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HelicopterThunder TigerRAPTOR X50 › Grips uneven
12-20-2013 05:18 PM  3 years agoPost 1
don s

rrElite Veteran

Chesapeake, VA

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Assuming that the swash is level, and all head links are the same length, the grips should both give zero pitch at the same time right?

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12-20-2013 09:17 PM  3 years agoPost 2
Adam Landefeld

rrApprentice

Lehi, UT, USA

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Yes. One of the things that can mess you up though is the heading hold on the FBL controller can apply some unevenness while you are checking stuff out. So best case is to level the swashplate with the FBL in "rate" or non-heading hold mode, then check your linkages for zero pitch on both sides at the same time with the FBL still in rate mode.

Are you seeing something uneven now where you would otherwise be expecting perfect alignment of pitch on both sides?

-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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12-20-2013 09:22 PM  3 years agoPost 3
don s

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Chesapeake, VA

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My bad, she's got a flybar. I converted it over to 140 CCPM, so I was going over everything. I can't get both grips to zero at the same time with identical length links. I think the flybar carrier may not be straight. Whatever it is, it isn't obvious.

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12-20-2013 10:33 PM  3 years agoPost 4
Adam Landefeld

rrApprentice

Lehi, UT, USA

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Ahh, got it.

Can you snap a couple pictures of the head and flybar carrier with linkage attached?

Thanks,
-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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12-21-2013 02:53 AM  3 years agoPost 5
don s

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Chesapeake, VA

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I got them very close with equal links. I noticed that the flybar control arm positions are different relative to the pin in the washout on either side. See photos. I think the swash is pretty much level, but I apparently can't take a level picture.

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12-21-2013 04:40 AM  3 years agoPost 6
Adam Landefeld

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Lehi, UT, USA

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So after seeing those pics (thanks for uploading them) it appears that everything is assembled the correct way. I think the only thing it could be is that the arms on the flybar must not be perfectly level to one another, that is really the only other variable piece that you can adjust. Unless perhaps this is not a new build and has a previous crash in which case there could be bent stuff :-)

I was looking at an X50 flybar head I have here and everything matches to your assembly. Double check that your grub screws in the flybar arms aren't misaligned somehow with the flats in the flybar. If you look from the side, do the paddles and the arms all line up exactly on the same plane?

Here is the head I have here I was checking out.

Let me know what else you see.

Thanks,
-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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12-23-2013 10:13 PM  3 years agoPost 7
don s

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Chesapeake, VA

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Not a new build, but no bent parts either (can plastic parts bend?).

Maybe one of the grubs is pulling a flybar arm out of alignment when the grub bottoms out? I've flown it and there is a two turn difference in pitch links. Seems to be ok so far.

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12-24-2013 06:56 AM  3 years agoPost 8
Adam Landefeld

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Lehi, UT, USA

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Yeah that is a mystery. I would examine that flybar closely but if you are up and running with no vibrations and smooth flight I guess you aren't in any big trouble :-)

-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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12-24-2013 12:58 PM  3 years agoPost 9
don s

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Chesapeake, VA

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I should just ditch the flybar and remove all doubt.

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12-24-2013 01:46 PM  3 years agoPost 10
nappyroots2182

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Moline, il

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what were ur pitches in this picture? is one zero and the other not or are they both not zero? why im asking is that ur mixing arms dont look level with eachother.

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12-24-2013 01:50 PM  3 years agoPost 11
don s

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Chesapeake, VA

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I don't remember. One was zero, the other was not.

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12-24-2013 01:59 PM  3 years agoPost 12
nappyroots2182

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Moline, il

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is the zero grip stay zero if u spin the head around? that would show level swash to rule that out. all else i can think of IF there is no slop anywhere that maybe check for loose balls or on screwed in off center.

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12-25-2013 10:35 PM  3 years agoPost 13
Dr.Ben

rrMaster

Richmond, VA, USA

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+1

Level the swash by looking for the same pitch in a given blade viewed from all for orientations.

The observed pitch disparity is observed with more than one set of blades, right?

Is the pitch disparity linear across the entire range of throw meaning that if there is a 2 degree difference at center stick is it the same at full high or full low?

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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12-26-2013 05:25 PM  3 years agoPost 14
don s

rrElite Veteran

Chesapeake, VA

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I leveled the swash using the hex key trick. It's a 140 swash, so this is all that I know to do.

Are you recommending that I level the swash using only grip pitch as a reference?

I agree that if the pitch changes during rotation then something is off, but how would I be able to differentiate between swash not level vs. busted head parts?

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12-26-2013 06:36 PM  3 years agoPost 15
Dr.Ben

rrMaster

Richmond, VA, USA

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Just rotating the head should only expose if the swash is not level. Gotta get that straight first and then work up from there. If you want, you can temporarily hook up a pushrod straight from the swash inner ring to the blade grips in order to bypass all the see saw stuff.

Remember; the only part of the swash that defines level is the inner ring, and that alignment does not necessarily correlate with the outer ring.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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12-26-2013 06:45 PM  3 years agoPost 16
don s

rrElite Veteran

Chesapeake, VA

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I will do the bypass thing tonight. My issue is either the swash or the flybar stuff.

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12-27-2013 03:23 AM  3 years agoPost 17
don s

rrElite Veteran

Chesapeake, VA

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Any tips in general on where to start with this method? I worked with it for a while, but it reminded me of solving a Rubiks cube.

It also helps to figure out that my RC Logger gives a 0.4 degree difference just by spinning it 180 degrees.

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12-29-2013 04:11 PM  3 years agoPost 18
don s

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Chesapeake, VA

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Last night I found a flybar control arm that didn't look quite right, so I threw some metal arms on that I had in the stash. I also replaced the washout unit, simply because I had the spares. Everything looks to be square now, using the digital level on the grips.

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