Tail Pitch Slider Problem ?

[neotask]

hi, i try to tell my problem with the X7 and the tail pitch slider.

my X7 have 40 flights without crashes and i dont fly hard 3D. but at the weekend i see that the sliderplate is loosing some metal on the left side/inside. it looks like sanding. now my tail have a lot of tolerance.... sorry for my bad english

is this normal ?

Olli

[Minchy]

That part should not be spinning,... so there is a problem you need to sort out.

[akamullen]

Your bearings may be worn out and not rotating as they should, this may cause that issue. take the assembly apart and rotate the bearing with your finger and see if they are very smooth. if not, replace them.

[neotask]

the bearing is very smooth. i cant find any fault

Olli

[akamullen]

Hmmm, very strange. I cant think of any other reason that would be spinning that much. it should be able to rotate freely, but not spin that much.

Hopefully someone else will chime in with an idea or two.

[neotask]

yesterday i was thinking about the funktion of the wheel and i mean that this wheel dont must spin. so it can be fixed with a headless screw on both sides of the bolt. so the wheel cant rotate longer but have enough place to work.

i dont understand why gaui let spin the wheel because there is a bearing inside that can spin on the tail shaft. this must be enough, or not ?

if i look at other helicopter i cant see a double spin part.

only my mind...

Olli

[neotask]

hi, im fixed the slider with headles screws on both sides of bold. so it cant rotate again. now only the bearing is rotating on the shaft. today i fly some lipos with the mod and it works great.

Olli

[Chris Sexton]

See now I would worry you are defeating the purpose. If they wanted they could have just machined pockets for the pins on the top and bottom. They made it possible to slide so that if the bearing locks up you aren't necessarily going to have a total failure and crash.

If you are having this disk spin enough to wear through the metal, I think you have a bearing problem. Even if it feels smooth, under load it is obviously spinning.

Just my 2 cents.

[neotask]

no, the bearing is absolut perfect working. i know what you mean, but look at all other tails like Align, Compass,TT, SAB, Minicopter ..... they all worked only with the one bearing on the shaft and i dont have seen any tail that crashes beacause of a bad bearing. so at the X7 it would also work fine . i will see ...... i think it is a construction fault by Gaui that the slider can spin around the bolts. it can be work some time, but later it will be sanding at every tail. let us wait some weeks more and see what happen .

Olli

[Jesse]

when mine started wearing like yours it waas cause the arm that holds the bell crank came loose from the tail box. even if was spinning it shouldn't contact that part.

[Minchy]

As you probably understand, when the pitch control arm is moved through its range that the pins on the end of the arm do need to move slightly on that part of the slider because of the arms swing geometry.

It is fine what Gaui have used to achieve this, as the friction/tension of the pins on that part of the slider, should always be greater than the sliders friction on the shaft ,... hence that part of the slider where the pins from the arm meet, shouldn’t spin. I would still be finding out why it wants to spin (bearings, slightly bend shaft, burr on shaft, the two parts of the slider catching now and then where they screw together, maybe under certain tail blade force).

Good luck with sorting it out.

David Mincherton

[neotask]

hi, so some time is going from the last post. now i have buy a complete new tail and have the same problem again.
i buy a new one only for testing

it looks like a fail konstruct. the same problem ist now at the new Goblin 500. a lot of pilots have this problem at the Goblin.

so it looks not for a problem with my bearings because a lot of other helis have this fault.

i think i will contact gaui about this.

Olli

[_Dekker]

Originally Posted by neotask

hi, so some time is going from the last post. now i have buy a complete new tail and have the same problem again.
i buy a new one only for testing

it looks like a fail konstruct. the same problem ist now at the new Goblin 500. a lot of pilots have this problem at the Goblin.

so it looks not for a problem with my bearings because a lot of other helis have this fault.

i think i will contact gaui about this.

Olli

I agree the design is not perfect on that point.
However, we have 4 X7's at our field and none have ever had this problem. Strange.

[neotask]

should be a 50:50

i read some Threats about the X7 in different comunitys an there are some other X7 pilots who have the same problem.
i dont know ....

Olli

[pxpep]

My X7 do it too. I will lubricate it.

[helibag.de]

Originally Posted by neotask

hi, im fixed the slider with headles screws on both sides of bold. so it cant rotate again. now only the bearing is rotating on the shaft. today i fly some lipos with the mod and it works great.

Olli

Hi Folks,

you don´t need any screws to fix the problem. You must only look, that the tail don´t do the complete path. There must be a distance to both sides of 1 mm. Then the ring can be rotate free and there´s no damage like this on the photo.

Regards

Carsten

[pxpep]

I have 2 X7. One of them did exactly what you can see in the photo. I bought a new piece and blocked it with a screw. I also blocked the slider on the other helikopter. This is over a a year and 200-300 flight ago and it works perfect.
SAB have had similar issues with their Goblin 500 series helicopters and all new ones produced have them blocked when they leave the factory. Unfortunaly they now are made of plastic...

[super]

The new kit I am building has this issue too. Seems to be lots of small niggles with these X7 kits. :-\ keep thinking I should have gone Align.

Cheers

John

Sent from my Lenovo B8000-F using Tapatalk

[helibag.de]

Please look at the distance, i´ve written. That´s very important.

Regards

Carsten

[rcflyerheli]

I can't tell for sure looking at your photo, but I took a close look at my tail, and mine appears to have a shim between the edge of the yoke and the ring you have with the wear. I can't tell if there is one from your pix, but the ring on mine does rotate freely. If that yoke edge is contacting both the inner and outer race of the bearing inside the ring, that will sure cause it to rotate with the tail.

Like nearly every heli I have built, there is shimming I've had to do to take out machining tolerances. I just had to shim my new OWB to remove vertical play between the main and crown gears.

One note, if those two pins are tight in the ring slot, that would stop the ring from rotating. Something must be driving the ring, causing rotation, and it either has to be a bad bearing inside the ring, or the yoke rubbing on both races of the bearing. I don't see any other way for that ring to be rotating that fast.

I also looked at the manuals for all the heliz I have assembled. My goblin 700 is like the Align 700, 600, and 500 as well as my Logo 600 that I have built. All have two bearings with a spacer between them and the brass or bronze bushing going through both bearings and screwing into the yoke. If that is too tight, and you force that yoke into the inner and outer race, it will bind the bearing and cause that ring to spin. Or if it is just screwed too tight, it could distort the races of the bearings.