Synergy Tech Support
Synergy Electric Helicopters => Synergy E5 => Topic started by: dpelletier on January 05, 2017, 01:05:53 PM
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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.
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115-316 for the bell crank. I may have an FBL one. Will check when I get home.
Cheers
Alan
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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.
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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!!
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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
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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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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.
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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.
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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... :-(
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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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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.
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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.
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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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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.
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pull on the grips while twisting feeling for any irregularities in the movement. Disconnect tail rod control linkage 1st though.
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Well, no surprise here. Matt nailed it.
I replaced the Align DS-650 with a Futaba BLS274... wag is gone!
Servos have the same specs but obviously not quite the same quality.