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HelicopterBlades and Night Flying › Tail blades go bad causing vibration
12-19-2011 03:08 AM  5 years agoPost 1
Sam2b

rrElite Veteran

Seattle, WA

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Has anyone experienced tail blades going bad by themselves without impact or damage?

Watch at YouTube

Has anyone not crashed a heli since a new set of tail blades, and then after many flights discover a terrible vibration from the tail section? Take my word for it - these tail blades look flawless without a ding, and since the initial installation they balanced perfect on a magnetic balancer (while installed on the fully assembled tail assembly). But now when I balance them one blade is severely off balance.

I discovered a massive vibration issue with my tail assembly while spinning full RPM, no main blades, only tail blades installed. When I remove the tail blades there are no vibes. It is as if something inside one of the tail blades has shifted (?). I replaced the current tail blades with another pair balancing 98% perfectly on the magnetic prop balancer, and when installed them on my heli and spooled up it was no surprised the vibrations were gone and now very smooth as I gripped my hand on the boom.

Isn't that so strange how tail blades can virtually "go bad"? I will now pursue a free replacement because the "bad" blades look flawless yet show a severe imbalance on the magnetic balancer for no reason at all. I even have an extra long tail fin to ensure I cannot touch these blades on the ground.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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12-19-2011 03:14 AM  5 years agoPost 2
hornet dave

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Cedar Rapids, IA USA

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Could be as simple as the tail blade bolts are too tight. Ive done that a couple times myself.

I got a fever! The only prescription is MORE 6HV

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12-19-2011 03:17 AM  5 years agoPost 3
taxus812

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Conecticut - USA

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Perhaps they warped ?

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12-19-2011 03:21 AM  5 years agoPost 4
Sam2b

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Seattle, WA

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Good point - I've loosened the bolts as well with no success. Like I said I have put the entire tail assembly on the magnetic balancer clearly confirming the issue (hub, grips, bolts, nuts and blades 180 degrees apart).

Re: warped. Well, if so then they warped on their own and warrant a replacement in my opinion. This is the 2nd time tail blades have gotten out of balance on their own on my heli. Perhaps I pirouette too much?

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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12-19-2011 03:42 AM  5 years agoPost 5
dkshema

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Cedar Rapids, IA

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This is the 2nd time tail blades have gotten out of balance on their own on my heli.
Maybe you should investigate the mechanical parts in the tail. Bearings, thrust bearings (if present), and perhaps a bent tail rotor shaft.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-19-2011 05:31 AM  5 years agoPost 6
Sam2b

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Seattle, WA

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Thank you, I've already dial indicated the tail shaft and only with 0.002" run out (acceptable). Thrust bearings ok. Again I will say all is perfectly smooth with a new set of blades.

Has anyone experienced tail blades going bad by themselves without impact or damage?

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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12-19-2011 05:49 AM  5 years agoPost 7
RAK402

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Alhambra, CA

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"Has anyone experienced tail blades going bad by themselves without impact or damage?"

I have not had a set go out of balance, unless I knocked a chunk out of them (in which case I replace them).

This includes the wooden ones we used to fly 30 years ago, Kavans, Kyosho plastic, TT Plastic, Align Plastic, Align CF, CY CF, Compass Plastic, every variation of Tail Blade that KBDD has made, and some I cannot remember.

I have seen CF tail blades get abused to the point that they are starting to de-laminate and get soft, causing vibration-but only a couple of times on severely beaten up blades. They were very flexible.

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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12-19-2011 07:31 AM  5 years agoPost 8
nwmtech

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Bellingham, WA

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Sounds like a set of Edges

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12-19-2011 01:04 PM  5 years agoPost 9
Jeff polisena

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westpalmbeachflorida​usa

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Yes , I've had new sets cause vibes as well as sets that have been on airframe for some time with no damage . I can't tell you if they warped or the material inside shifted .it seems to me that the surface changes to cause turbalance between the two tail blades . I can't prove wrong but you can't prove to be rite ?

I stole it ,flew it and gave it back ;)

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12-19-2011 01:20 PM  5 years agoPost 10
sinte

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Tacoma,WA

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Wow, that's pretty interesting Sam. Now that I'm not wadding up my heli every 3 or 4 weeks, I may actually have a set of tail-blades live long enough to experience this. I wonder if it could happen to the main blades as well?

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12-19-2011 02:14 PM  5 years agoPost 11
BarracudaHockey

rrMaster

Jacksonville FL

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The plastic tail blades that came with the Vibes would wallow out and elongate the bolt hole and cause all kinds of tail nonsense till they were chucked and replaced.

Andy
AMA 77227
http://www.jaxrc.com

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12-19-2011 03:23 PM  5 years agoPost 12
Jerry K

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Houston Area

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I will now pursue a free replacement because the "bad" blades look flawless
Replace the blades and move on! There is no expressed warranty on the blades we run. You found the problem!!!

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12-19-2011 03:37 PM  5 years agoPost 13
Jeff polisena

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westpalmbeachflorida​usa

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Parts on everything have a shelf life , if you replaced a part and problem goes away then shelf life expired . I would recommend looking at other parts for ware , theas parts can course good parts to go early also ..

I stole it ,flew it and gave it back ;)

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12-19-2011 05:02 PM  5 years agoPost 14
Gregor99

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Western Wa

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I will now pursue a free replacement
Dang. I was hoping you were going to cut them open (carefully) to see if something shifted. If a particular brand of blade is prone to invisible deterioration, it would be something we would all want to know.

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12-19-2011 05:36 PM  5 years agoPost 15
bkervaski

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Birmingham, AL, USA

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I've had them split along the seam before causing odd tail issues ... wasn't noticeable just looking at them because the seam would only split when they started spinning.

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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12-19-2011 06:09 PM  5 years agoPost 16
cbflys

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Nesconset, NY - USA

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Yep, same thing here. Look fine on the bench and the seam opened up during flight. They just got tired!

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12-19-2011 07:24 PM  5 years agoPost 17
Sam2b

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Seattle, WA

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Who has their recomendations on quality 115mm tail blades that are designed to last? It is difficult to beleive that I have the ability to fly parts to dealth, and it is lame parts aren't designed to last (or with short shelf life). My particular set was only 2 months old.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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12-20-2011 01:11 AM  5 years agoPost 18
Jeff polisena

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westpalmbeachflorida​usa

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It might not be blades , no way of actually telling but if you put a new set on and vibes go away, give some time and if vibes come back then you have other issue . Keep old set as spares until you find out . You could have fatigued plastic parts or bearings and when you put a new set of blades it changes the stress enough to stop vibes for a while .

I stole it ,flew it and gave it back ;)

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12-20-2011 02:38 AM  5 years agoPost 19
Sam2b

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Seattle, WA

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Thanks, Jeff. But did you read what I typed when I said I balanced the entire tail assembly with the blades on and 180 degrees apart? That is the hard evidence one blade if fouled up internally (or elsewhere) being badly off balance to the naked eye ball. I also have metal tail grips, so that makes my entire tail assembly free of any plastic. But thanks for the suggestion - I have to be open to all possibilities too. I betting on bad blade(s).

I keep forgetting this is the world where everyone only reads every 5th word in a sentence.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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12-20-2011 03:00 AM  5 years agoPost 20
himaxkeith

rrApprentice

Atlantic City NJ.​USA

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Check if you have a bent tail rotor hub. I went thru few sets of C/F tail blades before I found out the tailrotor hub was bent. First set I was flying and slung a tail blade whin 5 minutes into a flight. The bolt was still in place just the blade was gone. Installed a new set hovered seen the vibration during hovering shut it down and inspected the tail blades and found the bolt holes elongated on the blades. Changed out the tail shaft put the tail back together hovered again and samething happened again elongated the tail blade mount holes. Changed the tail rotor hub problem solved.

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