Slight wag on my E5 in a hover...

[dpelletier]

I have a slight wag on my E5 in a hover.  FBL is CGY750
I'm assuming the slight slop shown in the video is the cause.
https://youtu.be/VCotBmGdOs4

I ordered the new slider, 200-411, but I think I might need to replace the Tail Bell Crank as well.
Does anybody know the part number for the Tail Bell crank, its not listed in the manual?

I looked at getting FBL Rotors aluminium version but he is out of stock.

[alan]

115-316 for the bell crank. I may have an FBL one. Will check when I get home.
Cheers
Alan


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[curmudgeon]

That "slop" is within normal limits.  A new tail slider and/or bell crank will not make a difference.  Look for another source to explain the tail wag. 

[dpelletier]

115-316 for the bell crank. I may have an FBL one. Will check when I get home.
Cheers
Alan

Awesome Alan, thanks.  BTW I was just getting ready to order Fusuno canopies of your Raygen design... still my favorite look, so visible no matter what sky!!

[dpelletier]

That "slop" is within normal limits.  A new tail slider and/or bell crank will not make a difference.  Look for another source to explain the tail wag.

Really??  Are you sure?
I don't have any slop at all in my old Furion 6.
The tail performs well in my usual, sports style, flying. Just a slight occasional wag in a hover.

You're probably right, but seeing as I already received the new slider so I'll install it and see if it makes any difference.

Thanks for your input

[alan]

Be sure you size the tail pitch links.  That has been something I see that frequently causes a tail wag.
Alan


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[dpelletier]

Be sure you size the tail pitch links.  That has been something I see that frequently causes a tail wag.
Alan

Will do, thanks Alan.

[Mike Spano]

alan is correct, if they are new links, not sizing them properly will cause this. if they are not new though and you have been flying it a while like this and you didn't have a wag, then your servo may be having issues.

all synergys have that slop there. it doesn't affect performance.

[dpelletier]

I did not have that wag before with the FBL unit I had before  the Futaba CGY750.
However... on the first CGY750 flight the helicopter crashed at takeoff (wrong compensation direction).
So I must have some vibration issue even though I replaced all damaged parts.

Maybe I'll switch to yet another FBL unit that can help me with vibration analysis...  :-(

[alan]

Did not have a FBL rotors bell crank. Check ALL shafts from head to tail.
Let us know what you end up finding.

Cheers
Alan


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[dpelletier]

Thanks Alan I will do that.

Also, @curmudgeon, it appears that you are correct in your assement, after speaking with many pilots much more experienced than myself in problem diagnostics, such as yourself obviously, it appear that the slop I find is most likely not the cause for my slow wag.

I will do as Alan suggests and check all shafts to see if I can isolate the problem.
Thank you all for your suggestions.

[awesomeOne]

I have a similar wag at low head speed on my e6 with CGY750 and I don't have tail slop. It's oy at low headspeed so I just ignore it.

[Matt Botos]

I see this all the time, the cause is usually tight linkage, thrust bearings, or servo performance. What servo are you using for the tail?


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[dpelletier]

I see this all the time, the cause is usually tight linkage, thrust bearings, or servo performance. What servo are you using for the tail?

Hi Matt,
I am currently using the Align DS-650 servo on the tail.
As for the linkages being tight, I did run your sizer tool through all of them and they do seem pretty good to me but I might have a little conservative for fear of overdoing it.
For the thrust bearing, you are speaking of the tail grips... maybe I should just change those out, is there a way to check them?
Thanks for your input Matt, very much appreciated.

[Gabriel Sandoval]

pull on the grips while twisting feeling for any irregularities in the movement. Disconnect tail rod control linkage 1st though.