesn't fit, make it fit but don't force it.
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06-07-2018 12:15 AM  28 months ago
JuanRodriguez

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JuanRodriguez Or perhaps one of the arms that attaches to your blade grip may be tweaked a little as a result of the crash...
That was from post # 6.

If you can buy the arms to replace the one that’s “tweaked” , you’ll be able to salvage the grip and have it as a spare ....for the next time !

Glad I was able to help ....
Been there, done that and old enough to know better.....
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06-07-2018 12:29 AM  28 months ago
motorrc

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I took the grip arm that I thought was tweaked and laid it on a granite table top that I know is flat and there was no evidence that the arm was damaged. I now think that irregularity that was on the arm was a slight plating defect. I think the blade grip was the culprit, however, when I replaced the grip I also replaced the arm on the same side so I can't say for sure. I guess I could put the original arm back on and see what happens.if it doesn't fit, make it fit but don't force it.
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06-07-2018 01:33 AM  28 months ago
JuanRodriguez

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If it's flying right and problem sorted, I wouldn't take the time to mess with it....

As an aside, where are you getting parts for the RJX head ??
Been there, done that and old enough to know better.....
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