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JR-Spektrum . Gyro Hobbies . E-flite

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Thunder Tiger Raptors 30-90 - Imperio > Exploding tail on your raptors.
 
 
Ticidytoc
Senior Heliman
Location: Los Angeles, Ca.

That 90 had TT carbon blades. I cant say if they were perfect prior to the flight. I do know the heli was new in 9/05. Never crashed up until then. So if he dinged up the tail blades doing autos that very well may have been what encouraged the failure.

Matt
05-17-2006 Over year old.
 
 
RevGadget
Veteran
Location: Decatur, Alabama

Century tail rotor...

Quote 
http://www.heli-world.com/detail.aspx?ID=3976

RevGadget,
Allot cheaper too than buying all the parts separate.

Only thing is if the shaft diameter isn't the same you'll have to find a way to enlarge something (output shaft or the hole in the rotor shaft).


Thanks Scott, they have the same size shaft.


3D2me= One eye on the Tx, one on the Heli and my thumbs in between.
05-17-2006 Over year old.
 
 
Tday
Key Veteran
Location: Needham, MA

I ordered the quickuk unit and will let you know what it looks like. It's $50 shipped. I'm sure Rick's will have it soon, but I ordered it from the quickuk website directly.

2 + 2 = 5 for extremely large values of 2.
05-17-2006 Over year old.
HOMEPAGE  
 
 
J3DI
Senior Heliman
Location: Oswestry (52.865648N 3.033982W)

RevGadget/Scott

There is one other important measurement and that's the bolt to bolt distance of the century grips. The Raptor measurement is 70mm so any larger than this and you'll have to run smaller tail blades.

Dan

Your call is important to us.

If it's so important, answer the f*ckin phone!
05-17-2006 Over year old.
 
 
perfesser zero
Key Veteran
Location: Dublin, VA., USA

tweakit...

As it looks, it looks as if it's farther apart than the Raptor tail rotor. The smallest blades I've found are 80mm CF blades. I'd guess you'd have to look for the really wide ones I've seen floating around. I think the last time I saw the the length on the plastic blades they were about 85mm, blade hole to tip. Since this tail rotor assembly is for all Century ships I'd think that you could find blades to fit without trouble.

Later...

Scott!

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S
05-17-2006 Over year old.
HOMEPAGE  
 
 
SPB
Elite Veteran
Location: Athens - Greece

Or use the new Titan boom with 600 blades.

BTW the new QUK tail setup isn't it the same with the TT? It still uses two radial bearings so what's the difference?

Sorry for asking but I am also worried even if I never had a problem with my tails so far.


Sotiris
Sponsored by Greekrotors
myhelis.com Flying Team
05-17-2006 Over year old.
 
 
perfesser zero
Key Veteran
Location: Dublin, VA., USA

SPB...

Century unit is 3 bearings. Two radial and a thrust bearing.

Later...

Scott!

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S
05-17-2006 Over year old.
HOMEPAGE  
 
 
Yug
rrProfessor
Location: Niatirb Taerg

I reckon the only weakness is the bearings - the grips and hub (PV0499) are fine. I still havent come across a small enough angular contact bearing to replace the outer radial that's used. Does anyone know of a d5xD10x4 angular contact bearing ?
05-17-2006 Over year old.
 
 
Tday
Key Veteran
Location: Needham, MA

I'm with you on that Guy. Why change the geometry to fix a bearing problem. Tail authority is a key performance variable for sure and shorter tail blades just seems wrong. I'm intrigued by the quickuk grips and am imagining it eliminates a little more play back there. We'll see. Not sure what bearings, but I'll ask.
Tom

2 + 2 = 5 for extremely large values of 2.
05-17-2006 Over year old.
HOMEPAGE  
 
 
RevGadget
Veteran
Location: Decatur, Alabama

I don't think there will be a problem using the Century T/R set. I know now for sure that the blades are inter-changable, and the shafts are the same size and length.

The Century Grips/shaft are different to accommidate the extra bearing. I think I'll give it a go to be on the safe side because I have two of their Heli's. If it dosen't work, I'll inform you guy's.
Or maybe someone has already, who will post later. So keep looking out.


3D2me= One eye on the Tx, one on the Heli and my thumbs in between.
05-17-2006 Over year old.
 
 
Wa11banger
Elite Veteran
Location: Huntsville, Al

I guess I have been lucky.. I have a hangar full of R90's and have had R50's and even 30's and can honestly say I have never had any of this happen. Over a few years even, I do preflight inspections for the next day after every day of flying and if something is amiss that bird gets fixed or it don't fly the very next day. It looks like this guys bearings fell apart.. There are two reasons.. Either faulty bearings or faulty preventative maintenance.. You all have to look these birds over ALOT!!! You should see the military and civilian inspection lists for helicopters, you don't just build em and fly em, they have to be torn down, checked out, blah blah blah and so forth ALOT!!!

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, and KBDD teams
05-17-2006 Over year old.
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blade3d
Elite Veteran
Location: New Jersey

rob10000
. I now have this assembly on my 90SE with no problems.
-------------------------------------------------------

Do you know how much pitch you loose ?



Blade3d
05-17-2006 Over year old.
 
 
alvinrc
Veteran
Location: Mobile, AL, USA

You might need shorter TR blades with the Century tail hub, but the TR rotor diameter can still be the same. So no lost TR authority.
05-17-2006 Over year old.
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Wa11banger
Elite Veteran
Location: Huntsville, Al

shorter blades means a loss of contact area which will be a loss in TR authority.. Now with all of that said I do not think it will be enough for anyone to notice

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, and KBDD teams
05-17-2006 Over year old.
HOMEPAGE  
 
 
mcoccia
Key Veteran
Location: Central Jersey

New Bearings Faulty

I have never had a issue either. As I said earlier I have had brand new TT bearings bad right from the get go...in fact I just replaced my main shaft bearings and after 5 flights the main shaft bearings are notchy I have been ordering bearings from a different supplier and they have been working quite well, I also use the greaser tool.

Having a thrust bearing setup on a .90 is a good idea though.
05-17-2006 Over year old.
 
 
w.pasman
Elite Veteran
Location: Netherlands

I already had noticed that those TT tail rotor bearings are very low quality.

thread on new but broken tail rotor bearings

Probably they are way out of tolerance too, and therefore not meeting their specified sideways load capacity.
05-17-2006 Over year old.
HOMEPAGE  
 
 
baby_zyklon
Key Veteran
Location: Singapore

I have had that happen on a r50 running nhp 85mm. Tail grip bearing gave way, exactly at the 100 flight mark. My r30v1 with a upgraded v2 tail and bearings from local bearing shop have had more than 300 flights without a problem and running nhp85mm also. Back then I thought mine was just an isolated and single problem. However, recently, more and more are facing this same issue. Furthurmore, the outer bearing on the other grip that did not fail was also on the verge of disintergrating. This leads me to think that the stock bearings from tt is not really up to the industrial standard.
05-19-2006 Over year old.
HOMEPAGE  
 
 
KeeWay
Heliman
Location: Ontario, California

I was reading this thread and I found some thrust bearings that are 5x10x4, would one of these and a abec bearing be sufficient on a 90 using the standard grips? or do you need at least 2 radial bearings and one thrust bearing?

thrust bearings
http://www.vxb.com/page/bearings/PROD/RCB/Kit7149

Radial bearings
http://www.vxb.com/page/bearings/PR...earings/Kit1069

thanks
James
06-01-2006 Over year old.
 
 
Flying Tivo
Veteran
Location: Monterrey,NL,Mexico

Nice link

it just does not specify if one side of the bearing has a sligh smaller diameter so it will take the load. An email to them should clarify it.

Felipe

If life throws at you lemons......Squirt some lemon juice in the eye of your enemy!!!!
06-01-2006 Over year old.
HOMEPAGE  
 
 
KeeWay
Heliman
Location: Ontario, California

Flying Tivo

I just called them and they are all the same ID/OD. i guess if needed one can be made slightly smaller on the OD and larger in the ID by sanding/grinding..

Thanks
James
06-01-2006 Over year old.
 
 
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Thunder Tiger Raptors 30-90 - Imperio > Exploding tail on your raptors.
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