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Vbar evo unequal pirouette speed

geschrieben von benben 
Vbar evo unequal pirouette speed
08.09.2024 05:19:04
On my OMP M7 with neo evo pro rescue, the right pirouette speed is pretty normal at 128 but the left pirouette is extremely fast like there is no tail gyro. It there any parameter to adjust this strange behavior or is my unit broken?
RV
Re: Vbar evo unequal pirouette speed
08.09.2024 09:25:21
As the gyro works on both sides - having unequal speeds is a mechanical or aerodynamical problem.

Please post 2 images from birds eye view on the tail rotor (NOT fold blades), one in each endpoint.

Theory 1: Your rate of 128 is reached in the "faster" direction - the "slower" one produces too less thrust, might be too less throw, too less rpm, too short blades - and in rare cases also as stall effect (you will hear it).

Theory 2: Your rate 128 reached in the "slower" direction - the "faster" one has a issue with e.g. thrust bearings - or - with the tail slider itself locking in by straightening the connections (had this on some TT helis years ago).

To check out which Theory is the right one - lower the tail rate to e.g. 80 and see if the "faster" one slows down now or the "slower" one.

Also in both cases the tail linkage needs to be checked. I had also some bad glue joints there in the past.

Another thing - learned yesterday - a mate came up with a tail which doesn't pirouette right after 2 minutes of flight against the torque. We figured out that the tail servo was very hot. Changing fom 500Hz to 333Hz did not help - so the servo itself must be bad here. It was a "el cheapo" one with nice values on the factsheeht - but in real life it failed.

regards (EN) / Gruss (DE)

Rainer Vetter

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1 mal bearbeitet. Zuletzt am 08.09.2024 09:26 von RV.
Re: Vbar evo unequal pirouette speed
08.09.2024 09:52:52
Tail


Re: Vbar evo unequal pirouette speed
08.09.2024 09:58:05
Tail 2


Re: Vbar evo unequal pirouette speed
08.09.2024 10:02:49
I did slow the tail rate down but the faster non torque side still spins really fast like non gyro.
RV
Re: Vbar evo unequal pirouette speed
08.09.2024 10:19:50
Having a look at the blades - i guess we might have a stall effect in the "pirouetting CW" direction which leads into slowing down here. The angle in the first image seems probably too high. Could you please dial it down a bit and have a look if the pirouette is now faster in this one?

regards (EN) / Gruss (DE)

Rainer Vetter

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Posting and answering - please use a PC and a standard keyboard. Answer all questions fully, take the needed time, don't forget probably requested attachments.

Für Posts und Antworten bitte einen PC und eine richtige Taststaur benutzen sowie alle Fragen vollständig abarbeiten. Nehmt Euch Zeit, beantwortet Rückfragen in Ruhe und vollständig.
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Re: Vbar evo unequal pirouette speed
08.09.2024 11:03:09
pirouetting CW is perfectly fine
RV
Re: Vbar evo unequal pirouette speed
08.09.2024 14:57:01
What you can do to narrow it down whether it is a gyro or a heli issue:

Moun t the VBar upside down (and configure of course). If the issue stays - it is the heli. If it moves to the other side - the Gyro.

regards (EN) / Gruss (DE)

Rainer Vetter

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Posting and answering - please use a PC and a standard keyboard. Answer all questions fully, take the needed time, don't forget probably requested attachments.

Für Posts und Antworten bitte einen PC und eine richtige Taststaur benutzen sowie alle Fragen vollständig abarbeiten. Nehmt Euch Zeit, beantwortet Rückfragen in Ruhe und vollständig.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Für Einzelkommunikation bitte ausschließlich Email verwenden! - PN, Messenger, Chat usw. werden nicht bearbeitet.
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1 mal bearbeitet. Zuletzt am 08.09.2024 14:57 von RV.
Re: Vbar evo unequal pirouette speed
10.09.2024 18:01:39
Benben, are you sure you have installed the tail shaft in the correct orientation and it has not been installed backwards? If I recall the recent build I did of the OMP M7, the tail shaft almost looks symmetric. The distance between the hole and the end of the tail shaft is very slightly different on one end compared to the other (by 0.5mm), so care must be taken. It must not be eyeballed.
Re: Vbar evo unequal pirouette speed
12.09.2024 06:07:52
Even if I had the shaft installed wrong ? my ccw rotation at full left rudder shouldn’t be that fast.
Re: Vbar evo unequal pirouette speed
12.09.2024 06:15:11
I mean really really fast at full left rudder
RV
Re: Vbar evo unequal pirouette speed
12.09.2024 07:43:22
Quote:
What you can do to narrow it down whether it is a gyro or a heli issue:

Moun t the VBar upside down (and configure of course). If the issue stays - it is the heli. If it moves to the other side - the Gyro.

What is the result of this test?

regards (EN) / Gruss (DE)

Rainer Vetter

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Posting and answering - please use a PC and a standard keyboard. Answer all questions fully, take the needed time, don't forget probably requested attachments.

Für Posts und Antworten bitte einen PC und eine richtige Taststaur benutzen sowie alle Fragen vollständig abarbeiten. Nehmt Euch Zeit, beantwortet Rückfragen in Ruhe und vollständig.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Für Einzelkommunikation bitte ausschließlich Email verwenden! - PN, Messenger, Chat usw. werden nicht bearbeitet.
For single user communication please send a email only! PM, Messenger, Chat etc. won't be read.
Re: Vbar evo unequal pirouette speed
12.09.2024 09:17:56
I am waiting for the weekend
RV
Re: Vbar evo unequal pirouette speed
12.09.2024 09:24:28
thumbs up

regards (EN) / Gruss (DE)

Rainer Vetter

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Posting and answering - please use a PC and a standard keyboard. Answer all questions fully, take the needed time, don't forget probably requested attachments.

Für Posts und Antworten bitte einen PC und eine richtige Taststaur benutzen sowie alle Fragen vollständig abarbeiten. Nehmt Euch Zeit, beantwortet Rückfragen in Ruhe und vollständig.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Für Einzelkommunikation bitte ausschließlich Email verwenden! - PN, Messenger, Chat usw. werden nicht bearbeitet.
For single user communication please send a email only! PM, Messenger, Chat etc. won't be read.
Re: Vbar evo unequal pirouette speed
14.09.2024 09:55:24
After resetting the evo, the tail is behaving normal.
RV
Re: Vbar evo unequal pirouette speed
14.09.2024 17:29:12
Okay - is there a chance to have a look at the previous setup file? Did you store it somewhere? I would be curious ;-)

regards (EN) / Gruss (DE)

Rainer Vetter

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Posting and answering - please use a PC and a standard keyboard. Answer all questions fully, take the needed time, don't forget probably requested attachments.

Für Posts und Antworten bitte einen PC und eine richtige Taststaur benutzen sowie alle Fragen vollständig abarbeiten. Nehmt Euch Zeit, beantwortet Rückfragen in Ruhe und vollständig.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Für Einzelkommunikation bitte ausschließlich Email verwenden! - PN, Messenger, Chat usw. werden nicht bearbeitet.
For single user communication please send a email only! PM, Messenger, Chat etc. won't be read.
Re: Vbar evo unequal pirouette speed
15.09.2024 05:31:02
I used the same model setup file.
Re: Vbar evo unequal pirouette speed
15.10.2024 08:44:16
Well the problem came back. This time is even worst. The heli will not stop spinning even after I let go of the left rudder command. I removed the problematic EVO and installed a NEO and everything was fine. I guess is time to send it back to Mikado.
Re: Vbar evo unequal pirouette speed
21.10.2024 10:08:24
Hi,

I was out of office for one week and I'm doing forum first, today.
Did you already open a service ticket? If not, please do so, at vstabi.info/devices, or let me know, or I'll be on it soon anyway smiling smiley

Cheers

Eddi

Born to fly ...
forced to work.
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