E-620 screeching noise

[Steve Bryant]

E-620 with less than 20 flights has developed a screeching sound around zero pitch.
I have replaced everything from the swash down, including bearings in the Z50-600.
Currently scratching my head as to what to do next.....

[litespeed]

E-620 with less than 20 flights has developed a screeching sound around zero pitch.
I have replaced everything from the swash down, including bearings in the Z50-600.
Currently scratching my head as to what to do next.....

Ear plugs come to mind! :)

It seems many are haveing this problem, including me, I think it just the harmonics of the motor/fan and frame/canopy/something.

I have an Orbit 30-12 right now and it's doing it. Mine squeals around 1 to 3 degrees pitch and on spool up. I would tell you to either up your headspeed or take it down a bit and see what that does.

Let us know how you work it out.

Tom

[Ticidytoc]

Is the motor shaft loose in the bearing ? I thought this might be causing it in the Z-power motors. I have heard other complain about this with the zpower and noticed the shaft is a bit loose in the inner sleeve of the bearing. maybe some locktite would help ?

One thing, my z-power never made noises in the trex 600, but it did in the eraptor, so it may be in the gear train of the erappy's.

[stevehonn]

I've used two brand new motors in my E550 and both do exactly the same. I've experimented with gear mesh and have found it a little quieter with a close mesh but obviously not binding.

I'd agree with Ticidytoc, it appears to be due to the gear train itself, maybe a combination of thegear sizes and tooth module.

[Steve Bryant]

I suspected the motor bearings first thing. I pulled the can off the z-power and noticed some fretting on the shaft where the bearing was not turning with the shaft. "Problem found" I thought, I secured the shaft to the bearing inner race with sleeve retaining compound. Still no joy. I broke it apart and glued the other bearing. That didn't help. Finally I extracted both bearings and replaced them. It is still screeching..........

Slowing the H/S down to around 1600, It has a noticable tail kick when the screeching starts and stops. Can anyone duplicate this condition as well?

Steve

[Steve Bryant]

I moved the Motor timing from low to High and the screeching noise went away completly. The next flight I moved it from high to standard timing and could just hear it start to screech in power on decent.

All I can figure is the ESC and the motor would lose time with each other when the motor was very lightly loaded.

Advance the timing and let me know if it helped.

Steve

[OICU812]

Weird I never heard that ever on my ERappy.

[HAV]

Just ran across this thread...other than timing has anyone come up with anything else. My R50V2 conversion with an Orbit 32-12 + Jazz 55 does the same thing with light loading. I have always assumed it was timing related but since it is transient and nothing has worn excessively, smoked or broken I have not looked aggressively for the cause. Just curious. HAV

[litespeed]

I run the same Orbit 30-12 with the CC85 and it screams at me at many different loads/rpms. I think the gears and body have something to do with the howling but not for sure.

Tom

[Ticidytoc]

I played with gear mesh the other day on the e-rappy, we made it a bit sloppy and that seemed to help. Doesnt squeal like it did when it was "properly meshed".

[HAV]

That's interesting....I'm using the R90 95T main gear and a Century 9T pinion. I'll loosen up the mesh next flight and see what it does. HAV

[Steve Bryant]

Its the timing and/or ESC switching.

Myself and a fellow flyer in Brazil have been at this for weeks. We have found that increasing the timing and or increasing the ESC switching frequency can eliminate the screeching.

Apparantly CC's fix for a motor overheating problem lowered the default switching frequency down into the range that humans can hear. When the right set of paramaters are achieved the ESC will screech audibly. When it does it, it sounds like a dry bearing spinning.

Steve

[Ticidytoc]

So then the Kontronik must be selecting the same freq. Interesting. Once the CC shows up I will play with that.

Wonder why the Jazz never had the same problem in the T600 with the Z-Power ?

[LITHIUMSTATIC]

Mine just started doing this too. Hummmm..... Not really bad just at 0-2 degrees pitch a little. IMHO I feel it's motor timing or switching frequency as Steve Bryant was saying. I will keep you guys posted as to what I find out.

[BarracudaHockey]

The last helicopter related screetching I heard was when my wife saw my last Heliproz reciept. :arggg:

[LITHIUMSTATIC]

The last helicopter related screetching I heard was when my wife saw my last Heliproz reciept. :arggg: :lolol

[theShark]

Has anyone found out the cause of the screeching? Mine is doing this but only in idle up 2 at high rpm and it really does sound like a bad bearing.

[LITHIUMSTATIC]

When i went to a 10s setup the problem went away on mine. I was using standard timing.

[528hemi]

I had the same issues with a z50-800 CC HV 85 esc....I had a ton of issues with the latest firmware and flashed back to 1.55 and all the screaching we nt away...I also change a bunch of other things including
using a TT pinion which ensures the shaft can not oscillate. I was told this does nto matter but did it anyway....I have no screeching anymore.

[Finless]

I have not had a screeching problem with a 10S setup, ripper motor, and CC85HV. I am now using the JETI/Hacker O-heli 77 and no problem there either (though the motor does run hotter with this ESC).

Bob

[henrik04]

With the Castle creation HV110A from http://www.infinity-hobby.com/main/product_info.php?cPath=36_41&products_id=230
on 12S (A123). Motor Z-50A 800. I did not had the mentioned noise.. I tried very low to fastest pump up possible..
So maybe it's just in a specific configuration?

[cgalavis]

I wonder if anyone came up with a definite cause and resolution for this issue. I am having something similar that what was described in some of the postings (bad bearing like noise in particular during fast pirouettes, almost as if something was loose).

Thanks a lot,
-Carlos

[Emile]

Hi guys,

I have 2 Raptors E620's ... their setup :

- 14s (A123) / Motor Z-50A 800 / Castle Creations 85HV / 9T Pinion
- 10s TP3850V2 / Motor Z-50A 800 / Castle Creations 85HV / 9T Pinion

When everything was brandnew both where SUPER silent, now every flight it gets worse.
On my 10 TP3850V2 heli i changed ALL bearings last weekend and the terrible noise kept the same.
I've not changed any settings on the Castle Creations since my first flight.
So everything that's left would be the Motor?

When i apply FULL pitch the noise is almost gone, but everything less then FULL PITCH ... makes a TERRIBLE noice.

I'm going to test a brandnew (loan) Motor Z-50A 800 next weekend to see if i'm right.

Will keep you posted about the result ...

Kind regards,
Emile

[Emile]

Well just dismounted the suspected Motor and checked the axis & bearings.

- the frontbearing feels OK
- the backbearing (inside of the motor) doesn't feal right
- the motoraxis shows slight slip wear ... but looks alright.

Will look for new bearings in the meantime ... hmz

What's the best way to remove the bearings from the motor without damaging it?
Heating an axis which is put inside the bearing?

Kind regards,
Emile

[henrik04]

Just an idea.. The belt pulleys .. Did you check them.. ? (Not saying it's the cause of your problem but never know.. :-) I intend to buy the metal ones from quick-uk. As tail is Kasama don't have plastic there..

Hope you'll find your problem.

Happy flying.