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11-08-2005 01:47 PM  14 years ago
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wrbrd

rrNovice

Canada

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Tail vibration fix!
I've had nothing but trouble with vibrations in the tail assembly of my X3D and almost gave up after buying all these supposed great mods to still end up with a vibrating tail assy. After close investigation I noticed the tail rotor hub is not very precisely manufactured and that component caused all the problems.
What I did to fix this problem was I used 2 very small plastic ties secured around the hub. One tie on either side of the tail rotor shaft hole. The securing plastic nub of the ties acts as a counterbalance Now I just turn one of the the plastic ties ( marked with red pen so I know which one was adjusted) until the vibration is gone. . You might have to adjust both depending how out of wack your hub is. Also make sure it does not interfere with the grips and slider.
If anyone tries this let me know how it worked for you. It's easy and quick to dial in a smooth running tail rotor assembly with this method.
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11-08-2005 04:49 PM  14 years ago
DarkHorse1

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Gloucester UK

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top tip, thanks.
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11-08-2005 07:23 PM  14 years ago
johnny b

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Central Coast, CA

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Sounds like a top tip!

Do you have pics or a sketch of what you're talking about, since I don't quite understand where you're putting the ties and how they help with balancing the tail rotor. They're on the metal hub, on either side of the tail shaft, just before the blade grips?

I'm wondering what you're doing is similar in effect to Eric Larson's tail set-up tips, where he says to take the main rotor head off and run the model with just the tail rotor and by trial and error balance by adding tape to either tail blade and noticing the difference (good or bad, adjust as needed), until it spins true and the tail is running smooth.

Pics would really help, it sounds like a very simple idea that makes lots of sense. As a noob, what I notice about the Hornets, is there seems to be two basic camps:

1) The camp that can get the tail to work well, in which case they seem to really enjoy the model.

2) Those that have poor, vibration prone tails, and have nothing but frustration with the model.

I want to fall into camp one, sounds like most of the guys on this board of late really like this little bird. Sharing simple tips like this one helps improve a noob's chances of success dramatically. Even with my Esky FP, if I didn't read up on the net and follow other people's advice, it would still be in its box on the garage shelf, or worse, on its way to Ebay (almost did sell it at first, when I didn't know how to set it up right or fly it).
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11-08-2005 09:16 PM  14 years ago
wrbrd

rrNovice

Canada

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I tried using tape on the blades but the vibration is coming from a different direction or axes. You are correct ...the ties go on the metal hub just before the grips. You have to experiment with the positioning but once you get it right she's smooth. You might have to use a little CA to hold them in place so they won't migrate. I just had that happen today.
I'm still a noobie myself and I don't want this little bird to get the best of me. I followed Larsons suggestions as well as many others and I just couldn't get her to run smooth. I've used 3 different tail drives, different gears and arrangements, different grips and blades etc.
Sorry I have no pics but if you are still having problems let me know.
Glad to help and maybe we'll get some new insight on this problem that I'm sure many are experiencing.
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11-08-2005 11:00 PM  14 years ago
johnny b

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Central Coast, CA

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wrbrd,

Ahh, well then your suggestion is real important as another avenue to getting that tail smooth and vib-free. If you can manage pics, I'd greatly appreciate it. And, where are you finding ties small enough to fit on the rotor hub???

Great suggestion, hope it helps others. Let's end these stories about Hornets thrown across the room in frustration over set-up issues, okay?

I've seen the vid's, this thing is a great flier in the right hands, set-up right.
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11-09-2005 01:50 AM  14 years ago
Micro-Maniac

rrElite Veteran

Pasco,Washington Formerly: Captain Chaos

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I sourced a tail vibe on my H2 to the plastic gear on the output shaft having poor centering causing the output shaft to wobble and vibe with the gear.

I swapped out the bearing for one that fits on the output shaft itself like on the other side instead of on the plastic gear. You have to trim off the section of gear that would normally fit into the bearing for this.

Now even though the gear still wobbles some on the output shaft, the wobble is isolated to just the gear itself and doesn't transfer to the output shaft and out to the rotor. "The buck stops here" so to say.

The additional "meat" of the plastic gear along with the stock bearing that fits onto it does a better job gripping the output shaft, but the tail spins smoother this other way and I used some green threadlock to help the gear grip the shaft better.
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11-09-2005 07:27 AM  14 years ago
Blade-X

rrApprentice

Singapore

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Check the bearings as well. They play a vital part. LUBE LUBE LUBE. I'm on Shell Helix lube for my main shaft bearings, tail drive bearings....

Over time, with more crashes and removal of gears, both inner races and outer races of the flanged bearings will be knocked, and stressed, and that, I found contributes to sound, friction and problems.
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11-10-2005 04:23 AM  14 years ago
johnny b

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Central Coast, CA

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Captain Chaos,

Yes, I was suprised when I started jumping into tearing down my Hornets to find that conical gear flanges actually goes INTO the bearings. Seems to me a little manufacturing inconsistency in shaping those conicals could cause a bad vibe to the whole drive shaft and/or tail rotor shaft. I understand the extra plastic helps grip the shaft better since they're press-fit. I figured I'd build it as specified, then if I have any problems, one option would be using bearings that grip the shafts directly, and cut that flange part off of the conicals altogether (hoping that there was enough plastic left to help grip so they don't slip).

Blade-X,

Yup, I had a bad tail flange bearing near the tail rotor in the tail box. Bought the H2 second-hand, original owner had made lots of posts in this forum about tail troubles, spent extra on duzi tail grips, etc, then sold to me at a great price. There were problems with conical mesh on the front conicals to main gear and back conicals to each other (plus bad servo placement and unaligned CCPM, and it weighed almost 15oz AUW with wayyy too much excess weight), but that bad bearing was VISIBLY giving the tail rotor shaft a little irregularity just spinning the mains with my hand. I can only imagine what it would do at speed! So yes, watch the bearings. This particular one was making obvious bad-bearing noise. If you ever hear such a thing, check them all and pull and replace as needed.
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