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450 PRO Class Electric Helicopters 450 PRO Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 11-29-2011, 10:55 AM   #1
trexpro
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Default T-rex 450 pro V2 serious tail bearing problem

A friend Ronald of mine was suffering from a severe tail wag of his new (1 month old and never crashed) T-rex 450 pro V2!

We first suspected the gain (BeastX), but that was not the problem.
Tail servo was ok, tail control link and slider were ok. (without binding)
Push rod and ball links where ok, and where sliding without binding!
Until I noticed something, I saw a little gap between the metal tail holder and the tail blade grip! The gap appeared larger than normal so I took off the blade grip and guess what The blade grip bearings were completely broken to pieces!
I have the bearings replaced and the tail wag was gone.

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Last edited by trexpro; 12-03-2011 at 06:38 PM..
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Old 11-29-2011, 03:23 PM   #2
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Align is really having a problem with the bearing in the tail for some reason I had the very same problem. Nasty wag until I replaced the tail bearing and wag disappeared.
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Old 11-29-2011, 03:37 PM   #3
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Quote:
Originally Posted by Spork01 View Post
Align is really having a problem with the bearing in the tail for some reason I had the very same problem. Nasty wag until I replaced the tail bearing and wag disappeared.
+ 1 and far too many tail slop
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Old 11-29-2011, 04:00 PM   #4
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Thanks danny for all your help
Ronald.
The Netherlands.
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Old 12-02-2011, 04:49 PM   #5
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You will not believe it but my 450 pro V2 tail bearings buckled also today, I was doing a backflip and out of nowhere my tail responded no longer. I was barely able to save my heli. On the ground I noticed the same gap between the metal tail holder and the tail blade grip! The blade grip bearings were also completely broken to pieces.
The only difference is that my 450 pro V2 has 155 flights on it!

I dont trust the Align bearings no more!
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Old 12-03-2011, 02:50 AM   #6
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Wich bearings can you get to replace the align ones?
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Old 12-03-2011, 03:24 AM   #7
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Quote:
Originally Posted by -kenny- View Post
Wich bearings can you get to replace the align ones?
I'm thinking about boca bearings stainless steel

measurements we need are: 3x6x2.5mm and 2x5x2.5mm.

Regards danny
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Old 12-03-2011, 06:46 AM   #8
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Must agree Boca bearings are some good ones to use.
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Old 12-03-2011, 04:29 PM   #9
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Happened on my 450 pro V1 as well.

Heat up the grips to get the old bearings out (loosens up the thread lock).

Replace with some good replacement bearings from a hobby store (online or local).
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Old 12-03-2011, 04:54 PM   #10
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I recently had the same tail bearing issue with my new 450 pro v2..

The bearing disintergrated as per the first post..

The problem was that the outer race of the bearing remained glued to the tail grip... and was glued tight!!! I tried everything to get it out ... I even heated the tail grip... which turned a black tail grip into a "Bronze" coloured tail grip.. aaaarrrrgggghhhhh...

Eventualy, I had to mill out the outer race with a 5mm mill bit..

Now my pro has a half black / half bronze coloured tail... so be careful if you decide to heat the grip..

PS: My pro had only 15-20 flights on it as at the time of the bearing failure -
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Old 12-03-2011, 06:31 PM   #11
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been through 2 tails so far on my v2 pro
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Old 12-03-2011, 06:33 PM   #12
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it seems I am not alone with this problem !!

It is a serious design issue of the blade grips on the 450 pro version or it's a low quality bearing problem?

All the stress and force is on the outer bearing (2x5x2.5), the only way to solve this problem for good is to use thrust bearings! the second best solution is to use high quality bearings, but those bearings are expensive and should also be checked regularly.

Anyway the use of a radial bearing with such axial loads is not good!

maybe someone knows if a replacement tail (or blade gips) with thrust bearings exists that fits the 450 pro, or are there thrust bearings that fit in the original Align 450 pro blade grips?

Regards danny
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Old 12-03-2011, 06:53 PM   #13
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I had some nice bearings from my touring car that are same size. I also ordered some from r-bearings.com. they sale an entire retrofit kit for 450. Cheap and way better bearings.

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Old 12-04-2011, 08:31 AM   #14
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Quote:
Originally Posted by smrceo View Post
I had some nice bearings from my touring car that are same size. I also ordered some from r-bearings.com. they sale an entire retrofit kit for 450. Cheap and way better bearings.

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Hi smrceo,

Did you also have a tail bearing issue before you buy the entire retrofit kit ?
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Old 12-05-2011, 04:12 AM   #15
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Here is yet another Thread on the same subject http://www.helifreak.com/showthread.php?t=309898
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Old 12-05-2011, 05:19 AM   #16
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Quote:
Originally Posted by trexpro View Post
Hi smrceo,

Did you also have a tail bearing issue before you buy the entire retrofit kit ?
Yes my grip bearings were toasted. I think they were fine out of the box but since they were so weak and a real light tail strike on anything side loads them so bad at the elms they spin that they just fall apart. Im running 500 skids now and the new bearings in grips are getting it done. Good luck!

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Old 12-07-2011, 12:26 AM   #17
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I am having the same issue on my 450Pros and really don't like how much slop there is in the tail control. Are there any companies that make a good replacement tail assembly for the 450Pro?
Thanks
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Old 12-07-2011, 08:19 AM   #18
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Quote:
Originally Posted by maverickk View Post
I am having the same issue on my 450Pros and really don't like how much slop there is in the tail control. Are there any companies that make a good replacement tail assembly for the 450Pro?
Thanks
There are good upgrades to get the slop out of your tail. KDE makes dual flanged
radial ball bearing supported tail grips and precise machining tolerances for the brass bushing sleeve
en. Align has the metal bell crank upgrade and there are also complete new tail pitch sliders to get rid of the slop, but there are no upgrades for the blade grips.
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Old 12-07-2011, 05:56 PM   #19
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Quote:
Originally Posted by maverickk View Post
I am having the same issue on my 450Pros and really don't like how much slop there is in the tail control. Are there any companies that make a good replacement tail assembly for the 450Pro?
Thanks

this part took 90% slop out of my tail.

http://hobby-wing.com/gsc078.html
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Old 12-08-2011, 01:32 PM   #20
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Quote:
Originally Posted by Spork01 View Post
this part took 90% slop out of my tail.

http://hobby-wing.com/gsc078.html
that is cheap
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450 PRO Class Electric Helicopters 450 PRO Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.

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