CNC tail failure

[Happy|Harry]

After seeing the failed parts in the flesh the Hobby shop will not replace the tail until the manufacturer has sorted out the problem!

So looks like a QuickUK raptor tail for me.

Eddy

i just ordered a QUK tailcase and tail grips set for my e620 but to replace the cncheli tail setup on my CF Hurri i ordered the gaui thrusted cnc grips and also the gaui cnc pitch slider from fung at flying-hobby, hopefully the gaui cnc tailcase isn't too far off!

gaui cnc tailrotor >> http://flying-hobby.com/catalog/product_info.php?cPath=3_30_38&products_id=2643
gaui cnc tail pitchslider >> http://flying-hobby.com/catalog/product_info.php?cPath=3_30_38&products_id=2554

[worldofmaya]

Hi!
I'm using the Gaui CNC Tail Slider with the new Trex 600 Tailblade Grips... works quit well...the CNC slider is a real improvement compared to the plastic thing. Much smoother...
-klaus

[bearwood]

Thanks Phil. I didn't realise these were out, I don't think they are available here in Aus yet and they are half the price of the QuickUK raptor tail.

[mjdee14]

Heli direct sent a Return # for the grips....since I hadn't installed them. I'm not taking any chances on them either. Sonix better make improvements if they want to sell any more.

[GatoVolador]

I didn't like the Gaui tail or even the upgraded Gaui thrust bearing grips so I decided to play it safe and use proven parts -- a Trex 600 stock tail assembly. It works great, was cheap ($50), and only required a slight mod to the boom (drilling a new tailcase locator hole) as well as putting a shim around the boom and between the Trex tailcase to make up for the ~.5mm diameter difference. I just whacked-off a piece from an old stock Gaui aluminum boom, used some tin snips to cut the piece apart so I could spread it over the heli's boom and then clamped the Trex tailcase over that. The mod of the tail pulleys are the same so no problems there. Works great! I'll post some pictures...

[Happy|Harry]

well my gaui cnc bling has arrived :glasses2:

(click pics for full size images)
http://freespace.virgin.net/catherine.smith1/Hurricane550HV/GauiCNC-thumb.jpg (http://freespace.virgin.net/catherine.smith1/Hurricane550HV/GauiCNC.jpg) http://freespace.virgin.net/catherine.smith1/Hurricane550HV/GauiCNC1-thumb.jpg (http://freespace.virgin.net/catherine.smith1/Hurricane550HV/GauiCNC1.jpg)

nice quality so far, and i'll report back on how they work out on the heli :)

[Phoinix]

I just got these GAUI CNC tail and i must say i'm impressed. It's nothing like main grips, you can actually take them apart, grease them and put them back. The hub is also nice and strong. Also the new tail pitch slider. Like someone already said, runs much smoother.

What about the ALU swash. I didn't know it existed. I got the black one on my first hurry, and now i got the ALU one. Is it any better regarding swash separation?

[worldofmaya]

Hi!
My local dealer confirmed that for the new swash they "solved" this problem.
-klaus

[Phoinix]

Thank you Klaus. New swash looks much better, if it functions that good, we are all problem free :thumbup:

[neohp]

Hello all,

Sadly, I've got to report another GAUI cnc tail failure....
I've the cnc tail (i guess a old one because my heli is 1 year old).

I'll send pictures very shortly but one of the tail grip went off, but i haven't been as lucky as you were.
I was pretty high, performing pirouette. I saw a black piece going away, lost the control, hit the cut off switch and made a hole in the earth.
Very bad damages. 2 servo, main blades (mah carbon), spindleshaft tail boom etc etc....$$$

What i think is that the tail blades i was using (nhp 95mm) was way too big for the tail hub.
If i'm not the only one, i guess that this very part is weak anyway...

Jerome from france.

[mjdee14]

Hello all,

Sadly, I've got to report another GAUI cnc tail failure....
I've the cnc tail (i guess a old one because my heli is 1 year old).

I'll send pictures very shortly but one of the tail grip went off, but i haven't been as lucky as you were.
I was pretty high, performing pirouette. I saw a black piece going away, lost the control, hit the cut off switch and made a hole in the earth.
Very bad damages. 2 servo, main blades (mah carbon), spindleshaft tail boom etc etc....$$$

What i think is that the tail blades i was using (nhp 95mm) was way too big for the tail hub.
If i'm not the only one, i guess that this very part is weak anyway...

Jerome from france.

Please post pictures of your CNC assembly...I don't think it's a Gaui...don't think they had it a year ago.. Or does it have the black plastic blades holders and it's the silver metal hub that broke?

Maybe it's a Sonix.....so please post picture we all would like to know.

[neohp]

of course i will. I'm not home right now.
Here is the picture which belong to history now : before the crash.
For the broken part picts, it will have to wait until i this week end.

http://neohp.free.fr/PICT0330.JPG

What do you guys think ?
Does anybody know if a kasama trex 600 tail would fit ? or at least the tail hub ?
I'm worried now. It was to scary to happen again.

[neohp]

And just to let you know :

My conf is (was) Z30/fp3700 25 6s pignon 42/61.

cheers

[GatoVolador]

of course i will. I'm not home right now.
Here is the picture which belong to history now : before the crash.
For the broken part picts, it will have to wait until i this week end.

http://neohp.free.fr/PICT0330.JPG

What do you guys think ?
Does anybody know if a kasama trex 600 tail would fit ? or at least the tail hub ?
I'm worried now. It was to scary to happen again.

I'm using the stock Trex 600 tail assembly with no problems. Only modification is to drill a locator hole on the boom for the tailcase and to wrap a shim around the boom to makeup the approx .5mm difference in diameter of the larger Trex tailcase. I just cut a small piece of an old stock Gaui boom and wrapped it around the boom -- works perfect! The Trex tail pulley is the same mod as the Gaui so no problems there. I would assume you could adapt a Kasama Trex 600 tail in the same way -- I don't see why you couldn't...

[GatoVolador]

Looking at your picture that is definitely not the Gaui CNC tail. That looks like the HeliDirect/CNC Helicopter tail (not sure who the actual manufacturer is). There are other reports of their stuff breaking...

[neohp]

As i bought my heli from a friend i never realized that. It looks like the helidirect cnc tail indeed.
Maybe the metal alliage is not the best on this series...That's not a good buying advice that's for sure.

So Gatovolador, if i get you right, The tail shaft as well as the tail pulley are the same diameter/angle between gaui/trex600/kasama mod ? I'll be able to keep the cnc tail box and adapt it. Or i'll need to buy the full t rex tail... ?

[GatoVolador]

As i bought my heli from a friend i never realized that. It looks like the helidirect cnc tail indeed.
Maybe the metal alliage is not the best on this series...That's not a good buying advice that's for sure.

So Gatovolador, if i get you right, The tail shaft as well as the tail pulley are the same diameter/angle between gaui/trex600/kasama mod ? I'll be able to keep the cnc tail box and adapt it. Or i'll need to buy the full t rex tail... ?


I'd not advise mixing/matching Gaui and Trex/Kasama tail parts. I think if you want to go for a Trex tail then you should get Trex everything (with maybe Kasama grips if you want although not necessary in my opinion...) For about $50 you can get everything you need which is:
Tailcase
Tail rotor shaft (these come two per pack)
Tail rotor grip assembly (you can get the stock improved version or Kasama)
Pitch slider assemblyGeometry lines-up fine. I decided to go for a Trex 600 tail because of vibration issues I was getting with the Gaui tail. I believe it might have to do with the excessive length (which isn't necessary) of the Gaui tail output shaft. The Trex 600 output shaft is shorter and a bit larger in diameter. Overall the Trex 600 parts are "beefier" and have eliminated the vibration issues I was having.

[neohp]

excellent. Thank for the help.
My tail look like this one http://flying-hobby.com/catalog/product_info.php?cPath=3_30_38&products_id=2405
which is listed as stock cnc upgrade. i don't get it....

[mysticmead]

yeah... there are a few places that list it as a CNC 550EP part.. BUT, they don't say it's a GAUI part... that's the only difference I've seen on the sites selling the parts.

[mjdee14]

excellent. Thank for the help.
My tail look like this one http://flying-hobby.com/catalog/product_info.php?cPath=3_30_38&products_id=2405
which is listed as stock cnc upgrade. i don't get it....

That is a CNC tail made by Sonix and sold by several HS.

There was another thread about this part breaking and I had a new one ready to install.

I wrote to Helidirect and they took it back for a store credit.

Redi Helli has the real Gaui CNC tail in stock.

http://www.helifreak.com/showthread.php?t=66766&page=4

see the page and pics above, you'll see the difference.

What I can't believe is they sell the Helidirect unit for Trex600's also. They must be blowing apart like crazy !!

Glad I didn't install mine and loose a heli for a Bling part that was bogus.

[bearwood]

Yep that is the Sonix unit.

neohp sorry to hear yours failed in flight. Be interested to see the pics of the failed unit as well.
I am currently using the Sonix tailcase and the Gaui plastic slider and rotor with no problems so far. I will upgrade to the Gaui CNC tail and slider sometime soon.

Eddy

[3D Dave]

Hey guys. I'm sorry to hear about these problems with the H550 tail. I was thinking about getting an H550 as my 2nd heli (1st is a Thunder Tiger mini-Titan). My other choice is the Thunder Tiger E550 Raptor.

With all these tail problems I guess I should hold off until Gaui improves this weak point. I don't want to have to upgrade a bunch of parts just so I don't "loose" my heli. I want it to be "ready to rock" out of the box.

In the meantime maybe Gaui will start offering a kit that has both the CF frame AND the aluminum head.

Dave D.

[Phoinix]

Dave, you misunderstood the problem. GAUI tail rotor is not the problem. HDX tail, that can be also used on hurricane, and in some cases people have flown then, that one is the problem. GAUI tail rotor is farely new and works without a problem. It has a different rotor hub. I just installed it on my two hurricanes and i can't complain.

If you are buying hurricane, be sure to buy GAUI tail rotor, not HDX. Also, i can recomend GAUI tail pitch slider. It's not just bling, it runs much smoother that plastic variant.

HDX tail set:

http://flying-hobby.com/catalog/images/Hurricance_CNC_Tail_Complet_Set_B.jpg


GAUI tail rotor:

http://flying-hobby.com/catalog/images/CNC_Tail_Rotor_Grips_204650_B.jpg

GAUI tail pitch slider:

http://flying-hobby.com/catalog/images/CNC_Tail_Pitch_Slider_Set_204640_B.jpg

[neohp]

Hello all,

so as promised, here are the picts...
That well engineered part cost me 100 $....
Thank you hdx. thank you.

http://neohp.free.fr/download/tailfail1.jpg
http://neohp.free.fr/download/tailfail2.jpg
http://neohp.free.fr/download/tailfail3.jpg

[falconea45]

This is shades of the TREX450 tail problem. You never stood behind one in a hover unless you wanted your eyes parted. They modified their tail hub....