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HomeAircraftHelicopterSynergy R/COther › Synergy tail "sticky"
03-03-2008 04:03 PM  10 years agoPost 1
GScott

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Lewis Center, OH

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I'm trying to track down a bad tail wag. I just built my new Synergy with the Spartan/8900 combo and the tail wags bad in a hover. I'm using a 9303 w/ the gyro menu and started with a gain of 75%. I tried dropping as low as 65% and as high as 85% and the wag never went away (for those not familiar with a 9303 51%-100% is heading hold and 0%-50% is rate mode). The tail is a little sticky due to the links on the tail grips. I have sized them at least 10 turns with a Hypersizer and they are still tight and make the movement sticky. Bear in mind I'm testing just the tail grip links with nothing else attached. Everything is smooth until I attach the tail grips to the pitch slider. Will replacing the grips with the Kasama grips make the tail smoother. I'm afraid to remove any more material with the Hypersizer but the tail is so tight I'm afraid it's causing the wag.

I also noticed the the plastic sleeves on the carbon tail rod were causing a little drag. Are they necessary?

If it matters I'm running the linkage ball at 16.5mm per the manual.

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03-03-2008 04:53 PM  10 years agoPost 2
Carl Bonta

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Elgin, IL USA

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Thrust Bearing issue? Sounds like that is your problem.

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03-03-2008 04:59 PM  10 years agoPost 3
GScott

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Lewis Center, OH

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Thanks Carl. I'll pull the tail apart tonight and double check it.

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03-03-2008 05:01 PM  10 years agoPost 4
MarshallB

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Middle Arkansas

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From what I've experienced on the Synergy, you really have to work out all the areas that induce drag. If the link moves freely on the tail hub then it is somewhere else. You have to test each component separately. If you have to, open the hole on the tail rod guide so it does not cause any drag. Use pliers if you have to,by squeezing the link on the ball to loosen it up. Just don't over do it. The setup needs to be really smooth front to rear. Grab each tail grip pulling outward some and twisting. See if it moves freely. This might reveal something in the thrust bearing as Carl says. This system seems to have a bit more drag than other systems but tends to get better the more it is used.

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03-03-2008 06:35 PM  10 years agoPost 5
Long Nguyen

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SoCal, US

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On my Synergy I have a little bit of drag on the tail linkage system however I got no problem with it. I got the same set up with the Spartan + 8900G.

Here are my gyro settings if you want to know: gain in ATV menu is +45% for head locking mode, servo arm is 16mm, Deceleration is 80%. My tail works flawlessly.

I agree with Carl. You should check for the bearings. And try to work out all the drag as much as possible as Marshall said.

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!

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03-03-2008 06:49 PM  10 years agoPost 6
GScott

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Lewis Center, OH

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Thanks. Is the plastic sleave on the carbon rod necessary? Anyone run with it?

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03-03-2008 06:52 PM  10 years agoPost 7
Long Nguyen

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SoCal, US

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Yes, they are necessary because without them, the carbon rod will be ground down by the guides after a few flights.

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!

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03-03-2008 07:41 PM  10 years agoPost 8
loewermx

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Alexandria, La

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Is there any side to side play in the tail grip? One machine that I built had no play at all and when it was in a hover it had a wag. Not even the 611 could control it. After a good conversation with Todd at Synergy RC, we figured out that with the pressure on the tail grips would almost lock up on the hub. The solution was to actually grind the OD of the outside plate of the thrust bearing allowing the grip to have some side to side play.

Anymore questions, just ask as I will try to explain myself better.

Cajun Aircraft

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03-03-2008 08:57 PM  10 years agoPost 9
creightoncarr

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Missouri City, Texas - USA

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I've seen a number of people not using the shrink tube on the carbon tail pushrod and I personally haven't seen the pushrod wearingas a result. You definitely need the plastic insert in the metal boomclamp - I would imagine without it the rod might wear down. I noticed on the 9's running without shrink tube that pushrod does vibrate against the guides at idle and is a little noisy.

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03-03-2008 09:18 PM  10 years agoPost 10
Bart B

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chicago illinois

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I flew my heli without the shrink tubing for about 20 flights.It deffinately wore down the carbon rod.You can get by without but make sure you install sooner than later.
I break down the whole tail and address each part.Bearings in grips,the 3mm cap screw(tighten with pinch grip force only),size pitch links,tail pins,slider bushing,rod links.
Carl showed me this at a funfly.Well worth the time to get it silky.

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03-03-2008 09:22 PM  10 years agoPost 11
airboss

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OC ,california

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you must use the shrink tubing on the pushrod! if you squeeze the ballink with a plyer while sizing it. the pushrods and links will move freely.

Urukay HPS3 KSE 700 HPS3

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03-04-2008 04:13 AM  10 years agoPost 12
wings19

rrKey Veteran

Tucson, AZ

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Yeah my tail rod links are tight as well... All my links are tight even after sizing. I really hate how Synergy made all the links so tight!

Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter

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03-04-2008 04:30 AM  10 years agoPost 13
GScott

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Lewis Center, OH

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I took the tail apart and checked the thrust bearings. Both were installed correctly and I pulled on both grips and rotated them and they were both smooth. I disconnected everything and started at the servo and worked back. Everything was smooth until I got to the tail grips. As soon as I snapped the tail grips onto the pitch slider I noticed the sticky tail. At this point I'm not sure what to do. I don't know if the sticky grips are causing the tail wag or if it's something else. I wish Synergy would get off their butts and release the SE tail system that doesn't use the same linkage ball setup on the tail grips.

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03-04-2008 04:44 AM  10 years agoPost 14
airboss

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OC ,california

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size those links on the tail pitch slider,use the plyer to get good fit.

Urukay HPS3 KSE 700 HPS3

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03-04-2008 12:06 PM  10 years agoPost 15
Chuckie

rrKey Veteran

Crofton Maryland

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More comments if you're haven't found the cause.
All my links are tight even after sizing.
Then you’re not done. Keep using the hypersizer and make them bigger, squeezing the links as others have said might help as well. The links will always be tight to get on and off but once in place they should be very smooth with no play. I'd rather have the links this way versus ones that pop off in flight.
As soon as I snapped the tail grips onto the pitch slider I noticed the sticky tail. At this point I'm not sure what to do. I don't know if the sticky grips are causing the tail wag or if it's something else.
If you pop on one grip into the link, where the hub is off the tail output shaft or the slider assembly is off the shaft, the link if sized correctly should be smooth. Check the other grip so you know when tested individually that both links are sized correctly and are smooth. Now if you reinstall the slider assembly and hub and pop on one link, is it smooth? Now do the second link, is it still smooth? If the slider is not smooth when both links are installed then you have something unusual/wrong.

Can you take a close up picture of the complete tail (slider, hub, and grips) so we can see how it looks?

I have never found the rod to drag when using the heat shrink tubing if it's lightly heated.

Charles

Please stand by for faster service!

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