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Home✈️Aircraft🚁Helicoptere-AlignOther › Flybar Seesaw Bushings/Bearings Mod
09-05-2006 08:51 PM  14 years ago
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caseyjholmes

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Portland, Oregon

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Flybar Seesaw Bushings/Bearings Mod
So I hear Align is making a ball bearing flybar seesaw. Is this correct?
Anyone have one yet? I am doing a rebuild on my every day flyer SE and noticed there is bit of wiggle that I can't remove in the bushings of the flybar seesaw. Can't I just find a bearing and replace the bushing?
My SE gets to do alot of flying, so I do a weekly checkup to make sure everything is in tip top shape. I am finally noticing the wear in the bushings of the seesaw.
Thanks for the help
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09-05-2006 09:04 PM  14 years ago
caseyjholmes

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Portland, Oregon

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For example,
The only non bearing supported place in the entire align rotor head is here..

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09-05-2006 09:09 PM  14 years ago
Rennster

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Hawaii

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I've seen in on Grandrc.com but they don't have it in stock yet. I have the plastic one and I can't make it loose enough without introducing any play. My flybar is tight so that you have to move it with your hand; it won't teeter on its own.
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09-05-2006 09:13 PM  14 years ago
caseyjholmes

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On the SE, they were ok at first, but now 200 (or more) flights in, and I notice some wiggle for sure. You can crank the screws down with loctite on the SE and still get a smooth teeter though. But after many flights it wears down and I am starting to notice the play in the flybar now. This has to effect stability in one way or another..
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09-05-2006 09:34 PM  14 years ago
caseyjholmes

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Portland, Oregon

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Here's a fix..
Use a bearing from one of the mixing levers (I had extras) and drill out the seesaw after removeing the bushing. You WILL need washers on both sides of the bearing when you re install it. And now you can use some of those nice allen cap head screws.

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09-05-2006 09:40 PM  14 years ago
caseyjholmes

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Portland, Oregon

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4 ball bearings.
I will now try this on My SE gimbal..

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09-05-2006 09:48 PM  14 years ago
kingair

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Utah - USA

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My bushings wore out and I replaced them with bushings I pushed out of a plastic seesaw. I oil them every couple of flights with triflow and they are holding up great. On the original bushings, the ones that wore out, I never oiled them. When I took the head apart to replace the bushings the inside of the mixing arms were "yellow" with bushing material. Now, after many flights I can't see any bushing material coming off and I can't feel any play at all in the bushings. I do however plan on buying the new seesaw with the bearings as soon as I find one because of the warm fuzzy factor I'm sure I'll get from the upgraded part.

Here's a picture of how worn out the original bushing was when I changed it out.

There is a very fine line between "hobby" and "mental illness."
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09-05-2006 10:34 PM  14 years ago
caseyjholmes

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Portland, Oregon

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Ok, Check it out. Made my own ball bearing flybar seesaw..
Should work.. I'd think. It's on my daily flyer, so I'll know how it does soon.


Oh, and the good news..
It clears the mixing arms easily..

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09-05-2006 10:39 PM  14 years ago
Rennster

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Hawaii

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That's awesome. Thanks for sharing your idea. I will try that!
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09-05-2006 10:40 PM  14 years ago
caseyjholmes

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Portland, Oregon

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OMG! the flybar has NO WIGGLE! Neato!
USe those screws that are ment for ball links to screw in the front of the bearing, and put a washer on the back. You know, those countersink screws, so it makes a firm seat on the front of the bearing inner race sleeve without a washer (to keep it from hitting the flybar seesaw mixers).
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09-05-2006 10:51 PM  14 years ago
caseyjholmes

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Portland, Oregon

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And here it is installed..

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09-05-2006 10:52 PM  14 years ago
caseyjholmes

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Portland, Oregon

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The bearings pop out the side of the flybar teeter now a tiny bit, but wont hit the mixers and the teeter is now bearing supported, and very smooth. Not a drop of wiggle left to right if you hold the rotor head and the flybar while trying to wiggle them. It's safe to say this will work perfectly. I Can't see any reason it would fail.

Off to the dentist
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09-06-2006 01:05 AM  14 years ago
caseyjholmes

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Portland, Oregon

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Flew two batts on the way home. Got footage to upload in a minute.
My ball bearing seesaw mod works great =)
I would advise this mod for anyone who doesn't like the flybar BUSHINGS and wants nice smooth BEARINGS
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09-06-2006 01:48 AM  14 years ago
caseyjholmes

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Portland, Oregon

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ok, found a dirt road on the way home and flew with the ball bearings in the gimble. I had nobody to film it for me, so I kept it short, and it feels like you are going offroading with me at first
Enjoy the footage.. it's the best I could do today..
http://www.youtube.com/watch?v=-rx0taiWWk0
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09-06-2006 02:58 AM  14 years ago
caseyjholmes

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Portland, Oregon

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Video link works now =)
The winds were like 20mph and I had nobody to film for me, so it's very short, but proves the bearing mod worked.
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09-06-2006 04:50 AM  14 years ago
Rennster

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Hawaii

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Just did the mod. It was simple and works. Very smooth and tight.
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09-06-2006 05:19 PM  14 years ago
caseyjholmes

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Portland, Oregon

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I found the best way to install the washers beneath the bearing was to put the flybar gimble on the rotorhead first, with no bearings in it, then apply the screw/bearing/washer assembly and screw them straight through the seesaw gimble into the rotor head. The whole assembly loosened up after the first flight, and now it is really free of play and running smooth as butter. I will update when I have a good 25-30 flights on it, to see if I notice any play or problems.
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09-06-2006 06:06 PM  14 years ago
str8den

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NE U.K

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you say you're using 4 bearings in your mod., could you not put the 'washer' between the bearings like as fitted in the mixer arms etc, and still have correct clearance?
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09-06-2006 06:14 PM  14 years ago
caseyjholmes

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Portland, Oregon

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There is only one bearing in each side of the flybar gimble replacing the oilite bushing. The washer is to prevent the bearing from rubbing on the head. The outside of the bearing doesn't need a washer, because of the countersunk type screw I used.

I said 4 bearings because now the entire gimbal uses 4 bearings, instead of two (two for the flybar axis, and two for the teeter axis, one in each slot where the bushing used to go.)
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09-06-2006 06:19 PM  14 years ago
str8den

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NE U.K

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right your are, thanks. look forward to see how its holding-up after a few flights - great mod. too by the way!
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