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JR-Spektrum . E-flite . Fast Lad Performance

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Century Hawk - 50NX - Raven - Predator > Constant Tail Drive Failure ?
 
 
Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum

Quote 
Maybe the cause is one or both of the support bearings of the primary shaft or mainshaft are worn and lock up momentarily causing strain on the one-way drive bearing.

That would be worth looking into but for the fact they are new
<6 gallons
OR
the fact that I do the bearing mod during the build

I didn't have this problem last year

It did it on a Hawk pro, a Raven and a K50
the 50's are swinging 620 blades
the 30 OS37 is swinging 550 blades

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
07-06-2009 12:41 AM
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rotormonkey
Key Veteran
Location: Ottawa, ON - Canada

My Posts This: Topic  Forum
Quote 
Funny...was out flying with others that have the original raven and when mine locked up I was talking about it (complaining) he said "I never had a problem with mine" and I said wow, have you checked it?? He said "well lets take a look"...sure enough he discovered it was locked up the hole time!

Yep, this was me

For the life of me, I didn't even think there was SUPPOSED to be a one way there! It's been locked up like that for as long as I can remember. No biggee.. Still autos fine. I suppose I learned to auto like that. Think it'll make a big difference if I free it up?
07-06-2009 03:06 PM
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rotormonkey
Key Veteran
Location: Ottawa, ON - Canada

My Posts This: Topic  Forum		Oh, and FWIW, I checked, and even the one I got from helihell with only a handful of flights on it was locked up too. Bad joojoo.
07-06-2009 03:13 PM
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imnxtc
Veteran
Location: Dawson

My Posts This: Topic  Forum
Quote 
Oh, and FWIW, I checked, and even the one I got from helihell with only a handful of flights on it was locked up too. Bad joojoo.

Where is "helihell" ??
07-07-2009 10:01 PM
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rotormonkey
Key Veteran
Location: Ottawa, ON - Canada

My Posts This: Topic  Forum		Ahh, I'm afraid he has other priorities atm. He sold all his stuff. Said he might get back into it in a couple years.
07-08-2009 04:42 AM
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Century Heli
rrAdvertiser
Location: CA. USA

My Posts This: Topic  Forum		Blade_Master1: please send in your CTD that has locked up and the shaft. We'd like to take a look and see what could be causing this issue. PM us for details.
07-10-2009 08:59 PM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		Thank You

I would like to know what is going on with them as well.
but when 3 out 4 ctd fail you gotta wonder what is happening.

if it was only me then so be it, but a friend of mine has a brand new NX with only a couple of gallons through it and it locked in the first gallon.

My Hpro slipped for a while but seems to be holding
my K50 also slipped on the first gallon
my Raven is locked up but can be forced free
and my spare is also not smooth and never installed

I wish Century would sell replacement bearings so I could change it
I believe they are only pressed in

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
07-10-2009 09:37 PM
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imnxtc
Veteran
Location: Dawson

My Posts This: Topic  Forum		This is all rather curious as I am sure there are a couple of thousand of those out there that are working properly. My experience with them is that all the ones I have seen have all been very trouble free, so I would be curious to find why yours and your friends are not.

Maybe it is something in the air in your part of the world
07-10-2009 09:55 PM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		is it possible they are sending the leftovers to Canada ??? LOL j/k

I'm not mad at Century nor do I blame them for my troubles.

But is very much appreciated when a Company backs their product
and it gives you confidence to know that you actualy bought a great product.

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
07-10-2009 10:14 PM
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rotormonkey
Key Veteran
Location: Ottawa, ON - Canada

My Posts This: Topic  Forum		I for one fly at a field where there's a lot of sand in the air, so I suppose that might account for it.

The first one that locked up on me, I hadn't done the extra bearing mod, and the shaft got eaten through. I have no idea when it locked up. My second one though was from helihell's heli, which only had a gallon or so through it before I took it off his hands. Though I did take it off his hands AFTER he'd crashed it.

Still, you'd think they'd put up with a little more punishment than that.

Anyways, the point I suppose is that mine have good reason to have locked up. I don't know about BM one way or the other, but RH50 crashed too before it locked up I think. Neither of the other guys fly at the field I do (sandy).
07-11-2009 02:46 AM
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Mr.Bowflex
Senior Heliman
Location: Toronto Canada

My Posts This: Topic  Forum		I too just started having a problem with my one way bearing in my constant tail drive slipping. Hovering seemed to be OK but any more power than that, with the increased torqued involved, it would slip and the engine would race and would have to auto down.

The CTD unit is 4 years has never been abused or in a crash before or had a hot start. I oil it periodically with tri-flow. I also fly from a grass field and there is no sand or loose debris to get blown around and my heli is always super clean.

Curtis
07-12-2009 04:08 PM
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Mr.Bowflex
Senior Heliman
Location: Toronto Canada

My Posts This: Topic  Forum		bump
09-05-2009 12:06 AM
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MotorRotor
Heliman
Location: Eastern Canada

My Posts This: Topic  Forum		I would guess after 4 years of use it may have just finally wore out.

We may get spoiled here sometimes with our Century helis. Some other brands of helis I have had, wore out their auto bearings (an a number of other items) a couple of times a season.
09-05-2009 01:07 AM
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Mr.Bowflex
Senior Heliman
Location: Toronto Canada

My Posts This: Topic  Forum		I did suspect that the whole bearing itself might be turning inside the the aluminum recess since there was a small amount of black type grease emitting from the edges of the bearing in the aluminum recess.
09-05-2009 02:28 PM
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Mr.Bowflex
Senior Heliman
Location: Toronto Canada

My Posts This: Topic  Forum

Problem solved!!!

After some troubleshooting, my Constant tail drive is actually working OK. The problem I was having was not the CTD bearing slipping, but the big auto bearing I left in the main gear when I installed the CTD assembly.

I did not want the driven tail during autos therefore I did not install the aluminum plug in the main gear, I left the auto bearing in there that was stock from the Hawk kits so that I can completely shut down the tail in a emergency. Basically, I have 2 auto bearings in the transmission.

Upon inspection of the big auto bearing, I found a small hairline crack (I spread it open with pliers for the picture) on the outside of the bearing. The bearing was spreading open under high torque loads (3/4- full throttle) and caused the inner bearing to slip and the engine to race followed by rotor RPM decay.
09-07-2009 10:24 PM
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Furious Predator
rrProfessor
Location: Kitchener, Ontario, Canada

My Posts This: Topic  Forum		wow, good find, thanks for posting.

Shawn
Team Leisure-Tech
Team HelixRC
09-08-2009 02:23 AM
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3 pages [ <<    <     1      2     ( 3 )    >    >> ]1500 viewsPOST REPLY
Ace Hobby . Esprit Model . Thunder Power RC

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Century Hawk - 50NX - Raven - Predator > Constant Tail Drive Failure ?
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