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

My Posts This: Topic  Forum		The oneway bearing on my CTD has been acting up, For no reason it will start slipping
I replaced it once already and the second one is starting to do the same. If I go into idle up the jump in rpm's will make it slip
(auto time)

If I can't find the cause of what is causing the OW bearing to fail I will be considering putting in the old intermediate drive from the Hawk pro

Any thoughts ??

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
03-29-2009 01:34 AM
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SteveH
rrProfessor
Location: Texas

My Posts This: Topic  Forum		Typically when the Torrington bearings start working intermittently, you need to change not only the bearing, but the surface they run on. In your case, that would be the shaft.

SteveH
Magnum Fuel
AMA76186
03-29-2009 01:39 AM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		That's a good possibility Thanks


The first unit spit metal fragments all over the lower frame
When I swapped out the bearing I also swapped shafts as well
so I installed a complete used unit which is now intermittent.

How do you tell if the shaft is worn ?

I have heard of someone else using direct drive (Hawkpro intermediate VS OW bearing)

Other than increased drag when autoing what other Ill effects could there be ?

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
03-29-2009 02:27 AM
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SteveH
rrProfessor
Location: Texas

My Posts This: Topic  Forum
Quote 
How do you tell if the shaft is worn ?

It doesn't necessarily have to be worn...just irregular surface will do it.

Quote 
Other than increased drag when autoing what other Ill effects could there be ?

That's the main thing, but I wouldn't do it. I'd much rather have the standard, non-driven tail than a direct drive.

SteveH
Magnum Fuel
AMA76186
03-29-2009 03:49 AM
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oldfart
Elite Veteran
Location: Vancouver, Canada

My Posts This: Topic  Forum
Quote 
If I go into idle up the jump in rpm's will make it slip

May I suggest that you take a serious look at what is causing it...as it is not an issue with others....the clue is in the statement quoted....

Did you ever notice that there is never much of a change (if any) in rotor speeds when the top flyers switch from normal to idle up? They all know that such an abrupt increase in torque is very hard on any one-way bearing.

That is why they will set their curves to be very similar, at any point on the stick where they will be switching from one to the other. This results in no abrupt change in rotor speeds.

What are the differences you have set in your normal head speed and your idle up head speed??
03-29-2009 04:04 AM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		the increase is only about 100-150 rpm HS



I have heard of others having their OW locking up but I have never read of them slipping yet
The HS increase isn't that big of a differance

is it possible that the engine is misaligned to cause it to wear out prematurely ?

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
03-29-2009 04:14 AM
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oldfart
Elite Veteran
Location: Vancouver, Canada

My Posts This: Topic  Forum		What are the rotor speeds involved? ... not the differences.

What temperatures are you flying in?

Are you switching while your rotor is loaded?

Is this CTD in a standard Raven with an OS Hyper 50 using the gray or black gear?
03-29-2009 04:59 AM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		1850 & 1950 using a GV-1
+ 10* C
I switch during a hover
used in a Hawk pro with OS37 and grey gear with 13T pinnion

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
03-29-2009 01:05 PM
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Dilbeck
Key Veteran
Location: Springdale Arkansas

My Posts This: Topic  Forum		Just when I thought I was getting into the "lingo" of this hobby BM1 comes up with (CTD/OW) and the like. For those that read and try to understand the problem at hand, please help us with the abbreviations.

If it doesn't fly sell it!
03-29-2009 07:31 PM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		CTD= constant tail drive
OW= One way
HS= head speed


So has anyone else tried a direct drive system other than those who have had their OW bearings lock-up ?

I don't seem to have very much luck with Century's OW bearings lately
guess they ship the substandard ones to Canada

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
03-29-2009 08:20 PM
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Dilbeck
Key Veteran
Location: Springdale Arkansas

My Posts This: Topic  Forum		Not sure, never experienced the problem you speak of. Must be a Canada thing, after all its very cold in Canada and things dont seem to function as well as where its warmer. I get a chill just thinking about you guys.

If it doesn't fly sell it!
03-29-2009 08:30 PM
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Rotor Trash
Senior Heliman
Location: Missouri-US

My Posts This: Topic  Forum		You guys in Canda are tougher than woodpecker lips. There is no way I could take that much cold

Load'r High and Let'r Fly !!!
03-29-2009 08:44 PM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum
Quote 
tougher than woodpecker lips

LOL never heard that one before

I have flown in -15* C with no prob (well almost no probs's)

I'm realy thinking of this Direct-drive mod though it would be one less thing to fail.

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
03-29-2009 10:09 PM
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Furious Predator
rrProfessor
Location: Kitchener, Ontario, Canada

My Posts This: Topic  Forum		you get used to the cold for the most part. crappy for flying though. i have a radio glove, but i find it is really awkward to fly with it.

Shawn
Team Leisure-Tech
03-29-2009 10:16 PM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		FP do you see any short coming of using this direct drive?

The hardest thing about flying in winter IS "it's just to damn cold!"


nitro very hard to start (keep fuel warm in vehicle)
fingers get frozen ( Trans mitten )
batteries get cold (keep warm in pockets until use)
Gyro doesn't do well below -10* C

F@ckit and fly Sim, wait for spring

been practicing auto's on sim which realy paid off when my Freaking OWB decided to slip,
which after landing and restarting flight from normal mode it held up for 3 more tanks with out incident

I wouldn't mind finding out why 2 OWB failed in row on same machine


F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
03-29-2009 10:35 PM
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Dilbeck
Key Veteran
Location: Springdale Arkansas

My Posts This: Topic  Forum		Something is crooked/bent/binding/causing friction. Or its just to dang coooold!!

If it doesn't fly sell it!
03-29-2009 11:01 PM
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Furious Predator
rrProfessor
Location: Kitchener, Ontario, Canada

My Posts This: Topic  Forum		i dont really have any experience with a hawk, so i cant say much. but i have flown a number of other helicopters in the winter with little or no issue on the one way bearings.

the only time i have had a one way slip in the past was on the starter of my old Nexus. it would tend to slip more frequently in colder weather then the summer. like the day i landed my nexus because it was feeling sluggish...only to find out that ice was building up on the blades.

i would not expect 10C to be low enough of a temp to have that kind of effect on the one way.

BUT.

if you have been flying it all winter, the lower temperatues may have done the damage, and it is only showing up now. it may have something to do with different materials shrinking different amounts, causing the clearances to change. or maybe if your using a grease of some type, it may get too thick in the colder weather. I personally use Automatic tranny fluid to lube one way bearings.

Shawn
Team Leisure-Tech
03-29-2009 11:04 PM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		Flew only my 450 this winter (it was too cold for nitro this year)
I have only flown maybe 8 tanks on it so far this year
and it is set-up the same as a Raven only it's mccpm and it's a 30 size

Maybe I wash it out with degreaser then re-apply tranny fluid

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
03-29-2009 11:13 PM
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the Wasp
rrProfessor
Location: Vt

My Posts This: Topic  Forum		BM, I have not had this problem so I can not coment on it,, but let me ask if you grease your Oneway Bearing before installing your Main Shaft ??
a friend, a long time heli flyer of over 30 years once told me to never use thick grease like Wheel Bearing grease on the Oneway Bearing because it will pack hard in the back of the bearing as the bearing spins/creating problems such as locking-up,,
I use Loctite Viper Lube 36780 for 5 or so years now with never a problem, it is a thin High Temp grease that you can buy in a tube as small as 1cc for about $1, this 1cc tube will be enough to lube the Raven/Hawk's Oneway Bearing a few times..

http://search.aol.com/aol/search?q=...0&s_it=spelling

hope this helps !!

Jim
Buzz Buzz Buzz
03-29-2009 11:28 PM
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the Wasp
rrProfessor
Location: Vt

My Posts This: Topic  Forum		opps,
not that you need a High Temp grease for this application, it just that it's a good grease..

Jim
Buzz Buzz Buzz
03-30-2009 01:16 AM
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Century Hawk - 50NX - Raven - Predator > Constant Tail Drive Failure ?
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