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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › New JR8900G needed after every 30 flights
02-07-2010 07:20 PM  8 years agoPost 1
tommyvuitton

rrApprentice

Joburg, South Africa

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Can't figure out why after every 30 flights I need to replace my tail servo. I have been through 3 in 80 flights. I have for a while had an issue with the tail servo bouncing when the heli is idling. I have a 770 3D gyro and think that it might be the issue. Let me know your thoughts...

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02-07-2010 07:25 PM  8 years agoPost 2
Saint728

rrProfessor

Honolulu, Hawaii

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Need more information about your set up? What voltage are you running your tail servo at? Is it getting hot? Any binding?

Take Care,
Cheers, Patrick

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02-07-2010 07:50 PM  8 years agoPost 3
tommyvuitton

rrApprentice

Joburg, South Africa

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Hi Saint

I am running the 770 3D in high frame rate. The setup is silky smooth and there aren't any servos that are binding.

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02-07-2010 08:07 PM  8 years agoPost 4
Saint728

rrProfessor

Honolulu, Hawaii

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I would check the voltage to your tail servo and see if your regulator is delivering the proper amount? That servo is suppose to be used at 4.8V only. I would think 5.2V's would be all right too, but any more then that could burn out the servo really fast.

Take Care,
Cheers, Patrick

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02-07-2010 08:36 PM  8 years agoPost 5
Heli 770

rrProfessor

USA.

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Sounds like you're running the gyro and servo on 6 volts.
Edit: are you using the 5.2v output for the tail servo?

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02-07-2010 11:57 PM  8 years agoPost 6
9387ASH

rrElite Veteran

UK

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You say that the setup is correct, one thing I found is that the servo/gyro can be trying to compensate for tail vibration. Try flying the heli without a gyro and see what happens.

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02-08-2010 04:20 AM  8 years agoPost 7
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi

You possibly have the gain a little too high and the servo is rapidly hunting, but not high enough to cause a visible wag.

Try reducing the gyro gain a little and see the if it still has a strong hold.

Regards
Paul

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02-08-2010 04:39 PM  8 years agoPost 8
tommyvuitton

rrApprentice

Joburg, South Africa

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Saint: I am running the Reactor X and it pushes out 5.2V & 5.0A to the receiver. I have selected the 6.8V but that is on a different output intended for the swash servos.

Heli: I have made sure on the wiring for Reactor.

9387: Are you serious??!?!

pwood: I am going to try drop the gain a little and see if i can make it hold.

Thanks for the replys.

Tommy

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02-08-2010 05:53 PM  8 years agoPost 9
Saint728

rrProfessor

Honolulu, Hawaii

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Saint: I am running the Reactor X and it pushes out 5.2V & 5.0A to the receiver. I have selected the 6.8V but that is on a different output intended for the swash servos.
Just make sure your Reactor X is actually giving you 5.2V's on your tail servo. Check with a multimeter while testing. I've seen a couple of these giving out a lot more then its suppose to.

Take Care,
Cheers, Patrick

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02-08-2010 07:59 PM  8 years agoPost 10
TankDirt

rrKey Veteran

Illinois

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I am running the 770 3D in high frame rate.
I dont belive the 8900g is a high frame rate servo. Correct me if im wrong.

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02-08-2010 09:26 PM  8 years agoPost 11
9387ASH

rrElite Veteran

UK

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You are wrong and therefore corrected !

And yes I am serious. If it set up 100% mechanically, then you wont have too much problem in the hover.

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02-09-2010 11:45 AM  8 years agoPost 12
tommyvuitton

rrApprentice

Joburg, South Africa

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Think i have found my problem..

The output of the ReactorX which goes to the receiver is pushing out 5.2V and i just checked the specs on the DS8900G and its supposed to be run at nothing more than 4.8V. Stupid error on my part.

Thanks allot for the help guys.

Now that i think of it, ive only had issues with the tail since i changed to the ReactorX.

So, only thing to do is get a step down for the gyro and another DS8900G...

One last question: where do i put the step down in between? The rx and gyro or gyro and tail servo?

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02-09-2010 11:53 AM  8 years agoPost 13
Heliguychris

rrKey Veteran

Perth, West Australia

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Dude, that may not be the problem.

Hundreds of flights on various 8900g`s on 6v. Not a drama. It says ya not sposed too, but they certainly dont consistantly burn out in 30 flights.....theres no chance its getting 6.8 v from the reg by accident ? 8v will kill em fast

938ASH ......dude, do ya seriously recon thats the best way to work the problem LMAO ......got a vid of you doing it ?

Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au

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02-09-2010 12:04 PM  8 years agoPost 14
tommyvuitton

rrApprentice

Joburg, South Africa

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Suppose switching the gyro out of high frame rate would make buying the stepdown a waste...

Thanks again guys!

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02-09-2010 12:22 PM  8 years agoPost 15
Heli 770

rrProfessor

USA.

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tommyuitton
The step down should go between gyro and tail servo. The 5.2 volts input to your tail servo is not a problem. Think about it, a fully charged Nicad Rx pack will give 5.2 volts. Most step downs are to reduce 6 volts to 5.1-5.2 volts(.7-.8 volts drop).

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02-09-2010 12:33 PM  8 years agoPost 16
tommyvuitton

rrApprentice

Joburg, South Africa

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Heli 770: I hear you with the nicad packs but i am running 2S Lipos. I do have the Align step down. Will that work?

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02-09-2010 12:42 PM  8 years agoPost 17
Heli 770

rrProfessor

USA.

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You tested the Reactor output and it gave you 5.2 volts, the Align is going to give you 5.1 volts, not much of a difference. I don't think you have a voltage issue.

Edit: If you use the Align step down with your 5.2 volts input, it's going to drop the voltage to 4.5 volts and keep dropping the voltage .7-.8 volts as your Rx batt. drops in voltage.

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02-09-2010 01:13 PM  8 years agoPost 18
Canadian Man

rrNovice

Calgary, Ab, CANADA

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High frame rate keeps being brought up. I have a JR7703d gyro and dont remember a frame rate option on the gyro? Am I missing something here?

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02-09-2010 01:19 PM  8 years agoPost 19
tommyvuitton

rrApprentice

Joburg, South Africa

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Sorry, i was actually talking about the Servo Output Switch on the gyro. It has a "High" & "Low" switch.

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02-09-2010 01:42 PM  8 years agoPost 20
Heli 770

rrProfessor

USA.

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I would try moving the servo ball one hole out and reduce the gain.

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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › New JR8900G needed after every 30 flights
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